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U.S. EPA REGION 5
ANOKA COUNTY
ANDOVER

Congressional District # 06

WASTE DISPOSAL ENGINEERING

EPA ID# MND980609119
Last Updated: November, 2011

Site Description

The Waste Disposal Engineering Landfill Site is a 114-acre property located in the city of Andover (formerly Grow Township), in Anoka County, Minnesota, approximately 15 miles north of Minneapolis.  The site includes a 73 acre landfill which accepted approximately 2.5 million cubic yards of municipal, commercial, and industrial wastes.  The landfill operated as a dump and landfill from 1963 to 1983. Hazardous wastes were disposed of throughout the landfill during site operation. From 1972 until 1974, paint sludges, solvents, oils, caustics, and acids were disposed of in an asphalt-lined pit on the site. Poor operating practices and spills contributed to the site contamination. In 1982, lime sludge, generated by the Minneapolis Drinking Water Treatment Plant, was deposited at the site. The area surrounding the site is residential, agricultural, and commercial.  Area residents rely on groundwater for their drinking water source. The site is bordered by Coon Creek, which discharges into the Mississippi River approximately 11 river miles downstream from the site.

The site was deleleted from the National Priorities List following cleanup.

Site Responsibility

The site was addressed through federal, state, and potentially responsible parties' actions.  The site is currently managed by the Minnesota Pollution Control Agency as part of its Closed Landfill Program.

Threats and Contaminants

Groundwater directly under the site is contaminated primarily with volatile organic compounds (VOCs). Groundwater, soil gas, and Coon Creek contain VOCs from wastes deposited in the landfill. Prior to cleanup, individuals may be exposed to contaminants through accidental ingestion of, inhalation of, or direct contact with groundwater, soil gas, or surface water. 

Cleanup Progress

In 1974, prior to listing on the National Priorities List (NPL), MPCA ordered an on-site Hazardous Waste Pit to be closed due to the high potential for groundwater contamination.  The site was placed on the NPL in 1983. In 1984, EPA and MPCA entered into Consent Order with potentially responsible parties to complete a remedial investigation and feasibility study. The study was completed in 1987. 

In 1987, EPA selected a remedy that required: pumping and treating the groundwater using carbon absorption and discharging the treated water to Coon Creek; installing a soil cap to completely cover the landfill; installing a clay groundwater cut-off wall; implementing restrictions on groundwater use; filling in a wetland and constructing an alternate wetland to replace the lost habitat; and monitoring of the site.  A number of upgrade modifications were subsequently implemented, including: installation of a compacted clay barrier layer and geosynthetic clay liner; use of aeration treatment for extracted groundwater; discharge of treated groundwater to the Metropolitan Council of Environmental Services rather than to Coon Creek; and active gas extraction from the landfill. 

Construction of the final site remedy was completed in 1995.  At that time, the site was entered into MPCA's Closed Landfill Program for post-closure management and was deleted from the NPL in 1996.

Currently, MPCA performs operation and maintenance of the landfill gas, flare, groundwater extraction/treatment system, and landfill cover.  Contaminated groundwater is extracted by a series of 10 wells and pumped to an on-site retension basin for treatment.  Groundwater that is within acceptable drinking water standards is re-directed to an on-site infiltration basin.  Groundwater that contains contaminants which exceeds drinking water standards is treated by aeration until discharge standards are met for the public wastewater treatment system.  The landfill does not have a separate leachate collection system.  Operation of the groundwater pump and treat system will continue until established cleanup levels are met. 

Construction of all site remedies is complete.  Capping the landfill, installing a groundwater cutoff wall, replacing lost wetlands, and establishing a new habitat have reduced threats at the Waste Disposal Engineering site.  EPA continues to perform five-year reviews for this site.  The latest review, in 2008, confirmed that the site remedy is protective of human health and the environment. 

Property Reuse

MPCA has installed a Landfill-Gas-to-Energy project at the landfill to make use of the approximately 1.5 million pounds of methane collected by the landfill gas collection system each year.  MPCA is exploring development of this as a renewable energy source.

Contacts

Remedial Project Manager, U.S. EPA
leah evison (evison.leah@epa.gov)
(312) 886-2064

Community Involvement Coordinator, U.S. EPA
cheryl allen
(312) 353-6196

Aliases

WASTE DSPL ENGINEERING INC

 

Site Profile Information

This profile provides you with information on EPA's cleanup progress at this Superfund site.

 


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