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Sediment Dredging at Superfund Megasites: Assessing the Effectiveness

Autor Committee on Sediment Dredging at Superf
en Limba Engleză Paperback – noi 2007

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 Congress, EPA asked the National Research Council (NRC) to evaluate dredging as a cleanup technique. The book finds that, based on a review of available evidence, dredging's ability to decrease environmental and health risks is still an open question. Analysis of pre-dredging and post-dredging at about 20 sites found a wide range of outcomes in terms of surface sediment concentrations of contaminants: some sites showed increases, some no change, and some decreases in concentrations. Evaluating the potential long-term benefits of dredging will require that the U.S. Environmental Protection Agency step up monitoring activities before, during and after individual cleanups to determine whether it is working there and what combinations of techniques are most effective.

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Specificații

ISBN-13: 9780309109772
ISBN-10: 0309109779
Pagini: 294
Dimensiuni: 152 x 226 x 18 mm
Greutate: 0.5 kg
Editura: National Academies Press

Descriere

This report assesses the effectiveness of cleaning up contaminates sediments in aquatic environment, whether through dredging or other techniques, at sites at which remediation costs over $50 million. The authors held three public sessions at which they heard presentations on dredging projects and heard from interested parties, including the public. Here they describe what they learned about sediment management at superfund megasites, the framework for evaluation of effectiveness of environmental dredging in reducing risks, the factors affecting effectiveness, and means of monitoring sites, practices and projects. They make recommendations that will improve future decision-making.