Record of Decision System (RODS)
HI-MILL MANUFACTURING CO.
|Site Name:||HI-MILL MANUFACTURING CO.|
|Address:||1704 HIGHLAND RD|
|City & State:||HIGHLAND MI 48356|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
|Abstract:||The 4.5-acre Hi-Mill Manufacturing site is an active manufacturing plant located in Highland Township, Oakland County, Michigan. The site contains a manufacturing facility that makes aluminum, brass, and copper tubing parts and fittings and a paved parking area. In addition, the site borders Highland Road and Highland State Recreation Area, which includes Waterbury Lake approximately 1,000 feet to the south, Target Pond (a 10-acre marsh land) to the east, and wetlands areas to the west and south. Land use in the area is predominantly industrial, with the nearest residences located approximately 2,000 feet from the site. The Hi-Mill operations began in 1946 and consisted of two main processes; anodizing and degreasing metals. As part of plant operations, onsite tanks containing acids were used for metal baths. Periodically, these tanks were emptied of the process wastewater, which contained residues of acids and metals, including copper, aluminum, chromium, and zinc. From 1946 to 1979, this wastewater was discharged onsite into a clay-lined lagoon. In 1972, site investigations documented elevated levels of metals in Target Pond and onsite production wells. In 1976, Hi-Mill built a second, smaller lagoon to receive overflow from the original lagoon. On two occasions, in 1976 and 1977, the larger lagoon overflowed into the marsh bordering the site. As a result, the State required Hi-Mill to stop discharging untreated wastewater into the lagoon and requested that the company design a wastewater recycling program, which was later implemented in 1981. Between 1978 and 1980, onsite construction activities resulted in damage to a solvent delivery line between the storage tank and degreaser. The major source of onsite contamination is believed to be the result of this past accidental release of approximately 250 gallons of chlorinated solvents from the underground piping on the north side of the facility. In 1983 under State supervision, Hi-Mill removed 142 yd of contaminated soil, 34,400 gallons of contaminated sludge, and 63,300 gallons of contaminated wastewater offsite, and backfilled the lagoon. In 1988, after State investigations concluded that the drinking water was still contaminated, the two onsite production wells were abandoned, and bottled water was provided to Hi-Mill employees. This ROD addresses the final remedy for contaminated ground water. The primary contaminants of concern affecting the ground water are VOCs, including TCE, 1,2-DCE, any vinyl chloride. SELECTED REMEDIAL ACTION: The selected remedial action for this site includes monitoring ground water for 30 years; re-evaluating the monitoring system, if results indicate that organic contamination is migrating toward surface water at concentrations potentially exceeding the more stringent of Federal and State standards; and implementing institutional controls, including deed restrictions. The estimated present worth cost for this remedial action is $565,000, which includes an annual O&M cost of $88,000 for years 0-3 and $23,000 for years 4-30. PERFORMANCE STANDARDS OR GOALS: Not provided. INSTITUTIONAL CONTROLS: Institutional controls will be implemented in the form of deed restrictions to restrict development of the property for residential use, thus eliminating the need to consider exposure risks to future residents.|
|Remedy:||U.S. EPA has selected a "No Action with Groundwater Monitoring and Institutional Controls". The remedy selected for groundwater contamination includes continued monitoring of both the shallow groundwater unit and the intermediate aquifer. In addition, the monitoring network will be designed to detect impacts to nearby surface water bodies. The selected remedy also incorporates institutional controls to prohibit future development of the Hi-Mill property for residential use. This remedy addresses the threat posed by contaminated groundwater by eliminating or reducing the risks posed by the site through groundwater monitoring and institutional controls. U.S. EPA has determined that no remedial action is necessary at the site. As this is a decision for "No Action", the statutory requirements of CERCLA Section 121 for remedial actions are not applicable and no statutory five-year review will be undertaken.|
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