Environmental Assessment/Section 404(b) Evaluation and Finding of no Significant Impact for the Main-Tenance Dredging of the Black Rock Harbor-Cedar Creek Federal Navigation Channel, Bridgeport, Connecticut

摘要

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.