Capping and Controlled Disposal of Contaminated Dredged Material,
ARMY ENGINEER DISTRICT NEW YORK
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Bioassaybioaccumulation testing results indicate that about 5 of proposed dredging projects consist of sediments which exhibit an unacceptable level of toxicity andor bioaccumulation potential which would prohibit their unrestricted ocean disposal. Capping of these sediments with uncontaminated dredged material has been conducted in Long Island Sound and the Atlantic Ocean in order to isolate the contamination from the marine environment. Studies of these capping projects demonstrate the effectiveness of capping as a way to provide a barrier to chemical diffusion and prevent resuspension of contaminated dredged material. In addition, information is presented on a proposed study to investigate the use of depressions formed by sand mining in the bottom of New York Harbor for the disposal of dredged material with subsequent capping.