Coincidentally, studied a sediment core from Teltow canal in Berlin, which was severely exposed to DDT and lindane in the former GDR, albeit by a chemical factory (VEB Berlin Chemie). They found DDMS as the second most abundant TP after DDD, which showed at least 2 times higher concentrations. The lowest part of their core had been deposited seven years before the sampling. DDD concentrations were still 44 times above those of DDT and 15 times above DDE.