Superfund Site Profile

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The Unimatic Manufacturing Corporation Site (the Site) is located at 25 Sherwood Lane, Block 2301 and Lot 8, in an industrial and residential area of Fairfield, New Jersey. The Site covers approximately 1.23 acre and contains a centrally-located building on a partially paved parking lot. Unimatic constructed the building in 1955 to serve as a tool shop, and later for its die-casting operations. Adjoining properties include General Hose Products to the east, National Precision Tools Co. to the south, an office building to the west, and a buried water delivery pipeline for the Jersey City water system to the north. 

From 1955 until 2001, Unimatic operated an aluminum die casting manufacturing process at the Site. In the die casting process, aluminum alloy was heated to approximately 1,200 degrees Fahrenheit in natural gas powered kilns. The molten aluminum alloy was then injected into a closed vessel (known as a casting die or mold) under high pressure and at a controlled temperature. Prior to injection with the molten alloy, the heated mold was coated with a lubricating oil that contained polychlorinated biphenyls (PCBs). The PCB-contaminated lubricating oil was used to prevent aluminum from adhering to the molds. The spraying of these lubricants resulted in spillage and splatter throughout the interior of the building.

In addition, the facility discharged contaminated process water and cooling water through leaking wastewater pipes to a discharge point at the northeastern corner of the property. The wastewater pipes were poorly constructed allowing the contaminated wastewater to leak into the groundwater, soil, and sediment at the property.