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Maintenance dredging is proposed for the Black Rock Harbor-Cedar Creek Federal navigation channel and the western portion of the Bridgewater Harbor Anchorage Area. Approximately 10,000 to 15,000 cubic yards (c.y.) of sediment from the central section of the channel would be dredged by a hydraulic dredge and deposited onto an intertidal mudflat area which would be confined by a steel bulkhead. An upland-intertidal marsh habitat would be created for a proposed field research program (Field Verification Program (AFVP)) which would study the long term impacts of this type of disposal. The remainder of the sediments derived from the central section of the channel(70,000 c.y.) would be dredged by clamshell dredge and deposited in an uncapped mound at the Central Long Island Sound Disposal Site, near New Haven. This deposit would also be studied under the FVP. The remainder of the sediments from the upper and lower sections of the channel, sediment from private dredging areas, and the sediments from the Bridgeport Harbor Anchorage Area would be disposed at a separate capped mound at the Central Long Island Sound Disposal area. The FVP study may include a comparison of the uncapped and capped mounds.
Contaminated marine sediments threaten ecosystems, marine resources, and human health. They can have major economic impacts when controversies over risks and costs of sediment management interfere with needs to dredge major ports. Contaminated Sediments in Ports and Waterways examines management and technology issues and provides guidance that will help officials make timely decisions and use technologies effectively. The book includes recommendations with a view toward improving decision making, developing cost-effective technologies, and promoting the successful completion of cleanup projects. The volume assesses the state of practice and research and development status of both short-term and longer-term remediation methods. The committee provides a conceptual overview for risk-based contaminated sediment management that can be used to develop plans that address complex technological, political, and legal issues and the interests of various stakeholders. The book emphasizes the need for proper assessment of conditions at sediment sites and adequate control of contamination sources.