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--- why_the_tees_is_bad_river_to_dredge [2026/01/05 22:57] – nefcadmin
+++ why_the_tees_is_bad_river_to_dredge [2026/01/07 08:34] (current) – [River Tees] nefcadmin
@@ Line 1: / Line 1: @@
-The graphs below show the average total levels of different classes of contaminants taken as part of the licensing of different port dredges around the UK.  The River Tees is responsible for a large of the UK's disposal of contamination in UK waters, both because of the consistently elevated levels of contamination within the dredged sediment and also due to the large quantities of material dredge each year.
+The graphs below show the average total levels of different classes of contaminants taken as part of the licensing of different port dredges around the UK.  The River Tees is responsible for a large part of the UK's disposal of contamination in UK waters, both because of the consistently elevated levels of contamination within the dredged sediment and also due to the large quantities of material dredge each year.
-Looking at polycyclic aromatic hydrocarbons (PAHs), gives a sense of level to which the River Tees is contaminated.
+The average total contamination load in mg per kg for the River Tees varies from 860mg/kg to 450mg/kg within the berths and river to below 100mg/kg in the sea approaches.
+Nowhere in the Mersey channels does the average total contamination load exceed 170mg/kg, or 510mg/kg in the docks.
+Nowhere in the Harwich dredged areas does the average total contamination load exceed 220mg/kg.
 The total PAH level in the River Tees sediment is 10x that in Harwich sediment, 4x that in Mersey Docks sediment, 20x that in River Mersey Channel and Approaches.
+Looking at polycyclic aromatic hydrocarbons (PAHs), gives a sense of one of the specific threats which dredging of the River Tees presents.
@@ Line 11: / Line 17: @@
 A level of 20mg/kg of total PAH is representative of the material which has been dredged from the River Tees over the last decade.
+[[?durl=https://northeastfc.uk/AroundUK/CEFAS/Dredge%20Contaminant%20Seabed%20Data%201998%20to%202019-mod.xlsx&dlat=54.6&dlon=-1.2&drad=3000&status=https://northeastfc.uk/NEMRG/sde/250727MLA201500088AllSamples.sde&shapes=https://northeastfc.uk/RiverTees/MaintenanceDredging/251224tees-exclusion-zones-traced-from-MMO-map,https://northeastfc.uk/RiverTees/MaintenanceDredging/251208TeesHartlepoolDredgeAreas.kml&selcharts=physicaldata,tracemetaldata,pahdata,pcbdata,bdedata,organotinsdata,organochlorinedata&subcharts=samplegroup,chemicalgroup,gorhamtest,totalhc,pahratios,ringfractions,eparatios,simpleratios,congenertest,pcanormalise,pcalmw,pcahmw,pcaepa,pcasmallpts,pcaorganiccarbon,splitbyweight,splitbyarea,totalsolidsandtotalcarbon,cumulative&sort=none&dredgevol=https://northeastfc.uk/RiverTees//TeesMaintenanceAnnualDredgeReview/Dredge-2001-2024.ods|2001-2024 Tees Samples]]
 ===== MLA/2025/00263 =====
 {{ :mla_2025_00263-tees-contaminationaverage-mgperkg.png?direct&800 |}}
+[[https://steps39.github.io/SedDataExp/SedimentDataExplorer.html?urls=https://www.northeastfc.uk/RiverTees/Planning/MLA_2025_00263/Additional%20Documents/MMO%20Results%20Template%20MAR02481%20V3.xlsm,https://www.northeastfc.uk/RiverTees/Planning/MLA_2025_00263/Additional%20Documents/MMO%20Results%20Template%20MAR02499%20V3.xlsm&shapes=https://northeastfc.uk/RiverTees/MaintenanceDredging/251224tees-exclusion-zones-traced-from-MMO-map,https://northeastfc.uk/RiverTees/MaintenanceDredging/251208TeesHartlepoolDredgeAreas.kml&selcharts=physicaldata,tracemetaldata,pahdata,pcbdata,bdedata,organotinsdata,organochlorinedata&subcharts=samplegroup,chemicalgroup,gorhamtest,totalhc,pahratios,ringfractions,eparatios,simpleratios,congenertest,pcanormalise,pcalmw,pcahmw,pcaepa,pcasmallpts,pcaorganiccarbon,splitbyweight,splitbyarea,totalsolidsandtotalcarbon,cumulative&sort=none&dredgevol=https://northeastfc.uk/RiverTees//TeesMaintenanceAnnualDredgeReview/Dredge-2001-2024.ods|Interactive Analysis]]
 ===== MLA/2015/00088 =====
 {{ :mla_2015_00088-tees-contaminationaverage-mgperkg.png?direct&800 |}}
+[[https://steps39.github.io/SedDataExp/SedimentDataExplorer.html?status=https://northeastfc.uk/NEMRG/sde/250727MLA201500088AllSamples.sde|Interactive Analysis]]
 ====== Mersey ======
@@ Line 29: / Line 41: @@
 {{ :mla_2021_00202-mersey-contaminationaverage-mgperkg.png?direct&800 |}}
+[[https://steps39.github.io/SedDataExp/SedimentDataExplorer.html?urls=https://northeastfc.uk/AroundUK/Planning/MLA_2021_00202/Additional%20Documents/MMO_Results_Template%20-%20MAR00922%20V2.xlsm,https://northeastfc.uk/AroundUK/Planning/MLA_2021_00202/Additional%20Documents/MMO_Results_Template%20-%20MAR00925.xlsm,https://northeastfc.uk/AroundUK/Planning/MLA_2021_00202/Additional%20Documents/MMO_Results_Template%20-%20MAR00930.xlsm,https://northeastfc.uk/AroundUK/Planning/MLA_2021_00202/Additional%20Documents/MMO_Results_Template%20-%20MAR00922%20V3.xlsm,https://northeastfc.uk/AroundUK/Planning/MLA_2021_00202/Additional%20Documents/MMO_Results_Template%20-%20MAR00925%20v2.xlsm|Interactive Analysis]]
 ===== MLA_2014_00573 - Liverpool Docks =====
@@ Line 37: / Line 51: @@
 {{ :mla_2014_00573-liverpooldocks-contaminationaverage-mgperkg.png?direct&800 |}}
+[[https://steps39.github.io/SedDataExp/SedimentDataExplorer.html?urls=https://northeastfc.uk/AroundUK/Planning/MLA_2014_00573/3/Additional%20Documents/SAM201800033_MAR001|Interactive Analysis]]
 ====== Harwich ======
@@ Line 47: / Line 63: @@
 {{ :mla_2023_00020-harwich-contaminationaverage-mgperkg.png?direct&800 |}}
+[[https://steps39.github.io/SedDataExp/SedimentDataExplorer.html?urls=https://northeastfc.uk/AroundUK/Planning/MLA_2023_00020/Additional%20Documents/MAR01269%20MMO%20Extended%20Template_v1.xlsm|Interactive Analysis]]