hi-mill manufacturing co.

1704 HIGHLAND RD

The Hi-Mill Manufacturing Company (Hi-Mill) Superfund Site, 4.5 acres in size, is a former industrial site located in Highland Township, Oakland County, Michigan. Hi-Mill Manufacturing, the Potentially Responsible Party (PRP), began manufacturing tubular aluminum, brass, copper tubing, and other parts in 1946. From 1946 until the mid-1980s, process wastewater that contained residues of acids and heavy metals was periodically emptied into lagoons on the site. Prompted by complaints from Hi-Mill employees, the Michigan Department of Natural Resources (MDNR) sampled the two onsite production wells and an adjacent pond (referred to as “Target Pond”) in 1972. One well was contaminated with a volatile organic compound (VOC), and Target Pond was found to be contaminated with metals. Although the shallow groundwater beneath the Hi-Mill property and nearby areas is contaminated, it cannot be used as a drinking water source now or in the future due to its low water yield. The last time the intermediate aquifer, which is a drinking water source, showed a trace amount of trichloroethylene (TCE) was in a groundwater sample collected in April 1998. Since then, TCE has not been detected in any of the intermediate well samples. The nearest homes are approximately 2,000 feet southeast of the site. On February 21, 1990, the U.S. Environmental Protection Agency (EPA) placed the Hi-Mill site on the National Priorities List (NPL).

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