The Arrowhead Refinery Superfund site is located in Hermantown, Minnesota. The site is a 10-acre former waste oil recycling
facility 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. The waste
process water was also 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.