Sediment Dredging at Superfund MegasitesSediment Dredging at Superfund Megasites Some of the nation's estuaries, lakes and other water bodies contain contaminated sediments that can adversely affect fish and wildlife and may then find their way into people's diets. Dredging is one of the few options available for attempting to clean up contaminated sediments, but it can uncover and re suspend buried contaminants, creating additional exposures for wildlife and people. At the request of