![]() ![]() Scanning electron micrographic of a long-jawed spider head.Įnvironmental samples from the Ottawa and Ashtabula rivers were analyzed for polychlorinated biphenyl (PCB) contamination. Louis River AOC, were analyzed for mercury, mercury stable isotopes, and carbon and nitrogen stable isotopes. In addition, samples from across the entire St. Water, sediment, benthic invertebrates, fish and riparian spiders were collected from Thompson and Scanlon Reservoirs and analyzed for mercury and dioxins. ![]() Louis River AOC were summarized and used to characterize baseline conditions prior to remediation. Survey results from prior sediment, water, and biota along with environmental sampling in the St. USGS designed and implemented monitoring strategies to assess effectiveness of these remedies. USEPA employed environmental dredging in the Ottawa and Ashtabula Rivers designated Areas-of-Concern (AOCs) and is planning to cap contaminated sediments in some portions of the St. Louis River (tributary to Lake Superior). USGS scientists collaborated with the USEPA to provide guidance for assessing the effectiveness of environmental remediation projects in the Ottawa and Ashtabula rivers (tributaries to Lake Erie) and Thompson and Scanlon reservoirs in the St.
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