Description: The Cape Arundel Disposal Site (CADS) is located approximately 2.8 nmi (5.1 km) southeast of Cape Arundel, Maine. The site consists of a 500 yd diameter circle centered at 43° 17.805' N, 70° 27.170' W (NAD 83). Its bottom topography is characterized by a north-south trending trough running 1 km in length and 50 to 250 m wide. This trough has a maximum depth of 43 m and a silt/clay bottom admixed with fine sand. It is flanked by hard rock ridges shoaling up to 30 to 32 m in depth.
Near-bottom currents at CADS are generally less than 10 cm/sec and northerly in direction, while near-surface currents are dominated by a southerly net drift moving at rates less than 15 cm/sec (SAIC, 1987). Although there is unlimited fetch to the northeast, near-surface currents have little effect on bottom currents due to the highly variable topography of the area which disrupts the coherence of near-bottom currents. As an alternative dredged material disposal site selected by the Corps of Engineers in 1985 (and not a formally designated site by the USEPA), CADS was closed in 2010 when its temporary status ended. Congressional legislation reopened the site in 2014 for a period of 5 years or until the completion of an environmental impact statement (EIS) designating an alternative dredged material disposal site for southern Maine. This legislation also prohibits the Site from being used for the disposal of more than 80,000 yd3 from any single dredging project.