Cornell Dubilier Electronics, Inc. operated at the site from 1936 to 1962, manufacturing electronic parts and components, including capacitors. The company dumped material contaminated with polychlorinated biphenyls (PCBs) and other hazardous substances directly onto site soils during its operations. The site is currently known as Hamilton Industrial Park, and since, Cornell-Dubilier Electronics departure, has been occupied by numerous commercial businesses. EPA has detected PCBs in the ground water, soil, and in building interiors at the industrial park and at nearby residential, commercial and municipal properties. EPA also has detected PCBs in the surface water and sediments of the Bound Brook, which crosses the site's southeast corner. A pre-1991 investigation conducted by the New Jersey Department of Environmental Protection in the vicinity of the former CDE facility revealed significant ground water contamination consisting mainly of the volatile organic compounds, trichloroethylene and tetrachloroethylene. Due to widespread contamination, residential wells in the area were closed and residents hooked up to a city water supply.