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WASHINGTON (AP) - Contaminated sediments in rivers and bays from coast to coast pose an environmental hazard, and while dredging reduces the sediment it doesn't always solve the problem, the National Research Council reported Tuesday.
Inevitably dredging leaves some contamination behind, and in some cases further treatment is necessary, such as capping with a layer of clean material, the council said.
In addition, the dredging process itself can release some contamination into the environment, said the council, an arm of the National Academy of Sciences.
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