The Marathon Battery site is a former battery manufacturing plant in Cold Spring, Putnam County, New York. The site is composed of three study areas: Area I, which consists of East Foundry Cove Marsh and Constitution Marsh; Area II, which encompasses the former plant, presently a book storage warehouse, the surrounding grounds, and a vault with cadmium contaminated sediment dredged from East Foundry Cove; and Area III, which includes East Foundry Cove (48 acres), West Foundry Cove and the Hudson River in the vicinity of Cold Spring pier and a sewer outfall. Contamination in Area III emanates from plant wastewater that was discharged via the city sewer system into the Hudson River at Cold Spring Pier or, in some instances, through a storm sewer into East Foundry Cove. A Record of Decision (ROD) was signed for Area I in September 1986 with cleanup activities to include dredging the East Foundry Cove Marsh. The second ROD for the site was signed in September 1988 and included decontamination of the battery plant and soil excavation in Area II. The 1989 ROD represents the third and final operable unit for the site and addresses sediment contamination in Area III. The primary contaminants of concern affecting sediment at the site are metals including cadmium and nickel.