{include:Teesworks - keywords - menu} [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001057-NZT DCO 6.4.1 ES Vol III Appendix 1A EIA Scoping Report Part 1.pdf|EN010103-001057-NZT DCO 6.4.1 ES Vol III Appendix 1A EIA Scoping Report Part 1.pdf]]:48: contamination hotspots or plumes, quantitative risk assessment, remediation and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001057-NZT DCO 6.4.1 ES Vol III Appendix 1A EIA Scoping Report Part 1.pdf|EN010103-001057-NZT DCO 6.4.1 ES Vol III Appendix 1A EIA Scoping Report Part 1.pdf]]:70:  visible emissions, for example smoke or visible plumes. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002421-NZT DCO 9.42 - Comments on D9 Submissions & Additional Submissions - Oct 2022 (D11).pdf|EN010103-002421-NZT DCO 9.42 - Comments on D9 Submissions & Additional Submissions - Oct 2022 (D11).pdf]]:42: scenario, less than 10% of the plume could potentially be located in a limited area [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002421-NZT DCO 9.42 - Comments on D9 Submissions & Additional Submissions - Oct 2022 (D11).pdf|EN010103-002421-NZT DCO 9.42 - Comments on D9 Submissions & Additional Submissions - Oct 2022 (D11).pdf]]:42: located away from the CO2 plume would not need to be considered. As a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002421-NZT DCO 9.42 - Comments on D9 Submissions & Additional Submissions - Oct 2022 (D11).pdf|EN010103-002421-NZT DCO 9.42 - Comments on D9 Submissions & Additional Submissions - Oct 2022 (D11).pdf]]:42: those reasons, even allowing for the potential for some small part of the plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf|EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf]]:50: always met within a few metres of the outfall and before the plume meets the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf|EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf]]:52: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf|EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf]]:52: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf|EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf]]:52: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf|EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf]]:97: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf|EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf]]:97: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf|EN010103-002552-NZT DCO 5.13 - HRA Report (Clean) - Nov 2022 (D12) (1).pdf]]:98: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf|EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf]]:54: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf|EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf]]:54: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf|EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf]]:54: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf|EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf]]:97: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf|EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf]]:97: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf|EN010103-002258-NZT DCO - 5.13 - HRA (Tracked) - Sept 2022(D8).pdf]]:98: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002323-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Tracked Oct 2022 (D9).pdf|EN010103-002323-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Tracked Oct 2022 (D9).pdf]]:23:system scenarios (i.e. alternative outfall) the effluent plume may neutral emission). The effluent [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002323-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Tracked Oct 2022 (D9).pdf|EN010103-002323-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Tracked Oct 2022 (D9).pdf]]:27:system scenarios (i.e. alternative outfall) the effluent plume may be discharged (i.e. this is a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf|EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf]]:38:plumes from 24 septic systems. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf|EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf]]:39:distance any P plume extends. Calcareous sediments having very high P retention (average [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf|EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf]]:39:97%), with plumes not extending beyond 10m and non-calcareous sediments showing [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf|EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf]]:39:greater variability and having a lower P retention (average 69%) with some of the P plumes [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf|EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf]]:40:NECR222). Robertson et al (2019) also found that the majority (although not all) of plumes did not extend further [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf|EN010103-001667-Natural England - Written Representations (WRs), including summaries of all WRs exceeding 1500 words.pdf]]:40:Robertson et al (2019) found a plume to extend which was 100m to ensure there would be no overlap. It also [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001582-NZT DCO 5.3 - Planning Statement - May 2022 (Tracked).pdf|EN010103-001582-NZT DCO 5.3 - Planning Statement - May 2022 (Tracked).pdf]]:234: structure (including any associated emission plume) after mitigation. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002069-NZT DCO 8.5 - Environment Agency SoCG (Tracked) August 2-22 (D6).pdf|EN010103-002069-NZT DCO 8.5 - Environment Agency SoCG (Tracked) August 2-22 (D6).pdf]]:11: plume impacts, emissions to air and the emerging BAT [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:23:with the water effluent plume from effluent containing noted that there is no WFD classification available for nitrogen [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:24:sediment plumes need to be taken into account in the Screening stage (see paragraph 9.5.6 and Table 9C-10). At [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:24: sediment plumes, and this is considered in Table 9C-15 (Tees [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:24: Potential impacts from a thermal/sediment plume scoped into [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:24: plumes have taken consideration of the spatial area of impact [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:55: the potential for an effluent plume from the proposed discharge of cooling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:59: physical disturbance and changes in water quality (e.g. a sediment plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:59: outfall causing thermal plumes or chemical changes in water quality including [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:59: effluent plumes: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:60: assessment on account of the potential sediment, chemical or thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:60: chemical effluent plume may be larger and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:60: sediment plume risks has been undertaken, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:60: sediment plume during construction could [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:60: exceed 0.5 km2. Modelling of thermal plumes [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:60: phase and indicates potential for a plume to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:60: chemical effluent plume may be larger and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:60: within the ZoI of the DIN effluent plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:61: operational impacts such as the release of a thermal plume from process [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:61:change in depth or discharge plume or pollutants in [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:64:Biology: Habitats Habitats and benthic Potential temporary sediment plume during [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:64: invertebrates construction or thermal/chemical plume during [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:64: of nitrogen from the proposed new outfall may create a plume that would [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:66: plume that would slightly enter the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:66: plume (for DIN) to enter the mouth of the estuary, at depth within the dredged [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:67: noting that this also includes the footprint of thermal or sediment plumes: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:67: sediment plume being produced by the installation and removal of the coffer [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:68:0.5 km2 or ✓ ✓ Any plume relating to runoff laden with fine [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:68:1% or more of ✓ ✓ Any plume relating to runoff laden with fine [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:68: DIN effluent plume from the new outfall location. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:68: these habitat areas. plume relating to runoff [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:70: conditions, and at depth (i.e. not at the surface; plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:82: sediment plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:82:9.7.51 However, it is considered that any sediment plume arising from this [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:82: and mammals are able to avoid the plume. Furthermore, the relatively [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:83: scale and any sediment plume would be very quickly dispersed by the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:98:9.7.135 Mixing zone plumes in CORMIX are modelled over different stages; the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:98: rising stage) and the later period of mixing when the plume reaches the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:98: by diffusion of the plume into the large ambient water volume. Further details [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:99: Results of near-field thermal plume modelling undertaken using the CORMIX [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:99: extent of a thermal plume (with a 15°C excess temperature at source) would [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:99: temperature excess, the ebb extent of the plume increases to 140m. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:99: plume dispersion appear to occur very rapidly from the origin with very little [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:99: rates of dissipation of the outfall plume, the neap tidal phases offer a larger [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:99: plume, with the 2°C contour extending 600 m and 400 m from the outfall on [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:99: extent of the thermal plume and the apparent degree of mixing, it is unlikely [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:100: habitats and associated communities within the footprint of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:100: between the small thermal plume and intertidal habitats and so the magnitude [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:100: thermal plume has been shown to be very localised, and The extent of the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:100: thermal plume within the water column will be highly localised, with a small [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:100: water) and therefore the footprint of the thermal plume on the seabed will [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:100: such as sandeels) to the thermal plume is unlikely to result in changes to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:100: communities in terms of abundance and diversity. The thermal plume is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:101: establishment of non-natives linked to the thermal plume is therefore [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:104: plume rising stage for low tide, high tide and maximum current conditions. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:120: levels within the Tees Bay. A smaller area within the wider plume will exceed [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:177:concentrations are diluted to below the EQS. Mixing zone plumes in CORMIX are modelled over [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:177:period of mixing when the plume reaches the water surface and spreads laterally (the surface spreading [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:177:while dilution during the surface spreading stage is more dominated by diffusion of the plume into the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:177:zone plumes in different ways depending on the current conditions specified: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:177: pair of ports and resolve the dimensions of the resulting three individual plumes (Figure 4-2). [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:178: resolve individual mixing plumes for each pair of outfalls, although the plumes are significantly [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:178: of each plume and for the surface spreading stage. The plumes combine and become vertically [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:178: 0.271 m/s respectively) the plumes undergo rapid lateral mixing at the point of discharge. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:178: CORMIX represents this by combining the plumes into a single mixing zone for both the vertical [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:178:mixing plume above the outfall, the lateral distance travelled by the plume and the cross section width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:178:of the mixing zone plume at the point when the EQS is reached. If the EQS is met in the surface [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:179:plume rising stage. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:179: Plume Cross Section Width 1.9 0.5 1.0 0.6 0.9 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:179: Plume Cross Section Width 15 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:179: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:179: Plume Cross Section Width 1.8 0.4 0.5 0.3 0.5 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:179: Plume Cross Section Width 1.9 0.5 1.0 0.4 0.3 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:179: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:179: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:179: Plume Cross Section Width 1.8 0.4 0.8 0.3 0.3 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:179:The results in Table 4-3 show that EQS values for all substances are met within the plume rising stage [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:180:scenario is 0.34 m/s and the EQS for all substances are met during the plume rising stage. Results are [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:181: Plume Cross Section Width 0.6 discharge 0.7 0.6 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:181: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:181: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:181: Plume Cross Section Width 0.6 discharge 0.7 0.6 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:181: Plume Cross Section Width 0.6 discharge 0.7 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:181: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:181: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:181: Plume Cross Section Width 0.6 discharge 0.7 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:190:plume reaches the water surface. Thermal effects are also extremely small, with the temperature of the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf|EN010103-002424-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Tracked).pdf]]:190:mixing plume falling below 3°C above ambient conditions within a very short distance. Surface [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001246-EA_NZT_OFFICIAL_171221_Redacted.pdf|EN010103-001246-EA_NZT_OFFICIAL_171221_Redacted.pdf]]:2:with the water effluent plume from effluent containing Nitrogen to the Tees bay [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001246-EA_NZT_OFFICIAL_171221_Redacted.pdf|EN010103-001246-EA_NZT_OFFICIAL_171221_Redacted.pdf]]:20:plume may prohibit upstream movement. Therefore, there is a potential for [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001586-NZT DCO 8.4 - MMO SoCG - May 2022.pdf|EN010103-001586-NZT DCO 8.4 - MMO SoCG - May 2022.pdf]]:25: preliminary prediction that any “plume” would quickly dissipate and is likely to be ecological [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001652-Climate Emergency Policy and Planning - Written Representations.pdf|EN010103-001652-Climate Emergency Policy and Planning - Written Representations.pdf]]:137:available to assess with more precision the behaviour of the CO2 plume in the storage [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:21:system scenarios (i.e. alternative outfall) the effluent plume may neutral emission). The effluent [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:33:Figure 4-2: Deflected Lateral Plume Mixing Zone................................................................................ 22 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:50:that the mixing zone plume can take two different shapes depending on the current flow rate compared [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:50:to the discharge velocity; the plume either forms a vertical mixing zone extending towards the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:50:surface or a lateral plume extending along the direction of the current. The two plume shapes are shown [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:50:the vertical thickness of the plume. These dimensions will be quoted in Section 5 to show the size of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:50:If a vertically rising plume reaches the water surface, then the effluent will spread horizontally at the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:50:plume begins to spread at the surface level. The lateral extent of the surface mixing zone can become [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:50:large under this scenario, although the vertical rising plume thickness remains small. The extent of any [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:51: Figure 4-2: Deflected Lateral Plume Mixing Zone [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:52: Description of Plume Distance from outfall to reaching EQS [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:52: Plume is deflected horizontally a = 1.8 m a = 0.9 m a = 1.3 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:52: Min Plume rises vertically but does a = 0.12 m a = 0.03 m a = 0.05 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:52: Plume is deflected horizontally a = 1.2 m a = 0.9 m a = 1.2 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:52: Min Plume rises vertically but does a = 0.05 m a = 0.03 m a = 0.05 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:52: High Tide Plume rises vertically and only b = 2.6 m b = 1.6 m b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:52: Plume rises vertically but does b = 2.0 m b = 0.3 m b = 2.3 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:53: High Tide Plume rises vertically and b = 3.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:53: High Tide Plume rises vertically and b = 2.0 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:53:always met within a few metres of the outfall and before the plume meets the water surface. A thermal [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:53: Description of Plume Distance from outfall to reaching EQS [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:53: Plume is deflected horizontally [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:54: Plume is deflected horizontally a = 1.2 m a = 0.8 m a = 1.2 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:54: Min Plume rises vertically but does a = 0.05 m a = 0.03 m a = 0.05 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:54: High Tide Plume rises vertically and only b = 2.6 m b = 1.6 m b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:54: Plume rises vertically but does b = 1.7 m b = 1.6 m b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:54: High Tide Plume rises vertically and b = 3.1 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:54: Plume rises vertically but does b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:54:always met within a few meters of the outfall and before the plume meets the water surface. A thermal [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:64:the EQS within a very short distance of the outfall and before the mixing plume reaches the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:64:surface. Thermal effects are also extremely small, with the temperature of the mixing plume falling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:64:below 3°C above ambient condition within a very short distance and usually before the plume reaches [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:74:Results of near-field thermal plume modelling undertaken using the CORMIX modelling software show [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:74:that, for Outfall 1 under spring conditions, the likely extent of a thermal plume (with a 15°C excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:74:extent of the plume increases to 140 m. Considering a further reduced excess temperature shows that [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:74:and 720 m on an ebb. In all cases tested, the mixing and plume dispersion appear to occur very rapidly [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:74:outfall plume, the neap tidal phases offer a larger plume, with the 2°C contour extending 600 m and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:74:Far field plume dispersion modelling using the Delft3D model shows a small impact of outfall discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:75: 1.1 Near-field thermal plume modelling ..................................................................................................2 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:75: 1.2 Far-field thermal plume modelling ......................................................................................................2 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:76:Table 10. Thermal plume properties in Delft3D, summer and winter case .......................................... 17 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:76:Figure 14. Spring and neap flood tide plume variations during normal discharge events. ............ 13 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:76:Figure 15. Spring and neap ebb tide plume variations during normal discharge events. ............... 14 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:79:Figure 82. Spring and neap flood tide plume variations during extreme discharge events. .......... 91 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:79:Figure 83. Spring and neap ebb tide plume variations during normal discharge events. ............... 92 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:80:AECOM Ltd. have commissioned ABPmer to undertake hydrodynamic and thermal plume modelling of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:82:  Near-field thermal plume modelling at two different outfall locations; and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:82:  Far-field 3D thermal plume modelling. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:82:1.1 Near-field thermal plume modelling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:82:model to construct thermal plume simulations using the MixZon Inc. CORMIX modelling software. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:82:quantify the possible extent of a plume from both outfall locations with particular thermal properties. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:82:1.2 Far-field thermal plume modelling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:82:Section 2: CORMIX Modelling – Outfall 1: Provides details of the thermal plume model setup and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:82:Section 3: CORMIX Modelling – Outfall 2: Provides details of the updated thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:84:CORMIX thermal plume modelling, as described in the following sections. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:87:flood and ebb conditions as in Table 1) and shows the ebb plume (Run 10) to better maintain its excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:87:Shown in Figure 7 is the plume sensitivity to winds. The summer wind value of 4.08 m/s is a light wind [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:87:and doesn’t appear to have any influence on the plume when comparing runs 01 and 03. When a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:87:significantly stronger wind of 15 m/s is applied (Run 16), the plume is slightly affected causing the excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:88:Figure 8 shows the tests addressing the plume sensitivity to the discharge port diameter. The baseline [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:88:Figure 9 shows the plume sensitivity to projection of the outfall port. Run 01 has a vertical projection [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:91:As stated in Section 2, CORMIX modelling, assessing the near-field impact of the of thermal plume has [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:103:In order to test the sensitivity of the plume discharge to wind directions, two further simulations have [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:103: differences in the distribution of the thermal plume: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:103:  When a south easterly (120°) wind is applied to the summer thermal plume discharge scenario [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:103: the effect is to reduce the eastern extent of the thermal plume. This is more pronounced in the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:103: neap comparisons where flow speeds are lower and the along-coast extent of the plume is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:108:the Outfall 1 site are consistently higher which may be contributing to faster dispersion of the plume as [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:108:This plot shows the along shore flow directing the plume discharge into the estuary. Plot Figure 29 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:Near-field thermal plume modelling has been undertaken using the CORMIX modelling software to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:conditions, the likely extent of a thermal plume (of the properties modelled) would be very localised: a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:m on the ebb. Considering a 2°C temperature excess the ebb extent of the plume increases to 140 m, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:To examine the wider plume dispersion a 0.1°C temperature excess contour was exported from CORMIX. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:allow the plume to stay buoyant for longer, however the excursion from the plume would be limited by [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:Sensitivity testing showed only a small influence on plume extent due to wind and seasonal variations, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:the plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:outfall plume, the neap tidal phases offer a larger plume, when compared to the spring tide, under [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:normal discharge conditions. In particular, the neap flood tide offers the largest plume extent as [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:However, it is to be noted that the CORMIX model assumes full plume development under the given [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:enough for a fully developed plume (as defined) to form. As the flows reduce, either side of the peak [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:conditions modelled, and turn with the tidal phase, further dissipation of the plume is expected before [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:Far field plume dispersion modelling has been undertaken using the Delft3D modelling software using [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:116:Temperature excess plots of the plume impact have shown a small impact of the outfall discharge on [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:123:thermal plume or contamination modelling. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:171:Figure 82 shows the downstream temperature excess of the resultant plume during a spring (run 26) [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:171:characteristics again result in a more extensive plume, reducing the excess temperature at a slower rate [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf|EN010103-002248-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper - Sept 2022(D8).pdf]]:171:Figure 82. Spring and neap flood tide plume variations during extreme discharge events. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001587-NZT DCO 8.5 - Environment Agency SoCG - May 2022.pdf|EN010103-001587-NZT DCO 8.5 - Environment Agency SoCG - May 2022.pdf]]:11: themes of power generation, cooling, visible plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:52: disturbance and changes in water quality (e.g. a sediment plume relating to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:52: causing thermal plumes or chemical changes in water quality and deposition [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:52: noting that this also includes the footprint of thermal or sediment plumes: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:53: on account of the potential sediment or thermal plume to be produced by the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:53:larger sediment plume risks has been undertaken, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:53: plume during construction could exceed 0.5 km2. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:53: Modelling of thermal plumes has been [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:53: indicates potential for a plume to exceed 0.5 km2. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:53: operational impacts such as the release of a thermal plume from process [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:54:change in depth or flow) release of a thermal discharge plume or [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:55:Biology: Habitats Habitats and benthic Potential temporary sediment plume during [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:55: invertebrates construction or thermal plume during operation. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:58: noting that this also includes the footprint of thermal or sediment plumes: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:58: sediment plume being produced by the installation and removal of the coffer [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:59:0.5 km2 or larger ✓ Any plume relating to runoff laden with fine [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:59:1% or more of the ✓ Any plume relating to runoff laden with fine [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:59:1% or more of any ✓ Any plume relating to runoff laden with fine [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:71: cause an oxygen demand within the sediment plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:71:9.7.39 However, it is considered that any sediment plume arising from this [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:71: and mammals are able to avoid the plume. Furthermore, the relatively [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:71: scale and any sediment plume would be very quickly dispersed by the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:86:9.7.120 Results of near-field thermal plume modelling undertaken using the CORMIX [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:86: extent of a thermal plume (with a 15°C excess temperature at source) would [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:86: temperature excess, the ebb extent of the plume increases to 140m. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:86: plume dispersion appear to occur very rapidly from the origin with very little [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:86: rates of dissipation of the outfall plume, the neap tidal phases offer a larger [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:86: plume, with the 2°C contour extending 600 m and 400 m from the outfall on [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:86: plume and the apparent degree of mixing, it is unlikely that the planktonic [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:86: habitats and associated communities within the footprint of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:86: between the thermal plume and intertidal habitats and so the magnitude of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:87: the thermal plume within the water column will be highly localised, with a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:87: density of warmer water) and therefore the footprint of the thermal plume on [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:87: such as sandeels) to the thermal plume is unlikely to result in changes to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:87: communities in terms of abundance and diversity. The thermal plume is also [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf|EN010103-001064-NZT DCO 6.4.11 ES Vol III Appendix 9C WFD Assessment.pdf]]:87: establishment of non-natives linked to the thermal plume is therefore [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf|EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf]]:166: and sediments and the historical industrial input  26.08.20 - review of responses to Stage 2 thermal and chemical plume Report; and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf|EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf]]:167: predict plume behaviour from the outfall. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf|EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf]]:681: and visible vapour plumes; [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf|EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf]]:685:5.2 We also note the statement that the stacks will not give rise to any visible plumes (due to water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf|EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf]]:685: towers could result in occasional visible plumes during certain weather conditions. It is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf|EN010103-001152-NZT DCO 5.1 - Consultation Report.pdf]]:685: explained that, to address this, an assessment of visible plume formation will be undertaken to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002238-NZT DCO 8.5 - SoCG - Environment Agency September (Tracked) 2022 (D8).pdf|EN010103-002238-NZT DCO 8.5 - SoCG - Environment Agency September (Tracked) 2022 (D8).pdf]]:11: plume impacts, emissions to air and the emerging BAT [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000891-NZT DCO 6.2.5 ES Vol I Chapter 5 Construction Programme and Management.pdf|EN010103-000891-NZT DCO 6.2.5 ES Vol I Chapter 5 Construction Programme and Management.pdf]]:13: dissipation of any plume, a diffuser at the outfall head will be retrofitted if the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001683-Marine Management Organisation - Responses to the ExA’s ExQ1.pdf|EN010103-001683-Marine Management Organisation - Responses to the ExA’s ExQ1.pdf]]:20: ii) What consequences would this have for the visibility of the plume? [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002312-NZT DCO 6.4.49 - ES Vol III Appendix 25A Commitments Register Tracked Oct 2022 (D9).pdf|EN010103-002312-NZT DCO 6.4.49 - ES Vol III Appendix 25A Commitments Register Tracked Oct 2022 (D9).pdf]]:12: volumes and to assist the dissipation of any plume a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:23:system scenarios (i.e. alternative outfall) the effluent plume may neutral emission). The effluent [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:27:system scenarios (i.e. alternative outfall) the effluent plume may be discharged (i.e. this is a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:44:Figure 4-2: Deflected Lateral Plume Mixing Zone................................................................................ 22 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:61:that the mixing zone plume can take two different shapes depending on the current flow rate compared [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:61:to the discharge velocity; the plume either forms a vertical mixing zone extending towards the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:61:surface or a lateral plume extending along the direction of the current. The two plume shapes are shown [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:61:the vertical thickness of the plume. These dimensions will be quoted in Section 5 to show the size of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:61:If a vertically rising plume reaches the water surface, then the effluent will spread horizontally at the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:61:plume begins to spread at the surface level. The lateral extent of the surface mixing zone can become [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:61:large under this scenario, although the vertical rising plume thickness remains small. The extent of any [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:62: Figure 4-2: Deflected Lateral Plume Mixing Zone [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:63: Description of Plume Distance from outfall to reaching EQS [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:63: Plume is deflected horizontally a = 1.8 m a = 0.9 m a = 1.3 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:63: Min Plume rises vertically but does a = 0.12 m a = 0.03 m a = 0.05 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:63: Plume is deflected horizontally a = 1.2 m a = 0.9 m a = 1.2 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:63: Min Plume rises vertically but does a = 0.05 m a = 0.03 m a = 0.05 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:63: High Tide Plume rises vertically and only b = 2.6 m b = 1.6 m b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:63: Plume rises vertically but does b = 2.0 m b = 0.3 m b = 2.3 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:64: High Tide Plume rises vertically and b = 3.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:64: High Tide Plume rises vertically and b = 2.0 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:64:always met within a few metres of the outfall and before the plume meets the water surface. A thermal [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:64: Description of Plume Distance from outfall to reaching EQS [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:64: Plume is deflected horizontally [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:65: Plume is deflected horizontally a = 1.2 m a = 0.8 m a = 1.2 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:65: Min Plume rises vertically but does a = 0.05 m a = 0.03 m a = 0.05 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:65: High Tide Plume rises vertically and only b = 2.6 m b = 1.6 m b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:65: Plume rises vertically but does b = 1.7 m b = 1.6 m b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:65: High Tide Plume rises vertically and b = 3.1 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:65: Plume rises vertically but does b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:65:always met within a few meters of the outfall and before the plume meets the water surface. A thermal [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:75:the EQS within a very short distance of the outfall and before the mixing plume reaches the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:75:surface. Thermal effects are also extremely small, with the temperature of the mixing plume falling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:75:below 3°C above ambient condition within a very short distance and usually before the plume reaches [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:85:Results of near-field thermal plume modelling undertaken using the CORMIX modelling software show [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:85:that, for Outfall 1 under spring conditions, the likely extent of a thermal plume (with a 15°C excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:85:extent of the plume increases to 140 m. Considering a further reduced excess temperature shows that [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:85:and 720 m on an ebb. In all cases tested, the mixing and plume dispersion appear to occur very rapidly [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:85:outfall plume, the neap tidal phases offer a larger plume, with the 2°C contour extending 600 m and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:85:Far field plume dispersion modelling using the Delft3D model shows a small impact of outfall discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:86: 1.1 Near-field thermal plume modelling ..................................................................................................2 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:86: 1.2 Far-field thermal plume modelling ......................................................................................................2 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:87:Table 10. Thermal plume properties in Delft3D, summer and winter case .......................................... 17 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:87:Figure 14. Spring and neap flood tide plume variations during normal discharge events. ............ 13 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:87:Figure 15. Spring and neap ebb tide plume variations during normal discharge events. ............... 14 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:90:Figure 82. Spring and neap flood tide plume variations during extreme discharge events. .......... 91 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:90:Figure 83. Spring and neap ebb tide plume variations during normal discharge events. ............... 92 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:91:AECOM Ltd. have commissioned ABPmer to undertake hydrodynamic and thermal plume modelling of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:93:  Near-field thermal plume modelling at two different outfall locations; and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:93:  Far-field 3D thermal plume modelling. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:93:1.1 Near-field thermal plume modelling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:93:model to construct thermal plume simulations using the MixZon Inc. CORMIX modelling software. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:93:quantify the possible extent of a plume from both outfall locations with particular thermal properties. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:93:1.2 Far-field thermal plume modelling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:93:Section 2: CORMIX Modelling – Outfall 1: Provides details of the thermal plume model setup and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:93:Section 3: CORMIX Modelling – Outfall 2: Provides details of the updated thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:95:CORMIX thermal plume modelling, as described in the following sections. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:98:flood and ebb conditions as in Table 1) and shows the ebb plume (Run 10) to better maintain its excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:98:Shown in Figure 7 is the plume sensitivity to winds. The summer wind value of 4.08 m/s is a light wind [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:98:and doesn’t appear to have any influence on the plume when comparing runs 01 and 03. When a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:98:significantly stronger wind of 15 m/s is applied (Run 16), the plume is slightly affected causing the excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:99:Figure 8 shows the tests addressing the plume sensitivity to the discharge port diameter. The baseline [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:99:Figure 9 shows the plume sensitivity to projection of the outfall port. Run 01 has a vertical projection [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:102:As stated in Section 2, CORMIX modelling, assessing the near-field impact of the of thermal plume has [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:114:In order to test the sensitivity of the plume discharge to wind directions, two further simulations have [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:114: differences in the distribution of the thermal plume: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:114:  When a south easterly (120°) wind is applied to the summer thermal plume discharge scenario [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:114: the effect is to reduce the eastern extent of the thermal plume. This is more pronounced in the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:114: neap comparisons where flow speeds are lower and the along-coast extent of the plume is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:119:the Outfall 1 site are consistently higher which may be contributing to faster dispersion of the plume as [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:119:This plot shows the along shore flow directing the plume discharge into the estuary. Plot Figure 29 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:Near-field thermal plume modelling has been undertaken using the CORMIX modelling software to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:conditions, the likely extent of a thermal plume (of the properties modelled) would be very localised: a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:m on the ebb. Considering a 2°C temperature excess the ebb extent of the plume increases to 140 m, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:To examine the wider plume dispersion a 0.1°C temperature excess contour was exported from CORMIX. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:allow the plume to stay buoyant for longer, however the excursion from the plume would be limited by [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:Sensitivity testing showed only a small influence on plume extent due to wind and seasonal variations, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:the plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:outfall plume, the neap tidal phases offer a larger plume, when compared to the spring tide, under [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:normal discharge conditions. In particular, the neap flood tide offers the largest plume extent as [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:However, it is to be noted that the CORMIX model assumes full plume development under the given [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:enough for a fully developed plume (as defined) to form. As the flows reduce, either side of the peak [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:conditions modelled, and turn with the tidal phase, further dissipation of the plume is expected before [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:Far field plume dispersion modelling has been undertaken using the Delft3D modelling software using [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:127:Temperature excess plots of the plume impact have shown a small impact of the outfall discharge on [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:134:thermal plume or contamination modelling. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:182:Figure 82 shows the downstream temperature excess of the resultant plume during a spring (run 26) [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:182:characteristics again result in a more extensive plume, reducing the excess temperature at a slower rate [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:182:Figure 82. Spring and neap flood tide plume variations during extreme discharge events. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:214:concentrations are diluted to below the EQS. Mixing zone plumes in CORMIX are modelled over [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:214:period of mixing when the plume reaches the water surface and spreads laterally (the surface spreading [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:214:while dilution during the surface spreading stage is more dominated by diffusion of the plume into the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:214:zone plumes in different ways depending on the current conditions specified: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:214: pair of ports and resolve the dimensions of the resulting three individual plumes (Figure 4-2). [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:215: resolve individual mixing plumes for each pair of outfalls, although the plumes are significantly [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:215: of each plume and for the surface spreading stage. The plumes combine and become vertically [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:215: 0.271 m/s respectively) the plumes undergo rapid lateral mixing at the point of discharge. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:215: CORMIX represents this by combining the plumes into a single mixing zone for both the vertical [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:215:mixing plume above the outfall, the lateral distance travelled by the plume and the cross section width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:215:of the mixing zone plume at the point when the EQS is reached. If the EQS is met in the surface [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:216:plume rising stage. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:216: Plume Cross Section Width 1.9 0.5 1.0 0.6 0.9 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:216: Plume Cross Section Width 15 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:216: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:216: Plume Cross Section Width 1.8 0.4 0.5 0.3 0.5 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:216: Plume Cross Section Width 1.9 0.5 1.0 0.4 0.3 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:216: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:216: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:216: Plume Cross Section Width 1.8 0.4 0.8 0.3 0.3 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:216:The results in Table 4-3 show that EQS values for all substances are met within the plume rising stage [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:217:scenario is 0.34 m/s and the EQS for all substances are met during the plume rising stage. Results are [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:218: Plume Cross Section Width 0.6 discharge 0.7 0.6 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:218: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:218: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:218: Plume Cross Section Width 0.6 discharge 0.7 0.6 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:218: Plume Cross Section Width 0.6 discharge 0.7 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:218: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:218: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:218: Plume Cross Section Width 0.6 discharge 0.7 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:227:plume reaches the water surface. Thermal effects are also extremely small, with the temperature of the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf|EN010103-002321-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper (Tracked) Oct 2022 (D9).pdf]]:227:mixing plume falling below 3°C above ambient conditions within a very short distance. Surface [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002237-NZT DCO 8.5 - SoCG - Environment Agency September (Clean) 2022 (D8).pdf|EN010103-002237-NZT DCO 8.5 - SoCG - Environment Agency September (Clean) 2022 (D8).pdf]]:11: plume impacts, emissions to air and the emerging BAT [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000901-NZT DCO 6.2.15 ES Vol I Chapter 15 Ornithology.pdf|EN010103-000901-NZT DCO 6.2.15 ES Vol I Chapter 15 Ornithology.pdf]]:68: sediment plumes creating conditions [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000901-NZT DCO 6.2.15 ES Vol I Chapter 15 Ornithology.pdf|EN010103-000901-NZT DCO 6.2.15 ES Vol I Chapter 15 Ornithology.pdf]]:70:waters (“thermal plume”) to the oxygen within the subtidal or marine fauna, hence no effect on Nature Conservation, Section 14.6 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000901-NZT DCO 6.2.15 ES Vol I Chapter 15 Ornithology.pdf|EN010103-000901-NZT DCO 6.2.15 ES Vol I Chapter 15 Ornithology.pdf]]:86: and diving birds resulting from increases in water turbidity (sediment plumes), [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000901-NZT DCO 6.2.15 ES Vol I Chapter 15 Ornithology.pdf|EN010103-000901-NZT DCO 6.2.15 ES Vol I Chapter 15 Ornithology.pdf]]:86: discharges of heated water (thermal plume) and contaminants arising from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001197-NZT DCO 6.2.4 - ES Vol I Chapter 4 - Oct 2021.pdf|EN010103-001197-NZT DCO 6.2.4 - ES Vol I Chapter 4 - Oct 2021.pdf]]:8: draught cooling towers. These can give rise to visible plumes of water vapour [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001197-NZT DCO 6.2.4 - ES Vol I Chapter 4 - Oct 2021.pdf|EN010103-001197-NZT DCO 6.2.4 - ES Vol I Chapter 4 - Oct 2021.pdf]]:8: dependent on the ambient weather conditions. A short visible plume may be [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001197-NZT DCO 6.2.4 - ES Vol I Chapter 4 - Oct 2021.pdf|EN010103-001197-NZT DCO 6.2.4 - ES Vol I Chapter 4 - Oct 2021.pdf]]:8: operational. However, the proportion of time that the visible plume is predicted [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf|EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf]]:51: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf|EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf]]:51: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf|EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf]]:51: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf|EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf]]:89: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf|EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf]]:89: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf|EN010103-001196-NZT DCO 5.13 - HRA Report - Oct 2021 Rev.2.0.pdf]]:90: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001015-NZT DCO 6.4.2 ES Vol III Appendix 1B EIA Scoping Opinion Part 1.pdf|EN010103-001015-NZT DCO 6.4.2 ES Vol III Appendix 1B EIA Scoping Opinion Part 1.pdf]]:38: • thermal plume; [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001024-NZT DCO 6.4.9 ES Vol III Appendix 9A Flood Risk Assessment Part 1.pdf|EN010103-001024-NZT DCO 6.4.9 ES Vol III Appendix 9A Flood Risk Assessment Part 1.pdf]]:80: there are any remotely sensed measurements of the plume temperature near the site from the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002235-NZT DCO 8.4 - MMO SoCG (Clean) - Sept 2022(D8).pdf|EN010103-002235-NZT DCO 8.4 - MMO SoCG (Clean) - Sept 2022(D8).pdf]]:24: preliminary prediction that any “plume” would quickly dissipate and is likely to be ecological [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf|EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf]]:51: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf|EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf]]:51: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf|EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf]]:52: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf|EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf]]:93: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf|EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf]]:93: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf|EN010103-002062-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Clean) August 2022 (D6).pdf]]:94: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000013-EN010103_Scoping Opinion.pdf|EN010103-000013-EN010103_Scoping Opinion.pdf]]:37: • thermal plume; [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf|EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf]]:50: always met within a few metres of the outfall and before the plume meets the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf|EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf]]:52: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf|EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf]]:52: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf|EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf]]:52: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf|EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf]]:98: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf|EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf]]:98: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf|EN010103-002553-NZT DCO 5.13 - HRA Report (Tracked) - Nov 2022 (D12).pdf]]:99: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001992-NZT DCO 9.24 - Written Summary of ISH4 August 2022 (D5).pdf|EN010103-001992-NZT DCO 9.24 - Written Summary of ISH4 August 2022 (D5).pdf]]:22: the downwash effect from the absorber tower on the plume discharged from the stack and therefore reduced [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002176-NZT DCO 6.4.49 - ES Vol III Appendix 25A Commitments Register Sept 2022(D7) (Clean).pdf|EN010103-002176-NZT DCO 6.4.49 - ES Vol III Appendix 25A Commitments Register Sept 2022(D7) (Clean).pdf]]:13: volumes and to assist the dissipation of any plume a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf|EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf]]:51: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf|EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf]]:51: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf|EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf]]:52: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf|EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf]]:96: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf|EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf]]:96: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf|EN010103-002331-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) Oct 2022 (D9).pdf]]:97: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002410-NZT DCO - 9.46 Applicants’ Response to the ExA's Third Written Questions - Oct 2022 (D11).pdf|EN010103-002410-NZT DCO - 9.46 Applicants’ Response to the ExA's Third Written Questions - Oct 2022 (D11).pdf]]:22: v) Has NE had sight of an updated modelling report that was due, but not Plume modelling of the outfall discharge has been undertaken and this [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002410-NZT DCO - 9.46 Applicants’ Response to the ExA's Third Written Questions - Oct 2022 (D11).pdf|EN010103-002410-NZT DCO - 9.46 Applicants’ Response to the ExA's Third Written Questions - Oct 2022 (D11).pdf]]:26: How can this plume fail to reach the water surface? Typically, effluent plumes are trapped at [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002410-NZT DCO - 9.46 Applicants’ Response to the ExA's Third Written Questions - Oct 2022 (D11).pdf|EN010103-002410-NZT DCO - 9.46 Applicants’ Response to the ExA's Third Written Questions - Oct 2022 (D11).pdf]]:26: not clear that this configuration will give sufficient accuracy to capture the effluent plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002410-NZT DCO - 9.46 Applicants’ Response to the ExA's Third Written Questions - Oct 2022 (D11).pdf|EN010103-002410-NZT DCO - 9.46 Applicants’ Response to the ExA's Third Written Questions - Oct 2022 (D11).pdf]]:26: Please comment on the effect this may have on the concentrations / extent of the plume, and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001161-NZT DCO 6.1 ES Non-Technical Summary.pdf|EN010103-001161-NZT DCO 6.1 ES Non-Technical Summary.pdf]]:33:7.2.14 An assessment of visible plume formation from the cooling plant has been [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001161-NZT DCO 6.1 ES Non-Technical Summary.pdf|EN010103-001161-NZT DCO 6.1 ES Non-Technical Summary.pdf]]:33: undertaken which indicates that a short visible plume may be present for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf|EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf]]:93: in combination with the water effluent plume from effluent Atmospheric deposition rates and water effluent plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf|EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf]]:98: - As the extent of the thermal plume is predominantly away from the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf|EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf]]:99: form part of that solution. It is not apparent if and how the proposal also confirm the potential for the effluent plume to enter the Tees [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf|EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf]]:107: 346] Atmospheric deposition rates and water effluent plume Issue: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf|EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf]]:107: combination with the water effluent plume from effluent containing [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf|EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf]]:122: species, where the SSC plume may prohibit upstream movement. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf|EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf]]:124: sediment concentrations (SSC) and create a sediment plume within [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf|EN010103-001579-NZT DCO 9.6 - Applicants' Comments on RRs - May 2022.pdf]]:142: algal mats that are reducing the available foraging area for qualifying plume to enter the Tees Estuary and adversely affect the qualifying [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002067-NZT DCO 8.4 - Marine Management Organisation SoCG (Tracked) August 2022 (D6).pdf|EN010103-002067-NZT DCO 8.4 - Marine Management Organisation SoCG (Tracked) August 2022 (D6).pdf]]:25: preliminary prediction that any “plume” would quickly dissipate and is likely to be ecological [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000005-EN010103_Scoping Report.pdf|EN010103-000005-EN010103_Scoping Report.pdf]]:47: contamination hotspots or plumes, quantitative risk assessment, remediation and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000005-EN010103_Scoping Report.pdf|EN010103-000005-EN010103_Scoping Report.pdf]]:69:  visible emissions, for example smoke or visible plumes. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf|EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf]]:54: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf|EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf]]:54: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf|EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf]]:54: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf|EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf]]:97: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf|EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf]]:97: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf|EN010103-002063-NZT DCO 7.12 - Habitats Regulations Assessment Report (Change Request) (Tracked) August 2022 (D6).pdf]]:98: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002068-NZT DCO 8.5 - Environment Agency SoCG (Clean) August 2-22 (D6).pdf|EN010103-002068-NZT DCO 8.5 - Environment Agency SoCG (Clean) August 2-22 (D6).pdf]]:11: plume impacts, emissions to air and the emerging BAT [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf|EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf]]:12: dispersion, not temporal change. In the real world, as the plume travels [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf|EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf]]:14: released would have been converted to N-amine by the time the plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf|EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf]]:17: recommended by CERC for low concentration plumes for the Amines [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf|EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf]]:17: module) to represent slower mixing of the ambient air within the plume – [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf|EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf]]:17: rather than instantaneous mixing with an ambient air “parcel” at plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf|EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf]]:19: the additional dispersion of the plume over the greater distance and the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf|EN010103-001023-NZT DCO 6.4.8 ES Vol III Appendix 8C Air Quality - Amine Degradation Assessment.pdf]]:23: formation in the emission plume from a carbon capture plant. Onel, L. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf|EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf]]:51: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf|EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf]]:51: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf|EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf]]:51: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf|EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf]]:90: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf|EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf]]:90: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf|EN010103-001478-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Tracked.pdf]]:91: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002037-Orsted Hornsea Project Four Limited - Responses to the ExA’s ExQ2.pdf|EN010103-002037-Orsted Hornsea Project Four Limited - Responses to the ExA’s ExQ2.pdf]]:34:the impact of this on seismic data quality and ability to monitor the CO2 plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002037-Orsted Hornsea Project Four Limited - Responses to the ExA’s ExQ2.pdf|EN010103-002037-Orsted Hornsea Project Four Limited - Responses to the ExA’s ExQ2.pdf]]:35:different acquisition techniques and exclusion zones the ability of 4D seismic to monitor the CO2 plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002037-Orsted Hornsea Project Four Limited - Responses to the ExA’s ExQ2.pdf|EN010103-002037-Orsted Hornsea Project Four Limited - Responses to the ExA’s ExQ2.pdf]]:297: seabed to Bunter, and the ability to monitor the spread of the CO2 plume; [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002037-Orsted Hornsea Project Four Limited - Responses to the ExA’s ExQ2.pdf|EN010103-002037-Orsted Hornsea Project Four Limited - Responses to the ExA’s ExQ2.pdf]]:297: spread of the CO2 plume; [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf|EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf]]:11: No maximum width is stated for either stack. Their final locations are not fixed effects that affect the dispersion of the plume from the stack on top of the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf|EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf]]:11: Can the Applicants confirm the minimum width parameter for the main further increasing the momentum of the plume on exit from the stack and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf|EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf]]:35: (CO) and ammonia (NH3) would be higher from the carbon capture stack during unabated operation will mean that the plume has [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf|EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf]]:35: absorber than those from the CCGT running in unabated mode? improved thermal buoyancy compared to the plume from the absorber [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf|EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf]]:35: ii) What consequences would this have for the visibility of the plume? stack in abated mode and therefore, will result in greater dispersion [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf|EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf]]:36: plume than the absorber stack operating in abated mode. A plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf|EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf]]:38: prevailing wind direction would mean that the plume would travel away from the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf|EN010103-001780-NZT DCO 9.7 - Applicants' Response to ExA's FWQs - June 2022.pdf]]:153: available information about operational effluent discharges to conclude a slight Bay during operation is based on the fact that i) the thermal plume modelling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001130-NZT DCO 6.4.41 ES Vol III Appendix 17C Potential Viewpoints.pdf|EN010103-001130-NZT DCO 6.4.41 ES Vol III Appendix 17C Potential Viewpoints.pdf]]:7: the background view. A plume and pylons are visible above [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:6:Results of near-field thermal plume modelling undertaken using the CORMIX modelling software show [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:6:that, for Outfall 1 under spring conditions, the likely extent of a thermal plume (with a 15°C excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:6:extent of the plume increases to 140 m. Considering a further reduced excess temperature shows that [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:6:and 720 m on an ebb. In all cases tested, the mixing and plume dispersion appear to occur very rapidly [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:6:outfall plume, the neap tidal phases offer a larger plume, with the 2°C contour extending 600 m and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:6:Far field plume dispersion modelling using the Delft3D model shows a small impact of outfall discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:7: 1.1 Near-field thermal plume modelling ..................................................................................................2 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:7: 1.2 Far-field thermal plume modelling ......................................................................................................2 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:8:Table 10. Thermal plume properties in Delft3D, summer and winter case .......................................... 17 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:8:Figure 14. Spring and neap flood tide plume variations during normal discharge events. ............ 13 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:8:Figure 15. Spring and neap ebb tide plume variations during normal discharge events. ............... 14 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:11:Figure 82. Spring and neap flood tide plume variations during extreme discharge events. .......... 91 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:11:Figure 83. Spring and neap ebb tide plume variations during normal discharge events. ............... 92 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:12:AECOM Ltd. have commissioned ABPmer to undertake hydrodynamic and thermal plume modelling of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:14:  Near-field thermal plume modelling at two different outfall locations; and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:14:  Far-field 3D thermal plume modelling. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:14:1.1 Near-field thermal plume modelling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:14:model to construct thermal plume simulations using the MixZon Inc. CORMIX modelling software. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:14:quantify the possible extent of a plume from both outfall locations with particular thermal properties. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:14:1.2 Far-field thermal plume modelling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:14:Section 2: CORMIX Modelling – Outfall 1: Provides details of the thermal plume model setup and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:14:Section 3: CORMIX Modelling – Outfall 2: Provides details of the updated thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:16:CORMIX thermal plume modelling, as described in the following sections. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:19:flood and ebb conditions as in Table 1) and shows the ebb plume (Run 10) to better maintain its excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:19:Shown in Figure 7 is the plume sensitivity to winds. The summer wind value of 4.08 m/s is a light wind [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:19:and doesn’t appear to have any influence on the plume when comparing runs 01 and 03. When a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:19:significantly stronger wind of 15 m/s is applied (Run 16), the plume is slightly affected causing the excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:20:Figure 8 shows the tests addressing the plume sensitivity to the discharge port diameter. The baseline [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:20:Figure 9 shows the plume sensitivity to projection of the outfall port. Run 01 has a vertical projection [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:23:As stated in Section 2, CORMIX modelling, assessing the near-field impact of the of thermal plume has [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:35:In order to test the sensitivity of the plume discharge to wind directions, two further simulations have [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:35: differences in the distribution of the thermal plume: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:35:  When a south easterly (120°) wind is applied to the summer thermal plume discharge scenario [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:35: the effect is to reduce the eastern extent of the thermal plume. This is more pronounced in the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:35: neap comparisons where flow speeds are lower and the along-coast extent of the plume is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:40:the Outfall 1 site are consistently higher which may be contributing to faster dispersion of the plume as [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:40:This plot shows the along shore flow directing the plume discharge into the estuary. Plot Figure 29 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:Near-field thermal plume modelling has been undertaken using the CORMIX modelling software to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:conditions, the likely extent of a thermal plume (of the properties modelled) would be very localised: a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:m on the ebb. Considering a 2°C temperature excess the ebb extent of the plume increases to 140 m, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:To examine the wider plume dispersion a 0.1°C temperature excess contour was exported from CORMIX. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:allow the plume to stay buoyant for longer, however the excursion from the plume would be limited by [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:Sensitivity testing showed only a small influence on plume extent due to wind and seasonal variations, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:the plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:outfall plume, the neap tidal phases offer a larger plume, when compared to the spring tide, under [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:normal discharge conditions. In particular, the neap flood tide offers the largest plume extent as [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:However, it is to be noted that the CORMIX model assumes full plume development under the given [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:enough for a fully developed plume (as defined) to form. As the flows reduce, either side of the peak [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:conditions modelled, and turn with the tidal phase, further dissipation of the plume is expected before [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:Far field plume dispersion modelling has been undertaken using the Delft3D modelling software using [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:48:Temperature excess plots of the plume impact have shown a small impact of the outfall discharge on [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:55:thermal plume or contamination modelling. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:103:Figure 82 shows the downstream temperature excess of the resultant plume during a spring (run 26) [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:103:characteristics again result in a more extensive plume, reducing the excess temperature at a slower rate [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf|EN010103-001144-NZT DCO 6.4.33 ES Vol III Appendix 14E Coastal Modelling Report.pdf]]:103:Figure 82. Spring and neap flood tide plume variations during extreme discharge events. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001159-NZT DCO 5.7 - Carbon Capture Readiness Assessment.pdf|EN010103-001159-NZT DCO 5.7 - Carbon Capture Readiness Assessment.pdf]]:23: each Absorber. An early evaluation of the potential visible plumes has been [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002066-NZT DCO 8.4 - Marine Management Organisation SoCG (Clean) August 2022 (D6).pdf|EN010103-002066-NZT DCO 8.4 - Marine Management Organisation SoCG (Clean) August 2022 (D6).pdf]]:25: preliminary prediction that any “plume” would quickly dissipate and is likely to be ecological [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf|EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf]]:249: plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf|EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf]]:252: behaviour of the CO2 plume and possible migration out of the CO2 store. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf|EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf]]:254: CO2 plume. In that sense, OBN and P-cables (and a hybrid of the two) are [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf|EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf]]:260: conformance of the CO2 plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf|EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf]]:261: operators to ensure containment and conformance of a CO2 plume. In that sense, OBN [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf|EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf]]:262: conformance of the CO2 plume. Mr Sewell saying that he is not suggesting that bp [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf|EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf]]:262: ability to monitor the CO2 plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf|EN010103-002078-NZT DCO - 9.27 Applicants’ Response to the ExA's Second Written Questions - August 2022 (D6).pdf]]:265: exclusion zones the ability of 4D seismic to monitor the CO2 plume.” [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001526-NZT-ExQ1.pdf|EN010103-001526-NZT-ExQ1.pdf]]:20: ii) What consequences would this have for the visibility of the plume? [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:2:Annex B: Assessment of Visible Plumes from absorber stack and cooling towers 8-33 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:3:8.1.7 Annex B of this Appendix provides an assessment of visible plumes from the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:Annex B: Assessment of Visible Plumes from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:relatively low temperature of the release, there is potential for the plume released from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:the stack to be visible. The ADMS module can assess the potential for visible plumes [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:The plume from the stack is described as being “visible” when liquid water is present [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:in the plume above a critical threshold of 0.002kg/kg. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:plumes, however this guidance is now outdated. An assessment has therefore been [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:emission, except for the selection of plume visibility in the model set-up and the input [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:of initial water content in the plume. The initial water vapour mixing ratio of the plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:5 defines the plume to be ‘visible’ at a particular downwind distance if the ambient [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:humidity at the plume centreline is below 98%, above which it is considered the plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:would lead to the worst-case visible plumes, with plumes being visible for up to 40% [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:of the time. The plume would only be longer than 115 metres (i.e. the height of the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:Table B1: Summary of Visible Plumes for a 35°C Release [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35:Year Plume is Visible Plume Length Plume Length (m) [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:35: Plume Over 115m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:Table B2: Summary of Visible Plumes for a 60°C Release [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:Year of Time Plume Length (m) Plume Length (m) There is a Visible Plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36: Plume is Over 115m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:In addition to the potential for visible plumes to occur from the absorber stack, there is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:also potential for visible plumes to occur from the mechanical draft cooling towers. The [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:potential for visible plumes to occur from the cooling cells has therefore been modelled [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:Table B3: Cooling Cell Visible Plume Model Inputs [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:indicate that a short visible plume may be present for the majority of the time once the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:plume is predicted to exceed the boundary of the Low Carbon Electricity Generating [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:Table B4: Cooling Cell Visible Plumes [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:Met Percentage of Longest Average Visible Plume Percentage of Time There [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36:Year Time Plume is Visible Length (m) is a Visible Plume Over [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf|EN010103-001022-NZT DCO 6.4.7 ES Vol III Appendix 8B Air Quality - Operation Phase.pdf]]:36: Visible Plume 100m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf|EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf]]:50: always met within a few metres of the outfall and before the plume meets the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf|EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf]]:52: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf|EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf]]:52: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf|EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf]]:52: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf|EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf]]:98: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf|EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf]]:98: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf|EN010103-002509-NZT DCO 7.16 - HRA for Change Request (Tracked) - Nov 2022 (D12).pdf]]:99: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001588-NZT DCO 8.6 - NE SoCG - May 2022.pdf|EN010103-001588-NZT DCO 8.6 - NE SoCG - May 2022.pdf]]:48: noted that at this location, the wind direction takes the plume over [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf|EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf]]:51: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf|EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf]]:51: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf|EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf]]:51: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf|EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf]]:89: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf|EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf]]:89: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf|EN010103-000885-NZT DCO 5.13 - Habitat Regulations Assessment Report.pdf]]:90: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf|EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf]]:52: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf|EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf]]:52: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf|EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf]]:52: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf|EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf]]:94: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf|EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf]]:94: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf|EN010103-002056-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) August 2022 (D6).pdf]]:95: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf|EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf]]:50: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf|EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf]]:51: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf|EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf]]:51: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf|EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf]]:89: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf|EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf]]:89: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf|EN010103-001479-NZT DCO 5.13 Habitat Regulations Assessment Report Rev 3 Final 2022-04-26.pdf]]:90: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf|EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf]]:52: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf|EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf]]:52: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf|EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf]]:53: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf|EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf]]:91: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf|EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf]]:91: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf|EN010103-001849-5.13 - HRA Report (Clean) - June 2022(D3).pdf]]:92: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf|EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf]]:22: Visual Plume (Steam) [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf|EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf]]:22:4.4.13 It is envisaged that there will not be any visible plumes (steam) during the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf|EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf]]:22: the frequency of a visual plume. The visibility of an atmospheric plume is due to the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf|EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf]]:22: visible plume emissions. The plume visibility implications have been considered as [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf|EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf]]:22: ‘average’ visible plume length is expected to be 42 m with plumes visible for up to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf|EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf]]:22: 72% of the time. The longest plume can be expected to extend for 2,348 m with [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf|EN010103-001153-NZT DCO 5.9 - Statutory Nuisance Statement.pdf]]:22: plumes over 115 m visible 9% of the time on average. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002387-Environment Agency - Comments on any other information submitted at Deadline 10.pdf|EN010103-002387-Environment Agency - Comments on any other information submitted at Deadline 10.pdf]]:1: How can this plume fail to reach the water surface? Typically, effluent plumes are trapped at [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002387-Environment Agency - Comments on any other information submitted at Deadline 10.pdf|EN010103-002387-Environment Agency - Comments on any other information submitted at Deadline 10.pdf]]:1: is not clear that this configuration will give sufficient accuracy to capture the effluent plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002387-Environment Agency - Comments on any other information submitted at Deadline 10.pdf|EN010103-002387-Environment Agency - Comments on any other information submitted at Deadline 10.pdf]]:1: Please comment on the effect this may have on the concentrations / extent of the plume, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:24:plume development away from wells. Further studies are required before a definitive conclusion can be [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:24:monitoring storage conformance and CO2 plume development away from wells. This would be unless [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:25: • CCUS operator to provide current MMV requirements for CO2 plume monitoring for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:42:where possible the CO2 plume and where appropriate the surrounding environment. The initial plan [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:42:Monitoring plume development from the injection wells is a key indicator of storage site behaviour. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:43:The plume will continue to migrate after injection with time lapse seismic providing confirmation. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:43:confirm the migration of the CO2 plume if required. If the storage site is behaving as expected [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:46:Four monitor surveys were proposed over the lifecycle of the storage site based on the fact that plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:46:injection on plume migration and assessment of store and well integrity. However, the cost of acquiring [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:49:offer the potential for accurate monitoring of the plume and seabed deformation (as a by-product of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:51: • The size of array would be based on models. If model prediction of plume development is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:51: wrong and the plume extends outside of the predicted area the array would lack the necessary [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:51:value of DAS/DTS to monitor plume growth. At these locations downhole DAS/DST has been used to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:51:effective method of monitoring plume growth. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:51: • Sparse PRM system focused on injectors and early plume area. This is the area where storage [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:63:injection on plume migration and assessment of store integrity. However, navigating a 3D seismic [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:64: • Sparse PRM system focused on injectors and early plume area. This is the area where storage [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:75:hypersaline plume rapidly over an area of 10 - 100s of metres in all directions. Where the brine is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:75:hypersaline brine diffusion. They suggest that the model used is more appropriate for far-field plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:75:simulations and therefore not suited to measure near to mid field spreading of the plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:88:plume development away from wells. Further studies are required before a definitive conclusion can be [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:88:acquisition for monitoring storage conformance and CO2 plume development away from wells. This [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:88: • CCUS operator to provide current MMV requirements for CO2 plume monitoring for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:88:The focus of this section was to review MMV activities that are mainly used to monitor CO2 plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:88:injection on plume migration and assessment of store integrity. However, there are challenges with [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:89: • Sparse PRM system focused on injectors and early plume area. This is the area where storage [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:93:[[24]] “Using a Walk Away DAS Time-lapse VSP fro CO2 Plume Monitoring at the Quest CCS [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:93: plume-monitoring. [[Accessed Jan 2022]]. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:122: from injecting CO2 into the store and tracking the CO2 plume needs to be acquired and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:126: the extent, and manner in which, the CO2 plume migrates within the store; [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:126: the store is developed using actual, observed CO2 plume migration information [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:126: way of detecting and identifying the extent to which, over time, the location of the plume of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:127: a very different migration of a CO2 plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:127: Figure 5: Examples of how the CO2 plume may behave in simple and complex [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:127: “light up” where and how the CO2 plume behaves following CO2 injection. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:129: settlement of the CO2 plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:130: NEP. The use of proven technology to monitor the CO2 plume and Endurance Store [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:135: physically undevelopable. This is due to the inability of NEP to image the CO2 plume in all [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:153:CO2 within the storage complex and monitor CO2 plume migration within the reservoir. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:153:producers will be progressively located based on actual, observed CO2 plume migration (also [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:154:plume detection within a saline aquifer, is the most established and well-understood [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:168:to which the CO2 forms a central plume versus moves in unexpected ways which could lead [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:169:the reservoir and forms a crestal plume. In the complex scenario compartmentalisation (left) and vertical [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:169:stratification (right) inhibit cretal plume formation and the location of the CO2 in the reservoir is much more [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:169: (c) A plume of CO2 forms in the crest of the structure [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:182: • manage evacuation from a possible CO2 plume dispersion pathway, or [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:189: • Risk of CO2 plumes within the windfarm during manned activity [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:196:containment and conformance of the CO2 plume within the storage site. Its effectiveness lies [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:196:saturations over time. The quality of the data showed that actual plume migration was [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:196:instrumental in accurate plume migration detection and mapping, thus revealing the complex [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf|EN010103-001776-NZT DCO 9.8 - Appendix GEN.1.2 Position Statement Hornsea Project Four and BP - June 2022.pdf]]:199:developing” approach. As the CO2 plume migration is observed over time through high quality [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001779-NZT DCO 9.8 - Appendix BIO.1.39 Example Marine Pollution Contingency Plan - June 2022.pdf|EN010103-001779-NZT DCO 9.8 - Appendix BIO.1.39 Example Marine Pollution Contingency Plan - June 2022.pdf]]:35: • As dispersion is achieved it will produce a ‘smoke plume’ plume in the water. The dispersion will [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001779-NZT DCO 9.8 - Appendix BIO.1.39 Example Marine Pollution Contingency Plan - June 2022.pdf|EN010103-001779-NZT DCO 9.8 - Appendix BIO.1.39 Example Marine Pollution Contingency Plan - June 2022.pdf]]:35: • If too much dispersant is being applied, a milky white plume will appear close to the surface of the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001779-NZT DCO 9.8 - Appendix BIO.1.39 Example Marine Pollution Contingency Plan - June 2022.pdf|EN010103-001779-NZT DCO 9.8 - Appendix BIO.1.39 Example Marine Pollution Contingency Plan - June 2022.pdf]]:37: of dispersion, if dispersion is achieved it will produce a grey or coffee-coloured plume in the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001779-NZT DCO 9.8 - Appendix BIO.1.39 Example Marine Pollution Contingency Plan - June 2022.pdf|EN010103-001779-NZT DCO 9.8 - Appendix BIO.1.39 Example Marine Pollution Contingency Plan - June 2022.pdf]]:37: If a white plume is visible in the water this indicates that overdosing has occurred. To prevent [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001581-NZT DCO 5.3 - Planning Statement - May 2022.pdf|EN010103-001581-NZT DCO 5.3 - Planning Statement - May 2022.pdf]]:230: structure (including any associated emission plume) after mitigation. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf|EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf]]:51: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf|EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf]]:51: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf|EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf]]:52: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf|EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf]]:96: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf|EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf]]:96: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf|EN010103-002330-NZT DCO 5.13 - Habitats Regulations Assessment Report (Clean) Oct 2022 (D9).pdf]]:97: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000896-NZT DCO 6.2.4 ES Vol I Chapter 4 Proposed Development.pdf|EN010103-000896-NZT DCO 6.2.4 ES Vol I Chapter 4 Proposed Development.pdf]]:8: draught cooling towers. These can give rise to visible plumes of water vapour [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000896-NZT DCO 6.2.4 ES Vol I Chapter 4 Proposed Development.pdf|EN010103-000896-NZT DCO 6.2.4 ES Vol I Chapter 4 Proposed Development.pdf]]:8: dependent on the ambient weather conditions. A short visible plume may be [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000896-NZT DCO 6.2.4 ES Vol I Chapter 4 Proposed Development.pdf|EN010103-000896-NZT DCO 6.2.4 ES Vol I Chapter 4 Proposed Development.pdf]]:8: operational. However, the proportion of time that the visible plume is predicted [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002177-NZT DCO 6.4.49 - ES Vol III Appendix 25A Commitments Register Sept 2022(D7) (Tracked).pdf|EN010103-002177-NZT DCO 6.4.49 - ES Vol III Appendix 25A Commitments Register Sept 2022(D7) (Tracked).pdf]]:13: volumes and to assist the dissipation of any plume a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001151-NZT DCO 6.4.49 ES Vol III Appendix 25A Commitments Register.pdf|EN010103-001151-NZT DCO 6.4.49 ES Vol III Appendix 25A Commitments Register.pdf]]:10:Appendix 5A – relatively low discharge volumes and to assist the dissipation of any plume a diffuser will be [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf|EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf]]:52: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf|EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf]]:52: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf|EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf]]:53: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf|EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf]]:91: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf|EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf]]:91: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf|EN010103-001850-5.13 - HRA Report (Tracked) - June 2022(D3).pdf]]:92: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001915-NZT DCO 9.20 - Applicants response to Orsted HP4 D3 Submission July 2022 (D4).pdf|EN010103-001915-NZT DCO 9.20 - Applicants response to Orsted HP4 D3 Submission July 2022 (D4).pdf]]:21: be used will lead to high quality data, sufficient to accurately monitor the CO2 plume (even [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001915-NZT DCO 9.20 - Applicants response to Orsted HP4 D3 Submission July 2022 (D4).pdf|EN010103-001915-NZT DCO 9.20 - Applicants response to Orsted HP4 D3 Submission July 2022 (D4).pdf]]:23: to Bunter, and thus the ability to monitor the spread of the CO2 plume. Part of this [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001915-NZT DCO 9.20 - Applicants response to Orsted HP4 D3 Submission July 2022 (D4).pdf|EN010103-001915-NZT DCO 9.20 - Applicants response to Orsted HP4 D3 Submission July 2022 (D4).pdf]]:27: non-containment or non-conformance of the CO2 plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001915-NZT DCO 9.20 - Applicants response to Orsted HP4 D3 Submission July 2022 (D4).pdf|EN010103-001915-NZT DCO 9.20 - Applicants response to Orsted HP4 D3 Submission July 2022 (D4).pdf]]:36: the higher resolution required to be able to detect CO2 away from the main plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001915-NZT DCO 9.20 - Applicants response to Orsted HP4 D3 Submission July 2022 (D4).pdf|EN010103-001915-NZT DCO 9.20 - Applicants response to Orsted HP4 D3 Submission July 2022 (D4).pdf]]:36: after the injection phase is completed in order to ensure the stability of the plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:4: necessary 4D seismic monitoring of the CO2 plume. Towed streamer will have a lower cost and is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:4: ability to monitor the spread of the CO2 plume. Part of this evaluation should include field trials [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:18:Endurance area to map the spread of the injected CO2 plume in the subsurface while the area is partially covered [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:19:monitoring of the CO2 plume. Towed streamer will have a lower cost and is the default choice for a reservoir such [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:19:the impact on imaging from seabed to Bunter, and thus the ability to monitor the spread of the CO2 plume. Part of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:23:subsurface imaging and monitoring of the spread of the CO2 plume. These permanent nodes for microseismic [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:24:acquisition for monitoring storage conformance and CO2 plume development away from wells”. I don’t agree with [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:25:even small amounts of CO2 are present outside of the main plume, but high resolution seismic is required to image [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:29:seismic acquisition is uniquely suited to the shallow geology and CO2 plume detection within a saline aquifer, is the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:34:better, and should be modelled. The OBN 4D data would then be able to monitor the spread of the CO2 plume in [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:35:acquiring the high resolution data needed to verify containment and conformance of the CO2 plume within the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:35:plume development. This favourable outcome is attributed to the time-lapse processing and the large contrast in [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:36:highlighted by Furre et al. Nonetheless the 4Ds have been successful at tracking the CO2 plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:38:compartmentalisation effects”. The imaging of potential compartments and 4D effects for tracking the CO2 plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:39:without compromising the ability of the 4D data to image the CO2 plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:41:CO2 plume into the formation. This can either be a time-lapse seismic monitoring where 3D surveys are repeated at [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:42:of the K42 White Rose report describes it thus “The development of the plume and the migration of the injected CO2 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:46:should be able to provide the necessary 4D seismic monitoring of the CO2 plume. Towed streamer will have a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf|EN010103-001824-Orsted Hornsea Project Four Limited - Comments on the Applicants’ dDCO.pdf]]:47:on imaging from seabed to Bunter, and thus the ability to monitor the spread of the CO2 plume. Part of this [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000906-NZT DCO 6.2.22 ES Vol I Chapter 22 Major Accidents and Natural Disasters.pdf|EN010103-000906-NZT DCO 6.2.22 ES Vol I Chapter 22 Major Accidents and Natural Disasters.pdf]]:33: A CO2 plume from a release neighbouring industrial sites is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:22:with the water effluent plume from effluent containing noted that there is no WFD classification available for nitrogen [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:23:sediment plumes need to be taken into account in the Screening stage (see paragraph 9.5.6 and Table 9C-10). At [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:23: sediment plumes, and this is considered in Table 9C-15 (Tees [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:23: Potential impacts from a thermal/sediment plume scoped into [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:23: plumes have taken consideration of the spatial area of impact [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:53: adjacent to the waterbody. There is also the potential for an effluent plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:57: physical disturbance and changes in water quality (e.g. a sediment plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:57: outfall causing thermal plumes or chemical changes in water quality including [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:57: effluent plumes: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:57: potential sediment, chemical or thermal plume to be produced by the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:58: chemical effluent plume may be larger and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:58: chemical effluent plume may be larger and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:58: the ZoI of the DIN effluent plume from the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:59: operational impacts such as the release of a thermal plume from process [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:59:change in depth or discharge plume or pollutants in [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:62:Biology: Habitats Habitats and benthic Potential temporary sediment plume during [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:62: invertebrates construction or thermal/chemical plume during [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:62: create a plume that would slightly enter the mouth of the estuary, although [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:64: plume that would slightly enter the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:64: plume (for DIN) to enter the mouth of the estuary, at depth within the dredged [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:65: noting that this also includes the footprint of thermal or sediment plumes: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:65:0.5 km2 or ✓ Any plume relating to runoff laden with fine [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:65:1% or more of ✓ Any plume relating to runoff laden with fine [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:65: effluent plume from the new outfall location. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:67: conditions, and at depth (i.e. not at the surface; plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:79: sediment plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:79:9.7.51 However, it is considered that any sediment plume arising from this [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:79: and mammals are able to avoid the plume. Furthermore, the relatively [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:79: scale and any sediment plume would be very quickly dispersed by the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:95:9.7.135 Mixing zone plumes in CORMIX are modelled over different stages; the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:95: rising stage) and the later period of mixing when the plume reaches the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:95: by diffusion of the plume into the large ambient water volume. Further details [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:95: the thermal plume and the apparent degree of mixing, it is unlikely that the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:95: habitats and associated communities within the footprint of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:95: between the small thermal plume and intertidal habitats and so the magnitude [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:95: thermal plume has been shown to be very localised, and thermal effluent [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:95: footprint of the thermal plume on the seabed will likely be further reduced. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:96: such as sandeels) to the thermal plume is unlikely to result in changes to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:96: communities in terms of abundance and diversity. The thermal plume is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:96: establishment of non-natives linked to the thermal plume is therefore [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:99: plume rising stage for low tide, high tide and maximum current conditions. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:114: within the Tees Bay. A smaller area within the wider plume will exceed the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:171:concentrations are diluted to below the EQS. Mixing zone plumes in CORMIX are modelled over [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:171:period of mixing when the plume reaches the water surface and spreads laterally (the surface spreading [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:171:while dilution during the surface spreading stage is more dominated by diffusion of the plume into the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:171:zone plumes in different ways depending on the current conditions specified: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:171: pair of ports and resolve the dimensions of the resulting three individual plumes (Figure 4-2). [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:172: resolve individual mixing plumes for each pair of outfalls, although the plumes are significantly [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:172: of each plume and for the surface spreading stage. The plumes combine and become vertically [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:172: 0.271 m/s respectively) the plumes undergo rapid lateral mixing at the point of discharge. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:172: CORMIX represents this by combining the plumes into a single mixing zone for both the vertical [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:172:mixing plume above the outfall, the lateral distance travelled by the plume and the cross section width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:172:of the mixing zone plume at the point when the EQS is reached. If the EQS is met in the surface [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:173:plume rising stage. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:173: Plume Cross Section Width 1.9 0.5 1.0 0.6 0.9 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:173: Plume Cross Section Width 15 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:173: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:173: Plume Cross Section Width 1.8 0.4 0.5 0.3 0.5 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:173: Plume Cross Section Width 1.9 0.5 1.0 0.4 0.3 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:173: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:173: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:173: Plume Cross Section Width 1.8 0.4 0.8 0.3 0.3 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:173:The results in Table 4-3 show that EQS values for all substances are met within the plume rising stage [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:174:scenario is 0.34 m/s and the EQS for all substances are met during the plume rising stage. Results are [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:175: Plume Cross Section Width 0.6 discharge 0.7 0.6 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:175: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:175: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:175: Plume Cross Section Width 0.6 discharge 0.7 0.6 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:175: Plume Cross Section Width 0.6 discharge 0.7 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:175: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:175: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:175: Plume Cross Section Width 0.6 discharge 0.7 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:184:plume reaches the water surface. Thermal effects are also extremely small, with the temperature of the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf|EN010103-002423-NZT DCO - 6.4.11 ES Vol III Appendix 9C WFD Assessment - Oct 2022 (D11) (Clean).pdf]]:184:mixing plume falling below 3°C above ambient conditions within a very short distance. Surface [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf|EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf]]:52: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf|EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf]]:52: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf|EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf]]:53: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf|EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf]]:94: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf|EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf]]:94: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf|EN010103-002257-NZT DCO - 5.13 - HRA (Clean) - Sept 2022(D8).pdf]]:95: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001150-NZT DCO 6.4.48 ES Vol III Appendix 24C Statement of Combined Effects.pdf|EN010103-001150-NZT DCO 6.4.48 ES Vol III Appendix 24C Statement of Combined Effects.pdf]]:42: • visible plume from the Proposed [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001150-NZT DCO 6.4.48 ES Vol III Appendix 24C Statement of Combined Effects.pdf|EN010103-001150-NZT DCO 6.4.48 ES Vol III Appendix 24C Statement of Combined Effects.pdf]]:50: • Plume arising from the stack experience short-term moderate [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002236-NZT DCO 8.4 - MMO SoCG (Tracked) - Sept 2022(D8).pdf|EN010103-002236-NZT DCO 8.4 - MMO SoCG (Tracked) - Sept 2022(D8).pdf]]:25: preliminary prediction that any “plume” would quickly dissipate and is likely to be ecological [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf|EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf]]:53: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf|EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf]]:53: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf|EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf]]:53: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf|EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf]]:96: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf|EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf]]:96: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf|EN010103-002057-NZT DCO 5.13 - Habitats Regulations Assessment Report (Tracked) August 2022 (D6).pdf]]:97: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf|EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf]]:79: cause an oxygen demand within the sediment plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf|EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf]]:80:9.6.12 It is not considered that any sediment plume arising from MBT construction [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf|EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf]]:80: able to avoid the plume. Furthermore, the relatively shallow inshore of the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf|EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf]]:87:9.6.48 Results of near-field thermal plume modelling undertaken using the CORMIX [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf|EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf]]:87: extent of a thermal plume (with a 15°C excess temperature at source) would [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf|EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf]]:87: temperature excess, the ebb extent of the plume increases to 140m. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf|EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf]]:87: plume dispersion appear to occur very rapidly from the origin with very little [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf|EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf]]:87: rates of dissipation of the outfall plume, the neap tidal phases offer a larger [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf|EN010103-000895-NZT DCO 6.2.9 ES Vol I Chapter 9 Surface Water, Flood Risk and Water Resources.pdf]]:88: plume, with the 2°C contour extending 600 m and 400 m from the outfall on [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000894-NZT DCO 6.2.8 ES Vol 1 Chapter 8 Air Quality.pdf|EN010103-000894-NZT DCO 6.2.8 ES Vol 1 Chapter 8 Air Quality.pdf]]:10: assessment, then this would have the potential to reduce the plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000894-NZT DCO 6.2.8 ES Vol 1 Chapter 8 Air Quality.pdf|EN010103-000894-NZT DCO 6.2.8 ES Vol 1 Chapter 8 Air Quality.pdf]]:25: the significance of visible plumes prior to DCO plumes has been carried out [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:56: sediment plume (with associated deposition effects) within the marine [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:59: plume of sediment which could present a barrier to migration. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:87: found at the release point from the outfall – or the ‘thermal plume’ - may also [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:87: ‘Outfall 1’ and ‘Outfall 2’, respectively. To construct the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:88: discharge volumes proposed and to assist the dissipation of any plume, a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:88: the largest thermal plume extent at the existing outfall was found to be during [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:89: largest plume was identified for a neap tide under normal discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:89: provided the largest plume at both the existing and replacement outfalls, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:90: thermal plume is predicted to be largest under this scenario), the likely extent [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:90: of thermal plume would be very localised with a 2°C temperature excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:90:14.6.195 At the replacement outfall, the likely extent of thermal plume during neap [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:90: tides (when the thermal plume is predicted to be largest under this scenario) [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:91: arising from the plume even when precautionary assumptions have been used [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:91: the faster dispersion of the plume. However, in some scenarios the thermal [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:91: plume from the existing outfall was seen inside the mouth of the estuary and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:92: the Estuary. In the winter spring tide simulation, where the plume extended [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:92: overlap between the HPS discharge and the thermal plume from either the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:92: extremities of the plume (i.e. where the temperature excess is <0.2°C). When [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:93:14.6.204 Given the highly limited predicted extent of the thermal plume in both [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:93: the footprint of the thermal plume are considered to be highly resistant and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:93: limited interaction between the thermal plume and intertidal habitats and so [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:93:14.6.210 Table 14-19, the extent of the thermal plume within the water column at both [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:93: a small temperature uplift of 1°C the thermal plume is predicted to extend [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:93: water) and therefore the footprint of the thermal plume on the seabed will [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:94:14.6.216 Overall, the risk that treated effluent, and associated thermal plume, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:94: thermal plume is therefore predicted to be Not Significant. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:94:14.6.218 Table 14-19, the extent of the thermal plume from both the existing and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:94: the results from far-field modelling, the extent of the plume is larger however, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:95: sandeels) to the thermal plume is highly unlikely to result in changes to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:95: change in sea temperature. The thermal plume is also not predicted to affect [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:95: of the extent of the thermal plume is away from the mouth of the Estuary and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:104: species, where the SSC plume may prohibit upstream movement. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:109: and create a sediment plume within the marine environment: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:110: expected that any SSC plume would be small and would settle rapidly close [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:111: create a SSC plume which has the potential occur over larger distances. This [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf|EN010103-000900-NZT DCO 6.2.14 ES Vol I Chapter 14 Marine Ecology and Nature Conservation.pdf]]:111: impacts to turbidity, a plume of sediment is unlikely to present a barrier to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000917-NZT DCO 6.2.24 ES Vol I Chapter 24 Cumulative and Combined Effects.pdf|EN010103-000917-NZT DCO 6.2.24 ES Vol I Chapter 24 Cumulative and Combined Effects.pdf]]:74: the SSC plume may prohibit upstream movement. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf|EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf]]:50: always met within a few metres of the outfall and before the plume meets the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf|EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf]]:52: Finally, near-field thermal plume modelling has been undertaken for the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf|EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf]]:52: proposed outfall location. This confirms that the likely extent of a thermal plume (of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf|EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf]]:52: low and the thermal plume associated with release of water will be very localised. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf|EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf]]:97: cooling water, which may lead to an increase in the turbidity and water temperature near the discharge point. However, modelling of the thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf|EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf]]:97: resulting from discharge of heated cooling water has demonstrated that the plume is likely to be very localised (see paragraphs 4.3.19 – 4.3.22). Therefore, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf|EN010103-002508-NZT DCO 7.16 - HRA for Change Request (Clean) - Nov 2022 (D12).pdf]]:98: impact pathway has been dismissed. No cooling water discharge erosion effect will occur ‘in combination’ due to the very localised extent of the plume from [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002311-NZT DCO 6.4.49 - ES Vol III Appendix 25A Commitments Register Clean Oct 2022 (D9).pdf|EN010103-002311-NZT DCO 6.4.49 - ES Vol III Appendix 25A Commitments Register Clean Oct 2022 (D9).pdf]]:12: volumes and to assist the dissipation of any plume a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001134-NZT DCO 6.4.45 ES Vol III Appendix 20B- Navigational Risk Assessment Part 1.pdf|EN010103-001134-NZT DCO 6.4.45 ES Vol III Appendix 20B- Navigational Risk Assessment Part 1.pdf]]:16: dissipation of any plume, a diffuser at the outfall head will be retrofitted if the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:18:system scenarios (i.e. alternative outfall) the effluent plume may be discharged (i.e. this is a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:34:Figure 4-2: Deflected Lateral Plume Mixing Zone................................................................................ 22 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:51:that the mixing zone plume can take two different shapes depending on the current flow rate compared [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:51:to the discharge velocity; the plume either forms a vertical mixing zone extending towards the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:51:surface or a lateral plume extending along the direction of the current. The two plume shapes are shown [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:51:the vertical thickness of the plume. These dimensions will be quoted in Section 5 to show the size of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:51:If a vertically rising plume reaches the water surface, then the effluent will spread horizontally at the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:51:plume begins to spread at the surface level. The lateral extent of the surface mixing zone can become [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:51:large under this scenario, although the vertical rising plume thickness remains small. The extent of any [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:52: Figure 4-2: Deflected Lateral Plume Mixing Zone [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:53: Description of Plume Distance from outfall to reaching EQS [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:53: Plume is deflected horizontally a = 1.8 m a = 0.9 m a = 1.3 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:53: Min Plume rises vertically but does a = 0.12 m a = 0.03 m a = 0.05 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:53: Plume is deflected horizontally a = 1.2 m a = 0.9 m a = 1.2 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:53: Min Plume rises vertically but does a = 0.05 m a = 0.03 m a = 0.05 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:53: High Tide Plume rises vertically and only b = 2.6 m b = 1.6 m b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:53: Plume rises vertically but does b = 2.0 m b = 0.3 m b = 2.3 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:54: High Tide Plume rises vertically and b = 3.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:54: High Tide Plume rises vertically and b = 2.0 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:54:always met within a few metres of the outfall and before the plume meets the water surface. A thermal [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:54: Description of Plume Distance from outfall to reaching EQS [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:54: Plume is deflected horizontally [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:55: Plume is deflected horizontally a = 1.2 m a = 0.8 m a = 1.2 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:55: Min Plume rises vertically but does a = 0.05 m a = 0.03 m a = 0.05 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:55: High Tide Plume rises vertically and only b = 2.6 m b = 1.6 m b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:55: Plume rises vertically but does b = 1.7 m b = 1.6 m b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:55: High Tide Plume rises vertically and b = 3.1 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:55: Plume rises vertically but does b = 1.9 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:55:always met within a few meters of the outfall and before the plume meets the water surface. A thermal [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:65:the EQS within a very short distance of the outfall and before the mixing plume reaches the water [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:65:surface. Thermal effects are also extremely small, with the temperature of the mixing plume falling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:65:below 3°C above ambient condition within a very short distance and usually before the plume reaches [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:75:Results of near-field thermal plume modelling undertaken using the CORMIX modelling software show [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:75:that, for Outfall 1 under spring conditions, the likely extent of a thermal plume (with a 15°C excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:75:extent of the plume increases to 140 m. Considering a further reduced excess temperature shows that [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:75:and 720 m on an ebb. In all cases tested, the mixing and plume dispersion appear to occur very rapidly [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:75:outfall plume, the neap tidal phases offer a larger plume, with the 2°C contour extending 600 m and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:75:Far field plume dispersion modelling using the Delft3D model shows a small impact of outfall discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:76: 1.1 Near-field thermal plume modelling ..................................................................................................2 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:76: 1.2 Far-field thermal plume modelling ......................................................................................................2 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:77:Table 10. Thermal plume properties in Delft3D, summer and winter case .......................................... 17 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:77:Figure 14. Spring and neap flood tide plume variations during normal discharge events. ............ 13 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:77:Figure 15. Spring and neap ebb tide plume variations during normal discharge events. ............... 14 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:80:Figure 82. Spring and neap flood tide plume variations during extreme discharge events. .......... 91 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:80:Figure 83. Spring and neap ebb tide plume variations during normal discharge events. ............... 92 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:81:AECOM Ltd. have commissioned ABPmer to undertake hydrodynamic and thermal plume modelling of [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:83:  Near-field thermal plume modelling at two different outfall locations; and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:83:  Far-field 3D thermal plume modelling. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:83:1.1 Near-field thermal plume modelling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:83:model to construct thermal plume simulations using the MixZon Inc. CORMIX modelling software. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:83:quantify the possible extent of a plume from both outfall locations with particular thermal properties. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:83:1.2 Far-field thermal plume modelling [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:83:Section 2: CORMIX Modelling – Outfall 1: Provides details of the thermal plume model setup and [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:83:Section 3: CORMIX Modelling – Outfall 2: Provides details of the updated thermal plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:85:CORMIX thermal plume modelling, as described in the following sections. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:88:flood and ebb conditions as in Table 1) and shows the ebb plume (Run 10) to better maintain its excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:88:Shown in Figure 7 is the plume sensitivity to winds. The summer wind value of 4.08 m/s is a light wind [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:88:and doesn’t appear to have any influence on the plume when comparing runs 01 and 03. When a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:88:significantly stronger wind of 15 m/s is applied (Run 16), the plume is slightly affected causing the excess [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:89:Figure 8 shows the tests addressing the plume sensitivity to the discharge port diameter. The baseline [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:89:Figure 9 shows the plume sensitivity to projection of the outfall port. Run 01 has a vertical projection [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:92:As stated in Section 2, CORMIX modelling, assessing the near-field impact of the of thermal plume has [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:104:In order to test the sensitivity of the plume discharge to wind directions, two further simulations have [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:104: differences in the distribution of the thermal plume: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:104:  When a south easterly (120°) wind is applied to the summer thermal plume discharge scenario [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:104: the effect is to reduce the eastern extent of the thermal plume. This is more pronounced in the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:104: neap comparisons where flow speeds are lower and the along-coast extent of the plume is [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:109:the Outfall 1 site are consistently higher which may be contributing to faster dispersion of the plume as [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:109:This plot shows the along shore flow directing the plume discharge into the estuary. Plot Figure 29 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:Near-field thermal plume modelling has been undertaken using the CORMIX modelling software to [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:conditions, the likely extent of a thermal plume (of the properties modelled) would be very localised: a [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:m on the ebb. Considering a 2°C temperature excess the ebb extent of the plume increases to 140 m, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:To examine the wider plume dispersion a 0.1°C temperature excess contour was exported from CORMIX. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:allow the plume to stay buoyant for longer, however the excursion from the plume would be limited by [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:Sensitivity testing showed only a small influence on plume extent due to wind and seasonal variations, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:the plume. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:outfall plume, the neap tidal phases offer a larger plume, when compared to the spring tide, under [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:normal discharge conditions. In particular, the neap flood tide offers the largest plume extent as [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:However, it is to be noted that the CORMIX model assumes full plume development under the given [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:enough for a fully developed plume (as defined) to form. As the flows reduce, either side of the peak [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:conditions modelled, and turn with the tidal phase, further dissipation of the plume is expected before [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:Far field plume dispersion modelling has been undertaken using the Delft3D modelling software using [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:117:Temperature excess plots of the plume impact have shown a small impact of the outfall discharge on [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:124:thermal plume or contamination modelling. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:172:Figure 82 shows the downstream temperature excess of the resultant plume during a spring (run 26) [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:172:characteristics again result in a more extensive plume, reducing the excess temperature at a slower rate [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:172:Figure 82. Spring and neap flood tide plume variations during extreme discharge events. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:204:concentrations are diluted to below the EQS. Mixing zone plumes in CORMIX are modelled over [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:204:period of mixing when the plume reaches the water surface and spreads laterally (the surface spreading [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:204:while dilution during the surface spreading stage is more dominated by diffusion of the plume into the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:204:zone plumes in different ways depending on the current conditions specified: [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:204: pair of ports and resolve the dimensions of the resulting three individual plumes (Figure 4-2). [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:205: resolve individual mixing plumes for each pair of outfalls, although the plumes are significantly [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:205: of each plume and for the surface spreading stage. The plumes combine and become vertically [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:205: 0.271 m/s respectively) the plumes undergo rapid lateral mixing at the point of discharge. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:205: CORMIX represents this by combining the plumes into a single mixing zone for both the vertical [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:205:mixing plume above the outfall, the lateral distance travelled by the plume and the cross section width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:205:of the mixing zone plume at the point when the EQS is reached. If the EQS is met in the surface [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:206:plume rising stage. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:206: Plume Cross Section Width 1.9 0.5 1.0 0.6 0.9 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:206: Plume Cross Section Width 15 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:206: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:206: Plume Cross Section Width 1.8 0.4 0.5 0.3 0.5 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:206: Plume Cross Section Width 1.9 0.5 1.0 0.4 0.3 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:206: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:206: Plume Cross Section Width 15 immediately on discharge [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:206: Plume Cross Section Width 1.8 0.4 0.8 0.3 0.3 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:206:The results in Table 4-3 show that EQS values for all substances are met within the plume rising stage [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:207:scenario is 0.34 m/s and the EQS for all substances are met during the plume rising stage. Results are [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:208: Plume Cross Section Width 0.6 discharge 0.7 0.6 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:208: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:208: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:208: Plume Cross Section Width 0.6 discharge 0.7 0.6 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:208: Plume Cross Section Width 0.6 discharge 0.7 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:208: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:208: Plume Cross Section Width [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:208: Plume Cross Section Width 0.6 discharge 0.7 [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:217:plume reaches the water surface. Thermal effects are also extremely small, with the temperature of the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf|EN010103-002322-NZT DCO 9.36 - Nutrient Nitrogen Briefing Paper Clean Oct 2022 (D9).pdf]]:217:mixing plume falling below 3°C above ambient conditions within a very short distance. Surface [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:24: plumes, stacks and high levels of lighting at night-time associated with the industrial [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:26: industrial complexes and structures including stacks, chimneys and plumes. The [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:40:associated plume from the absorber stack appearing against the high ground in the distance. The [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:40:structures and plumes will be visible, viewed within a context of existing large-scale structures as part [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:41:Long distance view towards the operational PCC Site. The structures, stacks and plume associated [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:42:intervening landform and vegetation. The larger structures, stacks and plume associated with the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:43:Medium range view towards the operational PCC Site. The structures, stacks and plume associated [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:44:The majority of the high level structures, stacks and plume associated with the absorber stack will [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:45:including stacks and plume associated with the absorber stack will be viewed against the skyline, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:46:Medium distance views of the operational PCC Site, including stacks and plume associated with the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:47:At opening the operational PCC Site will be visible in the view. The stacks and plume associated with [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:48:The operational PCC Site will be clearly visible in the view. The stacks and plume associated with the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:49:intervening structures located in close proximity to the PCC Site. The stacks and plume would form [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:50:The operational PCC Site will be visible to the left of the centre of the view. The stacks and plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:50:a high number of industrial structures including stacks and plumes. The Proposed Development [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:51:The upper sections of the operational PCC Site at opening including stacks and plume associated [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:51: Visible Plumes [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:51: ecological receptors: 35°C and 60°C release. The average visible plume [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:51: 40% of the time reducing to approximately 4% of the time for a plume over [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:52: 115 m in length (i.e. the height of the stack). An average plume length of 1 m [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:52:17.6.18 As such the visual impact associated with visible plumes from a 35°C release [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:52:17.6.19 In addition to the potential for visible plumes to occur from the absorber stack, [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:52: there is also potential for visible plumes to occur from the mechanical draft [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:52: cooling towers (22 cooling cells). Plumes will be present for up to 85% of the [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:52: time with an average length of 15 m. Visible plumes over 100 m are only [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:52: visible plumes from existing stacks and chimneys. [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf|EN010103-000909-NZT DCO 6.2.17 ES Vol I Chapter 17 Landscape and Visual Amenity.pdf]]:55: road corridors. Where views are open, the stacks and associated plumes will [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002409-NZT DCO - 9.45 Written Summary of Oral Submission for ISH6 - Oct 2022 (D11).pdf|EN010103-002409-NZT DCO - 9.45 Written Summary of Oral Submission for ISH6 - Oct 2022 (D11).pdf]]:7: Plume modelling of the outfall discharge has been undertaken and this has demonstrated that the discharged [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-002636-NZT DCO 8.5 - EA SoCG - Final (signed) - Oct 2022 (D13).pdf|EN010103-002636-NZT DCO 8.5 - EA SoCG - Final (signed) - Oct 2022 (D13).pdf]]:11: plume impacts, emissions to air and the emerging BAT [[this>Infrastructure/projects/north-east/the-net-zero-teesside-project/EN010103-001576-NZT DCO 9.3 - Written Summary ISH2 - May 2022.pdf|EN010103-001576-NZT DCO 9.3 - Written Summary ISH2 - May 2022.pdf]]:21: dispersion of the plume from the stack on top of the tower and this has been used [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000211-EN010082-5.5-Planning Statement-Final-November 2017.pdf|EN010082-000211-EN010082-5.5-Planning Statement-Final-November 2017.pdf]]:44: • measures to be employed in preventing or mitigating the emissions. assesses the potential for visible plumes. It concludes that visible plumes will occur rarely, less [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000012-Scoping Opinion.pdf|EN010082-000012-Scoping Opinion.pdf]]:39: more prominent structures and plume) in the landscape and visual [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000654-TEES Final Recommendation Report and Errata.pdf|EN010082-000654-TEES Final Recommendation Report and Errata.pdf]]:69: • Potential visibility of plumes from the stacks and cooling towers at [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000174-EN010082-6.2.3-ES Chapter 3-EIA Approach-Final-November 2017.pdf|EN010082-000174-EN010082-6.2.3-ES Chapter 3-EIA Approach-Final-November 2017.pdf]]:15: Plumes: visual intrusiveness of plumes Hybrid cooling tower technology will be used which [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000174-EN010082-6.2.3-ES Chapter 3-EIA Approach-Final-November 2017.pdf|EN010082-000174-EN010082-6.2.3-ES Chapter 3-EIA Approach-Final-November 2017.pdf]]:15: from cooling towers will have a much reduced visual plume than the [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000174-EN010082-6.2.3-ES Chapter 3-EIA Approach-Final-November 2017.pdf|EN010082-000174-EN010082-6.2.3-ES Chapter 3-EIA Approach-Final-November 2017.pdf]]:15: original cooling tower plumes (associated with the [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000581-8.61 - Tees CCPP - Stack Diameter Sensitivity Study.pdf|EN010082-000581-8.61 - Tees CCPP - Stack Diameter Sensitivity Study.pdf]]:3:1.4 The dispersion of the plume is driven by three principal factors: [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000581-8.61 - Tees CCPP - Stack Diameter Sensitivity Study.pdf|EN010082-000581-8.61 - Tees CCPP - Stack Diameter Sensitivity Study.pdf]]:3:  the temperature of the plume which provides the initial thermal buoyancy; [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000581-8.61 - Tees CCPP - Stack Diameter Sensitivity Study.pdf|EN010082-000581-8.61 - Tees CCPP - Stack Diameter Sensitivity Study.pdf]]:3:  the exit velocity of the plume which provides the initial momentum. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000397-8 6 - Tees CCP - Applicant's Response to ExA's WQs - Deadline 2 - FINAL.pdf|EN010082-000397-8 6 - Tees CCP - Applicant's Response to ExA's WQs - Deadline 2 - FINAL.pdf]]:12:Q1.1.22 Applicant Paragraph 7.120 of the ES [[APP-049]] indicates that for visible plumes the The assessment of visible plumes is not a commonplace requirement, and Aermod does not have this model capability. ADMS was [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000397-8 6 - Tees CCP - Applicant's Response to ExA's WQs - Deadline 2 - FINAL.pdf|EN010082-000397-8 6 - Tees CCP - Applicant's Response to ExA's WQs - Deadline 2 - FINAL.pdf]]:12: ADMS model has been used for the exercise using the same set up as the therefore used to assess visible plumes as this does have this capability. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000397-8 6 - Tees CCP - Applicant's Response to ExA's WQs - Deadline 2 - FINAL.pdf|EN010082-000397-8 6 - Tees CCP - Applicant's Response to ExA's WQs - Deadline 2 - FINAL.pdf]]:12: why the ADMS model was used. ADMS and Aermod are based upon the same Gaussian Plume Dispersion equations. There are some differences in the processing of [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000397-8 6 - Tees CCP - Applicant's Response to ExA's WQs - Deadline 2 - FINAL.pdf|EN010082-000397-8 6 - Tees CCP - Applicant's Response to ExA's WQs - Deadline 2 - FINAL.pdf]]:12: terrain and buildings; however, for the plume visibility modelling, these effects do not need to be modelled and therefore there is [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000216-EN010082-5.1-Consultation Report-Final-November 2017.pdf|EN010082-000216-EN010082-5.1-Consultation Report-Final-November 2017.pdf]]:75: he potential for visible plumes. It concludes that visible plumes will occur rarely, less [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000216-EN010082-5.1-Consultation Report-Final-November 2017.pdf|EN010082-000216-EN010082-5.1-Consultation Report-Final-November 2017.pdf]]:77: assesses the potential for visible plumes. It concludes that visible plumes will occur Description and Alternatives (Ref [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000216-EN010082-5.1-Consultation Report-Final-November 2017.pdf|EN010082-000216-EN010082-5.1-Consultation Report-Final-November 2017.pdf]]:107: – The stacks produce minimal visible plume [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000216-EN010082-5.1-Consultation Report-Final-November 2017.pdf|EN010082-000216-EN010082-5.1-Consultation Report-Final-November 2017.pdf]]:107: – The cooling tower technology selected is regarded as Best Available Technology for plume abatement. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000654-TEES Final Recommendation Report and Errata (1).pdf|EN010082-000654-TEES Final Recommendation Report and Errata (1).pdf]]:69: • Potential visibility of plumes from the stacks and cooling towers at [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000350-Placeholder for ExA's Written Questions.pdf|EN010082-000350-Placeholder for ExA's Written Questions.pdf]]:7:Q1.1.22 Applicant Paragraph 7.120 of the ES [[APP-049]] indicates that for visible plumes the ADMS model has been used [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000212-EN010082-5.6-Design Access Statement-Final-November 2017.pdf|EN010082-000212-EN010082-5.6-Design Access Statement-Final-November 2017.pdf]]:19: • steam plume. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000212-EN010082-5.6-Design Access Statement-Final-November 2017.pdf|EN010082-000212-EN010082-5.6-Design Access Statement-Final-November 2017.pdf]]:20: (each with a emissions stack). Each single shaft power train will have a plume abated hybrid [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:21: impact on dispersion of emissions, in terms of funnelling of plumes and [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:24: drawn down to ground level. This phenomenon can bring the plume from the [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51:7.4.6 Visible Plumes [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51:7.120 The project has the potential to result in the emission of visible plumes. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51: Normally, water vapour in the plume which is generated as a combustion [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51: product will be in vapour phase as the plume temperature decreases. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51: may condense into droplets forming visible plumes. The potential for visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51: plumes has been assessed using dispersion modelling, based upon the water [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51: content of the plume. The ADMS model has been used for this exercise, using [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51:7.121 The results of the visible plume assessment are set out in Table 7.18. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51:Table 7.18 Predicted Occurrence of Visible Plumes [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51: plume visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51: plume visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51: plumes when visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51: Average length of plume m 41 86 49 67 61 61 [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf|EN010082-000380-6.2.7 - Tees CCPP - ES Chapter 7 Air Quality - tracked Rev 2 with figures.pdf]]:51:7.122 The results show that visible plumes will occur rarely, less than 1% of the [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000517-8.43 - Tees CCPP - Written Summary of Oral Case - Env Matters ISH - FINAL - 05.07.18.pdf|EN010082-000517-8.43 - Tees CCPP - Written Summary of Oral Case - Env Matters ISH - FINAL - 05.07.18.pdf]]:8: plume downwash. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000517-8.43 - Tees CCPP - Written Summary of Oral Case - Env Matters ISH - FINAL - 05.07.18.pdf|EN010082-000517-8.43 - Tees CCPP - Written Summary of Oral Case - Env Matters ISH - FINAL - 05.07.18.pdf]]:8: building could mean the plume would then interact with the buildings on the Site and downwash effects [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:22: impact on dispersion of emissions, in terms of funnelling of plumes and [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:24: drawn down to ground level. This phenomenon can bring the plume from the [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51:7.4.6 Visible Plumes [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51:7.120 The project has the potential to result in the emission of visible plumes. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51: Normally, water vapour in the plume which is generated as a combustion [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51: product will be in vapour phase as the plume temperature decreases. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51: may condense into droplets forming visible plumes. The potential for visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51: plumes has been assessed using dispersion modelling, based upon the water [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51: content of the plume. The ADMS model has been used for this exercise, using [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51:7.121 The results of the visible plume assessment are set out in Table 7.18. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51:Table 7.18 Predicted Occurrence of Visible Plumes [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51: plume visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51: plume visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51: plumes when visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51: Average length of plume m 41 86 49 67 61 61 [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf|EN010082-000374-6.2.7 - Tees CCPP - ES Chapter 7 - Air Quality - clean Rev 2 with figures.pdf]]:51:7.122 The results show that visible plumes will occur rarely, less than 1% of the [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000182-EN010082-6.2.11-ES_Chapter 11-Land and Visual Amenity-Final-November 2017.pdf|EN010082-000182-EN010082-6.2.11-ES_Chapter 11-Land and Visual Amenity-Final-November 2017.pdf]]:6: more prominent structures and plume) in the landscape and visual buildings. The 5km study [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000182-EN010082-6.2.11-ES_Chapter 11-Land and Visual Amenity-Final-November 2017.pdf|EN010082-000182-EN010082-6.2.11-ES_Chapter 11-Land and Visual Amenity-Final-November 2017.pdf]]:32: • potential visibility of plumes from the stacks and cooling towers at certain [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000290-EN010082-6.2.11-ES_Chapter 11-Land and Visual Amenity-Rev 2 -January 2018.pdf|EN010082-000290-EN010082-6.2.11-ES_Chapter 11-Land and Visual Amenity-Rev 2 -January 2018.pdf]]:6: more prominent structures and plume) in the landscape and visual buildings. The 5km study [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000290-EN010082-6.2.11-ES_Chapter 11-Land and Visual Amenity-Rev 2 -January 2018.pdf|EN010082-000290-EN010082-6.2.11-ES_Chapter 11-Land and Visual Amenity-Rev 2 -January 2018.pdf]]:32: • potential visibility of plumes from the stacks and cooling towers at certain [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000378-5.6 - Tees CCPP - Design & Access Statement - tracked Rev 3.pdf|EN010082-000378-5.6 - Tees CCPP - Design & Access Statement - tracked Rev 3.pdf]]:20: • steam plume. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000378-5.6 - Tees CCPP - Design & Access Statement - tracked Rev 3.pdf|EN010082-000378-5.6 - Tees CCPP - Design & Access Statement - tracked Rev 3.pdf]]:21: (each with a emissions stack). Each single shaft power train will have a plume abated hybrid [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000381-6.2.11 - Tees CCPP - ES Chapter 11 LVIA - tracked Rev 3 with figures.pdf|EN010082-000381-6.2.11 - Tees CCPP - ES Chapter 11 LVIA - tracked Rev 3 with figures.pdf]]:6: more prominent structures and plume) in the landscape and visual buildings. The 5km study [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000381-6.2.11 - Tees CCPP - ES Chapter 11 LVIA - tracked Rev 3 with figures.pdf|EN010082-000381-6.2.11 - Tees CCPP - ES Chapter 11 LVIA - tracked Rev 3 with figures.pdf]]:31: • potential visibility of plumes from the stacks and cooling towers at certain [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000375-6.2.11 - Tees CCPP - ES Chapter 11 - LVIA - clean Rev 3 with figures.pdf|EN010082-000375-6.2.11 - Tees CCPP - ES Chapter 11 - LVIA - clean Rev 3 with figures.pdf]]:6: more prominent structures and plume) in the landscape and visual buildings. The 5km study [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000375-6.2.11 - Tees CCPP - ES Chapter 11 - LVIA - clean Rev 3 with figures.pdf|EN010082-000375-6.2.11 - Tees CCPP - ES Chapter 11 - LVIA - clean Rev 3 with figures.pdf]]:31: • potential visibility of plumes from the stacks and cooling towers at certain [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:3:3.3 VISIBLE PLUMES 6 [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:8: quality (construction dust and operational emissions), noise, visible plumes [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:11:3.3 VISIBLE PLUMES [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:11:1.31 The project has the potential to result in the emission of visible plumes during [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:11: operation. Normally, water vapour in the plume which is generated as a [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:12: combustion product will be in vapour phase as the plume temperature [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:12: high water may condense into droplets forming visible plumes. The potential [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:12: for visible plumes has been assessed using dispersion modelling, based upon [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:12: the water content of the plume. The ADMS model has been used for this [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:12: the Environmental Statement. The results show that visible plumes will occur [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf|EN010082-000215-EN010082-5.9-Statutory Nuisance Statement-Final-November 2017.pdf]]:13: significant effects are air quality, noise, visible plumes and lighting. However, [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000192-EN010082-6.3.2-ES Annex B-Scoping Opinion-Final-November 2017.pdf|EN010082-000192-EN010082-6.3.2-ES Annex B-Scoping Opinion-Final-November 2017.pdf]]:41: more prominent structures and plume) in the landscape and visual [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000654-TEES Final Recommendation Report and Errata (2).pdf|EN010082-000654-TEES Final Recommendation Report and Errata (2).pdf]]:69: • Potential visibility of plumes from the stacks and cooling towers at [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000372-5.6 - Tees CCPP - Design & Access Statement - clean Rev 3.pdf|EN010082-000372-5.6 - Tees CCPP - Design & Access Statement - clean Rev 3.pdf]]:20: • steam plume. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000372-5.6 - Tees CCPP - Design & Access Statement - clean Rev 3.pdf|EN010082-000372-5.6 - Tees CCPP - Design & Access Statement - clean Rev 3.pdf]]:21: (each with a emissions stack). Each single shaft power train will have a plume abated hybrid [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:22: impact on dispersion of emissions, in terms of funnelling of plumes and [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:24: drawn down to ground level. This phenomenon can bring the plume from the [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51:7.4.6 Visible Plumes [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51:7.120 The project has the potential to result in the emission of visible plumes. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51: Normally, water vapour in the plume which is generated as a combustion [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51: product will be in vapour phase as the plume temperature decreases. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51: may condense into droplets forming visible plumes. The potential for visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51: plumes has been assessed using dispersion modelling, based upon the water [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51: content of the plume. The ADMS model has been used for this exercise, using [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51:7.121 The results of the visible plume assessment are set out in Table 7.18. [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51:Table 7.18 Predicted Occurrence of Visible Plumes [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51: plume visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51: plume visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51: plumes when visible [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51: Average length of plume m 41 86 49 67 61 61 [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf|EN010082-000178-EN010082-6.2.7-ES Chapter 7-Air Quality-Final-November 2017.pdf]]:51:7.122 The results show that visible plumes will occur rarely, less than 1% of the [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000654-TEES Final Recommendation Report and Errata (3).pdf|EN010082-000654-TEES Final Recommendation Report and Errata (3).pdf]]:69: • Potential visibility of plumes from the stacks and cooling towers at [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000510-CONSULTATION REPORT FOR NON-MATERIAL CHANGE.pdf|EN010082-000510-CONSULTATION REPORT FOR NON-MATERIAL CHANGE.pdf]]:26: Air Quality effects are most prominent where the plume is substantially [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000510-CONSULTATION REPORT FOR NON-MATERIAL CHANGE.pdf|EN010082-000510-CONSULTATION REPORT FOR NON-MATERIAL CHANGE.pdf]]:27: (IRCE), Doc Ref: 8.3, which replicates building height information from the present). In this case, the plume rise (due to plume momentum [[this>Infrastructure/projects/north-east/tees-ccpp/EN010082-000510-CONSULTATION REPORT FOR NON-MATERIAL CHANGE.pdf|EN010082-000510-CONSULTATION REPORT FOR NON-MATERIAL CHANGE.pdf]]:27: Preliminary Environmental Impact Report (PEIR) and Environmental and buoyancy) is sufficient to lift the plume clear of the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:64: between sediment plumes created during capital dredging (with potential effects on food [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:64: between sediment plumes created during capital dredging (with potential effects on prey [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:78: phase noise disturbance, creation of a sediment plume during capital dredging and changes to the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:78: disturbance, creation of a sediment plume during capital dredging and changes to the hydrodynamic [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:79: sediment plume during construction and changes to the hydrodynamic and sedimentary regime [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:87: spatial extent of sediment plume. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:88: activity. The plume dispersion modelling predicted no average increase in suspended sediment [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:100: clarity, with a plume of sediment being dispersed along the axis of the navigation channel. The [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:100:10.4.9 The sediment plume within the Tees is likely to affect birds that feed on small fish in the water column, [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:100: with some redistribution in feeding activity likely to occur. The sediment plume modelling has predicted [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:100: the sediment plume as currently predicted by the EIA studies undertaken to date. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:127:11.4.16 The potential for an interaction between sediment plumes that are predicted to be generated by capital [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:128: of the plume. The effect is, therefore, additive rather than cumulative. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:128: a combined plume (in the zone of interaction) is not likely to result is a different behavioural response in [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf|TR030002-000571-Doc 7.3 Appendix 3 - Habitats Regulation Assessment Sept 2014.pdf]]:128: plume from capital dredging. It should be noted that it is highly unlikely that maintenance dredging [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000801-Document 6.8B - Governance Tracker.pdf|TR030002-000801-Document 6.8B - Governance Tracker.pdf]]:8:14 The main mitigation measure to limit sediment plume is selection of the dredge method. Contaminated Deemed Marine Licence (Schedule 5) [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000801-Document 6.8B - Governance Tracker.pdf|TR030002-000801-Document 6.8B - Governance Tracker.pdf]]:8: the water column. Other measures to limit the sediment plume generation comprise limiting the swing [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000470-Section 6 App 6.4 CEMP.pdf|TR030002-000470-Section 6 App 6.4 CEMP.pdf]]:19:12 The main mitigation measure to limit sediment plume is selection of the dredge method. Contaminated sediments are to be dredged using an [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000470-Section 6 App 6.4 CEMP.pdf|TR030002-000470-Section 6 App 6.4 CEMP.pdf]]:19: the sediment plume generation comprise limiting the swing of the backhoe over water, thereby reducing the time when sediment can leak out of [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000503-Section 20 App 20.3 Visual assessment.pdf|TR030002-000503-Section 20 App 20.3 Visual assessment.pdf]]:7: vapour plumes drawing the eye. to the view. phase [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000503-Section 20 App 20.3 Visual assessment.pdf|TR030002-000503-Section 20 App 20.3 Visual assessment.pdf]]:8: vapour plumes drawing the eye. and would form a minor change to the phase: [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000459-ES Section 24 References.pdf|TR030002-000459-ES Section 24 References.pdf]]:2:CIRIA (2000). Scoping the assessment of sediment plumes from dredging. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000463-Section 4 App 4.2 Scoping Opinion.pdf|TR030002-000463-Section 4 App 4.2 Scoping Opinion.pdf]]:83:16. TELEMAC-3D and SEDPLUME are suitable for the modelling proposed but the ES [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf|TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf]]:12: extent of sediment plume. Predicted mean concentration increases of suspended sediment outside the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf|TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf]]:13: release of contaminated material during the capital dredging. Hence the results of the sediment plume [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf|TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf]]:13: dredging activity. The plume dispersion modelling predicted no average increase in suspended [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf|TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf]]:23: clarity, with a plume of sediment being dispersed along the axis of the navigation channel. The [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf|TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf]]:23:10.4.10 The sediment plume within the Tees is likely to affect birds that feed on small fish in the water column, [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf|TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf]]:23: with some redistribution in feeding activity likely to occur. The sediment plume modelling has predicted [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf|TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf]]:30:11.3.9 The potential for an interaction between sediment plumes that are predicted to be generated by capital [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf|TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf]]:30: of the plume for the Harbour facilities. The effect, therefore, would be additive rather than cumulative. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf|TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf]]:31: a combined plume (in the zone of interaction) is not likely to result in a different behavioural response in [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf|TR030002-000675-Doc 6.3 Habitats Regulations Assessment_2 of 2.pdf]]:31: arising from maintenance dredging to interact with a sediment plume from capital dredging. It should [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:10: sediment plumes created by capital dredging and the offshore disposal of dredged [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:26: only), structure and and plume effects from the disposal are not anticipated to enter the water body. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:28:  The dredging plume is not predicted to enter into this water body. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:28:  The dredging plume is not predicted to enter into this water body. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:36: plume does not reached Seal Sands (see Section 5 of the ES) and therefore no impacts on the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:37:4.1.19 Impacts on protected areas are not anticipated in relation to designated bathing waters as the plume is [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:37: plume will not extend onto Seal Sands and therefore impacts on nutrient concentrations within Seal [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:37: during dredging. As discussed with Section 11 of the ES, sediment plumes induced by dredging are [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:41: geological material which does not carry a corresponding impact on plumes associated with [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:42: (EQS) failures. plumes associated with [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf|TR030002-000464-Section 4 App 4.3 WFD compliance assessment.pdf]]:45:Potential The potential release of suspended solids In general, sediment plumes induced by dredging are Given that the potential changes are unlikely to be [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000710-York Potash Limited (Document 6.8A).pdf|TR030002-000710-York Potash Limited (Document 6.8A).pdf]]:9:14 The main mitigation measure to limit sediment plume is selection of the dredge method. Contaminated Deemed Marine Licence (Schedule 5) [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000710-York Potash Limited (Document 6.8A).pdf|TR030002-000710-York Potash Limited (Document 6.8A).pdf]]:9: the water column. Other measures to limit the sediment plume generation comprise limiting the swing [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000453-ES Section 18 Infrastructure.pdf|TR030002-000453-ES Section 18 Infrastructure.pdf]]:15:18.5.17 The results of the sediment plume dispersion modelling for a backhoe dredger and CSD, presented and [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000453-ES Section 18 Infrastructure.pdf|TR030002-000453-ES Section 18 Infrastructure.pdf]]:16:18.5.18 The results of the sediment plume dispersion modelling undertaken for the TSHD show that mean [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000453-ES Section 18 Infrastructure.pdf|TR030002-000453-ES Section 18 Infrastructure.pdf]]:16: outlined within Section 7.5 (with regard to minimising sediment plume dispersion during dredging) [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf|TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf]]:3:chimney stacks and vapour plumes are visible at Teesside. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf|TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf]]:4:dryer stack becomes slightly more noticeable when the vapour plume is being emitted) and have negligible [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf|TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf]]:4:Boulby Mine Top of dryer stack and associate plume distantly visible against the sea at a [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf|TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf]]:5:Boulby Mine The top of the dryer stack and plume are only just visible to the south east, [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf|TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf]]:8:dryer stack, along with associate vapour plume, is visible above the undulating land/ sea horizon in the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf|TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf]]:8:dryer stack edge landform to the north, very small scale feature within the view, plume [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf|TR030002-000547-Doc 6.6 App 22.2 Representative viewpoint assessment.pdf]]:14:(18km) discernible within the view although the plume increase visibility slightly. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000446-ES Section 11 Fisheries and fishing activity.pdf|TR030002-000446-ES Section 11 Fisheries and fishing activity.pdf]]:25: behavioural effects. In general, sediment plumes induced by dredging are considered to pose only a [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000446-ES Section 11 Fisheries and fishing activity.pdf|TR030002-000446-ES Section 11 Fisheries and fishing activity.pdf]]:26: backhoe dredging. Other measures that limit plume generation comprise limiting the swing of the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000446-ES Section 11 Fisheries and fishing activity.pdf|TR030002-000446-ES Section 11 Fisheries and fishing activity.pdf]]:47: over water. Reduction in sediment plume gen [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000564-Doc 6.8 Governance Tracker.pdf|TR030002-000564-Doc 6.8 Governance Tracker.pdf]]:9:12 The main mitigation measure to limit sediment plume is selection of the dredge method. Contaminated MMO Licence Sch 4 [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000564-Doc 6.8 Governance Tracker.pdf|TR030002-000564-Doc 6.8 Governance Tracker.pdf]]:9: the water column. Other measures to limit the sediment plume generation comprise limiting the swing [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000722-York Potash Limited 4.pdf|TR030002-000722-York Potash Limited 4.pdf]]:7:  modelling of sediment plume released from construction activities; [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000722-York Potash Limited 4.pdf|TR030002-000722-York Potash Limited 4.pdf]]:11:  reduction of sediment plumes during backhoe dredging can be achieved by using an [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000738-York Potash Limited 3.pdf|TR030002-000738-York Potash Limited 3.pdf]]:8:  modelling of sediment plume released from construction activities; [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000738-York Potash Limited 3.pdf|TR030002-000738-York Potash Limited 3.pdf]]:10:  reduction of sediment plumes during backhoe dredging can be achieved by using an [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000673-Doc 6.1 Consultation Statement Appendices - 22 to 31.pdf|TR030002-000673-Doc 6.1 Consultation Statement Appendices - 22 to 31.pdf]]:41: backhoe dredger. The MMO would expect the full details of the sediment plume modelling to be included in the final ES i.e. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000492-Section 13 App 13.1 Air quality assessment methodology.pdf|TR030002-000492-Section 13 App 13.1 Air quality assessment methodology.pdf]]:43: dispersion model based on the Gaussian theory of plume dispersion and was developed by the United [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000410-ExA First Round Questions.pdf|TR030002-000410-ExA First Round Questions.pdf]]:21:Sediment plume modelling data [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000410-ExA First Round Questions.pdf|TR030002-000410-ExA First Round Questions.pdf]]:21:The marine sediment and water quality assessment uses the sediment plume [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000410-ExA First Round Questions.pdf|TR030002-000410-ExA First Round Questions.pdf]]:21:concerns on the sediment plume modelling simulations and assessment of [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000455-ES Section 20 Landscape and visual environment.pdf|TR030002-000455-ES Section 20 Landscape and visual environment.pdf]]:9: flare stacks and plumes of steam; and, [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000455-ES Section 20 Landscape and visual environment.pdf|TR030002-000455-ES Section 20 Landscape and visual environment.pdf]]:14: white plumes from the SSI Steel Works form a prominent feature against the sky. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000455-ES Section 20 Landscape and visual environment.pdf|TR030002-000455-ES Section 20 Landscape and visual environment.pdf]]:15: associated buildings, storage areas, flare stacks and vapour plumes. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000455-ES Section 20 Landscape and visual environment.pdf|TR030002-000455-ES Section 20 Landscape and visual environment.pdf]]:24: plumes and emissions being visible in foreground, midground, background and skyline views in most [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000711-Applicants Response to First Questions.pdf|TR030002-000711-Applicants Response to First Questions.pdf]]:65:HWF 1.6 Applicant Sediment plume modelling data [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000711-Applicants Response to First Questions.pdf|TR030002-000711-Applicants Response to First Questions.pdf]]:65: Management assessment uses the sediment plume an estuary-wide sediment regime model using the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000711-Applicants Response to First Questions.pdf|TR030002-000711-Applicants Response to First Questions.pdf]]:65: assessment of impacts on marine water sediment plume model SEDPLUME (originated by HR [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000711-Applicants Response to First Questions.pdf|TR030002-000711-Applicants Response to First Questions.pdf]]:66: sediment regime models. The applicant is SEDPLUME is used to predict the dispersion of sediment [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000711-Applicants Response to First Questions.pdf|TR030002-000711-Applicants Response to First Questions.pdf]]:66: information and provide their comments SEDPLUME model itself. The model accuracy relies [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000711-Applicants Response to First Questions.pdf|TR030002-000711-Applicants Response to First Questions.pdf]]:66: concerns on the sediment plume sediment release source term which is included within the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000711-Applicants Response to First Questions.pdf|TR030002-000711-Applicants Response to First Questions.pdf]]:66: impacts on the marine water quality. operation. To ensure that the plume simulation presents [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000711-Applicants Response to First Questions.pdf|TR030002-000711-Applicants Response to First Questions.pdf]]:105: required for Phase 2 of the development? spatial extent of any sediment plume created by capital [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000711-Applicants Response to First Questions.pdf|TR030002-000711-Applicants Response to First Questions.pdf]]:129: Organisation Compliance Assessment as part of their plume dispersion modelling. Please see our response to [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000497-Section 15 App 15.4 Additional settings assessment report.pdf|TR030002-000497-Section 15 App 15.4 Additional settings assessment report.pdf]]:11: which are manifest as coalescing plumes of white, grey and black vapour. These [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:26: production of a visible plume. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:44: activity is likely to cause increased turbidity in the water column in the form of a ‘plume’ [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:44: within this plume would be dispersed by tidal action and ultimately become deposited on [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:44: of any related plume would be negligible compared with the dredging-related plume. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:45: SEDPLUME model will be used to demonstrate the fate of fine materials released into [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:46: Two sets of flow results will be used to drive the SEDPLUME model. The low [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:46: extent of the sediment plume and the high freshwater flow, neap tide conditions will be [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:46: the plume will be presented as figures to assist in interpretation of the results. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:55: on the designated bathing waters associated with the dredging plume. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:57: The main form of mitigation to limit sediment plume generation due to dredging is [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:62:vicinity of the dredging, dispersion and dilution of the sediment plume would occur and [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:63: section of the EIA, particularly the prediction of sediment plume dispersion during capital [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:74: The main mitigation measure to limit sediment plume generation due to dredging is the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:105:Hydrodynamic • Creation of a sediment plume during dredging and piling works. • Use of TELEMAC-3D flow model to [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf|TR030002-000462-Section 4 App 4.1 Environmental Scoping Report.pdf]]:105: proposed quay structure and deepened berth pocket and • Use of SEDPLUME model to dem [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000444-ES Section 9 Marine and coastal ornithology.pdf|TR030002-000444-ES Section 9 Marine and coastal ornithology.pdf]]:23: into the water column, causing a sediment plume which could potentially affect habitats used by [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000444-ES Section 9 Marine and coastal ornithology.pdf|TR030002-000444-ES Section 9 Marine and coastal ornithology.pdf]]:24: for some species of waterbirds. On the basis of the sediment plume dispersion modelling, no impact is [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000444-ES Section 9 Marine and coastal ornithology.pdf|TR030002-000444-ES Section 9 Marine and coastal ornithology.pdf]]:40:9.9.4 Potential plume effects on the feeding resource and disturbance during the construction phase would [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000444-ES Section 9 Marine and coastal ornithology.pdf|TR030002-000444-ES Section 9 Marine and coastal ornithology.pdf]]:42: Reduction of sediment plumes during backhoe dredgin [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000443-ES Section 8 Marine ecology.pdf|TR030002-000443-ES Section 8 Marine ecology.pdf]]:49:8.5.19 In general, sediment plumes induced by dredging are considered to pose only a limited risk to water [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000443-ES Section 8 Marine ecology.pdf|TR030002-000443-ES Section 8 Marine ecology.pdf]]:49:8.5.21 The sediment plume dispersion plots presented in Section 5.5 illustrate that the footprint of effect on [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000443-ES Section 8 Marine ecology.pdf|TR030002-000443-ES Section 8 Marine ecology.pdf]]:50:8.5.24 The results of the sediment plume modelling undertaken specifically for the proposed scheme are [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000443-ES Section 8 Marine ecology.pdf|TR030002-000443-ES Section 8 Marine ecology.pdf]]:50: intertidal areas. Based on the sediment plume modelling results, no significant indirect impacts on [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000443-ES Section 8 Marine ecology.pdf|TR030002-000443-ES Section 8 Marine ecology.pdf]]:61:suspended during Low Low Negligible Reduction of sediment plumes during backhoe dredgin [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000561-Doc 6.7 Environmental Statement Non Technical Summary_2 of 2.pdf|TR030002-000561-Doc 6.7 Environmental Statement Non Technical Summary_2 of 2.pdf]]:16:2.5.7 The results of sediment plume modelling undertaken for the proposed scheme show that an average [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000561-Doc 6.7 Environmental Statement Non Technical Summary_2 of 2.pdf|TR030002-000561-Doc 6.7 Environmental Statement Non Technical Summary_2 of 2.pdf]]:24: plumes and emissions being visible in foreground, midground, background and in skyline views in most [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000561-Doc 6.7 Environmental Statement Non Technical Summary_2 of 2.pdf|TR030002-000561-Doc 6.7 Environmental Statement Non Technical Summary_2 of 2.pdf]]:32: sediment plume from more than one projects overlap. However, the cumulative impact on fish [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000674-Doc 6.3 Habitats Regulations Assessment_1 of 2.pdf|TR030002-000674-Doc 6.3 Habitats Regulations Assessment_1 of 2.pdf]]:81: sediment plumes created during capital dredging [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000674-Doc 6.3 Habitats Regulations Assessment_1 of 2.pdf|TR030002-000674-Doc 6.3 Habitats Regulations Assessment_1 of 2.pdf]]:81: sediment plumes created during capital dredging [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000674-Doc 6.3 Habitats Regulations Assessment_1 of 2.pdf|TR030002-000674-Doc 6.3 Habitats Regulations Assessment_1 of 2.pdf]]:86: construction phase noise disturbance, creation of a sediment plume during capital dredging and [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000674-Doc 6.3 Habitats Regulations Assessment_1 of 2.pdf|TR030002-000674-Doc 6.3 Habitats Regulations Assessment_1 of 2.pdf]]:86: disturbance, creation of a sediment plume during capital dredging and changes to the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:24: production of a visible plume. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:42: activity is likely to cause increased turbidity in the water column in the form of a ‘plume’ [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:42: within this plume would be dispersed by tidal action and ultimately become deposited on [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:42: of any related plume would be negligible compared with the dredging-related plume. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:43: SEDPLUME model will be used to demonstrate the fate of fine materials released into [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:44: Two sets of flow results will be used to drive the SEDPLUME model. The low [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:44: extent of the sediment plume and the high freshwater flow, neap tide conditions will be [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:44: the plume will be presented as figures to assist in interpretation of the results. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:53: on the designated bathing waters associated with the dredging plume. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:55: The main form of mitigation to limit sediment plume generation due to dredging is [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:60:vicinity of the dredging, dispersion and dilution of the sediment plume would occur and [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:61: section of the EIA, particularly the prediction of sediment plume dispersion during capital [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:72: The main mitigation measure to limit sediment plume generation due to dredging is the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:103:Hydrodynamic • Creation of a sediment plume during dredging and piling works. • Use of TELEMAC-3D flow model to [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf|TR030002-000074-131202_TR030002_York Potash Harbour Facilities_Scoping Report.pdf]]:103: proposed quay structure and deepened berth pocket and • Use of SEDPLUME model to dem [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000072-140113_TR030002_York Potash Harbour Facilities_Scoping Opinion Report.pdf|TR030002-000072-140113_TR030002_York Potash Harbour Facilities_Scoping Opinion Report.pdf]]:81:16. TELEMAC-3D and SEDPLUME are suitable for the modelling proposed but the ES [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf|TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf]]:2:22.2.2 The in-situ sediment with the highest proportion of fine sediment used in the dredging plume [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf|TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf]]:2: descends. This dynamic plume phase restricts the release of fine sediment into the water column to 5- [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf|TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf]]:2: 10% losses of fine sediment from the dynamic plume was assumed. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf|TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf]]:2: the extent of the fine sediment plume expected to arise from disposal operations in the offshore area, a [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf|TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf]]:2: tracking model, SEDPLUME-RW(3D). A source term of 60kg/s of fine sediment was included in the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf|TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf]]:2: by the simulation. Plotting the maximum plume concentration shows the largest concentration [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf|TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf]]:2: plume (i.e. the maximum concentration shown would disperse). [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf|TR030002-000457-ES Section 22 Offshore disposal of dredged material.pdf]]:3: the dynamic plume phase of the disposal operation. Deposition is predicted to be entirely within the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:8: which effects are predicted to occur (e.g. sediment plumes generated during capital dredging and [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:20: sediments and release them into the water column as a plume. This would increase the suspended [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:21: plume modelling was undertaken to predict the effect of dredging due to all potential dredge methods [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:21:7.5.7 The sediment plume simulations for the backhoe dredger predict that an area of elevated suspended [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:21: dredger, with no wider effects within the estuary. The predicted sediment plume for the backhoe [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:21:7.5.9 The sediment plume simulation undertaken for the CSD (see Figure 7-4) indicates an area of elevated [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:24:7.5.11 The sediment plume simulations for the TSHD (see Figure 7-5) predict that an area of elevated [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:24: sediment plume is minimised as far as practicable. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:24:7.5.13 The sediment plume modelling simulations (presented and discussed within Section 5) have shown [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:25:7.5.14 In general, sediment plumes induced by dredging are considered to pose only a limited risk to water [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:25: is minimised during dredging. The main mitigation measure to limit sediment plume is selection of the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:26: dredging. Other measures that limit plume generation comprise limiting the swing of the backhoe over [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000442-ES Section 7 Marine sediment and water quality.pdf|TR030002-000442-ES Section 7 Marine sediment and water quality.pdf]]:32: Reduction of sediment plumes during backhoe dr [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:5:The sediment plumes resultant from the operation of cutter suction and trailer suction hopper [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:6:similar after the development. The centre of the plume of suspended particles is predicted to be [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:6:the plume in the upstream turning circle is predicted for larger tide ranges particularly under [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:14: (mud) sediment. Section 5 describes the studies of the dispersion of sediment plume [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:45: The HR Wallingford developed model SEDPLUME-RW(3D) was used to simulate the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:45: SEDPLUME-RW(3D) uses tidal currents to determine the advection of material within [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:45: caused by sediment plumes. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:45: In the Estuary the SEDPLUME model is driven by flows from the TELEMAC-3D [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:46: Using SEDPLUME-RW(3D) to disperse sediment from dredging operations there are a [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:46: various parameters which would act as input to the sediment plume study as well as [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:52: the plume dispersion modelling are shown in Figure 2.4. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:52: On the spring tide, low flow condition (Figure 5.14), the suspended solids plume leaves [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:52: plume extends upstream of Dabholm Gut, beyond the landward limit of the model’s [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:53: tide under low flow conditions (Figures 5.20 to 5.22), the extent of the plume of [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:53: that the high suspended particle concentrations in the core of the plume are close to the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:53: The HR Wallingford dispersion model SEDPLUME-RW(3D) was used to carry out [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:53: plume simulations for suspended particles released into Dabholm Gut, within the area of [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:53: and proposed port layouts and dredged depths. The plume model was driven by the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:54: the plume of suspended particles tends to be closer to the east bank of the River Tees [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:59: Plume models have been applied to study the fate of material released by the capital [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:59: The sediment plumes resultant from the operation of cutter suction and trailer suction [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf|TR030002-000466-Section 5 App 5.2 Model calibration and validation.pdf]]:60: to be of the whole similar after the development. The core of the plume of suspended [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000437-ES Section 3 Project description_1 of 2.pdf|TR030002-000437-ES Section 3 Project description_1 of 2.pdf]]:34: the spatial extent of the sediment plume). [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000701-Environment Agency.pdf|TR030002-000701-Environment Agency.pdf]]:12:  modelling of sediment plume released from construction activities; [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000701-Environment Agency.pdf|TR030002-000701-Environment Agency.pdf]]:16:  reduction of sediment plumes during backhoe dredging can be achieved by using an [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:10: sediment plume dispersion and deposition onto the seabed during capital dredging [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:251: of sediment plume released from construction activities. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:252: which would create a plume of sediment in the water column which would disperse according to [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:253:25.4.2 The extent of sediment plume created by capital dredging is heavily dependent on the dredging plant [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:253: maximum potential spatial extent of sediment plume generation and deposition footprint has been [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:253: plume dispersion and deposition onto the seabed during capital dredging [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:253: predicted in close proximity to the dredger, with dispersion of the plume resulting in a significantly [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:269:26.4.1 Given that the generation of a sediment plume is a construction phase effect (i.e. would occur during [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:269: represent sediment plume dispersion under specific tidal conditions (to enable a realistic worse case to [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:269: programmes of capital dredging would coincide to result in a scenario where sediment plumes combine [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:269:26.4.2 Analysis of the results presented in Table 25-3 indicates that the sediment plumes arising from [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:269: Harbour facilities alone but within the same plume spatial extent (i.e. the spatial extent of the sediment [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:269: plume predicted for the Harbour facilities would not be altered by interaction with the effects of other [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:269: projects). It should be noted that the sediment plume predicted due to the NGCT encompasses, and [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:269: extends beyond, the area of the plume predicted for the Harbour facilities. The impact is, therefore, [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:270: maintenance dredging to interact with a sediment plume from capital dredging. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:272: plume during capital dredging [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:272: populations is also informed by the sediment plume dispersion studies undertaken for the Harbour [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:274: Effect on fish populations due to creation of a sediment plume during capital dredging [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:274:27.4.8 As discussed in Section 27, there is the potential for the sediment plumes to coincide resulting in an [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:274: zone of increased suspended sediment concentration. However, the effect of a combined plume (in the [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:279: due to creation of a sediment plume during capital dredging) given that waterbirds potentially affected [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf|TR030002-000507-Doc 6.6 Environmental Statement_CIA.pdf]]:279: the effect of a combined plume (in the zone of interaction) is not likely to result in a different behavioural [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf|TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf]]:3:TELEMAC-3D and SEDPLUME are suitable for the modelling proposed but the ES must include [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf|TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf]]:4:The MMO would expect full details of sediment plume modelling to be included in the ES i.e. [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf|TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf]]:6: modelling, sediment transport, bed change modelling and modelling of sediment plume released from [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf|TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf]]:11:5.5.4 Sediment plume modelling tests have been carried out for the proposed scheme to predict the effects [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf|TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf]]:11: flow, spring tide flow simulation was used to demonstrate the maximum extent of the sediment plume [[this>Infrastructure/projects/north-east/york-potash-harbour-facilities-order/TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf|TR030002-000440-ES Section 5 Hydrodynamic and sedimentary regime.pdf]]:11: tide conditions. The findings of the sediment plume modelling are discussed in greater detail below. [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:6: 6.4.6 Plume studies of Dabholm Gut outflow 198 [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:51: • Assess impact of dredge plume and dewatering discharge on interest features. [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:60: undertaking modelling of the dispersion of the sediment plume. The potential effects [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:103: dispersion of sediment plumes during dredging). Further details on the parameters [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:103: used in the sediment plume simulations are provided in Section 6.3.1. [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:195: the studies on the dispersion of the sediment plume arising during dredging, as [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:195: less instantaneous release of solids. Therefore, sediment plume studies were [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:196: remain in suspension, forming a sediment plume. The plume from the overspill [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:196: plume simulations. [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:196: plumes of suspended fine sediment. Importantly the TSHD will result in a [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:196: 7. The HR Wallingford developed model SEDPLUME-RW(3D) was used to [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:196: within the Tees Estuary. SEDPLUME-RW(3D) used tidal currents computed by [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:196: 8. Parameters for the sediment plume simulations for the CSD were established [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:197: 9. Parameters for the sediment plume simulations for the TSHD were established, [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:197: 10. For the EIA investigations the SEDPLUME-RW(3D) model was used to simulate [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:197: because the sediment enters the water firstly in a dynamic plume phase (i.e. not [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:197: sediment mixes with the water it behaves as a passive plume that is transported [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:197: simulations assume that by the passive plume phase occurs at about 1m above [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:203: approximate 1km2 of Seal Sands. The SEDPLUME model assumes that the [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:227:6.4.6 Plume studies of Dabholm Gut outflow [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:227: SEDPLUME-RW(3D). It should be noted that, as a consequence of the [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:227: that following the proposed development the core of the plume of suspended [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:254: described in Section 6.3. Two types of dredger were considered in the plume [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:254: 5. The plume dispersion studies predict that, during the dredging of sand in the [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:294: sediment plume spreads further afield (along the tidal axis) compared to [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:299: 2. In general, sediment plumes induced by dredging are considered to pose only a [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:370: 5. The cross section of the estuary affected by the plume arising from the proposed [[this>RiverTees/Planning/EIA_2017_00041/Additional Documents/NGCT_Final_ES at KK with figs.pdf|NGCT_Final_ES at KK with figs.pdf]]:538:CIRIA (2000) Scoping the assessment of sediment plumes from dredging. CIRIA [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:13:plumes during dredging), particularly as the use of BD typically results in lower environmental impact relative [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:57: SEDPLUME-RW(3D) numerical modelling. Post construction effects were specifically assessed [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:57: modelling of sediment plume released from construction activities. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:59:required) will generate a plume of sediment in the water column. The simulated dredge locations and the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:67:Due to the similarity of the mid to far-field effects of a plume created by the CSD dredging in the upper [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:76:are predicted to occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:91:suspension of sediments and release them into the water column as a plume. This would increase the TSS [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:91:SSC are predicted to occur within the immediate vicinity of the dredger, but the sediment plume spreads [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:92:types of dredger were considered in the plume dispersion studies, namely a CSD dredging mudstone (which [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:93:The plume dispersion studies predict that, during the dredging of sand in the lower channel using a TSHD, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:93:The main mitigation measure to limit sediment plume is selection of the dredging method. As noted above, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:107:hydrodynamic and sedimentary plume modelling undertaken. This section excludes consideration of [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:128:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:128:background) are predicted in the immediate vicinity of the dredger. Sediment plume modelling predicts that [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:156:of sediment into the water column, causing a sediment plume that could potentially affect habitats used by [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:156:estuary. The modelled sediment dispersion plume from the proposed NGCT dredge does not interact with [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:158:plume, the magnitude of the potential effect on feeding birds is predicted to be medium. Based on a receptor [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:159:and impact of the dredged plume, as any plume generated by operations has been predicted (by HR [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:159:the other side. This will allow time for the plume to disperse before operations are moved to a different [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:159:Mitigation of the plume effects by reducing the size of the dredger, and thus reducing the rate of overflow, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:159:barge will be located either on the eastern or western side of the estuary. As with the TSHD, the plume [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:169:occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents during [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:187:variation, in the immediate vicinity of the dredger (see Section 6). Sediment plume modelling has however [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:187:The cross section of the estuary affected by the plume arising from the proposed dredging is particularly [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:188: river. This is to reduce both the extent and impact of the dredged plume, as any plume generated [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:188:Mitigation of the plume effects by reducing the size of the TSHD, and thus reducing the rate of overflow, is [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:188:implementation of this measure will result in the plume from the barge loading operations remaining on one [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:188:to the findings of the sediment plume modelling reporting in Section 6 (which illustrate that the sediment [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:188:plume is predicted to remain within the estuary), results in a conclusion of no impact to fish spawning [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:189:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:189:The cross section of the estuary affected by the plume arising from the proposed dredging is particularly [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:190:and clay, and up to 33 weeks for mudstone), in addition to the relatively localised nature of the plume (in [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:226:Sediment plume modelling predicts that SSC would not increase above background concentrations by more [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:226:The controls outlined in Section 7 (with regard to minimising sediment plume dispersion during dredging) [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:259: influencing the same area as affected by the sediment plume); and, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:260:extent of the dredging and disposal plumes. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:266:All projects scoped into the assessment will involve capital dredging. This activity will create a plume of [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:267:The extent of the sediment plume created by capital dredging is heavily dependent on the dredging plant [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:267:potential spatial extent of sediment plume generation and deposition footprint has been identified from the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:267:sediment in the water column was predicted to be in close proximity to the dredger, with plume dispersion [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:267:resulting in a significantly reduced concentration of suspended sediment beyond the source of the plume. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:268:of the plume for the NGCT scheme. The effect would be additive rather than cumulative (i.e. the predicted [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:271:A cumulative effect on water quality as a result of dredging induced sediment plume generation will only [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:271:In addition, the predictions made for each project (shown in Figures 27.2 to 27.4) represent sediment plume [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:271:coincide to result in a scenario where sediment plumes combine at peak concentration (as predicted by the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:271:The sediment plume predicted due to the NGCT encompasses, and extends beyond, the area of the plume [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:274:due to a sediment plume during capital dredging), given that the waterbirds potentially affected would be [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:274:occur, with movement away from the zone of increased SSC. However, the effect of a combined plume (in [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:275:Effects on fish populations due to a sediment plume during capital dredging [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:275:There is potential for the sediment plumes predicted to be generated by the dredging required for NGCT, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:275:Significantly, however, the effect of a combined plume (in the zone of interaction) is not likely to result in a [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:277: • Effects on fish due to the creation of a sediment plume from dredging. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:277: • Effects on water quality due to the creation of a sediment plume from dredging. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:277:of disturbance to fish due to creation of a sediment plume was a particular concern and therefore several [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:277: plume. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:298:for granular material and clays) and the predicted extent of the sediment plume, it is expected that there [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:299:and impact of the dredged plume, as any plume generated by operations has been predicted (by HR [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:299:the other side. This will allow time for the plume to disperse before operations are moved to a different [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:299:Mitigation of the plume effects by reducing the size of the dredger, and thus reducing the rate of overflow, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:299:the eastern or western side of the estuary. As with the TSHD, the plume from the barge loading operations [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:302:An interaction between the sediment plumes predicted to be generated by capital dredging associated with [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:302:alone, but within the same predicted spatial extent of the plume for NGCT (as the NGCT dredge footprint [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:302:plume in the Tees is not likely to result in a different behavioural response in fish compared to that which [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:302:channel works, the spatial extent of the plume (and consequently the effect on fish) would be significantly [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:345: the studies on the dispersion of the sediment plume arising during dredging, as [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:345: less instantaneous release of solids. Therefore, sediment plume studies were [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:346: remain in suspension, forming a sediment plume. The plume from the overspill [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:346: plume simulations. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:346: plumes of suspended fine sediment. Importantly the TSHD will result in a [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:346: 7. The HR Wallingford developed model SEDPLUME-RW(3D) was used to [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:346: within the Tees Estuary. SEDPLUME-RW(3D) used tidal currents computed by [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:346: 8. Parameters for the sediment plume simulations for the CSD were established [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:347: 9. Parameters for the sediment plume simulations for the TSHD were established, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:347: 10. For the EIA investigations the SEDPLUME-RW(3D) model was used to simulate [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:347: because the sediment enters the water firstly in a dynamic plume phase (i.e. not [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:347: sediment mixes with the water it behaves as a passive plume that is transported [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:347: simulations assume that by the passive plume phase occurs at about 1m above [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:353: approximate 1km2 of Seal Sands. The SEDPLUME model assumes that the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:377:6.4.6 Plume studies of Dabholm Gut outflow [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:377: SEDPLUME-RW(3D). It should be noted that, as a consequence of the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:377: that following the proposed development the core of the plume of suspended [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:599: coalescing plumes of white, grey and black vapour. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:632: Yes - the dredging plume No - control [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:632: Yes – the deepened channel Yes – the proposed dredging could impact on lower sensitive Yes – the dredging plume [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:632:Capital dredging could impact on habitats and the plume could potentially impact on higher could impact on migratory No [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:633: channel within this water body is Yes – the potential plume could impact on water measures will be [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:634: • Fish: Capital dredging (sediment plume). [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:634: • Water quality: Capital dredging (sediment plume). [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:636:of sediment plumes during dredging was modelled. The largest rise in peak suspended sediment [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:636:the plume. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:637: extent and impact of the plume. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:637:The predicted plume as a result of capital dredging could impact on water quality. However, most of the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:652: Biology: fish Yes The dredging could potentially impact on migratory fish due to the sediment plume being [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:652: dredging and associated plume will be longer than 14 days. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:653: Biology: fish Yes The dredging could potentially impact on migratory fish due to the sediment plume being [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT(2).pdf|IBPB8270R001F01_EIA REPORT(2).pdf]]:653: dredging and associated plume will be longer than 14 days. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/20220302_EIA_Consent_Decision_Response MLA202000079.pdf|20220302_EIA_Consent_Decision_Response MLA202000079.pdf]]:12:create large sediment plumes, which could potentially impact the protected wreck [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/20220302_EIA_Consent_Decision_Response MLA202000079.pdf|20220302_EIA_Consent_Decision_Response MLA202000079.pdf]]:14: plume. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:13:plumes during dredging), particularly as the use of BD typically results in lower environmental impact relative [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:57: SEDPLUME-RW(3D) numerical modelling. Post construction effects were specifically assessed [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:57: modelling of sediment plume released from construction activities. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:59:required) will generate a plume of sediment in the water column. The simulated dredge locations and the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:67:Due to the similarity of the mid to far-field effects of a plume created by the CSD dredging in the upper [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:76:are predicted to occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:91:suspension of sediments and release them into the water column as a plume. This would increase the TSS [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:91:SSC are predicted to occur within the immediate vicinity of the dredger, but the sediment plume spreads [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:92:types of dredger were considered in the plume dispersion studies, namely a CSD dredging mudstone (which [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:93:The plume dispersion studies predict that, during the dredging of sand in the lower channel using a TSHD, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:93:The main mitigation measure to limit sediment plume is selection of the dredging method. As noted above, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:107:hydrodynamic and sedimentary plume modelling undertaken. This section excludes consideration of [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:128:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:128:background) are predicted in the immediate vicinity of the dredger. Sediment plume modelling predicts that [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:156:of sediment into the water column, causing a sediment plume that could potentially affect habitats used by [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:156:estuary. The modelled sediment dispersion plume from the proposed NGCT dredge does not interact with [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:158:plume, the magnitude of the potential effect on feeding birds is predicted to be medium. Based on a receptor [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:159:and impact of the dredged plume, as any plume generated by operations has been predicted (by HR [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:159:the other side. This will allow time for the plume to disperse before operations are moved to a different [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:159:Mitigation of the plume effects by reducing the size of the dredger, and thus reducing the rate of overflow, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:159:barge will be located either on the eastern or western side of the estuary. As with the TSHD, the plume [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:169:occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents during [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:187:variation, in the immediate vicinity of the dredger (see Section 6). Sediment plume modelling has however [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:187:The cross section of the estuary affected by the plume arising from the proposed dredging is particularly [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:188: river. This is to reduce both the extent and impact of the dredged plume, as any plume generated [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:188:Mitigation of the plume effects by reducing the size of the TSHD, and thus reducing the rate of overflow, is [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:188:implementation of this measure will result in the plume from the barge loading operations remaining on one [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:188:to the findings of the sediment plume modelling reporting in Section 6 (which illustrate that the sediment [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:188:plume is predicted to remain within the estuary), results in a conclusion of no impact to fish spawning [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:189:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:189:The cross section of the estuary affected by the plume arising from the proposed dredging is particularly [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:190:and clay, and up to 33 weeks for mudstone), in addition to the relatively localised nature of the plume (in [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:226:Sediment plume modelling predicts that SSC would not increase above background concentrations by more [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:226:The controls outlined in Section 7 (with regard to minimising sediment plume dispersion during dredging) [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:259: influencing the same area as affected by the sediment plume); and, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:260:extent of the dredging and disposal plumes. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:266:All projects scoped into the assessment will involve capital dredging. This activity will create a plume of [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:267:The extent of the sediment plume created by capital dredging is heavily dependent on the dredging plant [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:267:potential spatial extent of sediment plume generation and deposition footprint has been identified from the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:267:sediment in the water column was predicted to be in close proximity to the dredger, with plume dispersion [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:267:resulting in a significantly reduced concentration of suspended sediment beyond the source of the plume. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:268:of the plume for the NGCT scheme. The effect would be additive rather than cumulative (i.e. the predicted [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:271:A cumulative effect on water quality as a result of dredging induced sediment plume generation will only [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:271:In addition, the predictions made for each project (shown in Figures 27.2 to 27.4) represent sediment plume [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:271:coincide to result in a scenario where sediment plumes combine at peak concentration (as predicted by the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:271:The sediment plume predicted due to the NGCT encompasses, and extends beyond, the area of the plume [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:274:due to a sediment plume during capital dredging), given that the waterbirds potentially affected would be [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:274:occur, with movement away from the zone of increased SSC. However, the effect of a combined plume (in [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:275:Effects on fish populations due to a sediment plume during capital dredging [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:275:There is potential for the sediment plumes predicted to be generated by the dredging required for NGCT, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:275:Significantly, however, the effect of a combined plume (in the zone of interaction) is not likely to result in a [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:277: • Effects on fish due to the creation of a sediment plume from dredging. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:277: • Effects on water quality due to the creation of a sediment plume from dredging. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:277:of disturbance to fish due to creation of a sediment plume was a particular concern and therefore several [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:277: plume. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:298:for granular material and clays) and the predicted extent of the sediment plume, it is expected that there [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:299:and impact of the dredged plume, as any plume generated by operations has been predicted (by HR [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:299:the other side. This will allow time for the plume to disperse before operations are moved to a different [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:299:Mitigation of the plume effects by reducing the size of the dredger, and thus reducing the rate of overflow, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:299:the eastern or western side of the estuary. As with the TSHD, the plume from the barge loading operations [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:302:An interaction between the sediment plumes predicted to be generated by capital dredging associated with [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:302:alone, but within the same predicted spatial extent of the plume for NGCT (as the NGCT dredge footprint [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:302:plume in the Tees is not likely to result in a different behavioural response in fish compared to that which [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:302:channel works, the spatial extent of the plume (and consequently the effect on fish) would be significantly [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:345: the studies on the dispersion of the sediment plume arising during dredging, as [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:345: less instantaneous release of solids. Therefore, sediment plume studies were [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:346: remain in suspension, forming a sediment plume. The plume from the overspill [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:346: plume simulations. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:346: plumes of suspended fine sediment. Importantly the TSHD will result in a [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:346: 7. The HR Wallingford developed model SEDPLUME-RW(3D) was used to [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:346: within the Tees Estuary. SEDPLUME-RW(3D) used tidal currents computed by [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:346: 8. Parameters for the sediment plume simulations for the CSD were established [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:347: 9. Parameters for the sediment plume simulations for the TSHD were established, [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:347: 10. For the EIA investigations the SEDPLUME-RW(3D) model was used to simulate [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:347: because the sediment enters the water firstly in a dynamic plume phase (i.e. not [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:347: sediment mixes with the water it behaves as a passive plume that is transported [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:347: simulations assume that by the passive plume phase occurs at about 1m above [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:353: approximate 1km2 of Seal Sands. The SEDPLUME model assumes that the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:377:6.4.6 Plume studies of Dabholm Gut outflow [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:377: SEDPLUME-RW(3D). It should be noted that, as a consequence of the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:377: that following the proposed development the core of the plume of suspended [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:599: coalescing plumes of white, grey and black vapour. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:632: Yes - the dredging plume No - control [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:632: Yes – the deepened channel Yes – the proposed dredging could impact on lower sensitive Yes – the dredging plume [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:632:Capital dredging could impact on habitats and the plume could potentially impact on higher could impact on migratory No [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:633: channel within this water body is Yes – the potential plume could impact on water measures will be [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:634: • Fish: Capital dredging (sediment plume). [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:634: • Water quality: Capital dredging (sediment plume). [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:636:of sediment plumes during dredging was modelled. The largest rise in peak suspended sediment [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:636:the plume. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:637: extent and impact of the plume. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:637:The predicted plume as a result of capital dredging could impact on water quality. However, most of the [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:652: Biology: fish Yes The dredging could potentially impact on migratory fish due to the sediment plume being [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:652: dredging and associated plume will be longer than 14 days. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:653: Biology: fish Yes The dredging could potentially impact on migratory fish due to the sediment plume being [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/IBPB8270R001F01_EIA REPORT.pdf|IBPB8270R001F01_EIA REPORT.pdf]]:653: dredging and associated plume will be longer than 14 days. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:11:Based on the findings of a sediment quality survey and the sediment plume modelling results, no significant [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:11:construction works would result in the generation of a sediment plume which would reduce water quality on [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:11: river. This is to reduce both the extent and impact of the dredged plume, as any plume generated [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:11: deployed to the other side. This will allow time for the plume to disperse before operations are [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:11: plume from the barge loading operations remaining on one side of the river, albeit dispersing to a [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:12:the plume remaining on one side of the river, ensuring that one side of the river will remain relatively [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:12:unaffected by the plume. [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:13:in Section 8.2 will control the spatial extent of the sediment plume, resulting in a residual impact of minor [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:16:Infrastructure as a result of the proposed construction works. Sediment plume modelling predicts that there [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:16:Section 8.2 (with regard to minimising sediment plume dispersion during dredging) would be implemented [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:17:plume for the NGCT scheme. The effect would be additive rather than cumulative (i.e. the predicted impacts [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:18:WFD compliance. However, the risk of disturbance to fish due to creation of a sediment plume was a [[this>RiverTees/Planning/MLA_2020_00079/Additional Documents/PB8270-RHD-ZZ-XX-RP-Z-0002.pdf|PB8270-RHD-ZZ-XX-RP-Z-0002.pdf]]:18: plume. If dredging is to undertaken during the winter period, this would allow one side of the river [[this>RiverTees/Planning/MLA_2020_00079/Response Documents/Schedule 7 - Archaeological WSI.pdf|Schedule 7 - Archaeological WSI.pdf]]:12: coalescing plumes of white, grey and black vapour. [[this>RiverTees/Planning/MLA_2020_00079/Response Documents/Schedule 8_ 20220302_EIA_Consent_Decision_Response MLA202000079.pdf|Schedule 8_ 20220302_EIA_Consent_Decision_Response MLA202000079.pdf]]:12:create large sediment plumes, which could potentially impact the protected wreck [[this>RiverTees/Planning/MLA_2020_00079/Response Documents/Schedule 8_ 20220302_EIA_Consent_Decision_Response MLA202000079.pdf|Schedule 8_ 20220302_EIA_Consent_Decision_Response MLA202000079.pdf]]:14: plume. [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf|MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf]]:15:or another dredging technique with a closed bucket, will be used to minimise any potential sediment plume. [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf|MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf]]:33:The literature indicates that the suspended sediment plume induced by a clamshell bucket under estuarine [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf|MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf]]:33:gravitational settling predominates, and a final mixing zone in which plume sediments continue to settle [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf|MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf]]:48:CIRIA (2000) Scoping the assessment of sediment plumes from dredging. CIRIA Publication C547. London, [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf|MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf]]:75: water will be unaffected. significant sediment plumes due to its [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf|MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf]]:79:indicates that the suspended sediment plume induced by a clamshell bucket under estuarine conditions is [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf|MLA_2021_00215-PB5051-RHD-106-ZZ-RP-Z-0021 Tees Dock Ro-Ro 2 Environmental Report_Final-1.pdf]]:79:settling predominates, and a final mixing zone in which plume sediments continue to settle governed [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf|MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf]]:15:or another dredging technique with a closed bucket, will be used to minimise any potential sediment plume. [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf|MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf]]:33:The literature indicates that the suspended sediment plume induced by a clamshell bucket under estuarine [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf|MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf]]:33:gravitational settling predominates, and a final mixing zone in which plume sediments continue to settle [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf|MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf]]:48:CIRIA (2000) Scoping the assessment of sediment plumes from dredging. CIRIA Publication C547. London, [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf|MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf]]:75: water will be unaffected. significant sediment plumes due to its [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf|MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf]]:79:indicates that the suspended sediment plume induced by a clamshell bucket under estuarine conditions is [[this>RiverTees/Planning/MLA_2021_00215_1/MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf|MLA_2021_00215-Tees Dock Ro-Ro 2 Environmental Report-13.pdf]]:79:settling predominates, and a final mixing zone in which plume sediments continue to settle governed [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:25:To determine suspended sediment plumes resulting from the dredging activities, a numerical [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:25:equilibrium suspended plume is established by the end of two days of dredging. Simulations [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:31:plumes which, dependent on the hydrodynamic conditions at the time, may distribute various [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:57:picture of the suspended sediment plume showing the maximum concentrations computed [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:57:one moves away from the dredging source, the plume is composed of only fine silt and clay [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:57:Figure 7-1 shows the maximum sediment concentrations in the plume resulting from dredging at [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:57:in this area, the plume is of limited extent. It can be seen that maximum total suspended sediment [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:57:concentrations of 1000 mg/l are exceeded very near the source. With the plume being defined by [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:57:concentrations greater than 5-10 mg/l, it can be seen that the plume extends for about 60 m from [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:57:area. Figure 7-3 shows the same simulation during a spring tide period. Although the plume is [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:57:tide the plume is larger than that generated during a neap tide. The maximum concentration for [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:57:the spring tide plume is also greater than 1000 mg/l very near the dredge. Bottom deposition is [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:59:plume is contained within Area #1 with a maximum extent of 170 m and maximum [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:59:deposition. For dredging during a spring tide, Figure 7-7 displays the suspended sediment plume [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:59:of maximum concentrations. Note that now the plume is very much larger and moves out of Area [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:59:the plume being about 1000 m. The bottom deposition is shown in Figure 7-8. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:61:For dredging in Area #2, both the neap and spring tide simulations generate significant plumes, [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:61:dredge are again in excess of 1000 mg/l for both plumes. Again, due to much larger currents, the [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:61:spring tide plume extends much farther than the neap tide plume, e.g., 1000 m versus 400 m. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:61:Bottom deposition contours for both plumes are shown in Figure 7-10 and Figure 7-12, [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:63:Again, as would be expected, the spring tide plume is much longer (1100 m versus 350 m) and [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:63:larger than the neap tide plume. Maximum concentrations are now less than 1000 mg/l very near [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:63:the source for both plumes. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:65:Figure 7-17 and Figure 7-19 show the maximum concentration of suspended sediment plumes [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:65:backhoe dredge, the plume created during spring tide dredging is much larger than that created [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:65:during a neap tide. Maximum concentrations are less than 1000 mg/l for both plumes along the [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:65:dredging line. The spring tide suspended sediment plume extents all the way to the boundary of [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:65:plume. Bottom deposition for both plumes is shown in Figure 7-18 and Figure 7-20, respectively. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:67:Figure 7-21 shows a superposition of the maximum concentration plumes when the hopper [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:67:plume generated from only one dredge operating at a time. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:68:Figure 7-21 Superposition, max concentration plumes hopper operating in Seaton Channel [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:79:size fractions SSFATE computations realistically represent suspended sediment plumes that will [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:79:The size of the sediment plumes are significantly larger when dredging during a spring tide [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:79:versus dredging during a neap tide. The size of the plumes generated by the hopper dredge can [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:79:suspended sediment plumes when the backhoe is operating in Area #1. However, some [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:80:concentrations up to 1000 mg/l close to the source of the plume, but the concentrations drop [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:80:simultaneously, there will be little interaction of the suspended sediment plumes when the [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1a - DNV Report Rev1 2004.pdf|Appendix 16.1a - DNV Report Rev1 2004.pdf]]:80:plume generated from only one dredge operating at a time. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:140:To determine suspended sediment plumes resulting from the dredging activities, a numerical [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:140:equilibrium suspended plume is established by the end of two days of dredging. Simulations [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:146:plumes which, dependent on the hydrodynamic conditions at the time, may distribute various [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:172:picture of the suspended sediment plume showing the maximum concentrations computed [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:172:one moves away from the dredging source, the plume is composed of only fine silt and clay [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:172:Figure 7-1 shows the maximum sediment concentrations in the plume resulting from dredging at [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:172:in this area, the plume is of limited extent. It can be seen that maximum total suspended sediment [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:172:concentrations of 1000 mg/l are exceeded very near the source. With the plume being defined by [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:172:concentrations greater than 5-10 mg/l, it can be seen that the plume extends for about 60 m from [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:172:area. Figure 7-3 shows the same simulation during a spring tide period. Although the plume is [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:172:tide the plume is larger than that generated during a neap tide. The maximum concentration for [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:172:the spring tide plume is also greater than 1000 mg/l very near the dredge. Bottom deposition is [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:174:plume is contained within Area #1 with a maximum extent of 170 m and maximum [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:174:deposition. For dredging during a spring tide, Figure 7-7 displays the suspended sediment plume [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:174:of maximum concentrations. Note that now the plume is very much larger and moves out of Area [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:174:the plume being about 1000 m. The bottom deposition is shown in Figure 7-8. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:176:For dredging in Area #2, both the neap and spring tide simulations generate significant plumes, [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:176:dredge are again in excess of 1000 mg/l for both plumes. Again, due to much larger currents, the [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:176:spring tide plume extends much farther than the neap tide plume, e.g., 1000 m versus 400 m. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:176:Bottom deposition contours for both plumes are shown in Figure 7-10 and Figure 7-12, [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:178:Again, as would be expected, the spring tide plume is much longer (1100 m versus 350 m) and [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:178:larger than the neap tide plume. Maximum concentrations are now less than 1000 mg/l very near [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:178:the source for both plumes. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:180:Figure 7-17 and Figure 7-19 show the maximum concentration of suspended sediment plumes [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:180:backhoe dredge, the plume created during spring tide dredging is much larger than that created [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:180:during a neap tide. Maximum concentrations are less than 1000 mg/l for both plumes along the [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:180:dredging line. The spring tide suspended sediment plume extents all the way to the boundary of [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:180:plume. Bottom deposition for both plumes is shown in Figure 7-18 and Figure 7-20, respectively. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:182:Figure 7-21 shows a superposition of the maximum concentration plumes when the hopper [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:182:plume generated from only one dredge operating at a time. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:183:Figure 7-21 Superposition, max concentration plumes hopper operating in Seaton Channel [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:194:size fractions SSFATE computations realistically represent suspended sediment plumes that will [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:194:The size of the sediment plumes are significantly larger when dredging during a spring tide [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:194:versus dredging during a neap tide. The size of the plumes generated by the hopper dredge can [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:194:suspended sediment plumes when the backhoe is operating in Area #1. However, some [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:195:concentrations up to 1000 mg/l close to the source of the plume, but the concentrations drop [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:195:simultaneously, there will be little interaction of the suspended sediment plumes when the [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/3 EIS Appendices (3).pdf|3 EIS Appendices (3).pdf]]:195:plume generated from only one dredge operating at a time. [[this>RiverTees/Planning/MLA_2015_00334/Additional Documents/Appendix 16.1b - DNV Addendum Report 2005.pdf|Appendix 16.1b - DNV Addendum Report 2005.pdf]]:19:plume seriously affect fish migration, benthic fauna etc? What effects may this have on the food [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1141-MLA.2020.00506.2 SBQ MLV2 FIR 19 Response.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1141-MLA.2020.00506.2 SBQ MLV2 FIR 19 Response.pdf]]:2: is likely to compare with the suspended sediment concentrations and plumes modelled within the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1141-MLA.2020.00506.2 SBQ MLV2 FIR 19 Response.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1141-MLA.2020.00506.2 SBQ MLV2 FIR 19 Response.pdf]]:4:The additional sediment plume modelling which was included and accepted as part of Marine Licence [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1141-MLA.2020.00506.2 SBQ MLV2 FIR 19 Response.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1141-MLA.2020.00506.2 SBQ MLV2 FIR 19 Response.pdf]]:5:As noted in the Hydrodynamic and Sediment Plume Modelling Technical Note submitted to support [[this>Teesworks/Planning/MLA_2020_00506/PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf]]:6: dredge footprint have been proposed based on the results of the sediment plume responses to the Environment Agency’s comments. [[this>Teesworks/Planning/MLA_2020_00506/PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf]]:6: influence of the sediment plume). [[this>Teesworks/Planning/MLA_2020_00506/PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf]]:6: the zone of influence of the sediment plume). [[this>Teesworks/Planning/MLA_2020_00506/PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf]]:9: influenced. Further, the EIA report concludes that the plume effects arising from activities. [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210119 MLA202000506 Tees South Bank Quay CP advice + JPQC.pdf|20210119 MLA202000506 Tees South Bank Quay CP advice + JPQC.pdf]]:4: disposal. Again, concern is largely focused on the water quality issue of the sediment plume, [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210119 MLA202000506 Tees South Bank Quay CP advice + JPQC.pdf|20210119 MLA202000506 Tees South Bank Quay CP advice + JPQC.pdf]]:4: are assessed as minor also, including the remobilisation of chemicals within the SSC plumes [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf]]:6: dredge footprint have been proposed based on the results of the sediment plume responses to the Environment Agency’s comments. [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf]]:6: influence of the sediment plume). [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf]]:6: the zone of influence of the sediment plume). [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1127 MLA.2020.00506.R8 Response to Consultation Comments on Scheme of Monitoring.pdf]]:9: influenced. Further, the EIA report concludes that the plume effects arising from activities. [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20220615 MLA2020005061 L2021003331 Tees South Bank (phase 1) Revised Scheme of Monitoring Review Fisheries advice FINAL.pdf|20220615 MLA2020005061 L2021003331 Tees South Bank (phase 1) Revised Scheme of Monitoring Review Fisheries advice FINAL.pdf]]:3: • Site 2: Located within the predicted plume associated with dredging in the turning circle. [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20220615 MLA2020005061 L2021003331 Tees South Bank (phase 1) Revised Scheme of Monitoring Review Fisheries advice FINAL.pdf|20220615 MLA2020005061 L2021003331 Tees South Bank (phase 1) Revised Scheme of Monitoring Review Fisheries advice FINAL.pdf]]:3: • Site 3: Located within the predicted plume associated with dredging in the quay area. [[this>Teesworks/Planning/MLA_2020_00506/Consultations/338486 - 338489, NE formal response to SBW MLA, 29.01.21.pdf|338486 - 338489, NE formal response to SBW MLA, 29.01.21.pdf]]:4: To restrict suspended sediment plumes to one side of the estuary at a time, and [[this>Teesworks/Planning/MLA_2020_00506/Consultations/338486 - 338489, NE formal response to SBW MLA, 29.01.21.pdf|338486 - 338489, NE formal response to SBW MLA, 29.01.21.pdf]]:6: To restrict suspended sediment plumes to one side of the estuary at a time, in [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf|PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf]]:1:plumes will fall to the riverbed, either soon after disturbance or spillage during the dredging operation (for [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf|PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf]]:2: • Site 2: Located within the predicted plume associated with dredging in the turning circle. [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf|PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf]]:2: • Site 3: Located within the predicted plume associated with dredging in the quay area. [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1124 P03 South Bank Phase 1 Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1124 P03 South Bank Phase 1 Scheme of Monitoring.pdf]]:2: footprint and outside of the predicted zone of influence of the sediment plume). [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1124 P03 South Bank Phase 1 Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1124 P03 South Bank Phase 1 Scheme of Monitoring.pdf]]:2: the sediment plume). [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1124 P03 South Bank Phase 1 Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1124 P03 South Bank Phase 1 Scheme of Monitoring.pdf]]:2:on the results of the sediment plume modelling that was undertaken as part of the Environmental Impact [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-EN-NT-EV-1124 P03 South Bank Phase 1 Scheme of Monitoring.pdf|PC1084-RHD-SB-EN-NT-EV-1124 P03 South Bank Phase 1 Scheme of Monitoring.pdf]]:3:plumes will fall to the riverbed, either soon after disturbance or spillage occurring during the dredging [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA (2).pdf|MLA202000506 and MLA202000507 Draft HRA (2).pdf]]:26:sediment (water will cause plumes of sediment to measures for the proposed scheme in the [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA (2).pdf|MLA202000506 and MLA202000507 Draft HRA (2).pdf]]:26:clarity) form. The plume effects arising form of dredging along the axis of the river [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA (2).pdf|MLA202000506 and MLA202000507 Draft HRA (2).pdf]]:26: characterised by a short-lived one time, sediment plumes occupy only [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA (2).pdf|MLA202000506 and MLA202000507 Draft HRA (2).pdf]]:26: • Black-headed gull ensure sediment plumes are only [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA (2).pdf|MLA202000506 and MLA202000507 Draft HRA (2).pdf]]:26: Subtidal coarse sediment plume effects will be observed [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA (2).pdf|MLA202000506 and MLA202000507 Draft HRA (2).pdf]]:30: • Dredging along the axis of the River Tees will be undertaken to ensure sediment plumes are only occurring in half of the river during capital dredging [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA-2020-00506.pdf|MLA-2020-00506.pdf]]:1: plume will not travel far enough to cause any issues either. Impacts at the disposal site [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA-2020-00506.pdf|MLA-2020-00506.pdf]]:1: this is unlikely to be impacted by the works as the sediment plume is unlikely to travel that [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:2: I. Revised modelling of the plume that takes into account other dredging activity which may [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:5: be dredged from the Tees, resulting in sediment plumes. The effects of the plumes have been [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:5: on the sediment plume model presented, the applicant concluded that peak concentrations from [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:5: dredging will be localised, with the lateral extent of the plume across the river channel predicted to [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:5: plume effects arising from dredging will be observed throughout the whole dredging continuous [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:5: low SSC from 0 to 8.5 mg/l. Modelling of the sediment plume during capital dredging indicates that [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:5: activities be undertaken simultaneously, the sediment plumes, could result in additive effect which [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:5: impact as far as possible. However, it is stated that ‘the additive effect of the sediment plumes from [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:6: a time in order to reduce the extent and impact of the sediment plume. However, in my opinion, [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:7: width of the river. This is to reduce both the extent and impact of the dredged plume, as [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:7: any plume generated by operations is predicted to remain on the same side of the river as [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000506 South Bank Quay-phase 1 - Fisheries advice MG GE + JPQC.pdf]]:7: suspended sediment concentrations and the extent of the plume across the river channel will be [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:2: Dredging must be limited to working on one side of plumes to one side of the estuary [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:2:to migratory fish given that Environment Agency guidance recommends that the limit of any plume should [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:2:more commonly applied to temperature plumes, the Environment Agency has stated on previous projects [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:2:area of the estuary impacted by any sediment plumes resulting from dredging activities therefore this [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:2:dredging associated with the South Bank project that sediment suspended within the dredging plumes will [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:3:Linked to the relatively limited extent of the sediment plume, the EIA Report (Royal HaskoningDHV, 2020) [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:4:summarise, it is predicted that whilst the sediment plumes could combine to cover a larger area of the [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:4:extent of the cross-sectional area of the estuary as plume predictions indicate narrow plumes following [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:5:dredge plumes tend to be narrow and follow tidal flows thus indicating dredging on one side of the estuary [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:6:sensitive to dredging related sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/Consultations/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:8:Based on the predicted plume modelling output, the monitoring buoys are proposed to be positioned as [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20220518 MLA202000506 L2021003331Tees South Bank (phase 1) Monitoring Plan Fisheries advice FINAL.pdf|20220518 MLA202000506 L2021003331Tees South Bank (phase 1) Monitoring Plan Fisheries advice FINAL.pdf]]:3: proposed based on the results of the sediment plume modelling that was undertaken as part of [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20220518 MLA202000506 L2021003331Tees South Bank (phase 1) Monitoring Plan Fisheries advice FINAL.pdf|20220518 MLA202000506 L2021003331Tees South Bank (phase 1) Monitoring Plan Fisheries advice FINAL.pdf]]:7: plume effects arising from dredging will be observed continuously, throughout the whole [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20220518 MLA202000506 L2021003331Tees South Bank (phase 1) Monitoring Plan Fisheries advice FINAL.pdf|20220518 MLA202000506 L2021003331Tees South Bank (phase 1) Monitoring Plan Fisheries advice FINAL.pdf]]:9:Reason: To restrict suspended sediment plumes to one side of the estuary at a time, in order to [[this>Teesworks/Planning/MLA_2020_00506/Consultations/338486 - 338489, NE formal response to SBW MLA, 29.01.21 (1).pdf|338486 - 338489, NE formal response to SBW MLA, 29.01.21 (1).pdf]]:4: To restrict suspended sediment plumes to one side of the estuary at a time, and [[this>Teesworks/Planning/MLA_2020_00506/Consultations/338486 - 338489, NE formal response to SBW MLA, 29.01.21 (1).pdf|338486 - 338489, NE formal response to SBW MLA, 29.01.21 (1).pdf]]:6: To restrict suspended sediment plumes to one side of the estuary at a time, in [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210201 MLA202000506 MLA202000507 Tees South Bank Phases 1 and 2 - EIA Licence Advice Minute - SEAL Advice v2+SJB.pdf|20210201 MLA202000506 MLA202000507 Tees South Bank Phases 1 and 2 - EIA Licence Advice Minute - SEAL Advice v2+SJB.pdf]]:5: and would likely require sediment and plume dispersal modelling as part of a cumulative [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA.pdf|MLA202000506 and MLA202000507 Draft HRA.pdf]]:25:sediment (water will cause plumes of sediment to measures for the proposed scheme in the [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA.pdf|MLA202000506 and MLA202000507 Draft HRA.pdf]]:25:clarity) form. The plume effects arising form of dredging along the axis of the river [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA.pdf|MLA202000506 and MLA202000507 Draft HRA.pdf]]:25: characterised by a short-lived one time, sediment plumes occupy only [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA.pdf|MLA202000506 and MLA202000507 Draft HRA.pdf]]:25: • Black-headed gull ensure sediment plumes are only [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA.pdf|MLA202000506 and MLA202000507 Draft HRA.pdf]]:25: Subtidal coarse sediment plume effects will be observed [[this>Teesworks/Planning/MLA_2020_00506/Consultations/MLA202000506 and MLA202000507 Draft HRA.pdf|MLA202000506 and MLA202000507 Draft HRA.pdf]]:29: • Dredging along the axis of the River Tees will be undertaken to ensure sediment plumes are only occurring in half of the river during capital dredging [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210615 MLA202000506 MLA202000507 Tees South Bank Phases 1 and 2 - EIA _ SEAL Advice Followup+SJB.pdf|20210615 MLA202000506 MLA202000507 Tees South Bank Phases 1 and 2 - EIA _ SEAL Advice Followup+SJB.pdf]]:6: volumes might present a risk due to any potential dispersal plume. I defer comment to [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20210615 MLA202000506 MLA202000507 Tees South Bank Phases 1 and 2 - EIA _ SEAL Advice Followup+SJB.pdf|20210615 MLA202000506 MLA202000507 Tees South Bank Phases 1 and 2 - EIA _ SEAL Advice Followup+SJB.pdf]]:6: potential for accumulation at the site and or plume dispersal modelling). OSPAR Returns [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20220608 MLA2020005061 L20121003331 Cefas advice Final.pdf:3: Sediment Plume Modelling_Final.pdf|20220608 MLA2020005061 L20121003331 Cefas advice Final.pdf:3: Sediment Plume Modelling_Final.pdf]] and ‘pdf sections 2.1 and 2.2.’ which were listed on MCMS [[this>Teesworks/Planning/MLA_2020_00506/Consultations/20220608 MLA2020005061 L20121003331 Cefas advice Final.pdf|20220608 MLA2020005061 L20121003331 Cefas advice Final.pdf]]:3: with a knowledge of coastal process review the hydrodynamic and sediment plume modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:8:5 Hydrodynamic and sedimentary plume modelling report [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:55: Environmental Statement. modelling and modelling of sediment plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:57: Environmental Statement. 2014 modelling and modelling of sediment plume released from [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:60: • Sediment plume modelling: The updated and verified 3D Tees Estuary Tidal Model was used to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:60: coupling with a sediment plume model built in MIKE21-MT software. The sediment plume model [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:91:offshore site will both result in sediment plumes. These effects have been investigated using numerical [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:91:changes in bed thickness when the suspended sediment falls from the plume to become deposited on the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:92: represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:92: become affected by a plume at some point during the dredging or disposal activities (in some areas [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:92:or river channel). To illustrate this, Figures 6.32 – 6.35 shows the maximum extent of the plume during a [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:92:When the dredger is at the south-western end of the transect, the maximum spatial extent of the plume on [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:92:Middlesbrough Dock. When the dredger is at the north-eastern end of the transect, the extent of the plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:92:new quay. However, in all cases considered, the lateral extent of the plume across the river channel is very [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:92:narrow and the magnitude of the SSC within the plume beyond a few hundred metres from the point of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:92:release is of the order of 10 to 20mg/l and in the extremities of the plume reduces further to the same order [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:93:Figure 6.32 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:94:Figure 6.33 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:95:Figure 6.34 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:96:Figure 6.35 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:97:Results from this scenario are broadly similar to those from Stage 1, but now separate plumes are created [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:97:plumes can coalesce and collectively occupy around half the width of the river channel as they move [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:98:Figure 6.37 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:99:Figure 6.38 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:99:plume (at low concentrations) becomes slightly greater; (ii) the extent of the plume across the river channel [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:99:becomes wider; and (iii) at times two plumes are created by the in-parallel dredging activities. Despite these [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:100:Figures 6.40 – 6.43 shows the maximum extent of the plume during a release from the south-western corner [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:100:and the spatial extents of the plume arising from Stage 3 of the dredging are much lower than those [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:101:Figure 6.40 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:102:Figure 6.41 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:103:Figure 6.42 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:104:Figure 6.43 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:104:the maximum plume extent and maximum SSC values within the plume are much lower than experienced [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:104:during both Stages 1 and 2 of the dredging (note the slight plume shown in the mid channel is a remnant of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:104:maximum extent of the plume is confined to within the length of the proposed quay and covers only a very [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:105:phase of the tide). Figure 6.45 and 6.46 shows the maximum extent of the plume during a release from the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:105:On the ebb phase, the plume can extend at low (<30mg/l) concentrations along the jetties of the Oil Terminal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:105:Depot. Under no conditions does the plume enter Tees Dock at any significant concentration. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:106:Figure 6.45 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:107:Figure 6.46 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:107:the plume is created at the turning circle and along parts of the north bank of the river. As with previous [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:108:The sediment plumes that arise from the four stages of the dredging could potentially affect areas of riverbed [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:108:that during the predicted four months of dredging, all individual or coalesced plume effects are confined to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:108:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:108:whilst all plumes associated with dredging of the turning circle are confined to the left bank (north of centre [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:109:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:110:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:110:zone of influence from the sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:111:Within this maximum zone of influence from sediment plumes and bed deposition, the following receptors [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:112:elevations in SSC drop rapidly after each dredging plume has dispersed, and return to baseline levels at [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:the 10-minute duration of disposal activity; and (iii) at selected intervals thereafter until the initial plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. It can then [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:This plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:At 30 minutes after cessation of discharge (Plot F), the plume is less than 250mg/l at its localised centre, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:phase of the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:activity commences and starts to form its own sediment plume (Plot H), the initial plume has moved [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:sufficiently far from its point of release that it does not coalesce with the new plume and, by this time, is less [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:not visible in the plots at the magnitudes presented. The original plume continues to disperse such that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:although when the discharge is made during the flooding tide, the plume moves in a south-easterly direction, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:along the axis of principal tidal flows. At times when the release is around slack water, the plume tends to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:118:west or south-east, respectively). However, when this occurs the concentration in the plume reduces readily [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:119:Figure 6.60 Plume of enhanced SSCs arising from disposal activities during Stage 1 of the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:from the BHD (although the time intervals are greater), the initial plume has greater SSC values at its centre, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:case for maximum SSC), the plume resides in spatial extent around the point of release during the slack [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:plume has started to move towards the south-east through advection by the flood tidal currents, and the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:release point (Plot F). At this point in time, the TSHD plume has further reduced in peak concentration to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:around 200mg/l. Some 30 minutes later, the TSHD plume and subsequent BHD plume have fully coalesced, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:with two peaks in concentration; the original TSHD plume has a peak now around 100mg/l locally at its [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:centre whilst the more recently formed (but smaller) BHD plume has a peak SSC value at its centre of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:previous TSHD release, the now fully coalesced plume has a peak SSC of around 100mg/l very locally and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:plume remains present a further 45 minutes later, the original coalesced plume is considerably smaller in [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:successive disposal events, any coalescence of subsequent plumes would continue to result in only [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:120:coalescence of successive plumes at significant concentrations or for long durations is very low even during [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:121:Figure 6.61 Plume of enhanced SSCs arising from disposal activities during Stage 2 of the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:122:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. The [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:122:plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:122:The plumes associated with Stage 3 disposal activities are generally lower in concentration than those for [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:122:Indeed, the plume arising from Stage 3 disposal activities fully disperses before the next subsequent [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:122:in this offshore area). Due to this, there is no possibility of plumes coalescing from Stage 3 disposal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:123:Figure 6.4 Plume of enhanced SSCs arising from disposal activities during Stage 3 of the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:124:Like during Stage 2, there is potential for the plume from a TSHD discharge to coalesce with a preceding or [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:124:Plot A shows the residual plume from a TSHD disposal some 5 minutes before the commencement of a [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:124:separate plumes at 45 minutes after cessation of the BHD discharge. A further 30 minutes later, another [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:124:TSHD release occurs within the previous BHD plume extent (Plot E). Peak concentrations from the TSHD [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:124:plume has widely dispersed, a further BHD release is made some 50 minutes later, again within the previous [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:124:(now coalesced) plumes. Despite this coalesced plume now containing elements of three separate [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:124:the residual plume shown in Plot A coalesce with the ‘three-release’ plume (Plot G), although the SSC [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:124:values at the point of overlap are very low (~10mg/l). Around 55 minutes later, the plume is now mostly [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:124:disposal site, leading to coalescence of subsequent plumes, the resulting temporary, short duration effects [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:125:Figure 6.5 Plume of enhanced SSCs arising from disposal activities during Stage 4 of the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:126:for coalescence of subsequent plumes is greatest. In reality, subsequent disposals will be at different parts [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:126:At the extremities of the plume extent, there are wide zones of relatively low SSC values (<100mg/l). [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:126:sediment plume associated with one release event (this example being from Stage 1). It can be seen that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:126:is negligible, whilst to the north it covers a similar zone to the sediment plume for this disposal event, which [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:130:the northern and southern boundaries (Figure 6.68). This correlates to the areas where a plume will extend [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:131:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:131:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:131:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:131:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:131:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:131:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:132:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:132:plume effects will be observed throughout much of the approximately four-month period, but at varying [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:132:extents during the four different stages. During Stages 1-3 the dredging-related plume effects will be largely [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:132:Dock and Tees Dock. During Stage 4 the dredging-related plume effects will be largely confined to the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:132:very minor magnitudes, in areas covering the same spatial extent as the sediment plumes. Where this [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:132:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:132:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:143: the findings of hydrodynamic and sedimentary plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:143: sediment and create smothering effects / turbidity / sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:144:are predicted to occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:157:Capital dredging would result in the creation of sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:157:In all tidal conditions modelled, the lateral extent of the plume across the river channel is very narrow and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:157:the magnitude of concentrations within the plume beyond a few hundred metres from the point of release is [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:157:in the order of 10 - 20mg/l and in the extremities of the plume, reduces further to concentrations 0-10mg/l [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:157:Results for this stage were similar to those in Stage 1 but with separate plumes created by the different [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:157:dredgers. At some points in the cycle, areas of these initially separate plumes combine as they move [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:157:The maximum concentrations and the spatial extents of the plume arising from Stage 3 of the dredging are [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:157:and the production rate of dredging is notably lower. Figure 7.5 shows an example plume during Stage 3 [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:157:Again, peak concentrations close to the dredger are shown in the plume modelling output. On the ebb [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:157:phase, the plume can extend at low concentrations (<30mg/l) along the jetties of the Oil Terminal towards [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:158:Figure 7. 3 Plume of suspended sediment concentrations arising from dredging activities during Stage 2 [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:159:Figure 7. 4 Plume arising from dredging activities during Stage 1 of the capital dredge (release from the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:160:Figure 7. 5 Plume of suspended sediment concentrations arising from dredging activities during Stage [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:161:Figure 7.6 Plume of enhanced suspended sediment concentrations arising from dredging activities [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:162:sediment plume is not predicted to reach The Gares water quality monitoring point, no effects on the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:162:The relatively limited nature of the plume extents predicted for the proposed capital dredging indicates that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:166:Additionally, information from sediment plume modelling (see Section 7.5.1) indicates that only the Smiths [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:194:hydrodynamic and sedimentary plume modelling undertaken. This section excludes consideration of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:210:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:210:dredging periods. The sediment plume generated by dredging would likely be dispersed by tidal currents [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:211:immediate vicinity of the dredger. Sediment plume modelling predicts different plume extents and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:211:cases, the sediment plume is predicted to be very narrow within the river, with the phase of dredging with [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:211:extremities of the plume. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:211:All plumes associated with different stages of dredging in the vicinity of the proposed new quay are confined [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:211:to the southern bank of the river, whilst all plumes associated with dredging of the turning circle are confined [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:211:to the northern bank. No plume effects of a significant level above background values are anticipated to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:211:The sediment plume modelling reported within Section 6 also extracted time series plots of changes in SSC [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:212:from the sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:212:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:256: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:257: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:296:In summary, the largest sediment plumes are likely to arise during Stage 2 of the dredging (i.e. BHD and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:296:(it is not a sediment plume, rather a combined zone of influence). The sediment dispersion modelling of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:296:distance from the dredging vessel, both laterally and along the line of the vessel, with plumes diminishing [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:296:of this assessment, the sediment plume may be regarded as representing a temporary loss of foraging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:297:terns do not forage to any significant extent within the predicted range of the sediment plume. Likewise, the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:297:England, 2018a), and the area likely to be affected by the sediment plume at any one time represents around [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:297:available even if the plume does result in temporary occlusion from the affected area. Furthermore, SSC [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:298:and the other stages of the dredge campaign would result in a smaller plume than that described for Stage [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:298: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:298: plume generated by operations is predicted to collectively occupy around half the width of the river [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:298:With the implementation of the above mitigation measure, the modelled plume would only occupy half of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:309:informed by the hydrodynamic and sedimentary plume modelling undertaken, as well as the understanding [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:318:details of the increase in SSC, including the visual output of sediment plume modelling for the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:319:sediment plume creating a ‘barrier’ effect could cause a significant disruption to the annual migration pattern, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:319:during a period of very hot and dry weather. Modelling of the sediment plume during capital dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:320:vessel, both laterally and along the line of the vessel. The periphery of the plume (10 to 20 mg/l) extends [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:320:The cross section of the river channel affected by the plume is particularly relevant when considering [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:320:narrow plume along the axis of the river. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:320:period. However, while unlikely, it has to be taken into account that sediment plumes encompassing the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:320: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:320: plume generated by operations is predicted to remain on the same side of the river as the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:320:Mitigation of the plume effects by reducing the size of the TSHD, and thus reducing the rate of overflow, is [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:424:well as hydrodynamic and sedimentary plume modelling reported in Section 6. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:478:As the offshore disposal commences, a plume of sediment would be generated with the greatest [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:478:concentrations predicted at the end of the discharge period. The sediment plume is predicted to increase [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:478:At 30 minutes after cessation of discharge, the plume is less than 250mg/l at its localised centre, reducing [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:478:the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of less than [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:478:commences and starts to form its own sediment plume, the initial plume has moved sufficiently far from its [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:478:point of release that it does not coalesce with the new plume and, by this time, is less than 40mg/l in SSC [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:478:at the magnitudes presented. The original plume continues to disperse such that after 4 hours and 25 [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:478:At times when the release is around slack water, the plume tends to reside closer to the point of release for [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:478:However, when this occurs the concentration in the plume reduces readily because more material falls to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:479:Based on the modelled effects of the sediment plume at the Tees Bay C disposal site described above, it is [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:490: influencing the same area as affected by the sediment plume); and, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:491:the basis of the potential extent of the dredging and disposal plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:500:All projects scoped into the CIA involve will involve capital dredging. This activity will create a plume of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:500:The extent of the sediment plume created by capital dredging is heavily dependent on the dredging plant [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:501:important to note that figures showing the “maximum extent of sediment plume dispersion and deposition” [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:501:do not represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:501:affected by a plume at some point during the dredging or disposal activities (in some areas this will be on a [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:501:Consequently, for the purposes of this CIA, the maximum zones of influence of sediment plume dispersion [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:501:of sediment plume dispersion and deposition onto the river and/or seabed during capital dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:501:sediment in the water column was predicted to be in close proximity to the dredger, with plume dispersion [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:501:resulting in a significantly reduced concentration of suspended sediment beyond the source of the plume. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:501:material will be re-dredged as part of the capital works for each scheme. At the peripheries of each plume, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:502:(right) as a result of the proposed scheme [Note: plots show sediment plume impacts arising from dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:506:addition, the predictions made for each project represent sediment plume dispersion under specific tidal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:506:where sediment plumes combine at peak concentration (as predicted by the EIA studies for each project) [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:506:at any location. Additionally, mitigation is outlined for all three schemes which would reduce plume extents [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:506:proposed scheme, it is considered unlikely that the plumes would overlap. As a result, there may be a [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:506:additional mitigation measures are identified to reduce any resulting sediment plume as far as possible and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:507:plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:507:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:513:plumes occupy only half of the river cross section) has also been proposed for the NGCT project. For the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:513:England, 2018a), the area affected even by the combined plumes is likely to be low (for example, should [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:513:dredging plumes together will still affect only around 0.5% of the SPA subtidal habitat (Royal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:513:HaskoningDHV, 2015)). However, the additive effect of the sediment plumes from separate dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:514:sediment plumes may deter such species from migrating to and from spawning sites. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:514:the respective sediment plumes could result in an additive effect, as demonstrated in Figures 27.1 to 27.3. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:514:Significantly, the effect of a combined plume is not likely to result in a different behavioural response in fish [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:514:compared with the effect of the projects in isolation, although the increased plume footprint may increase [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:514:of the sediment plumes from separate dredging campaigns cannot be completely avoided if the campaigns [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:522:WFD water body (approximately 6.3km, see Figure 28.1) and plume modelling results described in Section [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:528: measures identified for the Tees estuary. habitats located within sediment plumes created [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:532:Capital dredging within the river would result in sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:532: BHD working to dredge the In all tidal conditions modelled, the lateral extent of the plume across the river channel [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:532: upper soft material in the is very narrow and the magnitude of concentrations within the plume beyond a few [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:532: channel. extremities of the plume, reduces further to concentrations 0-10mg/l. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:532: 2 Results for this stage were similar to those in Stage 1 but with separate plumes [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:532: separate plumes combine as they move upstream and downstream according to the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:532: 3 BHD working to dredge the The maximum concentrations and the spatial extents of the plume arising from Stage [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:532: channel. notably lower. Plume very small and located close to the dredging activity. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:532: 4 Again, peak concentrations close to the dredger are shown in the plume modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:532: output. On the ebb phase, the plume can extend at low concentrations (<30mg/l) [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:534:represent a more conservative scenario, as sediment plume modelling outlined above indicates relatively [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:534:limited plume extents for the majority of the capital dredge for the proposed scheme. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:535:Additionally, sediment plume results for Smiths Dock monitoring point (point 3) indicated only temporary [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:535:be temporary which would disperse following cessation of the works. Plume extents during each of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:537:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:538:zone of influence from the sediment plumes. As a result, a deterioration in ecological class status is not [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:539:peak migratory season, when a sediment plume creating a ‘barrier’ effect could cause a significant disruption [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:539:extent and impact of the plume. This allows a passage through which migratory fish will be able to move [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:539: dredging along the axis of the river to ensure the plumes are [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:544: • Cumulative effects of sediment plumes and associated effects on water quality and fish [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:545:Section 27 considers the potential cumulative effects of the proposed schemes on sediment plumes and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:545:marine water quality. To summarise, whilst the sediment plumes could combine to cover a larger area of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:545:plumes spreading across the width of the channel. Additionally, due to navigational safety, it is unlikely that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:549:strips thus limiting the plume extent. As a result, non- temporary effects on water quality and associated [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:550:would be sediment plumes associated with dredging simultaneously. However, on further consideration, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:559:proposed scheme nor the modelled extent of the maximum-expected sediment plume from the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:559:influence of the proposed scheme will be determined by the sediment plume during dredging activities. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:572:The capital dredging of the river will cause plumes of sediment to form. The plume effects arising from the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:572:operation, the plume effects will be observed throughout much of the approximately five-month period, but [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:572:of sediment from the plumes on the river or seabed will be very small. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:575:requires use of TSHD and BHD on soft sediment in the channel and berth pocket) will result in plumes of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:575:with plumes diminishing typically to levels of <30 mg/l but often <10mg/l at a distance of no more than a few [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:575:England, 2018a). The area affected by the sediment plume generated from proposed dredging, though [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:580:In terms of intra-project effects on foraging common terns, the zone of influence from the sediment plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:580:of the area would not be increased since the plume is considered to be the most far-reaching effect on tern [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:583:Effects on fish may be compounded by the combined sediment plumes of other projects or plans that may [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:584:An interaction between the sediment plumes would only occur in the unlikely event that the capital dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:584:Plumes from each project would be temporary and short-lived. The same applies for the Anglo American [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:584:combined plumes is expected to be minor. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:584:sediment plumes occupy only half of the river cross section) has also been proposed for the NGCT project. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:586:The zone of influence from predicted sediment plumes (including the combined plumes from the proposed [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-10.pdf]]:593:sediment plumes arising from dredging. Construction Industry Research and Information Association [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:2:that the most important potential coastal process impact would be changes in suspended sediment plumes, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:2:suspended sediment plumes; that being each disposal within the licensed disposal site being released at [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:2:plumes from separate disposal activities over the whole dredging campaign. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:2:licensed disposal site is a worst case for potential plume coalescence it is not realistic in terms of changes [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:2:bed thickness caused by deposition of material from the sediment plume associated with one single release [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:4:(Figure 6.67). This correlates to the areas where a plume will extend along the axis of the prevailing tidal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:15: • Revised modelling of the plume that takes into account other dredging activity which may be [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:15:each project are presented and discussed. It is not practicable to undertake a combined sediment plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:15:addition, the predictions made for each project represent sediment plume dispersion under specific tidal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:16:scenario where sediment plumes combine at peak concentration (as predicted by the EIA studies for each [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:16:project) at any location. Additionally, mitigation is outlined for all three schemes which would reduce plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:16:We would also like to reiterate that the sediment plumes shown in Section 6 of the EIA Report are maximum [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:16:not represent a plume that would occur at any one point of time. Rather, the figures show the areas of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-34.pdf]]:16:river channel that will become affected by a plume at some point during the dredging campaign (in some [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:2:that the most important potential coastal process impact would be changes in suspended sediment plumes, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:2:suspended sediment plumes; that being each disposal within the licensed disposal site being released at [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:2:plumes from separate disposal activities over the whole dredging campaign. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:2:licensed disposal site is a worst case for potential plume coalescence it is not realistic in terms of changes [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:2:bed thickness caused by deposition of material from the sediment plume associated with one single release [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:4:(Figure 6.67). This correlates to the areas where a plume will extend along the axis of the prevailing tidal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:15: • Revised modelling of the plume that takes into account other dredging activity which may be [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:15:each project are presented and discussed. It is not practicable to undertake a combined sediment plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:15:addition, the predictions made for each project represent sediment plume dispersion under specific tidal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:16:scenario where sediment plumes combine at peak concentration (as predicted by the EIA studies for each [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:16:project) at any location. Additionally, mitigation is outlined for all three schemes which would reduce plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:16:We would also like to reiterate that the sediment plumes shown in Section 6 of the EIA Report are maximum [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:16:not represent a plume that would occur at any one point of time. Rather, the figures show the areas of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-25.pdf]]:16:river channel that will become affected by a plume at some point during the dredging campaign (in some [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:6:additional dredged material is likely to compare with the suspended sediment concentrations and plumes [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:6:(provided during consultation for MLV1 in relation to the Hydrodynamic and Sediment Plume Modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:7:assessment. I recognise that the Applicant has provided the Hydrodynamic and Sediment Plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:7:comparison of the suspended sediment concentrations and plumes modelled within the original EIA, with [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:7:Please provide a side-by-side comparison of the suspended sediment concentrations and plumes [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:7:already been modelled, the sediment plume should not be any more extensive than that already [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:8: plume modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:8:Request 19 Response section 3.6, states that “as noted in the Hydrodynamic and Sediment Plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:9:Hydrodynamic and Sediment Plume Modelling Technical Note provided as Appendix D in document 5 in [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:9:The hydrodynamic and sediment plume modelling report took into account (i.e., pre-empted) the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf|MLA_2020_00506-PC1084-RHD-EN-SB-ME-EV-1144-MLA.2022.00506.2 South Bank Quay FIR 20 Response.pdf]]:11:Report and the updated hydrodynamic and sediment plume modelling report submitted in support of [[this>Teesworks/Planning/MLA_2020_00506/PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf|PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf]]:1:plumes will fall to the riverbed, either soon after disturbance or spillage during the dredging operation (for [[this>Teesworks/Planning/MLA_2020_00506/PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf|PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf]]:2: • Site 2: Located within the predicted plume associated with dredging in the turning circle. [[this>Teesworks/Planning/MLA_2020_00506/PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf|PC1084-RHD-SB-EN-NT-EV-1124 Updated Scheme of Monitoring - May 2022.pdf]]:2: • Site 3: Located within the predicted plume associated with dredging in the quay area. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:1:Hydrodynamic and Sediment Plume Modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:5:of the EIA Report and the accompanying Appendix 5: Hydrodynamics and Sedimentary Plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:5: a sediment plume model built in MIKE3-MT software. The sediment plume model was run for the entire [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:7:been re-assessed using a combination of expert geomorphological assessment (EGA) and sediment plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:8:Report and the accompanying Appendix 5: Hydrodynamics and Sedimentary Plume Modelling of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:10:plume dispersion model are described in this section. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:14:The following assumptions have been made for the simulation of sediment plumes arising from dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:14:is a conservative approach for worst case plume effect. The dredger will actually move around the dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:14:release is a conservative approach for worst case plume effect. Recognising that the barges could actually [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:15:programme. It is important to note that this type of figure does not represent a plume or deposition that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:15:of the river channel or offshore area that will become affected by a plume or deposition at some point during [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:16:are generally slightly lower than near-bed effects, and during the dredging, all plume effects are confined to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:16:and the Oil Terminal on the north bank at the downstream end. Furthermore, all plumes associated with [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:16:bank (south of centre line) portion of the channel’s width, whilst all plumes associated with dredging of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:16:that they respectively affect. No plume effects (and by implication no deposition effects) of a significant level [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:21:bed thickness caused by the deposition of sediment from the plumes created by river dredging. It can be [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:21:sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:22:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:23:in the model at a single release point and the potential for coalescence of subsequent depositional plumes [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:23:and downstream boundaries. At the extremities of the plume extent, there are wide zones of relatively low [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:26:plume for the worst case considered (all material released at a single central point). It can be seen that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:26:the sediment plume. In reality, disposals will be at different points within the licensed area, and so such a [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:27:and shown in Figure 3-14. In keeping with the results for the plume dispersion, the updated modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:29:cause plumes of sediment to form close to the release points of material into the water column. These [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:29:plumes will disperse under wave and current action and all sediment particles suspended in the water [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-0001 Technical Note - Hydrodynamic and Sediment Plume Modelling_Final-49.pdf]]:29:Report and the accompanying Appendix 5: Hydrodynamics and Sedimentary Plume Modelling of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf|MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf]]:2: water quality and sediment plumes) is sufficient to cover this activity. It is also noted that the approach taken has been previously agreed as [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf|MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf]]:4:The reason for this is that increases in suspended sediment concentration in the water column and plumes of suspended sediment created [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf|MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf]]:4:discussion of how the additional dredged material is likely to compare with the suspended sediment concentrations and plumes modelled [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf|MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf]]:5:Plume Modelling report. As such, there is no change to the required durations of dredging as proposed and assessed as part of MLV1.” As [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf|MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf]]:6:comments2. In previous fisheries advice1, advisors highlighted that the sediment plume arising from the proposed dredging regime had the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf|MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf]]:7: suspended sediment concentrations and plumes modelled within the original EIA. The MMO do not require additional modelling at this [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf|MLA_2020_00506-MLA_2020_00506_2_RFI 19_Cefas Comments_MMO requested updates.pdf]]:10:John, S.A., Challinor, S.L., Simpson, M., Burt, T.N. and Spearman, J. (2000). Scoping the assessment of sediment plumes arising from [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf]]:14:The tool requires the input of predicted suspended solids concentrations arising from the dredge plume. For [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf]]:14:predicted to last for a duration of approximately four weeks. The likely plume extent during this phase is [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf]]:16:uplift column in Appendix 2). It can be seen in Figure 2.2 that the suspended sediment plume is predicted [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf]]:17:However, sediment plume modelling does not predict long term and large scale extents of elevated [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf]]:27:suspended sediment during dredging is expected to be in the form of a narrow plume within the river, which [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-16.pdf]]:45:parameters, the short term nature of the sediment plume and limited spatial extent would limit any EQS [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf|MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf]]:3: suspended sediment concentrations and plumes modelled within the original EIA, in order for [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf|MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf]]:3: in relation to the Hydrodynamic and Sediment Plume Modelling Technical Note), that “the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf|MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf]]:3: Hydrodynamic and Sediment Plume Modelling Technical Note within this consultation, however, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf|MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf]]:3: sediment concentrations and plumes modelled within the original EIA, with the most up to date [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf|MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf]]:3: Sediment Plume Modelling Technical Note submitted to support Variation 1, the capital dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf|MLA_2020_00506-MLA_2020_00506_2_Cefas_comments_for_action_RFI_19.pdf]]:3: response directs me to the Hydrodynamic and Sediment Plume Modelling Technical Note [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:8:5 Hydrodynamic and sedimentary plume modelling report [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:55: Environmental Statement. modelling and modelling of sediment plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:57: Environmental Statement. 2014 modelling and modelling of sediment plume released from [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:60: • Sediment plume modelling: The updated and verified 3D Tees Estuary Tidal Model was used to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:60: coupling with a sediment plume model built in MIKE21-MT software. The sediment plume model [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:91:offshore site will both result in sediment plumes. These effects have been investigated using numerical [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:91:changes in bed thickness when the suspended sediment falls from the plume to become deposited on the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92: represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92: become affected by a plume at some point during the dredging or disposal activities (in some areas [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:or river channel). To illustrate this, Figures 6.32 – 6.35 shows the maximum extent of the plume during a [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:When the dredger is at the south-western end of the transect, the maximum spatial extent of the plume on [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:Middlesbrough Dock. When the dredger is at the north-eastern end of the transect, the extent of the plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:new quay. However, in all cases considered, the lateral extent of the plume across the river channel is very [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:narrow and the magnitude of the SSC within the plume beyond a few hundred metres from the point of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:release is of the order of 10 to 20mg/l and in the extremities of the plume reduces further to the same order [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:93:Figure 6.32 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:94:Figure 6.33 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:95:Figure 6.34 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:96:Figure 6.35 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:97:Results from this scenario are broadly similar to those from Stage 1, but now separate plumes are created [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:97:plumes can coalesce and collectively occupy around half the width of the river channel as they move [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:98:Figure 6.37 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:99:Figure 6.38 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:99:plume (at low concentrations) becomes slightly greater; (ii) the extent of the plume across the river channel [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:99:becomes wider; and (iii) at times two plumes are created by the in-parallel dredging activities. Despite these [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:100:Figures 6.40 – 6.43 shows the maximum extent of the plume during a release from the south-western corner [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:100:and the spatial extents of the plume arising from Stage 3 of the dredging are much lower than those [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:101:Figure 6.40 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:102:Figure 6.41 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:103:Figure 6.42 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:104:Figure 6.43 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:104:the maximum plume extent and maximum SSC values within the plume are much lower than experienced [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:104:during both Stages 1 and 2 of the dredging (note the slight plume shown in the mid channel is a remnant of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:104:maximum extent of the plume is confined to within the length of the proposed quay and covers only a very [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:105:phase of the tide). Figure 6.45 and 6.46 shows the maximum extent of the plume during a release from the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:105:On the ebb phase, the plume can extend at low (<30mg/l) concentrations along the jetties of the Oil Terminal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:105:Depot. Under no conditions does the plume enter Tees Dock at any significant concentration. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:106:Figure 6.45 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:107:Figure 6.46 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:107:the plume is created at the turning circle and along parts of the north bank of the river. As with previous [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:108:The sediment plumes that arise from the four stages of the dredging could potentially affect areas of riverbed [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:108:that during the predicted four months of dredging, all individual or coalesced plume effects are confined to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:108:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:108:whilst all plumes associated with dredging of the turning circle are confined to the left bank (north of centre [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:109:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:110:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:110:zone of influence from the sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:111:Within this maximum zone of influence from sediment plumes and bed deposition, the following receptors [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:112:elevations in SSC drop rapidly after each dredging plume has dispersed, and return to baseline levels at [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:the 10-minute duration of disposal activity; and (iii) at selected intervals thereafter until the initial plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. It can then [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:This plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:At 30 minutes after cessation of discharge (Plot F), the plume is less than 250mg/l at its localised centre, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:phase of the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:activity commences and starts to form its own sediment plume (Plot H), the initial plume has moved [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:sufficiently far from its point of release that it does not coalesce with the new plume and, by this time, is less [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:not visible in the plots at the magnitudes presented. The original plume continues to disperse such that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:although when the discharge is made during the flooding tide, the plume moves in a south-easterly direction, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:along the axis of principal tidal flows. At times when the release is around slack water, the plume tends to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:west or south-east, respectively). However, when this occurs the concentration in the plume reduces readily [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:119:Figure 6.60 Plume of enhanced SSCs arising from disposal activities during Stage 1 of the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:from the BHD (although the time intervals are greater), the initial plume has greater SSC values at its centre, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:case for maximum SSC), the plume resides in spatial extent around the point of release during the slack [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:plume has started to move towards the south-east through advection by the flood tidal currents, and the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:release point (Plot F). At this point in time, the TSHD plume has further reduced in peak concentration to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:around 200mg/l. Some 30 minutes later, the TSHD plume and subsequent BHD plume have fully coalesced, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:with two peaks in concentration; the original TSHD plume has a peak now around 100mg/l locally at its [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:centre whilst the more recently formed (but smaller) BHD plume has a peak SSC value at its centre of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:previous TSHD release, the now fully coalesced plume has a peak SSC of around 100mg/l very locally and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:plume remains present a further 45 minutes later, the original coalesced plume is considerably smaller in [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:successive disposal events, any coalescence of subsequent plumes would continue to result in only [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:coalescence of successive plumes at significant concentrations or for long durations is very low even during [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:121:Figure 6.61 Plume of enhanced SSCs arising from disposal activities during Stage 2 of the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:122:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. The [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:122:plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:122:The plumes associated with Stage 3 disposal activities are generally lower in concentration than those for [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:122:Indeed, the plume arising from Stage 3 disposal activities fully disperses before the next subsequent [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:122:in this offshore area). Due to this, there is no possibility of plumes coalescing from Stage 3 disposal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:123:Figure 6.4 Plume of enhanced SSCs arising from disposal activities during Stage 3 of the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:Like during Stage 2, there is potential for the plume from a TSHD discharge to coalesce with a preceding or [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:Plot A shows the residual plume from a TSHD disposal some 5 minutes before the commencement of a [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:separate plumes at 45 minutes after cessation of the BHD discharge. A further 30 minutes later, another [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:TSHD release occurs within the previous BHD plume extent (Plot E). Peak concentrations from the TSHD [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:plume has widely dispersed, a further BHD release is made some 50 minutes later, again within the previous [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:(now coalesced) plumes. Despite this coalesced plume now containing elements of three separate [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:the residual plume shown in Plot A coalesce with the ‘three-release’ plume (Plot G), although the SSC [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:values at the point of overlap are very low (~10mg/l). Around 55 minutes later, the plume is now mostly [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:disposal site, leading to coalescence of subsequent plumes, the resulting temporary, short duration effects [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:125:Figure 6.5 Plume of enhanced SSCs arising from disposal activities during Stage 4 of the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:126:for coalescence of subsequent plumes is greatest. In reality, subsequent disposals will be at different parts [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:126:At the extremities of the plume extent, there are wide zones of relatively low SSC values (<100mg/l). [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:126:sediment plume associated with one release event (this example being from Stage 1). It can be seen that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:126:is negligible, whilst to the north it covers a similar zone to the sediment plume for this disposal event, which [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:130:the northern and southern boundaries (Figure 6.68). This correlates to the areas where a plume will extend [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:plume effects will be observed throughout much of the approximately four-month period, but at varying [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:extents during the four different stages. During Stages 1-3 the dredging-related plume effects will be largely [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:Dock and Tees Dock. During Stage 4 the dredging-related plume effects will be largely confined to the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:very minor magnitudes, in areas covering the same spatial extent as the sediment plumes. Where this [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:143: the findings of hydrodynamic and sedimentary plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:143: sediment and create smothering effects / turbidity / sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:144:are predicted to occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:Capital dredging would result in the creation of sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:In all tidal conditions modelled, the lateral extent of the plume across the river channel is very narrow and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:the magnitude of concentrations within the plume beyond a few hundred metres from the point of release is [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:in the order of 10 - 20mg/l and in the extremities of the plume, reduces further to concentrations 0-10mg/l [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:Results for this stage were similar to those in Stage 1 but with separate plumes created by the different [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:dredgers. At some points in the cycle, areas of these initially separate plumes combine as they move [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:The maximum concentrations and the spatial extents of the plume arising from Stage 3 of the dredging are [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:and the production rate of dredging is notably lower. Figure 7.5 shows an example plume during Stage 3 [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:Again, peak concentrations close to the dredger are shown in the plume modelling output. On the ebb [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:phase, the plume can extend at low concentrations (<30mg/l) along the jetties of the Oil Terminal towards [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:158:Figure 7. 3 Plume of suspended sediment concentrations arising from dredging activities during Stage 2 [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:159:Figure 7. 4 Plume arising from dredging activities during Stage 1 of the capital dredge (release from the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:160:Figure 7. 5 Plume of suspended sediment concentrations arising from dredging activities during Stage [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:161:Figure 7.6 Plume of enhanced suspended sediment concentrations arising from dredging activities [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:162:sediment plume is not predicted to reach The Gares water quality monitoring point, no effects on the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:162:The relatively limited nature of the plume extents predicted for the proposed capital dredging indicates that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:166:Additionally, information from sediment plume modelling (see Section 7.5.1) indicates that only the Smiths [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:194:hydrodynamic and sedimentary plume modelling undertaken. This section excludes consideration of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:210:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:210:dredging periods. The sediment plume generated by dredging would likely be dispersed by tidal currents [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:immediate vicinity of the dredger. Sediment plume modelling predicts different plume extents and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:cases, the sediment plume is predicted to be very narrow within the river, with the phase of dredging with [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:extremities of the plume. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:All plumes associated with different stages of dredging in the vicinity of the proposed new quay are confined [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:to the southern bank of the river, whilst all plumes associated with dredging of the turning circle are confined [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:to the northern bank. No plume effects of a significant level above background values are anticipated to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:The sediment plume modelling reported within Section 6 also extracted time series plots of changes in SSC [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:212:from the sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:212:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:256: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:257: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:296:In summary, the largest sediment plumes are likely to arise during Stage 2 of the dredging (i.e. BHD and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:296:(it is not a sediment plume, rather a combined zone of influence). The sediment dispersion modelling of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:296:distance from the dredging vessel, both laterally and along the line of the vessel, with plumes diminishing [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:296:of this assessment, the sediment plume may be regarded as representing a temporary loss of foraging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:297:terns do not forage to any significant extent within the predicted range of the sediment plume. Likewise, the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:297:England, 2018a), and the area likely to be affected by the sediment plume at any one time represents around [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:297:available even if the plume does result in temporary occlusion from the affected area. Furthermore, SSC [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:298:and the other stages of the dredge campaign would result in a smaller plume than that described for Stage [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:298: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:298: plume generated by operations is predicted to collectively occupy around half the width of the river [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:298:With the implementation of the above mitigation measure, the modelled plume would only occupy half of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:309:informed by the hydrodynamic and sedimentary plume modelling undertaken, as well as the understanding [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:318:details of the increase in SSC, including the visual output of sediment plume modelling for the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:319:sediment plume creating a ‘barrier’ effect could cause a significant disruption to the annual migration pattern, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:319:during a period of very hot and dry weather. Modelling of the sediment plume during capital dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320:vessel, both laterally and along the line of the vessel. The periphery of the plume (10 to 20 mg/l) extends [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320:The cross section of the river channel affected by the plume is particularly relevant when considering [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320:narrow plume along the axis of the river. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320:period. However, while unlikely, it has to be taken into account that sediment plumes encompassing the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320: plume generated by operations is predicted to remain on the same side of the river as the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320:Mitigation of the plume effects by reducing the size of the TSHD, and thus reducing the rate of overflow, is [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:424:well as hydrodynamic and sedimentary plume modelling reported in Section 6. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:As the offshore disposal commences, a plume of sediment would be generated with the greatest [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:concentrations predicted at the end of the discharge period. The sediment plume is predicted to increase [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:At 30 minutes after cessation of discharge, the plume is less than 250mg/l at its localised centre, reducing [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of less than [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:commences and starts to form its own sediment plume, the initial plume has moved sufficiently far from its [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:point of release that it does not coalesce with the new plume and, by this time, is less than 40mg/l in SSC [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:at the magnitudes presented. The original plume continues to disperse such that after 4 hours and 25 [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:At times when the release is around slack water, the plume tends to reside closer to the point of release for [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:However, when this occurs the concentration in the plume reduces readily because more material falls to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:479:Based on the modelled effects of the sediment plume at the Tees Bay C disposal site described above, it is [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:490: influencing the same area as affected by the sediment plume); and, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:491:the basis of the potential extent of the dredging and disposal plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:500:All projects scoped into the CIA involve will involve capital dredging. This activity will create a plume of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:500:The extent of the sediment plume created by capital dredging is heavily dependent on the dredging plant [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:important to note that figures showing the “maximum extent of sediment plume dispersion and deposition” [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:do not represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:affected by a plume at some point during the dredging or disposal activities (in some areas this will be on a [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:Consequently, for the purposes of this CIA, the maximum zones of influence of sediment plume dispersion [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:of sediment plume dispersion and deposition onto the river and/or seabed during capital dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:sediment in the water column was predicted to be in close proximity to the dredger, with plume dispersion [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:resulting in a significantly reduced concentration of suspended sediment beyond the source of the plume. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:material will be re-dredged as part of the capital works for each scheme. At the peripheries of each plume, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:502:(right) as a result of the proposed scheme [Note: plots show sediment plume impacts arising from dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:506:addition, the predictions made for each project represent sediment plume dispersion under specific tidal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:506:where sediment plumes combine at peak concentration (as predicted by the EIA studies for each project) [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:506:at any location. Additionally, mitigation is outlined for all three schemes which would reduce plume extents [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:506:proposed scheme, it is considered unlikely that the plumes would overlap. As a result, there may be a [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:506:additional mitigation measures are identified to reduce any resulting sediment plume as far as possible and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:507:plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:507:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:513:plumes occupy only half of the river cross section) has also been proposed for the NGCT project. For the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:513:England, 2018a), the area affected even by the combined plumes is likely to be low (for example, should [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:513:dredging plumes together will still affect only around 0.5% of the SPA subtidal habitat (Royal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:513:HaskoningDHV, 2015)). However, the additive effect of the sediment plumes from separate dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:514:sediment plumes may deter such species from migrating to and from spawning sites. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:514:the respective sediment plumes could result in an additive effect, as demonstrated in Figures 27.1 to 27.3. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:514:Significantly, the effect of a combined plume is not likely to result in a different behavioural response in fish [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:514:compared with the effect of the projects in isolation, although the increased plume footprint may increase [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:514:of the sediment plumes from separate dredging campaigns cannot be completely avoided if the campaigns [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:522:WFD water body (approximately 6.3km, see Figure 28.1) and plume modelling results described in Section [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:528: measures identified for the Tees estuary. habitats located within sediment plumes created [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532:Capital dredging within the river would result in sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: BHD working to dredge the In all tidal conditions modelled, the lateral extent of the plume across the river channel [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: upper soft material in the is very narrow and the magnitude of concentrations within the plume beyond a few [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: channel. extremities of the plume, reduces further to concentrations 0-10mg/l. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: 2 Results for this stage were similar to those in Stage 1 but with separate plumes [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: separate plumes combine as they move upstream and downstream according to the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: 3 BHD working to dredge the The maximum concentrations and the spatial extents of the plume arising from Stage [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: channel. notably lower. Plume very small and located close to the dredging activity. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: 4 Again, peak concentrations close to the dredger are shown in the plume modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: output. On the ebb phase, the plume can extend at low concentrations (<30mg/l) [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:534:represent a more conservative scenario, as sediment plume modelling outlined above indicates relatively [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:534:limited plume extents for the majority of the capital dredge for the proposed scheme. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:535:Additionally, sediment plume results for Smiths Dock monitoring point (point 3) indicated only temporary [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:535:be temporary which would disperse following cessation of the works. Plume extents during each of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:537:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:538:zone of influence from the sediment plumes. As a result, a deterioration in ecological class status is not [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:539:peak migratory season, when a sediment plume creating a ‘barrier’ effect could cause a significant disruption [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:539:extent and impact of the plume. This allows a passage through which migratory fish will be able to move [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:539: dredging along the axis of the river to ensure the plumes are [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:544: • Cumulative effects of sediment plumes and associated effects on water quality and fish [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:545:Section 27 considers the potential cumulative effects of the proposed schemes on sediment plumes and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:545:marine water quality. To summarise, whilst the sediment plumes could combine to cover a larger area of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:545:plumes spreading across the width of the channel. Additionally, due to navigational safety, it is unlikely that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:549:strips thus limiting the plume extent. As a result, non- temporary effects on water quality and associated [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:550:would be sediment plumes associated with dredging simultaneously. However, on further consideration, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:559:proposed scheme nor the modelled extent of the maximum-expected sediment plume from the capital [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:559:influence of the proposed scheme will be determined by the sediment plume during dredging activities. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:572:The capital dredging of the river will cause plumes of sediment to form. The plume effects arising from the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:572:operation, the plume effects will be observed throughout much of the approximately five-month period, but [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:572:of sediment from the plumes on the river or seabed will be very small. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:575:requires use of TSHD and BHD on soft sediment in the channel and berth pocket) will result in plumes of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:575:with plumes diminishing typically to levels of <30 mg/l but often <10mg/l at a distance of no more than a few [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:575:England, 2018a). The area affected by the sediment plume generated from proposed dredging, though [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:580:In terms of intra-project effects on foraging common terns, the zone of influence from the sediment plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:580:of the area would not be increased since the plume is considered to be the most far-reaching effect on tern [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:583:Effects on fish may be compounded by the combined sediment plumes of other projects or plans that may [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:584:An interaction between the sediment plumes would only occur in the unlikely event that the capital dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:584:Plumes from each project would be temporary and short-lived. The same applies for the Anglo American [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:584:combined plumes is expected to be minor. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:584:sediment plumes occupy only half of the river cross section) has also been proposed for the NGCT project. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:586:The zone of influence from predicted sediment plumes (including the combined plumes from the proposed [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00506-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:593:sediment plumes arising from dredging. Construction Industry Research and Information Association [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-Licence Document (Marine).pdf|MLA_2020_00506-Licence Document (Marine).pdf]]:16: To restrict suspended sediment plumes to one side of the estuary at a time, in order to reduce loss of tern foraging habitat. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:2:MLV1 was supported by further sediment plume modelling, presented in the Hydrodynamic and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:2:Sediment Plume Modelling Report (see Appendix D). This updated modelling was undertaken to reflect [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:9:at the furthest point from the midline of the current channel. The hydrodynamic and sediment plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:9:currents, and so is transported in a direction parallel with the river banks. Sediment plumes are therefore [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:15:The sediment plume modelling undertaken for the original EIA Report predicted that highest [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:15:hundred metres of the point of release, and again to 0-10mg/L at the extremities of the plume. In all [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:15:form a narrow plume within the river channel, with plumes associated with dredging of the berthing [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:15:the sediment plume, including the following: [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:15:The updated hydrodynamic and sediment plume modelling presented within the modelling note [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:15:taken as a worst case scenario for the hydrodynamic and sediment plume modelling undertaken in [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:16:by the updated sediment plume modelling submitted in support of MLV1 (see Appendix D), which [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:16:will increase under MLV2, the updated sediment plume modelling submitted in support of MLV1 (see [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:16:hydrodynamic and sediment plume modelling report prepared and submitted in support of MLV1 (Royal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:18:CIRIA (2000). Scoping the assessment of sediment plumes from dredging (C547). [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:18:Royal HaskoningDHV (2022). South Bank Quay Technical Note: Hydrodynamic and Sediment Plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:28:extent and impact of any sediment plumes that could affect migrating species. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:30:Appendix D Hydrodynamic and Sediment Plume Modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:31:Hydrodynamic and Sediment Plume Modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:35:of the EIA Report and the accompanying Appendix 5: Hydrodynamics and Sedimentary Plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:35: a sediment plume model built in MIKE3-MT software. The sediment plume model was run for the entire [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:37:been re-assessed using a combination of expert geomorphological assessment (EGA) and sediment plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:38:Report and the accompanying Appendix 5: Hydrodynamics and Sedimentary Plume Modelling of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:40:plume dispersion model are described in this section. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:44:The following assumptions have been made for the simulation of sediment plumes arising from dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:44:is a conservative approach for worst case plume effect. The dredger will actually move around the dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:44:release is a conservative approach for worst case plume effect. Recognising that the barges could actually [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:45:programme. It is important to note that this type of figure does not represent a plume or deposition that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:45:of the river channel or offshore area that will become affected by a plume or deposition at some point during [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:46:are generally slightly lower than near-bed effects, and during the dredging, all plume effects are confined to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:46:and the Oil Terminal on the north bank at the downstream end. Furthermore, all plumes associated with [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:46:bank (south of centre line) portion of the channel’s width, whilst all plumes associated with dredging of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:46:that they respectively affect. No plume effects (and by implication no deposition effects) of a significant level [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:51:bed thickness caused by the deposition of sediment from the plumes created by river dredging. It can be [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:51:sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:52:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:53:in the model at a single release point and the potential for coalescence of subsequent depositional plumes [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:53:and downstream boundaries. At the extremities of the plume extent, there are wide zones of relatively low [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:56:plume for the worst case considered (all material released at a single central point). It can be seen that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:56:the sediment plume. In reality, disposals will be at different points within the licensed area, and so such a [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:57:and shown in Figure 3-14. In keeping with the results for the plume dispersion, the updated modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:59:cause plumes of sediment to form close to the release points of material into the water column. These [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:59:plumes will disperse under wave and current action and all sediment particles suspended in the water [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1142-MLA.2020.00506.2 South Bank Quay MLV2 Appraisal of Environmental Effects.pdf]]:59:Report and the accompanying Appendix 5: Hydrodynamics and Sedimentary Plume Modelling of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf|MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf]]:25:sediment (water will cause plumes of sediment to measures for the proposed scheme in the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf|MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf]]:25:clarity) form. The plume effects arising form of dredging along the axis of the river [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf|MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf]]:25: characterised by a short-lived one time, sediment plumes occupy only [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf|MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf]]:25: • Black-headed gull ensure sediment plumes are only [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf|MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf]]:25: Subtidal coarse sediment plume effects will be observed [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf|MLA_2020_00506-MLA202000506 and MLA202000507 Final HRA .pdf]]:29: • Dredging along the axis of the River Tees will be undertaken to ensure sediment plumes are only occurring in half of the river during capital dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1139 South Bank Quay Phase 1 FIR 18 Response.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1139 South Bank Quay Phase 1 FIR 18 Response.pdf]]:2:marine water and sediment quality. However, updated sedimentary plume modelling to take account of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1139 South Bank Quay Phase 1 FIR 18 Response.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1139 South Bank Quay Phase 1 FIR 18 Response.pdf]]:2:conclusions presented within the Hydrodynamic and Sediment Plume Modelling report remain valid for [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1139 South Bank Quay Phase 1 FIR 18 Response.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1139 South Bank Quay Phase 1 FIR 18 Response.pdf]]:2:hydrodynamic and sediment plume model? [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_RFI 18.pdf|MLA_2020_00506-MLA_2020_00506_2_RFI 18.pdf]]:2: Hydrodynamic and Sediment Plume Modelling report remain valid for MLV2.” Please clarify [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-MLA_2020_00506_2_RFI 18.pdf|MLA_2020_00506-MLA_2020_00506_2_RFI 18.pdf]]:2: and sediment plume model? [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-Cefas RFI South Bank Phase 1 & 2-15.pdf|MLA_2020_00506-Cefas RFI South Bank Phase 1 & 2-15.pdf]]:1:  Revised modelling of the plume that takes into account other dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:1: to those shown in the plume model and the mean value used in the SediChem tool previously or [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:1: sediment plume modelling (document reference PC1084-RHD-SB-EN-RP-EV-1100), on page 8 it [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:3:The Hydrodynamic and Sediment Plume Modelling report (Royal HaskoningDHV, 2022) submitted in [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:3:Hydrodynamic and Sediment Plume Modelling report (Royal HaskoningDHV, 2022). As such, the model [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:3:conclusions presented within the Hydrodynamic and Sediment Plume Modelling report remain valid for [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:4:OSPAR material. As noted in Section 2.4, the Hydrodynamic and Sediment Plume Modelling report (Royal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:4:reason it is considered that the sediment plume modelling presented within the Hydrodynamic and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:4:Sediment Plume Modelling report submitted in support of MLV1 remains valid and applicable for MLV2 [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:5:and Sediment Plume Modelling report (Royal HaskoningDHV, 2022). Whilst MLV2 requests an increase [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:5:Sediment Plume Modelling report. As such, there is no change to the required durations of dredging as [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf|MLA_2020_00506-PC1084-RHD-SB-EN-NT-EV-1137-MLA.2020.00506.2 South Bank Quay Marine Licence Variation 2 RFI 17-66.pdf]]:6:Royal HaskoningDHV (2022) South Bank Quay Technical Note: Hydrodynamic and Sediment Plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-Licence Document (Marine)-45.pdf|MLA_2020_00506-Licence Document (Marine)-45.pdf]]:15: To restrict suspended sediment plumes to one side of the estuary at a time, in order to reduce loss of tern foraging habitat. [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:2: Dredging must be limited to working on one side of plumes to one side of the estuary [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:2:to migratory fish given that Environment Agency guidance recommends that the limit of any plume should [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:2:more commonly applied to temperature plumes, the Environment Agency has stated on previous projects [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:2:area of the estuary impacted by any sediment plumes resulting from dredging activities therefore this [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:2:dredging associated with the South Bank project that sediment suspended within the dredging plumes will [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:3:Linked to the relatively limited extent of the sediment plume, the EIA Report (Royal HaskoningDHV, 2020) [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:4:summarise, it is predicted that whilst the sediment plumes could combine to cover a larger area of the [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:4:extent of the cross-sectional area of the estuary as plume predictions indicate narrow plumes following [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:5:dredge plumes tend to be narrow and follow tidal flows thus indicating dredging on one side of the estuary [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:6:sensitive to dredging related sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/Return/PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf|PC1084-RHD-SB-XX-NT-Z-0001-South Bank SSC monitoring plan V3.pdf]]:8:Based on the predicted plume modelling output, the monitoring buoys are proposed to be positioned as [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-Licence Document (Marine)-58.pdf|MLA_2020_00506-Licence Document (Marine)-58.pdf]]:16: To restrict suspended sediment plumes to one side of the estuary at a time, in order to reduce loss of tern foraging habitat. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:The capital dredging of the river and the offshore disposal of dredged sediments both will cause plumes of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:sediment to form. The plume effects arising from the river dredging are characterised by a short-lived [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:following hours. Since the dredging is a near-continuous operation, the plume effects will be observed [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected from the offshore [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:magnitude over a few hours after disposal. Deposition thicknesses of sediment from the plumes on the river [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:12:exceeding water quality standards was deemed to be low. Additionally, sediment plume modelling shows [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:12:resuspension of sediments. Such measures include dredging in long strips to ensure the plume is located [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:13:scheme footprint and the results of the hydrodynamic and sediment plume modelling, an impact of minor [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:20:Based on the findings of hydrodynamic and sedimentary plume modelling, the disposal of dredged material [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:61:from the proposed dredging and disposal activity by coupling a sediment plume model built in MIKE21-MT [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:63:hydrodynamic and sedimentary regime assessment (particularly the plume dispersion modelling to [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:65:sediment plume modelling will, however, be used to inform impacts to water quality as a result of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:130:plume modelling report [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:131:Hydro-dynamic and sedimentary plume modelling [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:139: a sediment plume model built in MIKE3-MT software. The sediment plume model was run for the entire [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:193:plume dispersion model are described in this section. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:197:The following assumptions have been made for the simulation of sediment plumes arising from dredging [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:200: to note that this type of figure does not represent a plume or deposition that would occur at any one [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:200: point in time (such plumes or deposition are shown in the animated timestep plots). Rather, this [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:200: affected by a plume or deposition at some point during the 4-months of dredging or disposal [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:202:although: (i) the lateral extent of the plume (at low concentrations) becomes slightly greater; (ii) the extent [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:202:of the plume across the river channel becomes wider; and (iii) at times two plumes are created by the in- [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:203:that during Stage 3 of the dredging, the maximum plume extent and maximum SSC values within the plume [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:203:are much lower than experienced during both Stage 1 and 2 of the dredging (note the slight plume shown [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:203:commences). During Stage 3, the maximum extent of the plume is confined to within the length of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:204:that during Stage 4 of the dredging, the plume is created at the turning circle and along parts of the north [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:205:and that during the 4 months of dredging, all plume effects are confined to within the river reaches that [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:205:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:205:plumes associated with dredging of the turning circle are confined to the left bank (north of centre line) [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:205:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:207:the plumes created by river dredging. It can be seen that much of the sediment falls to the bed within the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:207:that is affected by the zone of influence from the sediment plumes. [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:208:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:208:single release point and the potential for coalescence of subsequent depositional plumes is greatest. In [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:208:a few km of the upstream and downstream boundaries. At the extremities of the plume extent, there are [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:208:sediment plume for this worst case. It can be seen that much of the sediment falls to the bed within the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:208:similar zone to the sediment plume. In reality, disposals will be at different points within the licensed area, [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:210:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:210:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:210:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:plume effects will be observed throughout much the 4-month period, but at varying extents during the four [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:different stages. During Stages 1-3 the dredging-related plume effects will be largely confined to the channel [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:During Stage 4 the dredging-related plume effects will be largely confined to the channel areas north of the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:areas covering the same spatial extent as the sediment plumes. Where this occurs in the river channel or [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf]]:385: would be supported through the use of divers. There is the possibility of sediment plumes [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf]]:386:If your activity uses or releases chemicals (for example contaminants above action level 1.There is the possibility of sediment plumes during the [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf]]:387:outside the estuary but could delay or prevent fish There is the possibility of sediment plumes during the dredging works. Possibility of [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf]]:388: There is the possibility of sediment plumes during the dredging works [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-NE formal response to SBW MLA, 29.01.21 (1)-12.pdf|MLA_2020_00506-NE formal response to SBW MLA, 29.01.21 (1)-12.pdf]]:4: To restrict suspended sediment plumes to one side of the estuary at a time, and [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-NE formal response to SBW MLA, 29.01.21 (1)-12.pdf|MLA_2020_00506-NE formal response to SBW MLA, 29.01.21 (1)-12.pdf]]:6: To restrict suspended sediment plumes to one side of the estuary at a time, in [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf]]:14:The tool requires the input of predicted suspended solids concentrations arising from the dredge plume. For [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf]]:14:predicted to last for a duration of approximately four weeks. The likely plume extent during this phase is [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf]]:16:uplift column in Appendix 2). It can be seen in Figure 2.2 that the suspended sediment plume is predicted [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf]]:17:However, sediment plume modelling does not predict long term and large scale extents of elevated [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf]]:27:suspended sediment during dredging is expected to be in the form of a narrow plume within the river, which [[this>Teesworks/Planning/MLA_2020_00506/MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf|MLA_2020_00506-PC1084-RHD-ZZ-XX-RP-Z-1115_South Bank Quay supplementary report-31.pdf]]:45:parameters, the short term nature of the sediment plume and limited spatial extent would limit any EQS [[this>Teesworks/Planning/R-2022-0342-CD/R-2022-0342-CD-10035117-AUK-XX-XX-RP-ZZ-0395-03-GE Plot.pdf|R-2022-0342-CD-10035117-AUK-XX-XX-RP-ZZ-0395-03-GE Plot.pdf]]:26:ongoing sources of ground gases. In addition, as hydrocarbon contamination or a distinct NAPL plume within [[this>Teesworks/Planning/R-2023-0246-RMM/R-2023-0246-RMM-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf|R-2023-0246-RMM-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf]]:26: increased turbulence can cause greater plume mixing. [[this>Teesworks/Planning/R-2023-0246-RMM/R-2023-0246-RMM-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf|R-2023-0246-RMM-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf]]:26: • The rise and trajectory of the plume may be depressed slightly by the flow distortion. This [[this>Teesworks/Planning/R-2023-0246-RMM/R-2023-0246-RMM-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf|R-2023-0246-RMM-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf]]:34: the quantity of pollutants emitted but also to reduce the buoyancy of the plume due to momentum. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:The capital dredging of the river and the offshore disposal of dredged sediments both will cause plumes of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:sediment to form. The plume effects arising from the river dredging are characterised by a short-lived [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:following hours. Since the dredging is a near-continuous operation, the plume effects will be observed [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected from the offshore [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:magnitude over a few hours after disposal. Deposition thicknesses of sediment from the plumes on the river [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:12:exceeding water quality standards was deemed to be low. Additionally, sediment plume modelling shows [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:12:resuspension of sediments. Such measures include dredging in long strips to ensure the plume is located [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:13:scheme footprint and the results of the hydrodynamic and sediment plume modelling, an impact of minor [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0685-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:20:Based on the findings of hydrodynamic and sedimentary plume modelling, the disposal of dredged material [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:2: the findings of hydrodynamic and sedimentary plume [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:2: sediment and create smothering effects / turbidity / sediment plumes. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:3:are predicted to occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:Capital dredging would result in the creation of sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:In all tidal conditions modelled, the lateral extent of the plume across the river channel is very narrow and [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:the magnitude of concentrations within the plume beyond a few hundred metres from the point of release is [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:in the order of 10 - 20mg/l and in the extremities of the plume, reduces further to concentrations 0-10mg/l [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:Results for this stage were similar to those in Stage 1 but with separate plumes created by the different [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:dredgers. At some points in the cycle, areas of these initially separate plumes combine as they move [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:The maximum concentrations and the spatial extents of the plume arising from Stage 3 of the dredging are [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:and the production rate of dredging is notably lower. Figure 7.5 shows an example plume during Stage 3 [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:Again, peak concentrations close to the dredger are shown in the plume modelling output. On the ebb [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:phase, the plume can extend at low concentrations (<30mg/l) along the jetties of the Oil Terminal towards [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:17:Figure 7. 3 Plume of suspended sediment concentrations arising from dredging activities during Stage 2 [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:18:Figure 7. 4 Plume arising from dredging activities during Stage 1 of the capital dredge (release from the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:19:Figure 7. 5 Plume of suspended sediment concentrations arising from dredging activities during Stage [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:20:Figure 7.6 Plume of enhanced suspended sediment concentrations arising from dredging activities [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:21:sediment plume is not predicted to reach The Gares water quality monitoring point, no effects on the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:21:The relatively limited nature of the plume extents predicted for the proposed capital dredging indicates that [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:25:Additionally, information from sediment plume modelling (see Section 7.5.1) indicates that only the Smiths [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:1:WFD water body (approximately 6.3km, see Figure 28.1) and plume modelling results described in Section [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:7: measures identified for the Tees estuary. habitats located within sediment plumes created [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11:Capital dredging within the river would result in sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: BHD working to dredge the In all tidal conditions modelled, the lateral extent of the plume across the river channel [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: upper soft material in the is very narrow and the magnitude of concentrations within the plume beyond a few [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: channel. extremities of the plume, reduces further to concentrations 0-10mg/l. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: 2 Results for this stage were similar to those in Stage 1 but with separate plumes [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: separate plumes combine as they move upstream and downstream according to the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: 3 BHD working to dredge the The maximum concentrations and the spatial extents of the plume arising from Stage [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: channel. notably lower. Plume very small and located close to the dredging activity. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: 4 Again, peak concentrations close to the dredger are shown in the plume modelling [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: output. On the ebb phase, the plume can extend at low concentrations (<30mg/l) [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:13:represent a more conservative scenario, as sediment plume modelling outlined above indicates relatively [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:13:limited plume extents for the majority of the capital dredge for the proposed scheme. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:14:Additionally, sediment plume results for Smiths Dock monitoring point (point 3) indicated only temporary [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:14:be temporary which would disperse following cessation of the works. Plume extents during each of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:16:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:17:zone of influence from the sediment plumes. As a result, a deterioration in ecological class status is not [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:18:peak migratory season, when a sediment plume creating a ‘barrier’ effect could cause a significant disruption [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:18:extent and impact of the plume. This allows a passage through which migratory fish will be able to move [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:18: dredging along the axis of the river to ensure the plumes are [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:23: • Cumulative effects of sediment plumes and associated effects on water quality and fish [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:24:Section 27 considers the potential cumulative effects of the proposed schemes on sediment plumes and [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:24:marine water quality. To summarise, whilst the sediment plumes could combine to cover a larger area of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:24:plumes spreading across the width of the channel. Additionally, due to navigational safety, it is unlikely that [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:28:strips thus limiting the plume extent. As a result, non- temporary effects on water quality and associated [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:29:would be sediment plumes associated with dredging simultaneously. However, on further consideration, [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:As the offshore disposal commences, a plume of sediment would be generated with the greatest [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:concentrations predicted at the end of the discharge period. The sediment plume is predicted to increase [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:At 30 minutes after cessation of discharge, the plume is less than 250mg/l at its localised centre, reducing [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of less than [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:commences and starts to form its own sediment plume, the initial plume has moved sufficiently far from its [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:point of release that it does not coalesce with the new plume and, by this time, is less than 40mg/l in SSC [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:at the magnitudes presented. The original plume continues to disperse such that after 4 hours and 25 [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:At times when the release is around slack water, the plume tends to reside closer to the point of release for [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:However, when this occurs the concentration in the plume reduces readily because more material falls to [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:2:Based on the modelled effects of the sediment plume at the Tees Bay C disposal site described above, it is [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-OFFICER REPORT.pdf|R-2020-0685-ESM-OFFICER REPORT.pdf]]:20:relatively limited nature of the plume extents predicted for the proposed [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-OFFICER REPORT.pdf|R-2020-0685-ESM-OFFICER REPORT.pdf]]:44:reduce both the extent and impact of the dredged plume, as any plume [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-OFFICER REPORT.pdf|R-2020-0685-ESM-OFFICER REPORT.pdf]]:92:plume at the disposal site concludes that there is limited potential for an [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-EIA_Scoping_Response_EIA201900017_FINAL.pdf|R-2020-0685-ESM-EIA_Scoping_Response_EIA201900017_FINAL.pdf]]:11:create smothering effects/turbidity/sediment plumes, thereby damaging benthic [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 16_WFD scoping tables.pdf|R-2020-0685-ESM-Appendix 16_WFD scoping tables.pdf]]:2: would be supported through the use of divers. There is the possibility of sediment plumes [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 16_WFD scoping tables.pdf|R-2020-0685-ESM-Appendix 16_WFD scoping tables.pdf]]:3:If your activity uses or releases chemicals (for example contaminants above action level 1.There is the possibility of sediment plumes during the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 16_WFD scoping tables.pdf|R-2020-0685-ESM-Appendix 16_WFD scoping tables.pdf]]:4:outside the estuary but could delay or prevent fish There is the possibility of sediment plumes during the dredging works. Possibility of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 16_WFD scoping tables.pdf|R-2020-0685-ESM-Appendix 16_WFD scoping tables.pdf]]:5: There is the possibility of sediment plumes during the dredging works [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:1:Hydro-dynamic and sedimentary plume modelling [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:9: a sediment plume model built in MIKE3-MT software. The sediment plume model was run for the entire [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:63:plume dispersion model are described in this section. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:67:The following assumptions have been made for the simulation of sediment plumes arising from dredging [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:70: to note that this type of figure does not represent a plume or deposition that would occur at any one [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:70: point in time (such plumes or deposition are shown in the animated timestep plots). Rather, this [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:70: affected by a plume or deposition at some point during the 4-months of dredging or disposal [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:72:although: (i) the lateral extent of the plume (at low concentrations) becomes slightly greater; (ii) the extent [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:72:of the plume across the river channel becomes wider; and (iii) at times two plumes are created by the in- [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:73:that during Stage 3 of the dredging, the maximum plume extent and maximum SSC values within the plume [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:73:are much lower than experienced during both Stage 1 and 2 of the dredging (note the slight plume shown [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:73:commences). During Stage 3, the maximum extent of the plume is confined to within the length of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:74:that during Stage 4 of the dredging, the plume is created at the turning circle and along parts of the north [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:75:and that during the 4 months of dredging, all plume effects are confined to within the river reaches that [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:75:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:75:plumes associated with dredging of the turning circle are confined to the left bank (north of centre line) [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:75:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:77:the plumes created by river dredging. It can be seen that much of the sediment falls to the bed within the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:77:that is affected by the zone of influence from the sediment plumes. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:78:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:78:single release point and the potential for coalescence of subsequent depositional plumes is greatest. In [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:78:a few km of the upstream and downstream boundaries. At the extremities of the plume extent, there are [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:78:sediment plume for this worst case. It can be seen that much of the sediment falls to the bed within the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:78:similar zone to the sediment plume. In reality, disposals will be at different points within the licensed area, [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:80:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:80:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:80:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:plume effects will be observed throughout much the 4-month period, but at varying extents during the four [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:different stages. During Stages 1-3 the dredging-related plume effects will be largely confined to the channel [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:During Stage 4 the dredging-related plume effects will be largely confined to the channel areas north of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:areas covering the same spatial extent as the sediment plumes. Where this occurs in the river channel or [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0685-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_20. Flood risk and coastal defence.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_20. Flood risk and coastal defence.pdf]]:4:well as hydrodynamic and sedimentary plume modelling reported in Section 6. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:4:hydrodynamic and sedimentary plume modelling undertaken. This section excludes consideration of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:20:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:20:dredging periods. The sediment plume generated by dredging would likely be dispersed by tidal currents [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:immediate vicinity of the dredger. Sediment plume modelling predicts different plume extents and [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:cases, the sediment plume is predicted to be very narrow within the river, with the phase of dredging with [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:extremities of the plume. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:All plumes associated with different stages of dredging in the vicinity of the proposed new quay are confined [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:to the southern bank of the river, whilst all plumes associated with dredging of the turning circle are confined [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:to the northern bank. No plume effects of a significant level above background values are anticipated to [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:The sediment plume modelling reported within Section 6 also extracted time series plots of changes in SSC [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:22:from the sediment plumes. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:22:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:5: Environmental Statement. modelling and modelling of sediment plume [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:7: Environmental Statement. 2014 modelling and modelling of sediment plume released from [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:10: • Sediment plume modelling: The updated and verified 3D Tees Estuary Tidal Model was used to [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:10: coupling with a sediment plume model built in MIKE21-MT software. The sediment plume model [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:41:offshore site will both result in sediment plumes. These effects have been investigated using numerical [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:41:changes in bed thickness when the suspended sediment falls from the plume to become deposited on the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42: represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42: become affected by a plume at some point during the dredging or disposal activities (in some areas [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:or river channel). To illustrate this, Figures 6.32 – 6.35 shows the maximum extent of the plume during a [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:When the dredger is at the south-western end of the transect, the maximum spatial extent of the plume on [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:Middlesbrough Dock. When the dredger is at the north-eastern end of the transect, the extent of the plume [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:new quay. However, in all cases considered, the lateral extent of the plume across the river channel is very [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:narrow and the magnitude of the SSC within the plume beyond a few hundred metres from the point of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:release is of the order of 10 to 20mg/l and in the extremities of the plume reduces further to the same order [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:43:Figure 6.32 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:44:Figure 6.33 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:45:Figure 6.34 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:46:Figure 6.35 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:47:Results from this scenario are broadly similar to those from Stage 1, but now separate plumes are created [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:47:plumes can coalesce and collectively occupy around half the width of the river channel as they move [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:48:Figure 6.37 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:49:Figure 6.38 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:49:plume (at low concentrations) becomes slightly greater; (ii) the extent of the plume across the river channel [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:49:becomes wider; and (iii) at times two plumes are created by the in-parallel dredging activities. Despite these [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:50:Figures 6.40 – 6.43 shows the maximum extent of the plume during a release from the south-western corner [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:50:and the spatial extents of the plume arising from Stage 3 of the dredging are much lower than those [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:51:Figure 6.40 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:52:Figure 6.41 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:53:Figure 6.42 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:54:Figure 6.43 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:54:the maximum plume extent and maximum SSC values within the plume are much lower than experienced [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:54:during both Stages 1 and 2 of the dredging (note the slight plume shown in the mid channel is a remnant of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:54:maximum extent of the plume is confined to within the length of the proposed quay and covers only a very [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:55:phase of the tide). Figure 6.45 and 6.46 shows the maximum extent of the plume during a release from the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:55:On the ebb phase, the plume can extend at low (<30mg/l) concentrations along the jetties of the Oil Terminal [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:55:Depot. Under no conditions does the plume enter Tees Dock at any significant concentration. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:56:Figure 6.45 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:57:Figure 6.46 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:57:the plume is created at the turning circle and along parts of the north bank of the river. As with previous [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:58:The sediment plumes that arise from the four stages of the dredging could potentially affect areas of riverbed [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:58:that during the predicted four months of dredging, all individual or coalesced plume effects are confined to [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:58:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:58:whilst all plumes associated with dredging of the turning circle are confined to the left bank (north of centre [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:59:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:60:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:60:zone of influence from the sediment plumes. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:61:Within this maximum zone of influence from sediment plumes and bed deposition, the following receptors [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:62:elevations in SSC drop rapidly after each dredging plume has dispersed, and return to baseline levels at [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:the 10-minute duration of disposal activity; and (iii) at selected intervals thereafter until the initial plume [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. It can then [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:This plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:At 30 minutes after cessation of discharge (Plot F), the plume is less than 250mg/l at its localised centre, [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:phase of the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:activity commences and starts to form its own sediment plume (Plot H), the initial plume has moved [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:sufficiently far from its point of release that it does not coalesce with the new plume and, by this time, is less [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:not visible in the plots at the magnitudes presented. The original plume continues to disperse such that [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:although when the discharge is made during the flooding tide, the plume moves in a south-easterly direction, [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:along the axis of principal tidal flows. At times when the release is around slack water, the plume tends to [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:west or south-east, respectively). However, when this occurs the concentration in the plume reduces readily [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:69:Figure 6.60 Plume of enhanced SSCs arising from disposal activities during Stage 1 of the capital [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:from the BHD (although the time intervals are greater), the initial plume has greater SSC values at its centre, [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:case for maximum SSC), the plume resides in spatial extent around the point of release during the slack [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:plume has started to move towards the south-east through advection by the flood tidal currents, and the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:release point (Plot F). At this point in time, the TSHD plume has further reduced in peak concentration to [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:around 200mg/l. Some 30 minutes later, the TSHD plume and subsequent BHD plume have fully coalesced, [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:with two peaks in concentration; the original TSHD plume has a peak now around 100mg/l locally at its [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:centre whilst the more recently formed (but smaller) BHD plume has a peak SSC value at its centre of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:previous TSHD release, the now fully coalesced plume has a peak SSC of around 100mg/l very locally and [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:plume remains present a further 45 minutes later, the original coalesced plume is considerably smaller in [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:successive disposal events, any coalescence of subsequent plumes would continue to result in only [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:coalescence of successive plumes at significant concentrations or for long durations is very low even during [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:71:Figure 6.61 Plume of enhanced SSCs arising from disposal activities during Stage 2 of the capital [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:72:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. The [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:72:plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:72:The plumes associated with Stage 3 disposal activities are generally lower in concentration than those for [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:72:Indeed, the plume arising from Stage 3 disposal activities fully disperses before the next subsequent [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:72:in this offshore area). Due to this, there is no possibility of plumes coalescing from Stage 3 disposal [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:73:Figure 6.4 Plume of enhanced SSCs arising from disposal activities during Stage 3 of the capital [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:Like during Stage 2, there is potential for the plume from a TSHD discharge to coalesce with a preceding or [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:Plot A shows the residual plume from a TSHD disposal some 5 minutes before the commencement of a [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:separate plumes at 45 minutes after cessation of the BHD discharge. A further 30 minutes later, another [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:TSHD release occurs within the previous BHD plume extent (Plot E). Peak concentrations from the TSHD [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:plume has widely dispersed, a further BHD release is made some 50 minutes later, again within the previous [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:(now coalesced) plumes. Despite this coalesced plume now containing elements of three separate [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:the residual plume shown in Plot A coalesce with the ‘three-release’ plume (Plot G), although the SSC [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:values at the point of overlap are very low (~10mg/l). Around 55 minutes later, the plume is now mostly [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:disposal site, leading to coalescence of subsequent plumes, the resulting temporary, short duration effects [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:75:Figure 6.5 Plume of enhanced SSCs arising from disposal activities during Stage 4 of the capital [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:76:for coalescence of subsequent plumes is greatest. In reality, subsequent disposals will be at different parts [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:76:At the extremities of the plume extent, there are wide zones of relatively low SSC values (<100mg/l). [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:76:sediment plume associated with one release event (this example being from Stage 1). It can be seen that [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:76:is negligible, whilst to the north it covers a similar zone to the sediment plume for this disposal event, which [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:80:the northern and southern boundaries (Figure 6.68). This correlates to the areas where a plume will extend [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:plume effects will be observed throughout much of the approximately four-month period, but at varying [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:extents during the four different stages. During Stages 1-3 the dredging-related plume effects will be largely [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:Dock and Tees Dock. During Stage 4 the dredging-related plume effects will be largely confined to the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:very minor magnitudes, in areas covering the same spatial extent as the sediment plumes. Where this [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:27:In summary, the largest sediment plumes are likely to arise during Stage 2 of the dredging (i.e. BHD and [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:27:(it is not a sediment plume, rather a combined zone of influence). The sediment dispersion modelling of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:27:distance from the dredging vessel, both laterally and along the line of the vessel, with plumes diminishing [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:27:of this assessment, the sediment plume may be regarded as representing a temporary loss of foraging [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:28:terns do not forage to any significant extent within the predicted range of the sediment plume. Likewise, the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:28:England, 2018a), and the area likely to be affected by the sediment plume at any one time represents around [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:28:available even if the plume does result in temporary occlusion from the affected area. Furthermore, SSC [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:29:and the other stages of the dredge campaign would result in a smaller plume than that described for Stage [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:29: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:29: plume generated by operations is predicted to collectively occupy around half the width of the river [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:29:With the implementation of the above mitigation measure, the modelled plume would only occupy half of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_11. Terrestrial ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_11. Terrestrial ecology.pdf]]:13: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_11. Terrestrial ecology.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_11. Terrestrial ecology.pdf]]:14: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-61586 Quay Planning Statement 09-11-20.pdf|R-2020-0685-ESM-61586 Quay Planning Statement 09-11-20.pdf]]:24: sediment plume modelling, an impact of minor adverse significance is predicted with regard to [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-61586 Quay Planning Statement 09-11-20.pdf|R-2020-0685-ESM-61586 Quay Planning Statement 09-11-20.pdf]]:30: Additionally, sediment plume modelling shows relatively limited areas of high suspended solids [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-61586 Quay Planning Statement 09-11-20.pdf|R-2020-0685-ESM-61586 Quay Planning Statement 09-11-20.pdf]]:30: dredging in long strips to ensure the plume is located only on one side of the channel at a time [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_1. Introduction.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_1. Introduction.pdf]]:8:5 Hydrodynamic and sedimentary plume modelling report [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_30. References.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_30. References.pdf]]:6:sediment plumes arising from dredging. Construction Industry Research and Information Association [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:1: influencing the same area as affected by the sediment plume); and, [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:2:the basis of the potential extent of the dredging and disposal plumes. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:11:All projects scoped into the CIA involve will involve capital dredging. This activity will create a plume of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:11:The extent of the sediment plume created by capital dredging is heavily dependent on the dredging plant [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:important to note that figures showing the “maximum extent of sediment plume dispersion and deposition” [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:do not represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:affected by a plume at some point during the dredging or disposal activities (in some areas this will be on a [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:Consequently, for the purposes of this CIA, the maximum zones of influence of sediment plume dispersion [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:of sediment plume dispersion and deposition onto the river and/or seabed during capital dredging [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:sediment in the water column was predicted to be in close proximity to the dredger, with plume dispersion [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:resulting in a significantly reduced concentration of suspended sediment beyond the source of the plume. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:material will be re-dredged as part of the capital works for each scheme. At the peripheries of each plume, [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:13:(right) as a result of the proposed scheme [Note: plots show sediment plume impacts arising from dredging [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:17:addition, the predictions made for each project represent sediment plume dispersion under specific tidal [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:17:where sediment plumes combine at peak concentration (as predicted by the EIA studies for each project) [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:17:at any location. Additionally, mitigation is outlined for all three schemes which would reduce plume extents [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:17:proposed scheme, it is considered unlikely that the plumes would overlap. As a result, there may be a [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:17:additional mitigation measures are identified to reduce any resulting sediment plume as far as possible and [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:18:plumes. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:18:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:24:plumes occupy only half of the river cross section) has also been proposed for the NGCT project. For the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:24:England, 2018a), the area affected even by the combined plumes is likely to be low (for example, should [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:24:dredging plumes together will still affect only around 0.5% of the SPA subtidal habitat (Royal [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:24:HaskoningDHV, 2015)). However, the additive effect of the sediment plumes from separate dredging [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:25:sediment plumes may deter such species from migrating to and from spawning sites. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:25:the respective sediment plumes could result in an additive effect, as demonstrated in Figures 27.1 to 27.3. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:25:Significantly, the effect of a combined plume is not likely to result in a different behavioural response in fish [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:25:compared with the effect of the projects in isolation, although the increased plume footprint may increase [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:25:of the sediment plumes from separate dredging campaigns cannot be completely avoided if the campaigns [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:9:proposed scheme nor the modelled extent of the maximum-expected sediment plume from the capital [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:9:influence of the proposed scheme will be determined by the sediment plume during dredging activities. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:22:The capital dredging of the river will cause plumes of sediment to form. The plume effects arising from the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:22:operation, the plume effects will be observed throughout much of the approximately five-month period, but [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:22:of sediment from the plumes on the river or seabed will be very small. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:25:requires use of TSHD and BHD on soft sediment in the channel and berth pocket) will result in plumes of [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:25:with plumes diminishing typically to levels of <30 mg/l but often <10mg/l at a distance of no more than a few [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:25:England, 2018a). The area affected by the sediment plume generated from proposed dredging, though [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:30:In terms of intra-project effects on foraging common terns, the zone of influence from the sediment plume [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:30:of the area would not be increased since the plume is considered to be the most far-reaching effect on tern [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:33:Effects on fish may be compounded by the combined sediment plumes of other projects or plans that may [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:34:An interaction between the sediment plumes would only occur in the unlikely event that the capital dredging [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:34:Plumes from each project would be temporary and short-lived. The same applies for the Anglo American [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:34:combined plumes is expected to be minor. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:34:sediment plumes occupy only half of the river cross section) has also been proposed for the NGCT project. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:36:The zone of influence from predicted sediment plumes (including the combined plumes from the proposed [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf|R-2020-0685-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf]]:11:from the proposed dredging and disposal activity by coupling a sediment plume model built in MIKE21-MT [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf|R-2020-0685-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf]]:13:hydrodynamic and sedimentary regime assessment (particularly the plume dispersion modelling to [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf|R-2020-0685-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf]]:15:sediment plume modelling will, however, be used to inform impacts to water quality as a result of the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:3:informed by the hydrodynamic and sedimentary plume modelling undertaken, as well as the understanding [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:12:details of the increase in SSC, including the visual output of sediment plume modelling for the capital [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:13:sediment plume creating a ‘barrier’ effect could cause a significant disruption to the annual migration pattern, [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:13:during a period of very hot and dry weather. Modelling of the sediment plume during capital dredging [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14:vessel, both laterally and along the line of the vessel. The periphery of the plume (10 to 20 mg/l) extends [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14:The cross section of the river channel affected by the plume is particularly relevant when considering [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14:narrow plume along the axis of the river. [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14:period. However, while unlikely, it has to be taken into account that sediment plumes encompassing the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14: plume generated by operations is predicted to remain on the same side of the river as the [[this>Teesworks/Planning/R-2020-0685-ESM/R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0685-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14:Mitigation of the plume effects by reducing the size of the TSHD, and thus reducing the rate of overflow, is [[this>Teesworks/Planning/R-2021-0855-CD/R-2021-0855-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02_SB_DQRA_Part1.pdf|R-2021-0855-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02_SB_DQRA_Part1.pdf]]:21:plume located north towards the River Tees from the SBA_AUK_BH110 area is present. The NAPL was found [[this>Teesworks/Planning/R-2021-0855-CD/R-2021-0855-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02_SB_DQRA_Part1.pdf|R-2021-0855-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02_SB_DQRA_Part1.pdf]]:28:groundwater plume originating from a localised source. Further higher concentrations were measured in the [[this>Teesworks/Planning/R-2021-0855-CD/R-2021-0855-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02_SB_DQRA_Part1.pdf|R-2021-0855-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02_SB_DQRA_Part1.pdf]]:29:In groundwater, a more distinct plume is evident in the vicinity of the SBCO area and southern SBA boundary, [[this>Teesworks/Planning/R-2021-0855-CD/R-2021-0855-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02_SB_DQRA_Part1.pdf|R-2021-0855-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02_SB_DQRA_Part1.pdf]]:40:Although the distribution of free and total cyanide does not form such an apparent plume-like distribution in [[this>Teesworks/Planning/R-2021-0855-CD/R-2021-0855-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02_SB_DQRA_Part1.pdf|R-2021-0855-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02_SB_DQRA_Part1.pdf]]:41:area and maybe associated with the plume. [[this>Teesworks/Planning/R-2022-0205-SC/R-2022-0205-SC-Bran Sands EIA Screening Request_FINAL reduced signed.pdf|R-2022-0205-SC-Bran Sands EIA Screening Request_FINAL reduced signed.pdf]]:42: resuspension and deposition of sediments and potentially formation of sediment plumes [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf]]:845:Plume thickness 11.55 Assumed to be equal to the saturated aquifer thickness [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf]]:853: Initial contaminant concentration in groundwater at plume core C0 1.00E+00 mg/l 0 10 20 30 40 50 60 15.0 2.41E-01 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf]]:853: Width of plume in aquifer at source (perpendicular to flow) Sz 6.50E+02 m 22.5 1.18E-01 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf]]:853: Plume thickness at source Sy 1.16E+01 m Dispersivity 0 Note graph assumes plume disperses vertically in one direction only. An alternative 25.0 9.31E-02 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf]]:853: Saturated aquifer thickness da 1.16E+01 m Define dispersivity (click brown cell and use pull down list) Dispersivi 1 solution assuming the centre of the plume is located at the mid-depth of the aquifer is 27.5 7.34E-02 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf]]:854: Initial contaminant concentration in groundwater at plume core C0 1.00E+00 mg/l 00 1050 20 100 30 150 40 200 50 250 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf]]:854: Width of plume in aquifer at source (perpendicular to flow) Sz 6.50E+02 m 90.0 3.66E-03 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf]]:854: Plume thickness at source Sy 1.16E+01 m Dispersivit 0 Note graph assumes plume disperses vertically in one direction only. An alternative 100.0 1.96E-03 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-02-LWoW_DQRA.pdf]]:854: Saturated aquifer thickness da 1.16E+01 m Define dispersivity (click brown cell and use pull down list) Dispersivi 1 solution assuming the centre of the plume is located at the mid-depth of the aquifer is 110.0 1.05E-03 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf]]:975:Plume thickness 11.55 Assumed to be equal to the saturated aquifer thickness [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf]]:983: Initial contaminant concentration in groundwater at plume core C0 1.00E+00 mg/l 0 10 20 30 40 50 60 15.0 2.41E-01 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf]]:983: Width of plume in aquifer at source (perpendicular to flow) Sz 6.50E+02 m 22.5 1.18E-01 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf]]:983: Plume thickness at source Sy 1.16E+01 m Dispersivity based on Xu0& EcksteinNote graph assumes plume disperses vertically in one direction only. An alternative [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf]]:983: 1 0.1% of pathway length the centre of the plume is located at the mid-depth of the aquifer is 27.5 7.34E-02 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf]]:984: Initial contaminant concentration in groundwater at plume core C0 1.00E+00 mg/l 00 1050 20 100 30 150 40 200 50 250 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf]]:984: Width of plume in aquifer at source (perpendicular to flow) Sz 6.50E+02 m 90.0 3.66E-03 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf]]:984: Plume thickness at source Sy 1.16E+01 m Dispersivity based on Xu 0 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf]]:984: (1995)graph assumes plume disperses vertically in one direction only. An alternative 100.0 1.96E-03 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-03-LWoW_DQRA.pdf]]:984: Dispersivities 10%, 1%,10.1% of pathway length the centre of the plume is located at the mid-depth of the aquifer is 110.0 1.05E-03 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf]]:175:Plume thickness 11.55 Assumed to be equal to the sat [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf]]:183: Initial contaminant concentration in groundwater at plume core C0 1.00E+00 mg/l 0 10 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf]]:183: Width of plume in aquifer at source (perpendicular to flow) Sz 6.50E+02 m [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf]]:183: Plume thickness at source Sy 1.16E+01 m Dispersivit 0 Note graph assumes plume disp [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf]]:184: Initial contaminant concentration in groundwater at plume core C0 1.00E+00 mg/l 00 1050 [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf]]:184: Width of plume in aquifer at source (perpendicular to flow) Sz 6.50E+02 m [[this>Teesworks/Planning/R-2021-1048-FFM/R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf|R-2021-1048-FFM-10035117-AUK-XX-XX-RP-ZZ-0428-01-Net_Zero_DQRA.pdf]]:184: Plume thickness at source Sy 1.16E+01 m Dispersivity 0 Note graph assumes plume disp [[this>Teesworks/Planning/R-2020-0357-OOM/R-2020-0357-OOM-South Industrial ES - Vol 2 - Chapter F - July 2020.pdf|R-2020-0357-OOM-South Industrial ES - Vol 2 - Chapter F - July 2020.pdf]]:8: • Visible dust plumes; [[this>Teesworks/Planning/R-2020-0357-OOM/R-2020-0357-OOM-South Industrial ES - Vol 2 - Chapter L - July 2020.pdf|R-2020-0357-OOM-South Industrial ES - Vol 2 - Chapter L - July 2020.pdf]]:27: the power station and chimney stack, with plumes of steam emerging into the skyline. Nearby [[this>Teesworks/Planning/R-2019-0767-OOM/R-2019-0767-OOM-2019s0951 - Energy Recovery Facility Environmental Statement.pdf|R-2019-0767-OOM-2019s0951 - Energy Recovery Facility Environmental Statement.pdf]]:35: the condenser tubes, so there is no visible plume. [[this>Teesworks/Planning/R-2019-0767-OOM/R-2019-0767-OOM-REP-1011778-AQ-CR-20200306-Grangetown Prairie Energy from Waste-AQA-R02.pdf|R-2019-0767-OOM-REP-1011778-AQ-CR-20200306-Grangetown Prairie Energy from Waste-AQA-R02.pdf]]:11:The potential for plume visibility has not been considered in this stage. [[this>Teesworks/Planning/R-2019-0767-OOM/R-2019-0767-OOM-REP-1011778-AQ-CR-20200306-Grangetown Prairie Energy from Waste-AQA-R02.pdf|R-2019-0767-OOM-REP-1011778-AQ-CR-20200306-Grangetown Prairie Energy from Waste-AQA-R02.pdf]]:85:Entrainment of the plume into the wake of the buildings has been taken into account by including the buildings [[this>Teesworks/Planning/R-2019-0767-OOM/R-2019-0767-OOM-Chapter 8 WFD Assessment.pdf|R-2019-0767-OOM-Chapter 8 WFD Assessment.pdf]]:15: visible plume. [[this>Teesworks/Planning/R-2019-0767-OOM/R-2019-0767-OOM-Chapter 8 WFD Assessment.pdf|R-2019-0767-OOM-Chapter 8 WFD Assessment.pdf]]:32: o Visual monitoring to see if water colour has changed or if a plume is [[this>Teesworks/Planning/R-2019-0767-OOM/R-2019-0767-OOM-20191201 ERF Planning DAS_Issued.pdf|R-2019-0767-OOM-20191201 ERF Planning DAS_Issued.pdf]]:10: cooled condenser has fans which draw air across the condenser tubes, so there is no visible plume. [[this>Teesworks/Planning/R-2019-0767-OOM/R-2019-0767-OOM-Non Technical Summary_Final.pdf|R-2019-0767-OOM-Non Technical Summary_Final.pdf]]:5:condenser has fans which draw air across the condenser tubes, so there is no visible plume. [[this>Teesworks/Planning/R-2020-0743-CD/R-2020-0743-CD-10035117-AUK-XX-XX-RP-ZZ-0181-MPA_ROA and Strategy.pdf|R-2020-0743-CD-10035117-AUK-XX-XX-RP-ZZ-0181-MPA_ROA and Strategy.pdf]]:47:plume dimensions) large treatment zones routinely accept waste types [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:3:7. ASSESSMENT OF AIR QUALITY IMPACTS - PLUME VISIBILITY 117 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:3: 7.1. Forecast Visible Plumes 117 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:5:Table 29: Predicted Visible Plumes 117 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:5:Table 30: 10-100th Percentile Plume Lengths 118 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:5:Table 31: Screening Criteria for Plume Visibility 119 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:11: • to assess plume visibility; [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:14: buildings, dry deposition fluctuations and visible plumes. The model results have been [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:14:2.1.3. ADMS 5.2 is a new generation Gaussian plume air dispersion model, which means that the [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:48: • plume visibility from the Installation; [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:50: occur when a plume from an elevated source affects airborne concentrations experienced [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34:7. ASSESSMENT OF AIR QUALITY IMPACTS - PLUME VISIBILITY [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34:7.1. Forecast Visible Plumes [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34:7.1.1. This section of the report describes the potential visible plume impacts from the [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: Installation’s A1 and A2 stack. A plume will become visible when water vapour in the plume [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: condenses to form small particles in the form of water droplets. A plume is defined as [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: “visible” if the liquid water content of the plume at the centreline exceeds 0.000015 kg/kg [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: and is defined to have grounded if the vertical spread of the plume is larger than the plume [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: the plume in kg/kg (i.e., the mass of water vapour per unit mass of dry release at the source) [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34:7.1.3. Plume visibility for the main stack was assessed for the 5 years of observed met data and [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: required for plume visibility calculation. [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34:7.1.4. The modelled lengths of visible vapour plumes are provided in Table 29 for all hours – [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: Table 29: Predicted Visible Plumes [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: Visible Plumes [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: Visible Plumes [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: visible plumes 73.83 78.77 80.82 73.64 70.11 36.40 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: visible plume 405.46 447.61 499.83 412.44 370.35 297.71 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34:7.1.5. The results of the plume visibility assessment concluded that visible plumes will only occur [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: for a maximum of 35% of the hours in a year. The maximum length of a visible plume from [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: the Installation is 499.83m. However, for the worst-case met year, average visible plumes [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34:7.1.6. It is also important to consider how often the plumes of varying length will be present for. [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:34: Table 30 provides the 10-100th Percentile plume lengths for each met year considered. All [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: Table 30: 10-100th Percentile Plume Lengths [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 10th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 20th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 30th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 40th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 50th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 60th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 70th Percentile Plume Length 9 9 16 10 14 0 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 80th Percentile Plume Length 39 47 54 42 43 0 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 85th Percentile Plume Length 59 67 73 61 62 0 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 90th Percentile Plume Length 89 90 98 87 87 19 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 95th Percentile Plume Length 141 139 144 137 135 42 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 98th Percentile Plume Length 202 216 215 202 195 68 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 99th Percentile Plume Length 251 266 267 241 238 92 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 100th Percentile Plume Length 405 448 500 412 370 298 [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35:7.1.7. The results in Table 30 show that for 60% of all hours, no visible plume is forecast to occur. [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: When visible, the plume length is predicted to be short, with a maximum plume length of [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35:7.1.8. The plume is forecast to extend to a length of up to 144m for the 95th Percentile and, when [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: 2.12.) the visible plume would remain within the Installation’s boundary for the majority of [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: circa 90m to the north of the A1 and A2 emission points, the maximum visible plume, [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: regardless of plume direction, would remain within the Installation’s boundary 85% of the [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:35: stacks. Consequently, as demonstrated by the 99th Percentile in Table 30, the plume would [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36:7.1.11. In the absence of EA specific guidance on plume visibility, SEPA’s H1 guidance32, has been [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: used to assess the impact of plume visibility. The screening criteria used is provided in [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: Table 31: Screening Criteria for Plume Visibility [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: Insignificant • Plume length exceeds boundary less than 5% of daylight hours per year [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: Low • Plume length exceeds boundary less than 5% of daylight hours per year [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: Medium • Plume length exceeds boundary for more than 5% of daylight hours per year [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: High • Plume length exceeds boundary more than 25% of daylight hours per year [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: in Tables 29 and 30. For 60% of daylight hours, no visible plume is forecast to occur. When [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: visible, the plume length is predicted to be short, with a maximum plume length of around [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36:7.1.14. For daylight hours, the plume is forecast to extend to a length of up to 152m for the 95th [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: consideration (see Section 2.12.) the visible plume would remain within the Installation’s [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36:7.1.15. The maximum visible plume, regardless of plume direction, would remain within the [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: Installation’s boundary 85% of the time, with a visible plume length of 77m for the 85th [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: HSR1) the 99th Percentile visible plume length for daylight hours would only extend to this [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36:7.1.17. Consequently, based on the SEPA criteria, the impact of the visible plume for daylight hours [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:36: • the plume is visible 34% of the time; [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:37: • the plume length exceeds the nearest point of the site boundary distance for more [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:37: industrial land use. Visible plumes would not extend to the vast majority of the human [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:37: receptor locations assessed and only very seldom would plumes be visible at HSR1. [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:37:7.1.19. Consequently, it is likely that the impact of visible plumes could be considered insignificant. [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:92:11.1.7. An assessment of plume visibility was also undertaken which included daytime and night [[this>Teesworks/Planning/R-2023-0224-CD/R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf|R-2023-0224-CD-ECL.007.04.01_ADM - Issue 1a (2 of 3).pdf]]:92: time hours. When daylight hours only were considered, visible plumes would only occur [[this>Teesworks/Planning/R-2020-0820-ESM/R-2020-0820-ESM-Lackenby ES - Vol 2 - Chapter E - Air Quality - Dec 2020.pdf|R-2020-0820-ESM-Lackenby ES - Vol 2 - Chapter E - Air Quality - Dec 2020.pdf]]:10: development are dust deposition, resulting in the soiling of surfaces; visible dust plumes; [[this>Teesworks/Planning/R-2020-0820-ESM/R-2020-0820-ESM-Lackenby ES - Vol 2 - Chapter J - LVIA - Dec 2020.pdf|R-2020-0820-ESM-Lackenby ES - Vol 2 - Chapter J - LVIA - Dec 2020.pdf]]:28: station and chimney stack, with plumes of steam emerging into the skyline. Nearby Errington [[this>Teesworks/Planning/R-2020-0820-ESM/R-2020-0820-ESM-Lackeny - Planning Statement - Dec 2020.pdf|R-2020-0820-ESM-Lackeny - Planning Statement - Dec 2020.pdf]]:42: development are dust deposition, resulting in the soiling of surfaces; visible dust plumes; [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:3:7. ASSESSMENT OF AIR QUALITY IMPACTS - PLUME VISIBILITY 117 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:3: 7.1. Forecast Visible Plumes 117 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:5:Table 29: Predicted Visible Plumes 117 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:5:Table 30: 10-100th Percentile Plume Lengths 118 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:5:Table 31: Screening Criteria for Plume Visibility 119 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:11: • to assess plume visibility; [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:14: buildings, dry deposition fluctuations and visible plumes. The model results have been [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:14:2.1.3. ADMS 5.2 is a new generation Gaussian plume air dispersion model, which means that the [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:48: • plume visibility from the Installation; [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:50: occur when a plume from an elevated source affects airborne concentrations experienced [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126:7. ASSESSMENT OF AIR QUALITY IMPACTS - PLUME VISIBILITY [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126:7.1. Forecast Visible Plumes [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126:7.1.1. This section of the report describes the potential visible plume impacts from the [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: Installation’s A1 and A2 stack. A plume will become visible when water vapour in the plume [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: condenses to form small particles in the form of water droplets. A plume is defined as [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: “visible” if the liquid water content of the plume at the centreline exceeds 0.000015 kg/kg [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: and is defined to have grounded if the vertical spread of the plume is larger than the plume [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: the plume in kg/kg (i.e., the mass of water vapour per unit mass of dry release at the source) [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126:7.1.3. Plume visibility for the main stack was assessed for the 5 years of observed met data and [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: required for plume visibility calculation. [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126:7.1.4. The modelled lengths of visible vapour plumes are provided in Table 29 for all hours – [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: Table 29: Predicted Visible Plumes [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: Visible Plumes [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: Visible Plumes [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: visible plumes 73.83 78.77 80.82 73.64 70.11 36.40 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: visible plume 405.46 447.61 499.83 412.44 370.35 297.71 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126:7.1.5. The results of the plume visibility assessment concluded that visible plumes will only occur [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: for a maximum of 35% of the hours in a year. The maximum length of a visible plume from [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: the Installation is 499.83m. However, for the worst-case met year, average visible plumes [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126:7.1.6. It is also important to consider how often the plumes of varying length will be present for. [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:126: Table 30 provides the 10-100th Percentile plume lengths for each met year considered. All [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: Table 30: 10-100th Percentile Plume Lengths [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 10th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 20th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 30th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 40th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 50th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 60th Percentile Plume Length 0 0 0 0 0 0 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 70th Percentile Plume Length 9 9 16 10 14 0 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 80th Percentile Plume Length 39 47 54 42 43 0 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 85th Percentile Plume Length 59 67 73 61 62 0 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 90th Percentile Plume Length 89 90 98 87 87 19 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 95th Percentile Plume Length 141 139 144 137 135 42 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 98th Percentile Plume Length 202 216 215 202 195 68 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 99th Percentile Plume Length 251 266 267 241 238 92 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 100th Percentile Plume Length 405 448 500 412 370 298 [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127:7.1.7. The results in Table 30 show that for 60% of all hours, no visible plume is forecast to occur. [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: When visible, the plume length is predicted to be short, with a maximum plume length of [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127:7.1.8. The plume is forecast to extend to a length of up to 144m for the 95th Percentile and, when [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: 2.12.) the visible plume would remain within the Installation’s boundary for the majority of [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: circa 90m to the north of the A1 and A2 emission points, the maximum visible plume, [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: regardless of plume direction, would remain within the Installation’s boundary 85% of the [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:127: stacks. Consequently, as demonstrated by the 99th Percentile in Table 30, the plume would [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128:7.1.11. In the absence of EA specific guidance on plume visibility, SEPA’s H1 guidance32, has been [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: used to assess the impact of plume visibility. The screening criteria used is provided in [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: Table 31: Screening Criteria for Plume Visibility [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: Insignificant • Plume length exceeds boundary less than 5% of daylight hours per year [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: Low • Plume length exceeds boundary less than 5% of daylight hours per year [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: Medium • Plume length exceeds boundary for more than 5% of daylight hours per year [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: High • Plume length exceeds boundary more than 25% of daylight hours per year [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: in Tables 29 and 30. For 60% of daylight hours, no visible plume is forecast to occur. When [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: visible, the plume length is predicted to be short, with a maximum plume length of around [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128:7.1.14. For daylight hours, the plume is forecast to extend to a length of up to 152m for the 95th [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: consideration (see Section 2.12.) the visible plume would remain within the Installation’s [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128:7.1.15. The maximum visible plume, regardless of plume direction, would remain within the [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: Installation’s boundary 85% of the time, with a visible plume length of 77m for the 85th [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: HSR1) the 99th Percentile visible plume length for daylight hours would only extend to this [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128:7.1.17. Consequently, based on the SEPA criteria, the impact of the visible plume for daylight hours [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:128: • the plume is visible 34% of the time; [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:129: • the plume length exceeds the nearest point of the site boundary distance for more [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:129: industrial land use. Visible plumes would not extend to the vast majority of the human [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:129: receptor locations assessed and only very seldom would plumes be visible at HSR1. [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:129:7.1.19. Consequently, it is likely that the impact of visible plumes could be considered insignificant. [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:184:11.1.7. An assessment of plume visibility was also undertaken which included daytime and night [[this>Teesworks/Planning/R-2023-0253-RMM/R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf|R-2023-0253-RMM-ECL.007.04.01_ADM - Issue 1a (1 of 3).pdf]]:184: time hours. When daylight hours only were considered, visible plumes would only occur [[this>Teesworks/Planning/R-2021-0943-CD/R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001_CEMP_A (Fit for Construction)_C03.pdf|R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001_CEMP_A (Fit for Construction)_C03.pdf]]:28:and the results of the hydrodynamic and sediment plume modelling, the EIA has predicted an impact [[this>Teesworks/Planning/R-2021-0943-CD/R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001_CEMP_A (Fit for Construction)_C03.pdf|R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001_CEMP_A (Fit for Construction)_C03.pdf]]:51: plumes of sediment to form. The plume effects arising from the river dredging are characterised by [[this>Teesworks/Planning/R-2021-0943-CD/R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001_CEMP_A (Fit for Construction)_C03.pdf|R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001_CEMP_A (Fit for Construction)_C03.pdf]]:51: in concentration over following hours. Since the dredging is a near-continuous operation, the plume [[this>Teesworks/Planning/R-2021-0943-CD/R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001_CEMP_A (Fit for Construction)_C03.pdf|R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001_CEMP_A (Fit for Construction)_C03.pdf]]:51: plume modelling shows relatively limited areas of high suspended solids concentrations, which only [[this>Teesworks/Planning/R-2021-0943-CD/R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001_CEMP_A (Fit for Construction)_C03.pdf|R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001_CEMP_A (Fit for Construction)_C03.pdf]]:51: environmental quality standard (EQS) during capital dredging. However, sediment plume modelling [[this>Teesworks/Planning/R-2021-0943-CD/R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001.pdf|R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001.pdf]]:28:and the results of the hydrodynamic and sediment plume modelling, the EIA has predicted an impact [[this>Teesworks/Planning/R-2021-0943-CD/R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001.pdf|R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001.pdf]]:51: plumes of sediment to form. The plume effects arising from the river dredging are characterised by [[this>Teesworks/Planning/R-2021-0943-CD/R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001.pdf|R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001.pdf]]:51: in concentration over following hours. Since the dredging is a near-continuous operation, the plume [[this>Teesworks/Planning/R-2021-0943-CD/R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001.pdf|R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001.pdf]]:51: plume modelling shows relatively limited areas of high suspended solids concentrations, which only [[this>Teesworks/Planning/R-2021-0943-CD/R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001.pdf|R-2021-0943-CD-SBQ1-GCL-ENV-SBKXX-PL-WM-000001.pdf]]:51: environmental quality standard (EQS) during capital dredging. However, sediment plume modelling [[this>Teesworks/Planning/R-2023-0291-ESM/R-2023-0291-ESM-SOL_23_P016_GLR Statement of Community Engagement Annex 3.C - Online Public Consultation Page.pdf|R-2023-0291-ESM-SOL_23_P016_GLR Statement of Community Engagement Annex 3.C - Online Public Consultation Page.pdf]]:9: that plumes are not likely to impact the Teesmouth Estuary or the residents of the local area. [[this>Teesworks/Planning/R-2023-0291-ESM/R-2023-0291-ESM-ES Vol 1 Chapter 7 Air Quality.pdf|R-2023-0291-ESM-ES Vol 1 Chapter 7 Air Quality.pdf]]:11: flow, creating zones of increased turbulence. Increased turbulence causes the plume to come to ground [[this>Teesworks/Planning/R-2023-0291-ESM/R-2023-0291-ESM-ES Vol 1 Chapter 7 Air Quality.pdf|R-2023-0291-ESM-ES Vol 1 Chapter 7 Air Quality.pdf]]:11: turbulence and reducing the distance between the plume centre line and the ground level. A terrain [[this>Teesworks/Planning/R-2022-0096-CD/R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA - Detailed Quantitative Risk Assessment - South Bank.pdf|R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA - Detailed Quantitative Risk Assessment - South Bank.pdf]]:21:plume located north towards the River Tees from the SBA_AUK_BH110 area is present. The NAPL was found [[this>Teesworks/Planning/R-2022-0096-CD/R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA - Detailed Quantitative Risk Assessment - South Bank.pdf|R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA - Detailed Quantitative Risk Assessment - South Bank.pdf]]:28:groundwater plume originating from a localised source. Further higher concentrations were measured in the [[this>Teesworks/Planning/R-2022-0096-CD/R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA - Detailed Quantitative Risk Assessment - South Bank.pdf|R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA - Detailed Quantitative Risk Assessment - South Bank.pdf]]:29:In groundwater, a more distinct plume is evident in the vicinity of the SBCO area and southern SBA boundary, [[this>Teesworks/Planning/R-2022-0096-CD/R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA - Detailed Quantitative Risk Assessment - South Bank.pdf|R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA - Detailed Quantitative Risk Assessment - South Bank.pdf]]:40:Although the distribution of free and total cyanide does not form such an apparent plume-like distribution in [[this>Teesworks/Planning/R-2022-0096-CD/R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA - Detailed Quantitative Risk Assessment - South Bank.pdf|R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA - Detailed Quantitative Risk Assessment - South Bank.pdf]]:41:area and maybe associated with the plume. [[this>Teesworks/Planning/R-2022-0096-CD/R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA.pdf|R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA.pdf]]:21:plume located north towards the River Tees from the SBA_AUK_BH110 area is present. The NAPL was found [[this>Teesworks/Planning/R-2022-0096-CD/R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA.pdf|R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA.pdf]]:28:groundwater plume originating from a localised source. Further higher concentrations were measured in the [[this>Teesworks/Planning/R-2022-0096-CD/R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA.pdf|R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA.pdf]]:29:In groundwater, a more distinct plume is evident in the vicinity of the SBCO area and southern SBA boundary, [[this>Teesworks/Planning/R-2022-0096-CD/R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA.pdf|R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA.pdf]]:40:Although the distribution of free and total cyanide does not form such an apparent plume-like distribution in [[this>Teesworks/Planning/R-2022-0096-CD/R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA.pdf|R-2022-0096-CD-10035117-AUK-XX-XX-RP-ZZ-0331-02-SB_DQRA.pdf]]:41:area and maybe associated with the plume. [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf]]:17:site. While the DNAPL has not been measured downstream, a dissolved phase plume located north towards [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf]]:21:In groundwater, a more distinct plume is evident and does not appear to be associated with concentrations in [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf]]:76:Plume thickness 1.20 [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf]]:84: Initial contaminant concentration in groundwater at plume core C0 1.00E+00 mg/l 0 10 20 30 40 50 60 15.0 6.19E-01 [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf]]:84: Width of plume in aquifer at source (perpendicular to flow) Sz 1.90E+02 m 22.5 4.87E-01 [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf]]:84: Plume thickness at source Sy 1.20E+00 m Dispersivity based on Xu0& EcksteinNote graph assumes plume disperses vertically in one direction only. An alternative [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0270-01-SBA_DQRA.pdf]]:84: length the centre of the plume is located at the mid-depth of the aquifer is 27.5 4.15E-01 [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0331-01-SB_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0331-01-SB_DQRA.pdf]]:21:plume located north towards the River Tees from the SBA_AUK_BH110 area is present. The NAPL was found [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0331-01-SB_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0331-01-SB_DQRA.pdf]]:28:groundwater plume originating from a localised source. Further higher concentrations were measured in the [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0331-01-SB_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0331-01-SB_DQRA.pdf]]:29:In groundwater, a more distinct plume is evident in the vicinity of the SBCO area and southern SBA boundary, [[this>Teesworks/Planning/R-2021-0713-CD/R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0331-01-SB_DQRA.pdf|R-2021-0713-CD-10035117-AUK-XX-XX-RP-ZZ-0331-01-SB_DQRA.pdf]]:38:area and maybe associated with the plume. [[this>Teesworks/Planning/MLA_2020_00507/Consultations/338486 - 338489, NE formal response to SBW MLA, 29.01.21.pdf|338486 - 338489, NE formal response to SBW MLA, 29.01.21.pdf]]:4: To restrict suspended sediment plumes to one side of the estuary at a time, and [[this>Teesworks/Planning/MLA_2020_00507/Consultations/338486 - 338489, NE formal response to SBW MLA, 29.01.21.pdf|338486 - 338489, NE formal response to SBW MLA, 29.01.21.pdf]]:6: To restrict suspended sediment plumes to one side of the estuary at a time, in [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210119 MLA202000507 Tees South Bank Quay CP advice + JPQC.pdf|20210119 MLA202000507 Tees South Bank Quay CP advice + JPQC.pdf]]:4: Again, concern is largely focused on the water quality issue of the sediment plume, which is [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210119 MLA202000507 Tees South Bank Quay CP advice + JPQC.pdf|20210119 MLA202000507 Tees South Bank Quay CP advice + JPQC.pdf]]:4: assessed as minor also, including the remobilisation of chemicals within the SSC plumes due [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:2: I. Revised modelling of the plume that takes into account other dredging activity which may [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:5: be dredged from the Tees, resulting in sediment plumes. The effects of the plumes have been [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:5: on the sediment plume model presented, the applicant concluded that peak concentrations from [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:5: dredging will be localised, with the lateral extent of the plume across the river channel predicted to [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:5: plume effects arising from dredging will be observed throughout the whole dredging continuous [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:5: low SSC from 0 to 8.5 mg/l. Modelling of the sediment plume during capital dredging indicates that [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:5: activities be undertaken simultaneously, the sediment plumes, could result in additive effect which [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:5: impact as far as possible. However, it is stated that ‘the additive effect of the sediment plumes from [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:6: a time in order to reduce the extent and impact of the sediment plume. However, in my opinion, [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:7: width of the river. This is to reduce both the extent and impact of the dredged plume, as [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:7: any plume generated by operations is predicted to remain on the same side of the river as [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf|20210115 MLA202000507 South Bank Quay-phase 2 - Fisheries advice MG GE + JPQC.pdf]]:7: suspended sediment concentrations and the extent of the plume across the river channel will be [[this>Teesworks/Planning/MLA_2020_00507/Consultations/MLA-2020-00507.pdf|MLA-2020-00507.pdf]]:1: plume will not travel far enough to cause any issues either. Impacts at the disposal site [[this>Teesworks/Planning/MLA_2020_00507/Consultations/MLA-2020-00507.pdf|MLA-2020-00507.pdf]]:1: this is unlikely to be impacted by the works as the sediment plume is unlikely to travel that [[this>Teesworks/Planning/MLA_2020_00507/Consultations/20210201 MLA202000506 MLA202000507 Tees South Bank Phases 1 and 2 - EIA Licence Advice Minute - SEAL Advice v2+SJB.pdf|20210201 MLA202000506 MLA202000507 Tees South Bank Phases 1 and 2 - EIA Licence Advice Minute - SEAL Advice v2+SJB.pdf]]:5: and would likely require sediment and plume dispersal modelling as part of a cumulative [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:The capital dredging of the river and the offshore disposal of dredged sediments both will cause plumes of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:sediment to form. The plume effects arising from the river dredging are characterised by a short-lived [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:following hours. Since the dredging is a near-continuous operation, the plume effects will be observed [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected from the offshore [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:11:magnitude over a few hours after disposal. Deposition thicknesses of sediment from the plumes on the river [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:12:exceeding water quality standards was deemed to be low. Additionally, sediment plume modelling shows [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:12:resuspension of sediments. Such measures include dredging in long strips to ensure the plume is located [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:13:scheme footprint and the results of the hydrodynamic and sediment plume modelling, an impact of minor [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS-5.pdf]]:20:Based on the findings of hydrodynamic and sedimentary plume modelling, the disposal of dredged material [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:8:5 Hydrodynamic and sedimentary plume modelling report [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:55: Environmental Statement. modelling and modelling of sediment plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:57: Environmental Statement. 2014 modelling and modelling of sediment plume released from [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:60: • Sediment plume modelling: The updated and verified 3D Tees Estuary Tidal Model was used to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:60: coupling with a sediment plume model built in MIKE21-MT software. The sediment plume model [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:91:offshore site will both result in sediment plumes. These effects have been investigated using numerical [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:91:changes in bed thickness when the suspended sediment falls from the plume to become deposited on the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:92: represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:92: become affected by a plume at some point during the dredging or disposal activities (in some areas [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:92:or river channel). To illustrate this, Figures 6.32 – 6.35 shows the maximum extent of the plume during a [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:92:When the dredger is at the south-western end of the transect, the maximum spatial extent of the plume on [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:92:Middlesbrough Dock. When the dredger is at the north-eastern end of the transect, the extent of the plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:92:new quay. However, in all cases considered, the lateral extent of the plume across the river channel is very [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:92:narrow and the magnitude of the SSC within the plume beyond a few hundred metres from the point of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:92:release is of the order of 10 to 20mg/l and in the extremities of the plume reduces further to the same order [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:93:Figure 6.32 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:94:Figure 6.33 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:95:Figure 6.34 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:96:Figure 6.35 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:97:Results from this scenario are broadly similar to those from Stage 1, but now separate plumes are created [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:97:plumes can coalesce and collectively occupy around half the width of the river channel as they move [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:98:Figure 6.37 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:99:Figure 6.38 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:99:plume (at low concentrations) becomes slightly greater; (ii) the extent of the plume across the river channel [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:99:becomes wider; and (iii) at times two plumes are created by the in-parallel dredging activities. Despite these [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:100:Figures 6.40 – 6.43 shows the maximum extent of the plume during a release from the south-western corner [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:100:and the spatial extents of the plume arising from Stage 3 of the dredging are much lower than those [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:101:Figure 6.40 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:102:Figure 6.41 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:103:Figure 6.42 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:104:Figure 6.43 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:104:the maximum plume extent and maximum SSC values within the plume are much lower than experienced [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:104:during both Stages 1 and 2 of the dredging (note the slight plume shown in the mid channel is a remnant of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:104:maximum extent of the plume is confined to within the length of the proposed quay and covers only a very [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:105:phase of the tide). Figure 6.45 and 6.46 shows the maximum extent of the plume during a release from the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:105:On the ebb phase, the plume can extend at low (<30mg/l) concentrations along the jetties of the Oil Terminal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:105:Depot. Under no conditions does the plume enter Tees Dock at any significant concentration. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:106:Figure 6.45 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:107:Figure 6.46 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:107:the plume is created at the turning circle and along parts of the north bank of the river. As with previous [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:108:The sediment plumes that arise from the four stages of the dredging could potentially affect areas of riverbed [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:108:that during the predicted four months of dredging, all individual or coalesced plume effects are confined to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:108:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:108:whilst all plumes associated with dredging of the turning circle are confined to the left bank (north of centre [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:109:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:110:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:110:zone of influence from the sediment plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:111:Within this maximum zone of influence from sediment plumes and bed deposition, the following receptors [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:112:elevations in SSC drop rapidly after each dredging plume has dispersed, and return to baseline levels at [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:the 10-minute duration of disposal activity; and (iii) at selected intervals thereafter until the initial plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. It can then [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:This plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:At 30 minutes after cessation of discharge (Plot F), the plume is less than 250mg/l at its localised centre, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:phase of the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:activity commences and starts to form its own sediment plume (Plot H), the initial plume has moved [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:sufficiently far from its point of release that it does not coalesce with the new plume and, by this time, is less [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:not visible in the plots at the magnitudes presented. The original plume continues to disperse such that [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:although when the discharge is made during the flooding tide, the plume moves in a south-easterly direction, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:along the axis of principal tidal flows. At times when the release is around slack water, the plume tends to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:118:west or south-east, respectively). However, when this occurs the concentration in the plume reduces readily [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:119:Figure 6.60 Plume of enhanced SSCs arising from disposal activities during Stage 1 of the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:from the BHD (although the time intervals are greater), the initial plume has greater SSC values at its centre, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:case for maximum SSC), the plume resides in spatial extent around the point of release during the slack [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:plume has started to move towards the south-east through advection by the flood tidal currents, and the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:release point (Plot F). At this point in time, the TSHD plume has further reduced in peak concentration to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:around 200mg/l. Some 30 minutes later, the TSHD plume and subsequent BHD plume have fully coalesced, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:with two peaks in concentration; the original TSHD plume has a peak now around 100mg/l locally at its [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:centre whilst the more recently formed (but smaller) BHD plume has a peak SSC value at its centre of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:previous TSHD release, the now fully coalesced plume has a peak SSC of around 100mg/l very locally and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:plume remains present a further 45 minutes later, the original coalesced plume is considerably smaller in [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:successive disposal events, any coalescence of subsequent plumes would continue to result in only [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:120:coalescence of successive plumes at significant concentrations or for long durations is very low even during [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:121:Figure 6.61 Plume of enhanced SSCs arising from disposal activities during Stage 2 of the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:122:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. The [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:122:plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:122:The plumes associated with Stage 3 disposal activities are generally lower in concentration than those for [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:122:Indeed, the plume arising from Stage 3 disposal activities fully disperses before the next subsequent [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:122:in this offshore area). Due to this, there is no possibility of plumes coalescing from Stage 3 disposal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:123:Figure 6.4 Plume of enhanced SSCs arising from disposal activities during Stage 3 of the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:124:Like during Stage 2, there is potential for the plume from a TSHD discharge to coalesce with a preceding or [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:124:Plot A shows the residual plume from a TSHD disposal some 5 minutes before the commencement of a [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:124:separate plumes at 45 minutes after cessation of the BHD discharge. A further 30 minutes later, another [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:124:TSHD release occurs within the previous BHD plume extent (Plot E). Peak concentrations from the TSHD [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:124:plume has widely dispersed, a further BHD release is made some 50 minutes later, again within the previous [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:124:(now coalesced) plumes. Despite this coalesced plume now containing elements of three separate [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:124:the residual plume shown in Plot A coalesce with the ‘three-release’ plume (Plot G), although the SSC [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:124:values at the point of overlap are very low (~10mg/l). Around 55 minutes later, the plume is now mostly [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:124:disposal site, leading to coalescence of subsequent plumes, the resulting temporary, short duration effects [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:125:Figure 6.5 Plume of enhanced SSCs arising from disposal activities during Stage 4 of the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:126:for coalescence of subsequent plumes is greatest. In reality, subsequent disposals will be at different parts [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:126:At the extremities of the plume extent, there are wide zones of relatively low SSC values (<100mg/l). [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:126:sediment plume associated with one release event (this example being from Stage 1). It can be seen that [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:126:is negligible, whilst to the north it covers a similar zone to the sediment plume for this disposal event, which [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:130:the northern and southern boundaries (Figure 6.68). This correlates to the areas where a plume will extend [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:131:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:131:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:131:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:131:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:131:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:131:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:132:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:132:plume effects will be observed throughout much of the approximately four-month period, but at varying [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:132:extents during the four different stages. During Stages 1-3 the dredging-related plume effects will be largely [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:132:Dock and Tees Dock. During Stage 4 the dredging-related plume effects will be largely confined to the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:132:very minor magnitudes, in areas covering the same spatial extent as the sediment plumes. Where this [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:132:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:132:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:143: the findings of hydrodynamic and sedimentary plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:143: sediment and create smothering effects / turbidity / sediment plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:144:are predicted to occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:157:Capital dredging would result in the creation of sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:157:In all tidal conditions modelled, the lateral extent of the plume across the river channel is very narrow and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:157:the magnitude of concentrations within the plume beyond a few hundred metres from the point of release is [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:157:in the order of 10 - 20mg/l and in the extremities of the plume, reduces further to concentrations 0-10mg/l [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:157:Results for this stage were similar to those in Stage 1 but with separate plumes created by the different [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:157:dredgers. At some points in the cycle, areas of these initially separate plumes combine as they move [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:157:The maximum concentrations and the spatial extents of the plume arising from Stage 3 of the dredging are [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:157:and the production rate of dredging is notably lower. Figure 7.5 shows an example plume during Stage 3 [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:157:Again, peak concentrations close to the dredger are shown in the plume modelling output. On the ebb [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:157:phase, the plume can extend at low concentrations (<30mg/l) along the jetties of the Oil Terminal towards [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:158:Figure 7. 3 Plume of suspended sediment concentrations arising from dredging activities during Stage 2 [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:159:Figure 7. 4 Plume arising from dredging activities during Stage 1 of the capital dredge (release from the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:160:Figure 7. 5 Plume of suspended sediment concentrations arising from dredging activities during Stage [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:161:Figure 7.6 Plume of enhanced suspended sediment concentrations arising from dredging activities [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:162:sediment plume is not predicted to reach The Gares water quality monitoring point, no effects on the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:162:The relatively limited nature of the plume extents predicted for the proposed capital dredging indicates that [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:166:Additionally, information from sediment plume modelling (see Section 7.5.1) indicates that only the Smiths [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:194:hydrodynamic and sedimentary plume modelling undertaken. This section excludes consideration of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:210:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:210:dredging periods. The sediment plume generated by dredging would likely be dispersed by tidal currents [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:211:immediate vicinity of the dredger. Sediment plume modelling predicts different plume extents and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:211:cases, the sediment plume is predicted to be very narrow within the river, with the phase of dredging with [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:211:extremities of the plume. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:211:All plumes associated with different stages of dredging in the vicinity of the proposed new quay are confined [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:211:to the southern bank of the river, whilst all plumes associated with dredging of the turning circle are confined [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:211:to the northern bank. No plume effects of a significant level above background values are anticipated to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:211:The sediment plume modelling reported within Section 6 also extracted time series plots of changes in SSC [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:212:from the sediment plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:212:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:256: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:257: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:296:In summary, the largest sediment plumes are likely to arise during Stage 2 of the dredging (i.e. BHD and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:296:(it is not a sediment plume, rather a combined zone of influence). The sediment dispersion modelling of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:296:distance from the dredging vessel, both laterally and along the line of the vessel, with plumes diminishing [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:296:of this assessment, the sediment plume may be regarded as representing a temporary loss of foraging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:297:terns do not forage to any significant extent within the predicted range of the sediment plume. Likewise, the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:297:England, 2018a), and the area likely to be affected by the sediment plume at any one time represents around [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:297:available even if the plume does result in temporary occlusion from the affected area. Furthermore, SSC [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:298:and the other stages of the dredge campaign would result in a smaller plume than that described for Stage [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:298: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:298: plume generated by operations is predicted to collectively occupy around half the width of the river [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:298:With the implementation of the above mitigation measure, the modelled plume would only occupy half of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:309:informed by the hydrodynamic and sedimentary plume modelling undertaken, as well as the understanding [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:318:details of the increase in SSC, including the visual output of sediment plume modelling for the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:319:sediment plume creating a ‘barrier’ effect could cause a significant disruption to the annual migration pattern, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:319:during a period of very hot and dry weather. Modelling of the sediment plume during capital dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:320:vessel, both laterally and along the line of the vessel. The periphery of the plume (10 to 20 mg/l) extends [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:320:The cross section of the river channel affected by the plume is particularly relevant when considering [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:320:narrow plume along the axis of the river. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:320:period. However, while unlikely, it has to be taken into account that sediment plumes encompassing the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:320: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:320: plume generated by operations is predicted to remain on the same side of the river as the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:320:Mitigation of the plume effects by reducing the size of the TSHD, and thus reducing the rate of overflow, is [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:424:well as hydrodynamic and sedimentary plume modelling reported in Section 6. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:478:As the offshore disposal commences, a plume of sediment would be generated with the greatest [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:478:concentrations predicted at the end of the discharge period. The sediment plume is predicted to increase [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:478:At 30 minutes after cessation of discharge, the plume is less than 250mg/l at its localised centre, reducing [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:478:the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of less than [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:478:commences and starts to form its own sediment plume, the initial plume has moved sufficiently far from its [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:478:point of release that it does not coalesce with the new plume and, by this time, is less than 40mg/l in SSC [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:478:at the magnitudes presented. The original plume continues to disperse such that after 4 hours and 25 [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:478:At times when the release is around slack water, the plume tends to reside closer to the point of release for [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:478:However, when this occurs the concentration in the plume reduces readily because more material falls to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:479:Based on the modelled effects of the sediment plume at the Tees Bay C disposal site described above, it is [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:490: influencing the same area as affected by the sediment plume); and, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:491:the basis of the potential extent of the dredging and disposal plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:500:All projects scoped into the CIA involve will involve capital dredging. This activity will create a plume of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:500:The extent of the sediment plume created by capital dredging is heavily dependent on the dredging plant [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:501:important to note that figures showing the “maximum extent of sediment plume dispersion and deposition” [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:501:do not represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:501:affected by a plume at some point during the dredging or disposal activities (in some areas this will be on a [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:501:Consequently, for the purposes of this CIA, the maximum zones of influence of sediment plume dispersion [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:501:of sediment plume dispersion and deposition onto the river and/or seabed during capital dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:501:sediment in the water column was predicted to be in close proximity to the dredger, with plume dispersion [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:501:resulting in a significantly reduced concentration of suspended sediment beyond the source of the plume. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:501:material will be re-dredged as part of the capital works for each scheme. At the peripheries of each plume, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:502:(right) as a result of the proposed scheme [Note: plots show sediment plume impacts arising from dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:506:addition, the predictions made for each project represent sediment plume dispersion under specific tidal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:506:where sediment plumes combine at peak concentration (as predicted by the EIA studies for each project) [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:506:at any location. Additionally, mitigation is outlined for all three schemes which would reduce plume extents [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:506:proposed scheme, it is considered unlikely that the plumes would overlap. As a result, there may be a [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:506:additional mitigation measures are identified to reduce any resulting sediment plume as far as possible and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:507:plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:507:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:513:plumes occupy only half of the river cross section) has also been proposed for the NGCT project. For the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:513:England, 2018a), the area affected even by the combined plumes is likely to be low (for example, should [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:513:dredging plumes together will still affect only around 0.5% of the SPA subtidal habitat (Royal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:513:HaskoningDHV, 2015)). However, the additive effect of the sediment plumes from separate dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:514:sediment plumes may deter such species from migrating to and from spawning sites. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:514:the respective sediment plumes could result in an additive effect, as demonstrated in Figures 27.1 to 27.3. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:514:Significantly, the effect of a combined plume is not likely to result in a different behavioural response in fish [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:514:compared with the effect of the projects in isolation, although the increased plume footprint may increase [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:514:of the sediment plumes from separate dredging campaigns cannot be completely avoided if the campaigns [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:522:WFD water body (approximately 6.3km, see Figure 28.1) and plume modelling results described in Section [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:528: measures identified for the Tees estuary. habitats located within sediment plumes created [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:532:Capital dredging within the river would result in sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:532: BHD working to dredge the In all tidal conditions modelled, the lateral extent of the plume across the river channel [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:532: upper soft material in the is very narrow and the magnitude of concentrations within the plume beyond a few [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:532: channel. extremities of the plume, reduces further to concentrations 0-10mg/l. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:532: 2 Results for this stage were similar to those in Stage 1 but with separate plumes [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:532: separate plumes combine as they move upstream and downstream according to the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:532: 3 BHD working to dredge the The maximum concentrations and the spatial extents of the plume arising from Stage [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:532: channel. notably lower. Plume very small and located close to the dredging activity. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:532: 4 Again, peak concentrations close to the dredger are shown in the plume modelling [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:532: output. On the ebb phase, the plume can extend at low concentrations (<30mg/l) [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:534:represent a more conservative scenario, as sediment plume modelling outlined above indicates relatively [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:534:limited plume extents for the majority of the capital dredge for the proposed scheme. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:535:Additionally, sediment plume results for Smiths Dock monitoring point (point 3) indicated only temporary [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:535:be temporary which would disperse following cessation of the works. Plume extents during each of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:537:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:538:zone of influence from the sediment plumes. As a result, a deterioration in ecological class status is not [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:539:peak migratory season, when a sediment plume creating a ‘barrier’ effect could cause a significant disruption [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:539:extent and impact of the plume. This allows a passage through which migratory fish will be able to move [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:539: dredging along the axis of the river to ensure the plumes are [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:544: • Cumulative effects of sediment plumes and associated effects on water quality and fish [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:545:Section 27 considers the potential cumulative effects of the proposed schemes on sediment plumes and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:545:marine water quality. To summarise, whilst the sediment plumes could combine to cover a larger area of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:545:plumes spreading across the width of the channel. Additionally, due to navigational safety, it is unlikely that [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:549:strips thus limiting the plume extent. As a result, non- temporary effects on water quality and associated [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:550:would be sediment plumes associated with dredging simultaneously. However, on further consideration, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:559:proposed scheme nor the modelled extent of the maximum-expected sediment plume from the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:559:influence of the proposed scheme will be determined by the sediment plume during dredging activities. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:572:The capital dredging of the river will cause plumes of sediment to form. The plume effects arising from the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:572:operation, the plume effects will be observed throughout much of the approximately five-month period, but [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:572:of sediment from the plumes on the river or seabed will be very small. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:575:requires use of TSHD and BHD on soft sediment in the channel and berth pocket) will result in plumes of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:575:with plumes diminishing typically to levels of <30 mg/l but often <10mg/l at a distance of no more than a few [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:575:England, 2018a). The area affected by the sediment plume generated from proposed dredging, though [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:580:In terms of intra-project effects on foraging common terns, the zone of influence from the sediment plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:580:of the area would not be increased since the plume is considered to be the most far-reaching effect on tern [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:583:Effects on fish may be compounded by the combined sediment plumes of other projects or plans that may [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:584:An interaction between the sediment plumes would only occur in the unlikely event that the capital dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:584:Plumes from each project would be temporary and short-lived. The same applies for the Anglo American [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:584:combined plumes is expected to be minor. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:584:sediment plumes occupy only half of the river cross section) has also been proposed for the NGCT project. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:586:The zone of influence from predicted sediment plumes (including the combined plumes from the proposed [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-9.pdf]]:593:sediment plumes arising from dredging. Construction Industry Research and Information Association [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:61:from the proposed dredging and disposal activity by coupling a sediment plume model built in MIKE21-MT [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:63:hydrodynamic and sedimentary regime assessment (particularly the plume dispersion modelling to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:65:sediment plume modelling will, however, be used to inform impacts to water quality as a result of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:130:plume modelling report [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:131:Hydro-dynamic and sedimentary plume modelling [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:139: a sediment plume model built in MIKE3-MT software. The sediment plume model was run for the entire [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:193:plume dispersion model are described in this section. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:197:The following assumptions have been made for the simulation of sediment plumes arising from dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:200: to note that this type of figure does not represent a plume or deposition that would occur at any one [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:200: point in time (such plumes or deposition are shown in the animated timestep plots). Rather, this [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:200: affected by a plume or deposition at some point during the 4-months of dredging or disposal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:202:although: (i) the lateral extent of the plume (at low concentrations) becomes slightly greater; (ii) the extent [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:202:of the plume across the river channel becomes wider; and (iii) at times two plumes are created by the in- [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:203:that during Stage 3 of the dredging, the maximum plume extent and maximum SSC values within the plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:203:are much lower than experienced during both Stage 1 and 2 of the dredging (note the slight plume shown [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:203:commences). During Stage 3, the maximum extent of the plume is confined to within the length of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:204:that during Stage 4 of the dredging, the plume is created at the turning circle and along parts of the north [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:205:and that during the 4 months of dredging, all plume effects are confined to within the river reaches that [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:205:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:205:plumes associated with dredging of the turning circle are confined to the left bank (north of centre line) [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:205:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:207:the plumes created by river dredging. It can be seen that much of the sediment falls to the bed within the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:207:that is affected by the zone of influence from the sediment plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:208:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:208:single release point and the potential for coalescence of subsequent depositional plumes is greatest. In [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:208:a few km of the upstream and downstream boundaries. At the extremities of the plume extent, there are [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:208:sediment plume for this worst case. It can be seen that much of the sediment falls to the bed within the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:208:similar zone to the sediment plume. In reality, disposals will be at different points within the licensed area, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:210:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:210:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:210:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:plume effects will be observed throughout much the 4-month period, but at varying extents during the four [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:different stages. During Stages 1-3 the dredging-related plume effects will be largely confined to the channel [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:During Stage 4 the dredging-related plume effects will be largely confined to the channel areas north of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:areas covering the same spatial extent as the sediment plumes. Where this occurs in the river channel or [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part1-3.pdf]]:211:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:2:that the most important potential coastal process impact would be changes in suspended sediment plumes, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:2:suspended sediment plumes; that being each disposal within the licensed disposal site being released at [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:2:plumes from separate disposal activities over the whole dredging campaign. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:2:licensed disposal site is a worst case for potential plume coalescence it is not realistic in terms of changes [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:2:bed thickness caused by deposition of material from the sediment plume associated with one single release [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:4:(Figure 6.67). This correlates to the areas where a plume will extend along the axis of the prevailing tidal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:15: • Revised modelling of the plume that takes into account other dredging activity which may be [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:15:each project are presented and discussed. It is not practicable to undertake a combined sediment plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:15:addition, the predictions made for each project represent sediment plume dispersion under specific tidal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:16:scenario where sediment plumes combine at peak concentration (as predicted by the EIA studies for each [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:16:project) at any location. Additionally, mitigation is outlined for all three schemes which would reduce plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:16:We would also like to reiterate that the sediment plumes shown in Section 6 of the EIA Report are maximum [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:16:not represent a plume that would occur at any one point of time. Rather, the figures show the areas of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf|MLA_2020_00507-PC1084-RHD-SB-EN-CO-EV-1116 Response to Cefas comments-10.pdf]]:16:river channel that will become affected by a plume at some point during the dredging campaign (in some [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:8:5 Hydrodynamic and sedimentary plume modelling report [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:55: Environmental Statement. modelling and modelling of sediment plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:57: Environmental Statement. 2014 modelling and modelling of sediment plume released from [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:60: • Sediment plume modelling: The updated and verified 3D Tees Estuary Tidal Model was used to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:60: coupling with a sediment plume model built in MIKE21-MT software. The sediment plume model [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:91:offshore site will both result in sediment plumes. These effects have been investigated using numerical [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:91:changes in bed thickness when the suspended sediment falls from the plume to become deposited on the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92: represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92: become affected by a plume at some point during the dredging or disposal activities (in some areas [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:or river channel). To illustrate this, Figures 6.32 – 6.35 shows the maximum extent of the plume during a [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:When the dredger is at the south-western end of the transect, the maximum spatial extent of the plume on [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:Middlesbrough Dock. When the dredger is at the north-eastern end of the transect, the extent of the plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:new quay. However, in all cases considered, the lateral extent of the plume across the river channel is very [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:narrow and the magnitude of the SSC within the plume beyond a few hundred metres from the point of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:92:release is of the order of 10 to 20mg/l and in the extremities of the plume reduces further to the same order [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:93:Figure 6.32 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:94:Figure 6.33 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:95:Figure 6.34 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:96:Figure 6.35 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:97:Results from this scenario are broadly similar to those from Stage 1, but now separate plumes are created [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:97:plumes can coalesce and collectively occupy around half the width of the river channel as they move [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:98:Figure 6.37 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:99:Figure 6.38 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:99:plume (at low concentrations) becomes slightly greater; (ii) the extent of the plume across the river channel [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:99:becomes wider; and (iii) at times two plumes are created by the in-parallel dredging activities. Despite these [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:100:Figures 6.40 – 6.43 shows the maximum extent of the plume during a release from the south-western corner [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:100:and the spatial extents of the plume arising from Stage 3 of the dredging are much lower than those [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:101:Figure 6.40 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:102:Figure 6.41 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:103:Figure 6.42 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:104:Figure 6.43 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:104:the maximum plume extent and maximum SSC values within the plume are much lower than experienced [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:104:during both Stages 1 and 2 of the dredging (note the slight plume shown in the mid channel is a remnant of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:104:maximum extent of the plume is confined to within the length of the proposed quay and covers only a very [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:105:phase of the tide). Figure 6.45 and 6.46 shows the maximum extent of the plume during a release from the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:105:On the ebb phase, the plume can extend at low (<30mg/l) concentrations along the jetties of the Oil Terminal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:105:Depot. Under no conditions does the plume enter Tees Dock at any significant concentration. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:106:Figure 6.45 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:107:Figure 6.46 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:107:the plume is created at the turning circle and along parts of the north bank of the river. As with previous [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:108:The sediment plumes that arise from the four stages of the dredging could potentially affect areas of riverbed [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:108:that during the predicted four months of dredging, all individual or coalesced plume effects are confined to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:108:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:108:whilst all plumes associated with dredging of the turning circle are confined to the left bank (north of centre [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:109:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:110:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:110:zone of influence from the sediment plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:111:Within this maximum zone of influence from sediment plumes and bed deposition, the following receptors [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:112:elevations in SSC drop rapidly after each dredging plume has dispersed, and return to baseline levels at [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:the 10-minute duration of disposal activity; and (iii) at selected intervals thereafter until the initial plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. It can then [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:This plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:At 30 minutes after cessation of discharge (Plot F), the plume is less than 250mg/l at its localised centre, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:phase of the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:activity commences and starts to form its own sediment plume (Plot H), the initial plume has moved [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:sufficiently far from its point of release that it does not coalesce with the new plume and, by this time, is less [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:not visible in the plots at the magnitudes presented. The original plume continues to disperse such that [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:although when the discharge is made during the flooding tide, the plume moves in a south-easterly direction, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:along the axis of principal tidal flows. At times when the release is around slack water, the plume tends to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:118:west or south-east, respectively). However, when this occurs the concentration in the plume reduces readily [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:119:Figure 6.60 Plume of enhanced SSCs arising from disposal activities during Stage 1 of the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:from the BHD (although the time intervals are greater), the initial plume has greater SSC values at its centre, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:case for maximum SSC), the plume resides in spatial extent around the point of release during the slack [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:plume has started to move towards the south-east through advection by the flood tidal currents, and the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:release point (Plot F). At this point in time, the TSHD plume has further reduced in peak concentration to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:around 200mg/l. Some 30 minutes later, the TSHD plume and subsequent BHD plume have fully coalesced, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:with two peaks in concentration; the original TSHD plume has a peak now around 100mg/l locally at its [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:centre whilst the more recently formed (but smaller) BHD plume has a peak SSC value at its centre of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:previous TSHD release, the now fully coalesced plume has a peak SSC of around 100mg/l very locally and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:plume remains present a further 45 minutes later, the original coalesced plume is considerably smaller in [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:successive disposal events, any coalescence of subsequent plumes would continue to result in only [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:120:coalescence of successive plumes at significant concentrations or for long durations is very low even during [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:121:Figure 6.61 Plume of enhanced SSCs arising from disposal activities during Stage 2 of the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:122:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. The [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:122:plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:122:The plumes associated with Stage 3 disposal activities are generally lower in concentration than those for [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:122:Indeed, the plume arising from Stage 3 disposal activities fully disperses before the next subsequent [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:122:in this offshore area). Due to this, there is no possibility of plumes coalescing from Stage 3 disposal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:123:Figure 6.4 Plume of enhanced SSCs arising from disposal activities during Stage 3 of the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:Like during Stage 2, there is potential for the plume from a TSHD discharge to coalesce with a preceding or [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:Plot A shows the residual plume from a TSHD disposal some 5 minutes before the commencement of a [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:separate plumes at 45 minutes after cessation of the BHD discharge. A further 30 minutes later, another [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:TSHD release occurs within the previous BHD plume extent (Plot E). Peak concentrations from the TSHD [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:plume has widely dispersed, a further BHD release is made some 50 minutes later, again within the previous [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:(now coalesced) plumes. Despite this coalesced plume now containing elements of three separate [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:the residual plume shown in Plot A coalesce with the ‘three-release’ plume (Plot G), although the SSC [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:values at the point of overlap are very low (~10mg/l). Around 55 minutes later, the plume is now mostly [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:124:disposal site, leading to coalescence of subsequent plumes, the resulting temporary, short duration effects [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:125:Figure 6.5 Plume of enhanced SSCs arising from disposal activities during Stage 4 of the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:126:for coalescence of subsequent plumes is greatest. In reality, subsequent disposals will be at different parts [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:126:At the extremities of the plume extent, there are wide zones of relatively low SSC values (<100mg/l). [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:126:sediment plume associated with one release event (this example being from Stage 1). It can be seen that [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:126:is negligible, whilst to the north it covers a similar zone to the sediment plume for this disposal event, which [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:130:the northern and southern boundaries (Figure 6.68). This correlates to the areas where a plume will extend [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:131:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:plume effects will be observed throughout much of the approximately four-month period, but at varying [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:extents during the four different stages. During Stages 1-3 the dredging-related plume effects will be largely [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:Dock and Tees Dock. During Stage 4 the dredging-related plume effects will be largely confined to the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:very minor magnitudes, in areas covering the same spatial extent as the sediment plumes. Where this [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:132:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:143: the findings of hydrodynamic and sedimentary plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:143: sediment and create smothering effects / turbidity / sediment plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:144:are predicted to occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:Capital dredging would result in the creation of sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:In all tidal conditions modelled, the lateral extent of the plume across the river channel is very narrow and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:the magnitude of concentrations within the plume beyond a few hundred metres from the point of release is [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:in the order of 10 - 20mg/l and in the extremities of the plume, reduces further to concentrations 0-10mg/l [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:Results for this stage were similar to those in Stage 1 but with separate plumes created by the different [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:dredgers. At some points in the cycle, areas of these initially separate plumes combine as they move [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:The maximum concentrations and the spatial extents of the plume arising from Stage 3 of the dredging are [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:and the production rate of dredging is notably lower. Figure 7.5 shows an example plume during Stage 3 [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:Again, peak concentrations close to the dredger are shown in the plume modelling output. On the ebb [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:157:phase, the plume can extend at low concentrations (<30mg/l) along the jetties of the Oil Terminal towards [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:158:Figure 7. 3 Plume of suspended sediment concentrations arising from dredging activities during Stage 2 [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:159:Figure 7. 4 Plume arising from dredging activities during Stage 1 of the capital dredge (release from the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:160:Figure 7. 5 Plume of suspended sediment concentrations arising from dredging activities during Stage [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:161:Figure 7.6 Plume of enhanced suspended sediment concentrations arising from dredging activities [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:162:sediment plume is not predicted to reach The Gares water quality monitoring point, no effects on the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:162:The relatively limited nature of the plume extents predicted for the proposed capital dredging indicates that [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:166:Additionally, information from sediment plume modelling (see Section 7.5.1) indicates that only the Smiths [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:194:hydrodynamic and sedimentary plume modelling undertaken. This section excludes consideration of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:210:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:210:dredging periods. The sediment plume generated by dredging would likely be dispersed by tidal currents [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:immediate vicinity of the dredger. Sediment plume modelling predicts different plume extents and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:cases, the sediment plume is predicted to be very narrow within the river, with the phase of dredging with [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:extremities of the plume. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:All plumes associated with different stages of dredging in the vicinity of the proposed new quay are confined [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:to the southern bank of the river, whilst all plumes associated with dredging of the turning circle are confined [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:to the northern bank. No plume effects of a significant level above background values are anticipated to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:211:The sediment plume modelling reported within Section 6 also extracted time series plots of changes in SSC [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:212:from the sediment plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:212:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:256: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:257: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:296:In summary, the largest sediment plumes are likely to arise during Stage 2 of the dredging (i.e. BHD and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:296:(it is not a sediment plume, rather a combined zone of influence). The sediment dispersion modelling of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:296:distance from the dredging vessel, both laterally and along the line of the vessel, with plumes diminishing [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:296:of this assessment, the sediment plume may be regarded as representing a temporary loss of foraging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:297:terns do not forage to any significant extent within the predicted range of the sediment plume. Likewise, the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:297:England, 2018a), and the area likely to be affected by the sediment plume at any one time represents around [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:297:available even if the plume does result in temporary occlusion from the affected area. Furthermore, SSC [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:298:and the other stages of the dredge campaign would result in a smaller plume than that described for Stage [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:298: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:298: plume generated by operations is predicted to collectively occupy around half the width of the river [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:298:With the implementation of the above mitigation measure, the modelled plume would only occupy half of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:309:informed by the hydrodynamic and sedimentary plume modelling undertaken, as well as the understanding [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:318:details of the increase in SSC, including the visual output of sediment plume modelling for the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:319:sediment plume creating a ‘barrier’ effect could cause a significant disruption to the annual migration pattern, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:319:during a period of very hot and dry weather. Modelling of the sediment plume during capital dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320:vessel, both laterally and along the line of the vessel. The periphery of the plume (10 to 20 mg/l) extends [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320:The cross section of the river channel affected by the plume is particularly relevant when considering [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320:narrow plume along the axis of the river. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320:period. However, while unlikely, it has to be taken into account that sediment plumes encompassing the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320: plume generated by operations is predicted to remain on the same side of the river as the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:320:Mitigation of the plume effects by reducing the size of the TSHD, and thus reducing the rate of overflow, is [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:424:well as hydrodynamic and sedimentary plume modelling reported in Section 6. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:As the offshore disposal commences, a plume of sediment would be generated with the greatest [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:concentrations predicted at the end of the discharge period. The sediment plume is predicted to increase [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:At 30 minutes after cessation of discharge, the plume is less than 250mg/l at its localised centre, reducing [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of less than [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:commences and starts to form its own sediment plume, the initial plume has moved sufficiently far from its [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:point of release that it does not coalesce with the new plume and, by this time, is less than 40mg/l in SSC [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:at the magnitudes presented. The original plume continues to disperse such that after 4 hours and 25 [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:At times when the release is around slack water, the plume tends to reside closer to the point of release for [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:478:However, when this occurs the concentration in the plume reduces readily because more material falls to [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:479:Based on the modelled effects of the sediment plume at the Tees Bay C disposal site described above, it is [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:490: influencing the same area as affected by the sediment plume); and, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:491:the basis of the potential extent of the dredging and disposal plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:500:All projects scoped into the CIA involve will involve capital dredging. This activity will create a plume of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:500:The extent of the sediment plume created by capital dredging is heavily dependent on the dredging plant [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:important to note that figures showing the “maximum extent of sediment plume dispersion and deposition” [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:do not represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:affected by a plume at some point during the dredging or disposal activities (in some areas this will be on a [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:Consequently, for the purposes of this CIA, the maximum zones of influence of sediment plume dispersion [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:of sediment plume dispersion and deposition onto the river and/or seabed during capital dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:sediment in the water column was predicted to be in close proximity to the dredger, with plume dispersion [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:resulting in a significantly reduced concentration of suspended sediment beyond the source of the plume. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:501:material will be re-dredged as part of the capital works for each scheme. At the peripheries of each plume, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:502:(right) as a result of the proposed scheme [Note: plots show sediment plume impacts arising from dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:506:addition, the predictions made for each project represent sediment plume dispersion under specific tidal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:506:where sediment plumes combine at peak concentration (as predicted by the EIA studies for each project) [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:506:at any location. Additionally, mitigation is outlined for all three schemes which would reduce plume extents [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:506:proposed scheme, it is considered unlikely that the plumes would overlap. As a result, there may be a [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:506:additional mitigation measures are identified to reduce any resulting sediment plume as far as possible and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:507:plumes. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:507:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:513:plumes occupy only half of the river cross section) has also been proposed for the NGCT project. For the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:513:England, 2018a), the area affected even by the combined plumes is likely to be low (for example, should [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:513:dredging plumes together will still affect only around 0.5% of the SPA subtidal habitat (Royal [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:513:HaskoningDHV, 2015)). However, the additive effect of the sediment plumes from separate dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:514:sediment plumes may deter such species from migrating to and from spawning sites. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:514:the respective sediment plumes could result in an additive effect, as demonstrated in Figures 27.1 to 27.3. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:514:Significantly, the effect of a combined plume is not likely to result in a different behavioural response in fish [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:514:compared with the effect of the projects in isolation, although the increased plume footprint may increase [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:514:of the sediment plumes from separate dredging campaigns cannot be completely avoided if the campaigns [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:522:WFD water body (approximately 6.3km, see Figure 28.1) and plume modelling results described in Section [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:528: measures identified for the Tees estuary. habitats located within sediment plumes created [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532:Capital dredging within the river would result in sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: BHD working to dredge the In all tidal conditions modelled, the lateral extent of the plume across the river channel [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: upper soft material in the is very narrow and the magnitude of concentrations within the plume beyond a few [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: channel. extremities of the plume, reduces further to concentrations 0-10mg/l. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: 2 Results for this stage were similar to those in Stage 1 but with separate plumes [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: separate plumes combine as they move upstream and downstream according to the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: 3 BHD working to dredge the The maximum concentrations and the spatial extents of the plume arising from Stage [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: channel. notably lower. Plume very small and located close to the dredging activity. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: 4 Again, peak concentrations close to the dredger are shown in the plume modelling [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:532: output. On the ebb phase, the plume can extend at low concentrations (<30mg/l) [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:534:represent a more conservative scenario, as sediment plume modelling outlined above indicates relatively [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:534:limited plume extents for the majority of the capital dredge for the proposed scheme. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:535:Additionally, sediment plume results for Smiths Dock monitoring point (point 3) indicated only temporary [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:535:be temporary which would disperse following cessation of the works. Plume extents during each of the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:537:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:538:zone of influence from the sediment plumes. As a result, a deterioration in ecological class status is not [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:539:peak migratory season, when a sediment plume creating a ‘barrier’ effect could cause a significant disruption [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:539:extent and impact of the plume. This allows a passage through which migratory fish will be able to move [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:539: dredging along the axis of the river to ensure the plumes are [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:544: • Cumulative effects of sediment plumes and associated effects on water quality and fish [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:545:Section 27 considers the potential cumulative effects of the proposed schemes on sediment plumes and [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:545:marine water quality. To summarise, whilst the sediment plumes could combine to cover a larger area of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:545:plumes spreading across the width of the channel. Additionally, due to navigational safety, it is unlikely that [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:549:strips thus limiting the plume extent. As a result, non- temporary effects on water quality and associated [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:550:would be sediment plumes associated with dredging simultaneously. However, on further consideration, [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:559:proposed scheme nor the modelled extent of the maximum-expected sediment plume from the capital [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:559:influence of the proposed scheme will be determined by the sediment plume during dredging activities. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:572:The capital dredging of the river will cause plumes of sediment to form. The plume effects arising from the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:572:operation, the plume effects will be observed throughout much of the approximately five-month period, but [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:572:of sediment from the plumes on the river or seabed will be very small. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:575:requires use of TSHD and BHD on soft sediment in the channel and berth pocket) will result in plumes of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:575:with plumes diminishing typically to levels of <30 mg/l but often <10mg/l at a distance of no more than a few [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:575:England, 2018a). The area affected by the sediment plume generated from proposed dredging, though [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:580:In terms of intra-project effects on foraging common terns, the zone of influence from the sediment plume [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:580:of the area would not be increased since the plume is considered to be the most far-reaching effect on tern [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:583:Effects on fish may be compounded by the combined sediment plumes of other projects or plans that may [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:584:An interaction between the sediment plumes would only occur in the unlikely event that the capital dredging [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:584:Plumes from each project would be temporary and short-lived. The same applies for the Anglo American [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:584:combined plumes is expected to be minor. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:584:sediment plumes occupy only half of the river cross section) has also been proposed for the NGCT project. [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:586:The zone of influence from predicted sediment plumes (including the combined plumes from the proposed [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf|MLA_2020_00507-PC1084_RHD-ZZ-XX-RP-Z-1100_EIA Report_main body-8.pdf]]:593:sediment plumes arising from dredging. Construction Industry Research and Information Association [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf]]:385: would be supported through the use of divers. There is the possibility of sediment plumes [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf]]:386:If your activity uses or releases chemicals (for example contaminants above action level 1.There is the possibility of sediment plumes during the [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf]]:387:outside the estuary but could delay or prevent fish There is the possibility of sediment plumes during the dredging works. Possibility of [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf|MLA_2020_00507-PC1084-RHD-ZZ-XX-RP-Z-1100_EIA Report_Appendices_Part2-4.pdf]]:388: There is the possibility of sediment plumes during the dredging works [[this>Teesworks/Planning/MLA_2020_00507/MLA_2020_00507-Licence Document (Marine)-14.pdf|MLA_2020_00507-Licence Document (Marine)-14.pdf]]:14: To restrict suspended sediment plumes to one side of the estuary at a time, in order to reduce loss of tern foraging [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:8:5 Hydrodynamic and sedimentary plume modelling report [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:55: Environmental Statement. modelling and modelling of sediment plume [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:57: Environmental Statement. 2014 modelling and modelling of sediment plume released from [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:60: • Sediment plume modelling: The updated and verified 3D Tees Estuary Tidal Model was used to [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:60: coupling with a sediment plume model built in MIKE21-MT software. The sediment plume model [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:91:offshore site will both result in sediment plumes. These effects have been investigated using numerical [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:91:changes in bed thickness when the suspended sediment falls from the plume to become deposited on the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:92: represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:92: become affected by a plume at some point during the dredging or disposal activities (in some areas [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:92:or river channel). To illustrate this, Figures 6.32 – 6.35 shows the maximum extent of the plume during a [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:92:When the dredger is at the south-western end of the transect, the maximum spatial extent of the plume on [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:92:Middlesbrough Dock. When the dredger is at the north-eastern end of the transect, the extent of the plume [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:92:new quay. However, in all cases considered, the lateral extent of the plume across the river channel is very [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:92:narrow and the magnitude of the SSC within the plume beyond a few hundred metres from the point of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:92:release is of the order of 10 to 20mg/l and in the extremities of the plume reduces further to the same order [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:93:Figure 6.32 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:94:Figure 6.33 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:95:Figure 6.34 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:96:Figure 6.35 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:97:Results from this scenario are broadly similar to those from Stage 1, but now separate plumes are created [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:97:plumes can coalesce and collectively occupy around half the width of the river channel as they move [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:98:Figure 6.37 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:99:Figure 6.38 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:99:plume (at low concentrations) becomes slightly greater; (ii) the extent of the plume across the river channel [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:99:becomes wider; and (iii) at times two plumes are created by the in-parallel dredging activities. Despite these [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:100:Figures 6.40 – 6.43 shows the maximum extent of the plume during a release from the south-western corner [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:100:and the spatial extents of the plume arising from Stage 3 of the dredging are much lower than those [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:101:Figure 6.40 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:102:Figure 6.41 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:103:Figure 6.42 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:104:Figure 6.43 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:104:the maximum plume extent and maximum SSC values within the plume are much lower than experienced [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:104:during both Stages 1 and 2 of the dredging (note the slight plume shown in the mid channel is a remnant of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:104:maximum extent of the plume is confined to within the length of the proposed quay and covers only a very [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:105:phase of the tide). Figure 6.45 and 6.46 shows the maximum extent of the plume during a release from the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:105:On the ebb phase, the plume can extend at low (<30mg/l) concentrations along the jetties of the Oil Terminal [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:105:Depot. Under no conditions does the plume enter Tees Dock at any significant concentration. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:106:Figure 6.45 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:107:Figure 6.46 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:107:the plume is created at the turning circle and along parts of the north bank of the river. As with previous [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:108:The sediment plumes that arise from the four stages of the dredging could potentially affect areas of riverbed [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:108:that during the predicted four months of dredging, all individual or coalesced plume effects are confined to [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:108:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:108:whilst all plumes associated with dredging of the turning circle are confined to the left bank (north of centre [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:109:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:110:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:110:zone of influence from the sediment plumes. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:111:Within this maximum zone of influence from sediment plumes and bed deposition, the following receptors [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:112:elevations in SSC drop rapidly after each dredging plume has dispersed, and return to baseline levels at [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:the 10-minute duration of disposal activity; and (iii) at selected intervals thereafter until the initial plume [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. It can then [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:This plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:At 30 minutes after cessation of discharge (Plot F), the plume is less than 250mg/l at its localised centre, [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:phase of the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:activity commences and starts to form its own sediment plume (Plot H), the initial plume has moved [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:sufficiently far from its point of release that it does not coalesce with the new plume and, by this time, is less [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:not visible in the plots at the magnitudes presented. The original plume continues to disperse such that [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:although when the discharge is made during the flooding tide, the plume moves in a south-easterly direction, [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:along the axis of principal tidal flows. At times when the release is around slack water, the plume tends to [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:118:west or south-east, respectively). However, when this occurs the concentration in the plume reduces readily [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:119:Figure 6.60 Plume of enhanced SSCs arising from disposal activities during Stage 1 of the capital [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:from the BHD (although the time intervals are greater), the initial plume has greater SSC values at its centre, [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:case for maximum SSC), the plume resides in spatial extent around the point of release during the slack [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:plume has started to move towards the south-east through advection by the flood tidal currents, and the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:release point (Plot F). At this point in time, the TSHD plume has further reduced in peak concentration to [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:around 200mg/l. Some 30 minutes later, the TSHD plume and subsequent BHD plume have fully coalesced, [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:with two peaks in concentration; the original TSHD plume has a peak now around 100mg/l locally at its [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:centre whilst the more recently formed (but smaller) BHD plume has a peak SSC value at its centre of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:previous TSHD release, the now fully coalesced plume has a peak SSC of around 100mg/l very locally and [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:plume remains present a further 45 minutes later, the original coalesced plume is considerably smaller in [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:successive disposal events, any coalescence of subsequent plumes would continue to result in only [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:120:coalescence of successive plumes at significant concentrations or for long durations is very low even during [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:121:Figure 6.61 Plume of enhanced SSCs arising from disposal activities during Stage 2 of the capital [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:122:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. The [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:122:plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:122:The plumes associated with Stage 3 disposal activities are generally lower in concentration than those for [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:122:Indeed, the plume arising from Stage 3 disposal activities fully disperses before the next subsequent [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:122:in this offshore area). Due to this, there is no possibility of plumes coalescing from Stage 3 disposal [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:123:Figure 6.4 Plume of enhanced SSCs arising from disposal activities during Stage 3 of the capital [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:124:Like during Stage 2, there is potential for the plume from a TSHD discharge to coalesce with a preceding or [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:124:Plot A shows the residual plume from a TSHD disposal some 5 minutes before the commencement of a [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:124:separate plumes at 45 minutes after cessation of the BHD discharge. A further 30 minutes later, another [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:124:TSHD release occurs within the previous BHD plume extent (Plot E). Peak concentrations from the TSHD [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:124:plume has widely dispersed, a further BHD release is made some 50 minutes later, again within the previous [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:124:(now coalesced) plumes. Despite this coalesced plume now containing elements of three separate [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:124:the residual plume shown in Plot A coalesce with the ‘three-release’ plume (Plot G), although the SSC [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:124:values at the point of overlap are very low (~10mg/l). Around 55 minutes later, the plume is now mostly [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:124:disposal site, leading to coalescence of subsequent plumes, the resulting temporary, short duration effects [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:125:Figure 6.5 Plume of enhanced SSCs arising from disposal activities during Stage 4 of the capital [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:126:for coalescence of subsequent plumes is greatest. In reality, subsequent disposals will be at different parts [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:126:At the extremities of the plume extent, there are wide zones of relatively low SSC values (<100mg/l). [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:126:sediment plume associated with one release event (this example being from Stage 1). It can be seen that [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:126:is negligible, whilst to the north it covers a similar zone to the sediment plume for this disposal event, which [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:130:the northern and southern boundaries (Figure 6.68). This correlates to the areas where a plume will extend [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:131:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:131:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:131:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:131:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:131:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:131:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:132:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:132:plume effects will be observed throughout much of the approximately four-month period, but at varying [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:132:extents during the four different stages. During Stages 1-3 the dredging-related plume effects will be largely [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:132:Dock and Tees Dock. During Stage 4 the dredging-related plume effects will be largely confined to the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:132:very minor magnitudes, in areas covering the same spatial extent as the sediment plumes. Where this [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:132:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:132:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:143: the findings of hydrodynamic and sedimentary plume [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:143: sediment and create smothering effects / turbidity / sediment plumes. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:144:are predicted to occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:157:Capital dredging would result in the creation of sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:157:In all tidal conditions modelled, the lateral extent of the plume across the river channel is very narrow and [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:157:the magnitude of concentrations within the plume beyond a few hundred metres from the point of release is [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:157:in the order of 10 - 20mg/l and in the extremities of the plume, reduces further to concentrations 0-10mg/l [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:157:Results for this stage were similar to those in Stage 1 but with separate plumes created by the different [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:157:dredgers. At some points in the cycle, areas of these initially separate plumes combine as they move [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:157:The maximum concentrations and the spatial extents of the plume arising from Stage 3 of the dredging are [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:157:and the production rate of dredging is notably lower. Figure 7.5 shows an example plume during Stage 3 [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:157:Again, peak concentrations close to the dredger are shown in the plume modelling output. On the ebb [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:157:phase, the plume can extend at low concentrations (<30mg/l) along the jetties of the Oil Terminal towards [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:158:Figure 7. 3 Plume of suspended sediment concentrations arising from dredging activities during Stage 2 [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:159:Figure 7. 4 Plume arising from dredging activities during Stage 1 of the capital dredge (release from the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:160:Figure 7. 5 Plume of suspended sediment concentrations arising from dredging activities during Stage [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:161:Figure 7.6 Plume of enhanced suspended sediment concentrations arising from dredging activities [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:162:sediment plume is not predicted to reach The Gares water quality monitoring point, no effects on the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:162:The relatively limited nature of the plume extents predicted for the proposed capital dredging indicates that [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:166:Additionally, information from sediment plume modelling (see Section 7.5.1) indicates that only the Smiths [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:194:hydrodynamic and sedimentary plume modelling undertaken. This section excludes consideration of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:210:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:210:dredging periods. The sediment plume generated by dredging would likely be dispersed by tidal currents [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:211:immediate vicinity of the dredger. Sediment plume modelling predicts different plume extents and [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:211:cases, the sediment plume is predicted to be very narrow within the river, with the phase of dredging with [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:211:extremities of the plume. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:211:All plumes associated with different stages of dredging in the vicinity of the proposed new quay are confined [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:211:to the southern bank of the river, whilst all plumes associated with dredging of the turning circle are confined [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:211:to the northern bank. No plume effects of a significant level above background values are anticipated to [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:211:The sediment plume modelling reported within Section 6 also extracted time series plots of changes in SSC [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:212:from the sediment plumes. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:212:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:256: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:257: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:296:In summary, the largest sediment plumes are likely to arise during Stage 2 of the dredging (i.e. BHD and [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:296:(it is not a sediment plume, rather a combined zone of influence). The sediment dispersion modelling of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:296:distance from the dredging vessel, both laterally and along the line of the vessel, with plumes diminishing [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:296:of this assessment, the sediment plume may be regarded as representing a temporary loss of foraging [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:297:terns do not forage to any significant extent within the predicted range of the sediment plume. Likewise, the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:297:England, 2018a), and the area likely to be affected by the sediment plume at any one time represents around [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:297:available even if the plume does result in temporary occlusion from the affected area. Furthermore, SSC [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:298:and the other stages of the dredge campaign would result in a smaller plume than that described for Stage [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:298: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:298: plume generated by operations is predicted to collectively occupy around half the width of the river [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:298:With the implementation of the above mitigation measure, the modelled plume would only occupy half of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:309:informed by the hydrodynamic and sedimentary plume modelling undertaken, as well as the understanding [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:318:details of the increase in SSC, including the visual output of sediment plume modelling for the capital [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:319:sediment plume creating a ‘barrier’ effect could cause a significant disruption to the annual migration pattern, [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:319:during a period of very hot and dry weather. Modelling of the sediment plume during capital dredging [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:320:vessel, both laterally and along the line of the vessel. The periphery of the plume (10 to 20 mg/l) extends [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:320:The cross section of the river channel affected by the plume is particularly relevant when considering [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:320:narrow plume along the axis of the river. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:320:period. However, while unlikely, it has to be taken into account that sediment plumes encompassing the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:320: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:320: plume generated by operations is predicted to remain on the same side of the river as the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:320:Mitigation of the plume effects by reducing the size of the TSHD, and thus reducing the rate of overflow, is [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:424:well as hydrodynamic and sedimentary plume modelling reported in Section 6. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:478:As the offshore disposal commences, a plume of sediment would be generated with the greatest [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:478:concentrations predicted at the end of the discharge period. The sediment plume is predicted to increase [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:478:At 30 minutes after cessation of discharge, the plume is less than 250mg/l at its localised centre, reducing [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:478:the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of less than [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:478:commences and starts to form its own sediment plume, the initial plume has moved sufficiently far from its [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:478:point of release that it does not coalesce with the new plume and, by this time, is less than 40mg/l in SSC [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:478:at the magnitudes presented. The original plume continues to disperse such that after 4 hours and 25 [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:478:At times when the release is around slack water, the plume tends to reside closer to the point of release for [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:478:However, when this occurs the concentration in the plume reduces readily because more material falls to [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:479:Based on the modelled effects of the sediment plume at the Tees Bay C disposal site described above, it is [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:490: influencing the same area as affected by the sediment plume); and, [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:491:the basis of the potential extent of the dredging and disposal plumes. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:500:All projects scoped into the CIA involve will involve capital dredging. This activity will create a plume of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:500:The extent of the sediment plume created by capital dredging is heavily dependent on the dredging plant [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:501:important to note that figures showing the “maximum extent of sediment plume dispersion and deposition” [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:501:do not represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:501:affected by a plume at some point during the dredging or disposal activities (in some areas this will be on a [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:501:Consequently, for the purposes of this CIA, the maximum zones of influence of sediment plume dispersion [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:501:of sediment plume dispersion and deposition onto the river and/or seabed during capital dredging [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:501:sediment in the water column was predicted to be in close proximity to the dredger, with plume dispersion [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:501:resulting in a significantly reduced concentration of suspended sediment beyond the source of the plume. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:501:material will be re-dredged as part of the capital works for each scheme. At the peripheries of each plume, [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:502:(right) as a result of the proposed scheme [Note: plots show sediment plume impacts arising from dredging [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:506:addition, the predictions made for each project represent sediment plume dispersion under specific tidal [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:506:where sediment plumes combine at peak concentration (as predicted by the EIA studies for each project) [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:506:at any location. Additionally, mitigation is outlined for all three schemes which would reduce plume extents [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:506:proposed scheme, it is considered unlikely that the plumes would overlap. As a result, there may be a [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:506:additional mitigation measures are identified to reduce any resulting sediment plume as far as possible and [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:507:plumes. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:507:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:513:plumes occupy only half of the river cross section) has also been proposed for the NGCT project. For the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:513:England, 2018a), the area affected even by the combined plumes is likely to be low (for example, should [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:513:dredging plumes together will still affect only around 0.5% of the SPA subtidal habitat (Royal [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:513:HaskoningDHV, 2015)). However, the additive effect of the sediment plumes from separate dredging [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:514:sediment plumes may deter such species from migrating to and from spawning sites. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:514:the respective sediment plumes could result in an additive effect, as demonstrated in Figures 27.1 to 27.3. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:514:Significantly, the effect of a combined plume is not likely to result in a different behavioural response in fish [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:514:compared with the effect of the projects in isolation, although the increased plume footprint may increase [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:514:of the sediment plumes from separate dredging campaigns cannot be completely avoided if the campaigns [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:522:WFD water body (approximately 6.3km, see Figure 28.1) and plume modelling results described in Section [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:528: measures identified for the Tees estuary. habitats located within sediment plumes created [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:532:Capital dredging within the river would result in sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:532: BHD working to dredge the In all tidal conditions modelled, the lateral extent of the plume across the river channel [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:532: upper soft material in the is very narrow and the magnitude of concentrations within the plume beyond a few [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:532: channel. extremities of the plume, reduces further to concentrations 0-10mg/l. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:532: 2 Results for this stage were similar to those in Stage 1 but with separate plumes [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:532: separate plumes combine as they move upstream and downstream according to the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:532: 3 BHD working to dredge the The maximum concentrations and the spatial extents of the plume arising from Stage [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:532: channel. notably lower. Plume very small and located close to the dredging activity. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:532: 4 Again, peak concentrations close to the dredger are shown in the plume modelling [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:532: output. On the ebb phase, the plume can extend at low concentrations (<30mg/l) [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:534:represent a more conservative scenario, as sediment plume modelling outlined above indicates relatively [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:534:limited plume extents for the majority of the capital dredge for the proposed scheme. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:535:Additionally, sediment plume results for Smiths Dock monitoring point (point 3) indicated only temporary [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:535:be temporary which would disperse following cessation of the works. Plume extents during each of the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:537:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:538:zone of influence from the sediment plumes. As a result, a deterioration in ecological class status is not [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:539:peak migratory season, when a sediment plume creating a ‘barrier’ effect could cause a significant disruption [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:539:extent and impact of the plume. This allows a passage through which migratory fish will be able to move [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:539: dredging along the axis of the river to ensure the plumes are [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:544: • Cumulative effects of sediment plumes and associated effects on water quality and fish [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:545:Section 27 considers the potential cumulative effects of the proposed schemes on sediment plumes and [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:545:marine water quality. To summarise, whilst the sediment plumes could combine to cover a larger area of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:545:plumes spreading across the width of the channel. Additionally, due to navigational safety, it is unlikely that [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:549:strips thus limiting the plume extent. As a result, non- temporary effects on water quality and associated [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:550:would be sediment plumes associated with dredging simultaneously. However, on further consideration, [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:559:proposed scheme nor the modelled extent of the maximum-expected sediment plume from the capital [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:559:influence of the proposed scheme will be determined by the sediment plume during dredging activities. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:572:The capital dredging of the river will cause plumes of sediment to form. The plume effects arising from the [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:572:operation, the plume effects will be observed throughout much of the approximately five-month period, but [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:572:of sediment from the plumes on the river or seabed will be very small. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:575:requires use of TSHD and BHD on soft sediment in the channel and berth pocket) will result in plumes of [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:575:with plumes diminishing typically to levels of <30 mg/l but often <10mg/l at a distance of no more than a few [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:575:England, 2018a). The area affected by the sediment plume generated from proposed dredging, though [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:580:In terms of intra-project effects on foraging common terns, the zone of influence from the sediment plume [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:580:of the area would not be increased since the plume is considered to be the most far-reaching effect on tern [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:583:Effects on fish may be compounded by the combined sediment plumes of other projects or plans that may [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:584:An interaction between the sediment plumes would only occur in the unlikely event that the capital dredging [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:584:Plumes from each project would be temporary and short-lived. The same applies for the Anglo American [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:584:combined plumes is expected to be minor. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:584:sediment plumes occupy only half of the river cross section) has also been proposed for the NGCT project. [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:586:The zone of influence from predicted sediment plumes (including the combined plumes from the proposed [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf|R-2020-0371-SCP-PC1084_R-2020-0371-SCP-RHD-ZZ-XX-RP-Z-1100_EIA_Report_main_body-from-gov-uk.pdf]]:593:sediment plumes arising from dredging. Construction Industry Research and Information Association [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-EA R_2020_0371_SCP 14 August 2020 OFFICIAL.pdf|R-2020-0371-SCP-EA R_2020_0371_SCP 14 August 2020 OFFICIAL.pdf]]:3:The plume modelling will be especially helpful in understanding the impacts to fish within [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084-RHD-SB-EN-NT-EV-1106.pdf|R-2020-0371-SCP-PC1084-RHD-SB-EN-NT-EV-1106.pdf]]:11:from the proposed dredging and disposal activity by coupling a sediment plume model built in MIKE21-MT [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084-RHD-SB-EN-NT-EV-1106.pdf|R-2020-0371-SCP-PC1084-RHD-SB-EN-NT-EV-1106.pdf]]:13:hydrodynamic and sedimentary regime assessment (particularly the plume dispersion modelling to [[this>Teesworks/Planning/R-2020-0371-SCP/R-2020-0371-SCP-PC1084-RHD-SB-EN-NT-EV-1106.pdf|R-2020-0371-SCP-PC1084-RHD-SB-EN-NT-EV-1106.pdf]]:15:sediment plume modelling will, however, be used to inform impacts to water quality as a result of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:3:informed by the hydrodynamic and sedimentary plume modelling undertaken, as well as the understanding [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:12:details of the increase in SSC, including the visual output of sediment plume modelling for the capital [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:13:sediment plume creating a ‘barrier’ effect could cause a significant disruption to the annual migration pattern, [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:13:during a period of very hot and dry weather. Modelling of the sediment plume during capital dredging [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14:vessel, both laterally and along the line of the vessel. The periphery of the plume (10 to 20 mg/l) extends [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14:The cross section of the river channel affected by the plume is particularly relevant when considering [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14:narrow plume along the axis of the river. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14:period. However, while unlikely, it has to be taken into account that sediment plumes encompassing the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14: plume generated by operations is predicted to remain on the same side of the river as the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_13. Fish and fisheries.pdf]]:14:Mitigation of the plume effects by reducing the size of the TSHD, and thus reducing the rate of overflow, is [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf|R-2020-0684-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf]]:11:from the proposed dredging and disposal activity by coupling a sediment plume model built in MIKE21-MT [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf|R-2020-0684-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf]]:13:hydrodynamic and sedimentary regime assessment (particularly the plume dispersion modelling to [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf|R-2020-0684-ESM-PC1084-RHD-SB-EN-NT-EV-1106_Appendix 2_Scoping note.pdf]]:15:sediment plume modelling will, however, be used to inform impacts to water quality as a result of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:4:hydrodynamic and sedimentary plume modelling undertaken. This section excludes consideration of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:20:In general, sediment plumes induced by dredging are considered to pose only a limited risk to water quality [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:20:dredging periods. The sediment plume generated by dredging would likely be dispersed by tidal currents [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:immediate vicinity of the dredger. Sediment plume modelling predicts different plume extents and [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:cases, the sediment plume is predicted to be very narrow within the river, with the phase of dredging with [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:extremities of the plume. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:All plumes associated with different stages of dredging in the vicinity of the proposed new quay are confined [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:to the southern bank of the river, whilst all plumes associated with dredging of the turning circle are confined [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:to the northern bank. No plume effects of a significant level above background values are anticipated to [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:21:The sediment plume modelling reported within Section 6 also extracted time series plots of changes in SSC [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:22:from the sediment plumes. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_9. Marine ecology.pdf]]:22:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:The capital dredging of the river and the offshore disposal of dredged sediments both will cause plumes of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:sediment to form. The plume effects arising from the river dredging are characterised by a short-lived [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:following hours. Since the dredging is a near-continuous operation, the plume effects will be observed [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected from the offshore [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:11:magnitude over a few hours after disposal. Deposition thicknesses of sediment from the plumes on the river [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:12:exceeding water quality standards was deemed to be low. Additionally, sediment plume modelling shows [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:12:resuspension of sediments. Such measures include dredging in long strips to ensure the plume is located [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:13:scheme footprint and the results of the hydrodynamic and sediment plume modelling, an impact of minor [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf|R-2020-0684-ESM-PC1084-RHD-ZZ-XX-RP-Z-1108_NTS.pdf]]:20:Based on the findings of hydrodynamic and sedimentary plume modelling, the disposal of dredged material [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:1: influencing the same area as affected by the sediment plume); and, [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:2:the basis of the potential extent of the dredging and disposal plumes. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:11:All projects scoped into the CIA involve will involve capital dredging. This activity will create a plume of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:11:The extent of the sediment plume created by capital dredging is heavily dependent on the dredging plant [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:important to note that figures showing the “maximum extent of sediment plume dispersion and deposition” [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:do not represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:affected by a plume at some point during the dredging or disposal activities (in some areas this will be on a [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:Consequently, for the purposes of this CIA, the maximum zones of influence of sediment plume dispersion [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:of sediment plume dispersion and deposition onto the river and/or seabed during capital dredging [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:sediment in the water column was predicted to be in close proximity to the dredger, with plume dispersion [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:resulting in a significantly reduced concentration of suspended sediment beyond the source of the plume. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:12:material will be re-dredged as part of the capital works for each scheme. At the peripheries of each plume, [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:13:(right) as a result of the proposed scheme [Note: plots show sediment plume impacts arising from dredging [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:17:addition, the predictions made for each project represent sediment plume dispersion under specific tidal [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:17:where sediment plumes combine at peak concentration (as predicted by the EIA studies for each project) [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:17:at any location. Additionally, mitigation is outlined for all three schemes which would reduce plume extents [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:17:proposed scheme, it is considered unlikely that the plumes would overlap. As a result, there may be a [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:17:additional mitigation measures are identified to reduce any resulting sediment plume as far as possible and [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:18:plumes. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:18:(deposition) from the sediment plume model were extracted at a series of points within the affected river [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:24:plumes occupy only half of the river cross section) has also been proposed for the NGCT project. For the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:24:England, 2018a), the area affected even by the combined plumes is likely to be low (for example, should [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:24:dredging plumes together will still affect only around 0.5% of the SPA subtidal habitat (Royal [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:24:HaskoningDHV, 2015)). However, the additive effect of the sediment plumes from separate dredging [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:25:sediment plumes may deter such species from migrating to and from spawning sites. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:25:the respective sediment plumes could result in an additive effect, as demonstrated in Figures 27.1 to 27.3. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:25:Significantly, the effect of a combined plume is not likely to result in a different behavioural response in fish [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:25:compared with the effect of the projects in isolation, although the increased plume footprint may increase [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_27. Cumulative impact assessment.pdf]]:25:of the sediment plumes from separate dredging campaigns cannot be completely avoided if the campaigns [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_1. Introduction.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_1. Introduction.pdf]]:8:5 Hydrodynamic and sedimentary plume modelling report [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_20. Flood risk and coastal defence.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_20. Flood risk and coastal defence.pdf]]:4:well as hydrodynamic and sedimentary plume modelling reported in Section 6. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-EIA_Scoping_Response_EIA201900017_FINAL.pdf|R-2020-0684-ESM-EIA_Scoping_Response_EIA201900017_FINAL.pdf]]:11:create smothering effects/turbidity/sediment plumes, thereby damaging benthic [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_11. Terrestrial ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_11. Terrestrial ecology.pdf]]:13: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_11. Terrestrial ecology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_11. Terrestrial ecology.pdf]]:14: hydrodynamic and sedimentary plume effects would not extend to [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:1:Hydro-dynamic and sedimentary plume modelling [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:9: a sediment plume model built in MIKE3-MT software. The sediment plume model was run for the entire [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:63:plume dispersion model are described in this section. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:67:The following assumptions have been made for the simulation of sediment plumes arising from dredging [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:70: to note that this type of figure does not represent a plume or deposition that would occur at any one [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:70: point in time (such plumes or deposition are shown in the animated timestep plots). Rather, this [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:70: affected by a plume or deposition at some point during the 4-months of dredging or disposal [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:72:although: (i) the lateral extent of the plume (at low concentrations) becomes slightly greater; (ii) the extent [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:72:of the plume across the river channel becomes wider; and (iii) at times two plumes are created by the in- [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:73:that during Stage 3 of the dredging, the maximum plume extent and maximum SSC values within the plume [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:73:are much lower than experienced during both Stage 1 and 2 of the dredging (note the slight plume shown [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:73:commences). During Stage 3, the maximum extent of the plume is confined to within the length of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:74:that during Stage 4 of the dredging, the plume is created at the turning circle and along parts of the north [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:75:and that during the 4 months of dredging, all plume effects are confined to within the river reaches that [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:75:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:75:plumes associated with dredging of the turning circle are confined to the left bank (north of centre line) [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:75:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:77:the plumes created by river dredging. It can be seen that much of the sediment falls to the bed within the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:77:that is affected by the zone of influence from the sediment plumes. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:78:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:78:single release point and the potential for coalescence of subsequent depositional plumes is greatest. In [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:78:a few km of the upstream and downstream boundaries. At the extremities of the plume extent, there are [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:78:sediment plume for this worst case. It can be seen that much of the sediment falls to the bed within the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:78:similar zone to the sediment plume. In reality, disposals will be at different points within the licensed area, [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:80:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:80:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:80:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:plume effects will be observed throughout much the 4-month period, but at varying extents during the four [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:different stages. During Stages 1-3 the dredging-related plume effects will be largely confined to the channel [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:During Stage 4 the dredging-related plume effects will be largely confined to the channel areas north of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:areas covering the same spatial extent as the sediment plumes. Where this occurs in the river channel or [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf|R-2020-0684-ESM-Appendix 5_Hydro-dynamic and sedimentary plume modelling report.pdf]]:81:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Officer Report 0684.pdf|R-2020-0684-ESM-Officer Report 0684.pdf]]:20:relatively limited nature of the plume extents predicted for the proposed [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Officer Report 0684.pdf|R-2020-0684-ESM-Officer Report 0684.pdf]]:44:reduce both the extent and impact of the dredged plume, as any plume [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Officer Report 0684.pdf|R-2020-0684-ESM-Officer Report 0684.pdf]]:92:plume at the disposal site concludes that there is limited potential for an [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:2: the findings of hydrodynamic and sedimentary plume [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:2: sediment and create smothering effects / turbidity / sediment plumes. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:3:are predicted to occur (e.g. sediment plumes generated during capital dredging and effects on tidal currents [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:Capital dredging would result in the creation of sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:In all tidal conditions modelled, the lateral extent of the plume across the river channel is very narrow and [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:the magnitude of concentrations within the plume beyond a few hundred metres from the point of release is [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:in the order of 10 - 20mg/l and in the extremities of the plume, reduces further to concentrations 0-10mg/l [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:Results for this stage were similar to those in Stage 1 but with separate plumes created by the different [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:dredgers. At some points in the cycle, areas of these initially separate plumes combine as they move [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:The maximum concentrations and the spatial extents of the plume arising from Stage 3 of the dredging are [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:and the production rate of dredging is notably lower. Figure 7.5 shows an example plume during Stage 3 [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:Again, peak concentrations close to the dredger are shown in the plume modelling output. On the ebb [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:16:phase, the plume can extend at low concentrations (<30mg/l) along the jetties of the Oil Terminal towards [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:17:Figure 7. 3 Plume of suspended sediment concentrations arising from dredging activities during Stage 2 [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:18:Figure 7. 4 Plume arising from dredging activities during Stage 1 of the capital dredge (release from the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:19:Figure 7. 5 Plume of suspended sediment concentrations arising from dredging activities during Stage [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:20:Figure 7.6 Plume of enhanced suspended sediment concentrations arising from dredging activities [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:21:sediment plume is not predicted to reach The Gares water quality monitoring point, no effects on the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:21:The relatively limited nature of the plume extents predicted for the proposed capital dredging indicates that [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_7. Marine sediment and water quality.pdf]]:25:Additionally, information from sediment plume modelling (see Section 7.5.1) indicates that only the Smiths [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:9:proposed scheme nor the modelled extent of the maximum-expected sediment plume from the capital [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:9:influence of the proposed scheme will be determined by the sediment plume during dredging activities. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:22:The capital dredging of the river will cause plumes of sediment to form. The plume effects arising from the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:22:operation, the plume effects will be observed throughout much of the approximately five-month period, but [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:22:of sediment from the plumes on the river or seabed will be very small. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:25:requires use of TSHD and BHD on soft sediment in the channel and berth pocket) will result in plumes of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:25:with plumes diminishing typically to levels of <30 mg/l but often <10mg/l at a distance of no more than a few [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:25:England, 2018a). The area affected by the sediment plume generated from proposed dredging, though [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:30:In terms of intra-project effects on foraging common terns, the zone of influence from the sediment plume [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:30:of the area would not be increased since the plume is considered to be the most far-reaching effect on tern [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:33:Effects on fish may be compounded by the combined sediment plumes of other projects or plans that may [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:34:An interaction between the sediment plumes would only occur in the unlikely event that the capital dredging [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:34:Plumes from each project would be temporary and short-lived. The same applies for the Anglo American [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:34:combined plumes is expected to be minor. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:34:sediment plumes occupy only half of the river cross section) has also been proposed for the NGCT project. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_29. Habitats Regulations Assessment.pdf]]:36:The zone of influence from predicted sediment plumes (including the combined plumes from the proposed [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 16_WFD scoping tables.pdf|R-2020-0684-ESM-Appendix 16_WFD scoping tables.pdf]]:2: would be supported through the use of divers. There is the possibility of sediment plumes [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 16_WFD scoping tables.pdf|R-2020-0684-ESM-Appendix 16_WFD scoping tables.pdf]]:3:If your activity uses or releases chemicals (for example contaminants above action level 1.There is the possibility of sediment plumes during the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 16_WFD scoping tables.pdf|R-2020-0684-ESM-Appendix 16_WFD scoping tables.pdf]]:4:outside the estuary but could delay or prevent fish There is the possibility of sediment plumes during the dredging works. Possibility of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-Appendix 16_WFD scoping tables.pdf|R-2020-0684-ESM-Appendix 16_WFD scoping tables.pdf]]:5: There is the possibility of sediment plumes during the dredging works [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_30. References.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_30. References.pdf]]:6:sediment plumes arising from dredging. Construction Industry Research and Information Association [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:1:WFD water body (approximately 6.3km, see Figure 28.1) and plume modelling results described in Section [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:7: measures identified for the Tees estuary. habitats located within sediment plumes created [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11:Capital dredging within the river would result in sediment plumes. To consider the potential extent and [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: BHD working to dredge the In all tidal conditions modelled, the lateral extent of the plume across the river channel [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: upper soft material in the is very narrow and the magnitude of concentrations within the plume beyond a few [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: channel. extremities of the plume, reduces further to concentrations 0-10mg/l. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: 2 Results for this stage were similar to those in Stage 1 but with separate plumes [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: separate plumes combine as they move upstream and downstream according to the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: 3 BHD working to dredge the The maximum concentrations and the spatial extents of the plume arising from Stage [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: channel. notably lower. Plume very small and located close to the dredging activity. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: 4 Again, peak concentrations close to the dredger are shown in the plume modelling [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:11: output. On the ebb phase, the plume can extend at low concentrations (<30mg/l) [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:13:represent a more conservative scenario, as sediment plume modelling outlined above indicates relatively [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:13:limited plume extents for the majority of the capital dredge for the proposed scheme. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:14:Additionally, sediment plume results for Smiths Dock monitoring point (point 3) indicated only temporary [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:14:be temporary which would disperse following cessation of the works. Plume extents during each of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:16:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:17:zone of influence from the sediment plumes. As a result, a deterioration in ecological class status is not [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:18:peak migratory season, when a sediment plume creating a ‘barrier’ effect could cause a significant disruption [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:18:extent and impact of the plume. This allows a passage through which migratory fish will be able to move [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:18: dredging along the axis of the river to ensure the plumes are [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:23: • Cumulative effects of sediment plumes and associated effects on water quality and fish [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:24:Section 27 considers the potential cumulative effects of the proposed schemes on sediment plumes and [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:24:marine water quality. To summarise, whilst the sediment plumes could combine to cover a larger area of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:24:plumes spreading across the width of the channel. Additionally, due to navigational safety, it is unlikely that [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:28:strips thus limiting the plume extent. As a result, non- temporary effects on water quality and associated [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_28. Water Framework Directive compliance assessment.pdf]]:29:would be sediment plumes associated with dredging simultaneously. However, on further consideration, [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:As the offshore disposal commences, a plume of sediment would be generated with the greatest [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:concentrations predicted at the end of the discharge period. The sediment plume is predicted to increase [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:At 30 minutes after cessation of discharge, the plume is less than 250mg/l at its localised centre, reducing [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of less than [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:commences and starts to form its own sediment plume, the initial plume has moved sufficiently far from its [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:point of release that it does not coalesce with the new plume and, by this time, is less than 40mg/l in SSC [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:at the magnitudes presented. The original plume continues to disperse such that after 4 hours and 25 [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:At times when the release is around slack water, the plume tends to reside closer to the point of release for [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:1:However, when this occurs the concentration in the plume reduces readily because more material falls to [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_26. Offshore disposal of dredged material.pdf]]:2:Based on the modelled effects of the sediment plume at the Tees Bay C disposal site described above, it is [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:27:In summary, the largest sediment plumes are likely to arise during Stage 2 of the dredging (i.e. BHD and [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:27:(it is not a sediment plume, rather a combined zone of influence). The sediment dispersion modelling of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:27:distance from the dredging vessel, both laterally and along the line of the vessel, with plumes diminishing [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:27:of this assessment, the sediment plume may be regarded as representing a temporary loss of foraging [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:28:terns do not forage to any significant extent within the predicted range of the sediment plume. Likewise, the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:28:England, 2018a), and the area likely to be affected by the sediment plume at any one time represents around [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:28:available even if the plume does result in temporary occlusion from the affected area. Furthermore, SSC [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:29:and the other stages of the dredge campaign would result in a smaller plume than that described for Stage [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:29: the width of the river. This is to reduce both the extent and impact of the dredged plume, as any [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:29: plume generated by operations is predicted to collectively occupy around half the width of the river [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_12. Marine and coastal ornithology.pdf]]:29:With the implementation of the above mitigation measure, the modelled plume would only occupy half of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-61586 Quay Planning Statement 09-11-20.pdf|R-2020-0684-ESM-61586 Quay Planning Statement 09-11-20.pdf]]:24: sediment plume modelling, an impact of minor adverse significance is predicted with regard to [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-61586 Quay Planning Statement 09-11-20.pdf|R-2020-0684-ESM-61586 Quay Planning Statement 09-11-20.pdf]]:30: Additionally, sediment plume modelling shows relatively limited areas of high suspended solids [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-61586 Quay Planning Statement 09-11-20.pdf|R-2020-0684-ESM-61586 Quay Planning Statement 09-11-20.pdf]]:30: dredging in long strips to ensure the plume is located only on one side of the channel at a time [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:5: Environmental Statement. modelling and modelling of sediment plume [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:7: Environmental Statement. 2014 modelling and modelling of sediment plume released from [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:10: • Sediment plume modelling: The updated and verified 3D Tees Estuary Tidal Model was used to [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:10: coupling with a sediment plume model built in MIKE21-MT software. The sediment plume model [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:41:offshore site will both result in sediment plumes. These effects have been investigated using numerical [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:41:changes in bed thickness when the suspended sediment falls from the plume to become deposited on the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42: represent a plume that would occur at any one point in time (such plumes are shown in the timestep [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42: become affected by a plume at some point during the dredging or disposal activities (in some areas [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:or river channel). To illustrate this, Figures 6.32 – 6.35 shows the maximum extent of the plume during a [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:When the dredger is at the south-western end of the transect, the maximum spatial extent of the plume on [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:Middlesbrough Dock. When the dredger is at the north-eastern end of the transect, the extent of the plume [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:new quay. However, in all cases considered, the lateral extent of the plume across the river channel is very [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:narrow and the magnitude of the SSC within the plume beyond a few hundred metres from the point of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:42:release is of the order of 10 to 20mg/l and in the extremities of the plume reduces further to the same order [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:43:Figure 6.32 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:44:Figure 6.33 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:45:Figure 6.34 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:46:Figure 6.35 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 1 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:47:Results from this scenario are broadly similar to those from Stage 1, but now separate plumes are created [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:47:plumes can coalesce and collectively occupy around half the width of the river channel as they move [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:48:Figure 6.37 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:49:Figure 6.38 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 2 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:49:plume (at low concentrations) becomes slightly greater; (ii) the extent of the plume across the river channel [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:49:becomes wider; and (iii) at times two plumes are created by the in-parallel dredging activities. Despite these [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:50:Figures 6.40 – 6.43 shows the maximum extent of the plume during a release from the south-western corner [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:50:and the spatial extents of the plume arising from Stage 3 of the dredging are much lower than those [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:51:Figure 6.40 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:52:Figure 6.41 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:53:Figure 6.42 (Plot C) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:54:Figure 6.43 (Plot D) – Plume of enhanced SSCs arising from dredging activities during Stage 3 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:54:the maximum plume extent and maximum SSC values within the plume are much lower than experienced [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:54:during both Stages 1 and 2 of the dredging (note the slight plume shown in the mid channel is a remnant of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:54:maximum extent of the plume is confined to within the length of the proposed quay and covers only a very [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:55:phase of the tide). Figure 6.45 and 6.46 shows the maximum extent of the plume during a release from the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:55:On the ebb phase, the plume can extend at low (<30mg/l) concentrations along the jetties of the Oil Terminal [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:55:Depot. Under no conditions does the plume enter Tees Dock at any significant concentration. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:56:Figure 6.45 (Plot A) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:57:Figure 6.46 (Plot B) – Plume of enhanced SSCs arising from dredging activities during Stage 4 of the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:57:the plume is created at the turning circle and along parts of the north bank of the river. As with previous [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:58:The sediment plumes that arise from the four stages of the dredging could potentially affect areas of riverbed [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:58:that during the predicted four months of dredging, all individual or coalesced plume effects are confined to [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:58:Furthermore, all plumes associated with dredging of the berthing pocket and river channel in the vicinity of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:58:whilst all plumes associated with dredging of the turning circle are confined to the left bank (north of centre [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:59:No plume effects (and by implication no deposition effects) of a significant level above background values [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:60:Sediment suspended within the dredging plumes will fall to the riverbed, either soon after disturbance or [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:60:zone of influence from the sediment plumes. [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:61:Within this maximum zone of influence from sediment plumes and bed deposition, the following receptors [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:62:elevations in SSC drop rapidly after each dredging plume has dispersed, and return to baseline levels at [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:Therefore, plumes arising from disposal activities and subsequent sediment deposition is unlikely to be of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:the 10-minute duration of disposal activity; and (iii) at selected intervals thereafter until the initial plume [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. It can then [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:This plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:At 30 minutes after cessation of discharge (Plot F), the plume is less than 250mg/l at its localised centre, [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:phase of the tide such that 1 hour after cessation of discharge (Plot G), the plume has a maximum SSC of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:activity commences and starts to form its own sediment plume (Plot H), the initial plume has moved [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:sufficiently far from its point of release that it does not coalesce with the new plume and, by this time, is less [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:not visible in the plots at the magnitudes presented. The original plume continues to disperse such that [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:although when the discharge is made during the flooding tide, the plume moves in a south-easterly direction, [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:along the axis of principal tidal flows. At times when the release is around slack water, the plume tends to [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:68:west or south-east, respectively). However, when this occurs the concentration in the plume reduces readily [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:69:Figure 6.60 Plume of enhanced SSCs arising from disposal activities during Stage 1 of the capital [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:from the BHD (although the time intervals are greater), the initial plume has greater SSC values at its centre, [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:case for maximum SSC), the plume resides in spatial extent around the point of release during the slack [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:plume has started to move towards the south-east through advection by the flood tidal currents, and the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:release point (Plot F). At this point in time, the TSHD plume has further reduced in peak concentration to [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:around 200mg/l. Some 30 minutes later, the TSHD plume and subsequent BHD plume have fully coalesced, [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:with two peaks in concentration; the original TSHD plume has a peak now around 100mg/l locally at its [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:centre whilst the more recently formed (but smaller) BHD plume has a peak SSC value at its centre of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:previous TSHD release, the now fully coalesced plume has a peak SSC of around 100mg/l very locally and [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:plume remains present a further 45 minutes later, the original coalesced plume is considerably smaller in [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:successive disposal events, any coalescence of subsequent plumes would continue to result in only [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:70:coalescence of successive plumes at significant concentrations or for long durations is very low even during [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:71:Figure 6.61 Plume of enhanced SSCs arising from disposal activities during Stage 2 of the capital [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:72:the offshore disposal commences (Plot B) a plume starts to be generated at the point of release. The [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:72:plume starts to increase in spatial extent shortly after cessation of discharge due to advection by tidal [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:72:The plumes associated with Stage 3 disposal activities are generally lower in concentration than those for [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:72:Indeed, the plume arising from Stage 3 disposal activities fully disperses before the next subsequent [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:72:in this offshore area). Due to this, there is no possibility of plumes coalescing from Stage 3 disposal [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:73:Figure 6.4 Plume of enhanced SSCs arising from disposal activities during Stage 3 of the capital [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:Like during Stage 2, there is potential for the plume from a TSHD discharge to coalesce with a preceding or [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:Plot A shows the residual plume from a TSHD disposal some 5 minutes before the commencement of a [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:separate plumes at 45 minutes after cessation of the BHD discharge. A further 30 minutes later, another [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:TSHD release occurs within the previous BHD plume extent (Plot E). Peak concentrations from the TSHD [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:plume has widely dispersed, a further BHD release is made some 50 minutes later, again within the previous [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:(now coalesced) plumes. Despite this coalesced plume now containing elements of three separate [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:the residual plume shown in Plot A coalesce with the ‘three-release’ plume (Plot G), although the SSC [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:values at the point of overlap are very low (~10mg/l). Around 55 minutes later, the plume is now mostly [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:74:disposal site, leading to coalescence of subsequent plumes, the resulting temporary, short duration effects [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:75:Figure 6.5 Plume of enhanced SSCs arising from disposal activities during Stage 4 of the capital [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:76:for coalescence of subsequent plumes is greatest. In reality, subsequent disposals will be at different parts [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:76:At the extremities of the plume extent, there are wide zones of relatively low SSC values (<100mg/l). [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:76:sediment plume associated with one release event (this example being from Stage 1). It can be seen that [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:76:is negligible, whilst to the north it covers a similar zone to the sediment plume for this disposal event, which [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:80:the northern and southern boundaries (Figure 6.68). This correlates to the areas where a plume will extend [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:The river dredging and offshore disposal activities will both cause plumes of sediment to form close to the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:release point of material into the water column. These plumes will disperse under wave and current action [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:Once a plume is generated, the highest SSC values will be recorded at the point of river dredging or offshore [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:advected away from the point of release by the prevailing currents. At the peripheries of each plume, the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:working in parallel, there could be instances where two separately formed plumes coalesce to form one [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:81:(spatially) larger plume. However, the same principles of dispersion by prevailing currents applies, with [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:The plume effects arising from the river dredging are characterised by a short-lived localised increase in [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:plume effects will be observed throughout much of the approximately four-month period, but at varying [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:extents during the four different stages. During Stages 1-3 the dredging-related plume effects will be largely [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:Dock and Tees Dock. During Stage 4 the dredging-related plume effects will be largely confined to the [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:very minor magnitudes, in areas covering the same spatial extent as the sediment plumes. Where this [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:The plume effects arising from the offshore disposal similarly show peak concentrations at the point of [[this>Teesworks/Planning/R-2020-0684-ESM/R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf|R-2020-0684-ESM-PC1084_RHD-ZZ-XX-RP-Z-1100_6. Hydrodynamic and sedimentary regime.pdf]]:82:are typically a few thousand mg/l at the point of disposal activity. Plumes become advected by tidal currents [[this>Teesworks/Planning/R-2022-0755-CD/R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf|R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf]]:986:Plume thickness 11.55 Assumed to be equal to the saturated aquifer thickness [[this>Teesworks/Planning/R-2022-0755-CD/R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf|R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf]]:994: Initial contaminant concentration in groundwater at plume core C0 1.00E+00 mg/l 0 10 20 30 40 50 60 15.0 2.41E-01 [[this>Teesworks/Planning/R-2022-0755-CD/R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf|R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf]]:994: Width of plume in aquifer at source (perpendicular to flow) Sz 6.50E+02 m 22.5 1.18E-01 [[this>Teesworks/Planning/R-2022-0755-CD/R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf|R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf]]:994: Plume thickness at source Sy 1.16E+01 m Dispersivity based on Xu0& EcksteinNote graph assumes plume disperses vertically in one direction only. An alternative [[this>Teesworks/Planning/R-2022-0755-CD/R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf|R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf]]:994: 1 0.1% of pathway length the centre of the plume is located at the mid-depth of the aquifer is 27.5 7.34E-02 [[this>Teesworks/Planning/R-2022-0755-CD/R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf|R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf]]:995: Initial contaminant concentration in groundwater at plume core C0 1.00E+00 mg/l 00 1050 20 100 30 150 40 200 50 250 [[this>Teesworks/Planning/R-2022-0755-CD/R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf|R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf]]:995: Width of plume in aquifer at source (perpendicular to flow) Sz 6.50E+02 m 90.0 3.66E-03 [[this>Teesworks/Planning/R-2022-0755-CD/R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf|R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf]]:995: Plume thickness at source Sy 1.16E+01 m Dispersivity based on Xu 0 [[this>Teesworks/Planning/R-2022-0755-CD/R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf|R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf]]:995: (1995)graph assumes plume disperses vertically in one direction only. An alternative 100.0 1.96E-03 [[this>Teesworks/Planning/R-2022-0755-CD/R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf|R-2022-0755-CD-10035117-AUK-XX-XX-RP-ZZ-0428-04-LWoW_DQRA.pdf]]:995: Dispersivities 10%, 1%,10.1% of pathway length the centre of the plume is located at the mid-depth of the aquifer is 110.0 1.05E-03 [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Appendix 8.3 WFD.pdf|R-2020-0411-FFM-Appendix 8.3 WFD.pdf]]:27: Note that a footprint may also be a temperature or sediment plume. For dredging activity, a footprint is 1.5 times the dredge area. [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 5 Planning Policy.pdf|R-2020-0411-FFM-Chapter 5 Planning Policy.pdf]]:12:5.2.71 Paragraph 5.9.2 notes that cooling towers, exhaust stacks and the associated steam plumes have [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 11 Air Quality.pdf|R-2020-0411-FFM-Chapter 11 Air Quality.pdf]]:9: dispersion of the plume. [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 11 Air Quality.pdf|R-2020-0411-FFM-Chapter 11 Air Quality.pdf]]:11: and also allows for the effect of plume rise, complex terrain, buildings and deposition. Dispersion [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 11 Air Quality.pdf|R-2020-0411-FFM-Chapter 11 Air Quality.pdf]]:11: • Wind direction determines the sector of the compass into which the plume of stack exhaust [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 11 Air Quality.pdf|R-2020-0411-FFM-Chapter 11 Air Quality.pdf]]:12: • Wind speed affects the distance that the plume travels over time and can affect plume [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 11 Air Quality.pdf|R-2020-0411-FFM-Chapter 11 Air Quality.pdf]]:12: dispersion by increasing the initial dilution of pollutants and inhibiting plume rise; and [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 11 Air Quality.pdf|R-2020-0411-FFM-Chapter 11 Air Quality.pdf]]:12: motion. It therefore, affects the spread of the plume as it travels away from the source. New [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 11 Air Quality.pdf|R-2020-0411-FFM-Chapter 11 Air Quality.pdf]]:12:11.2.54 The roughness of the terrain over which a plume passes can have a significant influence on [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 11 Air Quality.pdf|R-2020-0411-FFM-Chapter 11 Air Quality.pdf]]:14: buildings to avoid wake effects bringing the undiluted plume down to the ground. [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 11 Air Quality.pdf|R-2020-0411-FFM-Chapter 11 Air Quality.pdf]]:32: Environment Agency (2007) Review of methods for NO to NO2 conversion in plumes at short [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Chapter 2 Project Description.pdf|R-2020-0411-FFM-Chapter 2 Project Description.pdf]]:13:2.4.57 The air quality and plume dispersion modelling used to identify the stack height necessary for [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-Appendix 11.2 - Detailed Baseline Assessment.pdf|R-2020-0411-FFM-Appendix 11.2 - Detailed Baseline Assessment.pdf]]:6: μg.m-3 at rural sites exposed to coal-fired power station plumes. [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-11366_REC Planning Statement_S_AS.pdf|R-2020-0411-FFM-11366_REC Planning Statement_S_AS.pdf]]:23:3.1.57 The air quality and plume dispersion modelling used to identify the stack height necessary for [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-11366_REC Planning Statement_S_AS.pdf|R-2020-0411-FFM-11366_REC Planning Statement_S_AS.pdf]]:48:4.4.67 Paragraph 5.9.2 notes that cooling towers, exhaust stacks and the associated steam plumes have [[this>Teesworks/Planning/R-2020-0411-FFM/R-2020-0411-FFM-11366_REC Planning Statement_S_AS.pdf|R-2020-0411-FFM-11366_REC Planning Statement_S_AS.pdf]]:48: cooling towers and minimal water vapour plumes. Moreover, the stack height has been optimised [[this>Teesworks/Planning/R-2023-0179-SCP/R-2023-0179-SCP-HyGreen Production Facility Scoping Report_FINAL.pdf|R-2023-0179-SCP-HyGreen Production Facility Scoping Report_FINAL.pdf]]:65: contamination hotspots or plumes, quantitative risk assessment, remediation and [[this>Teesworks/Planning/R-2020-0819-ESM/R-2020-0819-ESM-Dorman Point - Planning Statement - Dec 2020.pdf|R-2020-0819-ESM-Dorman Point - Planning Statement - Dec 2020.pdf]]:45: development are dust deposition, resulting in the soiling of surfaces; visible dust plumes; [[this>Teesworks/Planning/R-2020-0819-ESM/R-2020-0819-ESM-Dorman Point ES - Vol 2 - Chapter F - Air Quality - Dec 2020.PDF|R-2020-0819-ESM-Dorman Point ES - Vol 2 - Chapter F - Air Quality - Dec 2020.PDF]]:10: development are dust deposition, resulting in the soiling of surfaces; visible dust plumes; [[this>Teesworks/Planning/R-2020-0819-ESM/R-2020-0819-ESM-Dorman Point ES - Vol 2 - Chapter L - LVIA - Dec 2020.PDF|R-2020-0819-ESM-Dorman Point ES - Vol 2 - Chapter L - LVIA - Dec 2020.PDF]]:28: station and chimney stack, with plumes of steam emerging into the skyline. Nearby Errington [[this>Teesworks/Planning/R-2020-0822-ESM/R-2020-0822-ESM-Long Acres ES - Vol 2 - Chapter L - LVIA - Dec 2020.PDF|R-2020-0822-ESM-Long Acres ES - Vol 2 - Chapter L - LVIA - Dec 2020.PDF]]:28: station and chimney stack, with plumes of steam emerging into the skyline. Nearby Errington [[this>Teesworks/Planning/R-2020-0822-ESM/R-2020-0822-ESM-Long Acres ES - Vol 2 - Chapter F - Air Quality - Dec 2020.PDF|R-2020-0822-ESM-Long Acres ES - Vol 2 - Chapter F - Air Quality - Dec 2020.PDF]]:10: development are dust deposition, resulting in the soiling of surfaces; visible dust plumes; [[this>Teesworks/Planning/R-2023-0227-CD/R-2023-0227-CD-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf|R-2023-0227-CD-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf]]:26: increased turbulence can cause greater plume mixing. [[this>Teesworks/Planning/R-2023-0227-CD/R-2023-0227-CD-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf|R-2023-0227-CD-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf]]:26: • The rise and trajectory of the plume may be depressed slightly by the flow distortion. This [[this>Teesworks/Planning/R-2023-0227-CD/R-2023-0227-CD-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf|R-2023-0227-CD-TV_ERF_Air_Quality_Emissions_Modelling_Report.pdf]]:34: the quantity of pollutants emitted but also to reduce the buoyancy of the plume due to momentum.