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Congressional District # 04


EPA ID# MND980609515
Last Updated: May, 2015

Site Description

The Oakdale Dump Superfund site is located in Oakdale, Minnesota, and is comprised of three non-contiguous properties that were utilized for dumping from the late 1940s until the 1950s.  The properties are named the Abresch, Brockman, and Eberle sites for their respective property owners at the time of disposal activities.  The Abresch site is the largest of the three properties at about 55 acres.  The Brockman site is located immediately southwest of the Abresch site and encompasses 5 acres.  The Eberle site is located roughly 2,500 feet north of the Abresch site and encompasses 2 acres.

The Minnesota Pollution Control Agency (MPCA) investigated the three properties in 1980.  Analysis of waste samples indicated that a variety of hazardous substances, particularly volatile organic compounds (VOCs), had been disposed in trenches at the Abresch and Brockman sites.  Soil sampling at the Eberle site revealed a small amount of heavy metal contaminants.

The U.S. Environmental Protection Agency (EPA) placed the Oakdale Dump site on the Superfund National Priorities List on September 8, 1983.

Site Responsibility

The Oakdale Dump site is being addressed through state, federal, and potentially responsible party (PRP) actions. The state has taken the primary lead for oversight of the project, and EPA is serving as the support agency.

Threats and Contaminants

A variety of hazardous substances, including volatile organic compounds (VOCs) such as isopropyl ether (IPE) and benzene, were disposed at the Abresch and Brockman sites. Soil sampling at the Eberle site revealed minimal heavy metals contamination. Analysis of residential well water revealed that nine shallow wells were contaminated with hazardous substances. 

Cleanup Progress

In September 1982, the Minnesota Mining and Manufacturing Company(3M) conducted excavation tests in the trenches at the Abresch site and buried drum stockpiles were identified.  3M commissioned a surface cleanup of wastes at the Abresch site beginning in the winter of 1983. During the excavation activities, a total of 11,500 cubic yards of waste material was removed including 4,200 empty drums, 8,700 empty 5-gallon pails, 4,660 cubic yards of contaminated soil, and 15 intact containers that were over-packed. Most of the waste, 11,800 tons, was transported to the 3M Chemolite incinerator in Cottage Grove, Minnesota, in accordance with a 1982 Consent Order. An additional 6,500 tons of excavated waste containing more than 50 parts per million (ppm) of polychlorinated biphenyls (PCBs) were transported to a hazardous waste landfill for disposal.  Excavated soils with low levels of contamination were treated on-site utilizing construction aeration pads. Approximately 173,000 gallons of contaminated water was collected during excavation activities and transported for treatment at the 3M Chemolite facility.

A Response Action Plan (RAP) was developed pursuant to a 1983 Consent Order (CO) and the RAP identified the selected remedy. The selected remedy was developed to address VOC contamination in the groundwater. The plan proposed the following:

• Reconstruction or abandonment of impacted multi-aquifer wells;
• Removal of all containers and barrels of hazardous waste that were identified through the geophysical survey;
• Removal and/or treatment of heavily contaminated soils in the Abresch and Brockman sites;
• Construction and operation of a shallow groundwater pump-out system;
• Establishment of a long-term monitoring well network that will detect changes in groundwater quality.

The 1983 CO and RAP have been adopted by MPCA, EPA, and 3M as decision documents to address VOC contamination.

Abandonment of multi-aquifer wells was completed in 1984. There had previously been 44 multi-aquifer wells identified within the groundwater plume. Of these 44 wells, 39 were abandoned, 3 were added to the monitoring well network, and 2 were found to be single aquifer wells completed within an unaffected aquifer. Wells were abandoned in accordance with the Minnesota Department of Health Water Well Construction Code.

Construction of the groundwater extraction system was completed in August 1985. The system initially consisted of 12 pumping wells within the glacial drift aquifer that discharged impacted groundwater to the sanitary sewer for treatment at the Metropolitan Wastewater Treatment Facility, a publicly owned treatment works facility operated by the Metropolitan Council Environmental Services.

A groundwater monitoring well network was established to monitor remedial action. The March 1985 Groundwater Monitoring Plan (GMP) describes the initial monitoring plan and has since been updated for operational improvements. The GMP and groundwater extraction system were updated in 2003 to optimize system performance. Changes were implemented based on previous data collected, previous performance, and trend analysis performed for specific monitoring and extraction wells. The 2003 changes to the groundwater extraction system included reducing the number of extraction wells from 12 to 7.  PW-7, PW-8 and PW-9 were converted from extraction wells to monitoring wells and PW-5 was abandoned. The decision to change the purpose of these wells or abandon them was based on well performance and existing operational redundancy.

EPA completed the first five-year review at the site in March 1993 and MPCA completed the second five-year review in March 1998. The third five-year review, completed by EPA in April 2004, found that the groundwater remedy was removing VOCs from the glacial drift and was controlling plume migration. In 2009, MPCA completed the fourth five-year review which found that the remedy is functioning as intended and is protective of human health and the environment in the short term. Long-term protectiveness will be ensured once institutional controls are in place.  In 2014, MPCA completed the fifth five-year review which found that the remedy continues to function as intended and that institutional controls were still needed. 

Property Reuse

No remedial action was determined to be necessary for the Eberle site in the RAP and the site has since been redeveloped as a city park.


Remedial Project Manager, U.S. EPA
erik hardin (hardin.erik@epa.gov)
(312) 886-2402

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




Site Profile Information

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


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