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Discusses a trend monitoring program for persistent, bioaccumulative, toxic (PBT) chemicals. Many chemicals were detected at high frequencies. PCBs were found in 100% of the samples. DDT and its metabolites, dieldrin, and endosulfan and its metabolites were found in over half of the samples. PBDEs were detected in 96% of the samples, primarily as penta-BDE. Pentachloroanisole (PCA) was found in 74% of the samples.
A trend monitoring design is proposed for chlorinated pesticides, polychlorinated biphenyls, and polybrominated diplenyl ethers in nine major Washington rivers and lakes.