From memory, is the site not also contaminated with historic chemical waste from the old Whites Chemical works?
https://www.heraldscotland.com/news/17440856.polmadie-burn-glasgow-sealed-off-dangerous-levels-cancer-causing-chromium/#:~:text=DANGEROUS%20levels%20of%20a%20toxic,high%20concentrations%20of%20hexavalent%20chromium.