OAK GROVE TOWNSHIP
Congressional District # 06
OAK GROVE SANITARY LANDFILLEPA ID# MND980904056
Last Updated: March, 2015
The Oak Grove Sanitary Landfill Site is located in the City of Oak Grove, Anoka County, Minnesota, near the intersection of Edelweiss Street NW and County Road 22 (Viking Boulevard). The landfill covers approximately 52 acres of a 104-acre property and contains approximately 2,700,000 cubic yards of waste. The landfill began operation as an open dump in 1967 and landfill operations ceased in 1984. Most of the waste in the landfill was commercial and municipal solid waste. However, industrial solid waste and liquid waste, some of which may be hazardous, was also present in the landfill. These wastes included various sludges and acids, paint and solvent wastes, foundry sands and sludges, pesticide manufacturing wastes, and inks. In 1985, lime sludge was used as a cover for part of the landfill.
Groundwater beneath the landfill flows from north to south and is present in a shallow aquifer and a deeper aquifer known as the Valley Train Aquifer, which is a source of drinking water for area residents. A creek flows through the site and discharges through a wetland to the Rum River two miles from the site. Residences are located immediately adjacent to the landfill property to the west.
Site ResponsibilityThis site is being addressed through State actions. The property is owned by the State of Minnesota and is maintained and monitored by the Minnesota Pollution Control Agency's (MPCA's) Closed Landfill Program.
Threats and ContaminantsPrior to cleanup, many organic and inorganic contaminants were detected in shallow groundwater, including vinyl chloride, 1,2-dichloroethane, benzene, arsenic and nickel at concentrations above drinking water standards. Leachate samples from the landfill also contained a variety of organic contaminants.
In 1988, MPCA and the United States Environmental Protection Agency (EPA) selected a remedy for the landfill which included installation of a new multi-layer cap, deed restrictions to restrict uses of the property to those that are protective of human health, and groundwater monitoring. In 1990, MPCA and EPA selected a remedy for groundwater which included monitoring of natural attenuation and institutional controls to prevent people from drinking contaminated water.
Construction of the remedies began in 1992, and construction was completed in 1993. In 1994, the site was entered into MPCA's Closed Landfill Program and the site was subsequently deleted from the National Priorities List (NPL). MPCA continues to upgrade the landfill remedy as needed, including the 2003 installation of a new landfill gas extraction system with an enclosed flare.
The most recent five year review for the site, conducted in 2012 by EPA, confirmed that the remedy remains protective of human health and the environment. Groundwater continues to improve and arsenic, manganese, benzene and nickel only sporadically exceed drinking water standards in shallow groundwater on the landfill property. Twenty gas monitoring probes surrounding the landfill are sampled quarterly for methane gas, and they demonstrate that landfill gas is not migrating away from the landfill.
ContactsRemedial Project Manager, U.S. EPA
leah evison (firstname.lastname@example.org)
Community Involvement Coordinator, U.S. EPA
AliasesOAK GROVE SANITARY LDFL