The Raritan Bay Slag Superfund Site (the Site) is located in the townships of Old Bridge and Sayreville, New Jersey. The Site encompasses wetlands, shoreline, a waterfront park and beaches, upland areas adjacent to the shore, and sediments in the near-shore side of the Raritan Bay. The Site is approximately 1.5 miles in length and consists of the waterfront area between Margaret's Creek and the area just beyond the western jetty at the Cheesequake Creek Inlet. Approximately 40 years ago, slag from a secondary lead smelter was used at the Site to construct the seawall along Raritan Bay and to augment an existing jetty on the western side of the Cheesequake Creek Inlet. The placement of the slag at the Site has resulted in the leaching of heavy metals, including lead, arsenic, antimony, copper and chromium into the surrounding Raritan Bay surface water, sediments and near shore soils. Additionally, as the saltwater weathers the slag, particles from the slag erode and mix into the sediments and soils at the Site. Lead is the primary contaminant of concern (COC) at the Site and is the COC driving the remedy. The slag appears to have come from a former secondary lead smelting facility in Perth Amboy, N.J. The Defendant (or a predecessor of the Defendant) owned and/or operated that facility when the slag was removed from its facility and placed at the Site.