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--- 260318_-_stdc_-_south_tees_site_runoff_environmental_assessments [2026/06/22 09:16] – [21st May 2026] nefcadmin
+++ 260318_-_stdc_-_south_tees_site_runoff_environmental_assessments [2026/06/22 09:19] (current) – [Analysis] nefcadmin
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 In the aftermath of the crab die-off many people thought that the presence on the South Tees site of 100s of tonnes of chemicals which were highly toxic to the marine environment could not be just a coincidence.  However, this was ruled out as possible cause of the die-off by the [[Independent expert assessment of unusual crustacean mortality in the North-east of England in 2021 and 2022]] (CMEP - Crustacean Expert Mortality Panel).
-The EIR response [[260318_-_stdc_-_comah_chemical_inventory]] shows that not only was 1000s not 100s of tonnes of highly toxic chemicals in the open on the South Bank site and this material was being actively worked in September / October 2021 ([[260318_-_stdc_-_disposal_records_of_coke_ovens_hazardous_by-products]]), but in this EIR response a release of over 300kg per day was recorded in the measurement of polycyclic aromatic hydrocarbons (PAHs) in the outfall to the River Tees from the site.
+The EIR response [[260318_-_stdc_-_comah_chemical_inventory]] shows that not only was 1000s not 100s of tonnes of highly toxic chemicals in the open on the South Bank site and this material was being actively worked in September / October 2021 ([[260318_-_stdc_-_disposal_records_of_coke_ovens_hazardous_by-products]]), but in this EIR response a release of over 300kg per day was recorded in the measurement of polycyclic aromatic hydrocarbons (PAHs) in the outfall to the River Tees from the Redcar site.
 While it is now know that a release of PAHs occurred in late September / early October, it is not known whether this resulted in 1s or 10s of tonnes of PAHs being released.  The total inventory on site was over 4000 tonnes so only 1% loss would have released 4 tonnes.
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 === The Shock ====
+The location of the release was finally confirmed as R1, the outfall from the Redcar site.
 The data supplied documents a massive release of polycyclic aromatic hydrocarbons (PAHs) which started at some time between 28th September and 7th October 2021 (based on PAH measurements) and had ended by 1st November 2021 (based on suspended solids / COD returning to pre-levels).