Construction with Large Stone
Construction with Large Stone

Author: United States Army Corps of Engineers

Publisher: University Press of the Pacific

Published: 2004-10-01

Total Pages: 72

ISBN-13: 9781410217158

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This manual establishes criteria and presents guidance for the selection, evaluation, and use of large-stone materials in construction. Construction with Large Stone summarizes the results of many years of experience in the selection and use of rock materials in all forms of engineered structures. As individual stone sizes increase as a function of design requirements, natural and man-made disparities and flaws in rock have an increasingly greater influence on performance and time dependent durability. As a result, the guidance in this manual was developed specifically to be applied on those projects requiring large riprap, jetty stone, and cap stone. However, the principles and guidance found in this manual may be applied to any stone requirements greater in size than concrete aggregate.

Sediment Dredging at Superfund Megasites
Sediment Dredging at Superfund Megasites

Author: National Research Council

Publisher: National Academies Press

Published: 2007-10-30

Total Pages: 316

ISBN-13: 0309134102

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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.