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Arrowhead Refinery Company
The Arrowhead Refinery Superfund site is a 10-acre former waste oil recycling facility, located in Hermantown, Minnesota, within a white cedar wetland. The refining process generated a waste stream of highly acidic, metal-laden sludge which was disposed of in an unlined two-acre lagoon on the site and waste process water which was discharged into a wastewater ditch in a wetland area. Arrowhead Refining Company incorporated in 1961 and continued the re-refining activities until 1977. A public health risk assessment stated that if no action was taken to remedy the site, use or development of the site would result in unacceptable health effects on user populations. It was also determined that there was a future potential exposure risk for offsite drinking water wells across the road from the site and in the pathway of the contaminated groundwater plume. The record of decision (ROD) was issued in September 1986.
==Threats and contaminants==
Site investigations that began in May 1984 found volatile organic compounds (VOCs), polynuclear aromatic hydrocarbons (PNAs), carcinogenic PNAs, petroleum hydrocarbons, and metals in the source material, soils, and sediments. In addition, the pH of the sludge was found to be between one and two.
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