Highway 100 and County Road 3 groundwater plume site

This site is located in the cities of St. Louis Park and Edina in an area generally bounded by W. 33rd Street to the north, S. France Avenue to the east, W. 58th Street to the south, and Blake Road to the west. The area has been investigated since 2004. The cities of Edina and St. Louis Park have both installed treatment systems to ensure area residents have safe drinking water.

The Highway 100 and County Road 3 groundwater plume site contamination consists of volatile organic compounds (VOC) including tetrachloroethylene (PCE), trichloroethylene (TCE), cis dichloroethylene (DCE) and vinyl chloride (VC), collectively known as chlorinated VOCs. PCE is an industrial solvent used to degrease metals. 

Impacts have been identified in two St. Louis Park municipal wells, and four Edina municipal wells. Concentrations in one Edina well exceeded both Minnesota Department of Health (MDH) health-based guidance values and EPA safe drinking water criteria. Concentrations of pollutants detected in all other wells have exceeded the MDH health-based water guidance values. While treatment has previously been installed on the drinking water wells to ensure safe drinking water to the communities’ residents, it is a high priority to continue investigations and remediation of the associated groundwater contamination plume to protect human health and the environment.

Map of Highway 100 and County Road 3 groundwater plume site

NPL listing request

On August 21, 2019, the MPCA asked the U.S. Environmental Protection Agency (EPA) to place the site on its National Priorities List to access additional funding needed to investigate and clean up the contaminated area, including a deep groundwater contamination plume that underlies a large portion of both cities. The MPCA believes that the site is eligible for listing on the NPL due to the impact of the municipal water supplies. The state dedicated significant funds and staffing to define the area to date; however, there is still more work to be done. 

Highway 100 and County Road 3 groundwater contaminant plume

3D graphic showing deep groundwater plume

The amount of funding required to identify the source area, pursue potentially responsible parties, and implement a cleanup plan far surpasses the amount of funding the state’s Superfund Program receives each year. Funding support from the federal government will assist with additional investigation activities and bring in additional technical expertise and specialized legal counsel to effectively address the complexities of the site in a timely manner. If a potentially responsible party(ies) can be identified, cost recovery efforts can be pursued.

Should the site be listed on the NPL, the MPCA will continue to assist the EPA in making the necessary decisions to protect public health and the environment in cities of Edina and St. Louis Park. 

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