Thread: Stock "bleeding" oil

Chlorinated solvents are denser than water and sink to the lowest point they can reach in groundwater where they sit for a long time, taking decades to break down. They slowly give off toxic fumes that can penetrate buildings (basements and sub levels especially) and build up to hazardous levels. Carbon tetrachloride breaks down to trichloroethane, then dichlor, then vinyl chloride which causes some rather serious illnesses. It costs a fortune to remediate sites where it has been spilled, like mechanical and engineers workshops and of course dry cleaner sites where this was used.