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Central Long Island Sound, Connecticut

Central Long Island Sound Disposal siteThe Central Long Island Sound Disposal Site (CLDS) is one of four regional dredged material disposal sites located in the waters of Long Island Sound. CLDS covers a 11.04 km² (3.2 nmi²) area and is centered at 41° 08.950' N, 72° 52.950' W (NAD 83). It is located approximately 10.89 km (5.6 nmi) south of South End Point, East Haven, Connecticut. Historically, CLDS has been one of the most active disposal sites in the New England region. Since 1980, 8,339,136 yd3 of dredged material have been disposed of at the site. Sediments deposited at CLDS have been dredged from New Haven, Bridgeport, Stamford, and Norwalk Harbors, as well as other adjacent coastal areas. Since 1977, the management strategy at CLDS has entailed the controlled placement of small to moderate volumes of sediment to form individual disposal mounds on the seafloor. These discrete disposal mounds are monitored individually to assess mound stability, material thickness, and benthic recolonization status relative to the results of previous monitoring surveys and in comparison to ambient sediments within nearby reference areas. Beginning in 1984, this management strategy was modified to include the selection of dredged material placement locations in a manner that would promote the development of rings of disposal mounds on the CLDS seafloor. The networks of mounds would form containment cells on the seafloor that would facilitate subsequent large-scale confined aquatic disposal (CAD) operations. Containment cells are useful in limiting the lateral spread of unacceptably contaminated dredged material to facilitate efficient coverage with capping dredged material. The New Haven 1993 (NHAV 93) Mound represents the first CAD mound developed at CLDS. Currently, two additional containment cells are nearing completion on the CLDS seafloor.

Relevant DAMOS Reports