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Fact Sheet

May 2012

EPA Announces New Sampling for the Valley Park TCE Superfund Site, Valley Park, St. Louis County, Missouri


The Valley Park TCE Site (site) is located in the city of Valley Park, Missouri, which is in St. Louis County approximately 15 miles southwest of the city of St. Louis. Valley Park is located in the Meramec River Valley and consists primarily of residential, commercial and industrial buildings with a population of 6,942 (2010 Census). The site consists of two contaminant source areas and an area-wide groundwater plume.


EPA and the Missouri Department of Natural Resources (MDNR) conduct regular reviews on Superfund sites where cleanups have been completed. These reviews are required by the Superfund law [42 U.S.C. Section 9621(c)]. On September 19, 2008, the agencies completed the second five-year review (FYR) for the site.

In the 2008 FYR, the agencies identified the need to perform vapor intrusion sampling to ensure that the remedy at the site remains protective of human health and the environment.

In accordance with the findings of the FYR, EPA is now conducting vapor intrusion sampling on residential properties adjacent to the site.


In 1982, MDNR detected volatile organic compounds (VOCs), including tetrachloroethene (PCE), trichloroethene (TCE) and 1,1,1-trichloroethane (TCA), in samples collected from three Valley Park municipal wells. In response to the contamination, the city of Valley Park installed equipment to remove VOCs from drinking water. Since 1988, Valley Park residents have been connected to the St. Louis County public water system.

EPA and MDNR determined that the sources of contamination originated from a former Wainwright Industries property and a current Valley Technologies, Inc. property located in Valley Park. Wainwright and Valley Technologies both used chlorinated degreasers and solvents for cleaning purposes.

The site has been managed as two separate source areas.

Operable Units 1 and 3 (OU1 and OU3) are the groundwater and soil cleanups at the former Wainwright source area.

Operable Unit 2 (OU2) involves the cleanup of the soil and groundwater at the Valley Technologies source area.

The site was placed on the National Priorities List on June 10, 1986. Cleanup actions were defined in Records of Decision (RODs) for OU1 and OU3 in 1994, and for OU2 in 2001. Both RODs were modified as defined in 1996 and 2005 Explanation of Significant Differences documents. The remedies for both source areas included:

1) excavation of the most highly contaminated soils,
2) soil vapor extraction of soils contaminated at lower levels, and
3) extraction and treatment of contaminated groundwater.

The remedial actions for both RODs have been constructed and implemented. The operation and maintenance of the systems are ongoing.

Wainwright Industries is conducting the cleanup action at their former property following a consent decree with MDNR. EPA is conducting the cleanup action at the Valley Technologies property. Wainwright settled their respective liabilities with EPA through a consent decree of past costs and all future oversight costs for OU1 and OU3. Valley Technologies proved inability to pay costs.


EPA has compiled the site Administrative Record. The Administrative Record is the official record for the site and contains site reports and descriptions of activities and other documents used to determine the appropriate actions to take at the site. The Administrative Record is available for review during normal business hours at the following locations:

Valley Park Public Library
320 Benton St.
Valley Park, Mo.

EPA Records Center
901 N. Fifth St.
Kansas City, Kan.


Questions or requests for information can be submitted to:

Ben Washburn
Community Involvement Coordinator
EPA Region 7
901 N. Fifth St.
Kansas City, KS 66101
Toll-free: (800) 223-0425
Email: washburn.ben@epa.gov

Hoai Tran
Remedial Project Manager
EPA Region 7
901 N. Fifth St.
Kansas City, KS 66101
Toll-free: (800) 223-0425
Email: tran.hoai@epa.gov

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