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EPA in Missouri

Sporlan Valve Plant #1 Superfund Site

Site Background

The site is located at 611 E. 7th Street, Washington, Franklin County, Missouri. See Page 2 for an illustration of the site location.

The site was first developed as a refrigeration valve manufacturing facility in 1939. Trichloroethylene (TCE) was used at the facility as a degreaser and industrial solvent. A release of TCE to the ground has occurred, potentially over several decades, resulting in contaminated soil and groundwater beneath the facility. TCE has been detected in groundwater, soil gas, and indoor air surrounding the site.

TCE is the primary contaminant of concern at the site. Exposure to TCE poses potential human health hazards to the central nervous system, kidney, liver, immune system, male reproductive system, and developing fetus. TCE is characterized by EPA as “carcinogenic in humans” by all routes of exposure. Other contaminants of concern at this site include vinyl chloride and dichloroethene, both of which are breakdown byproducts of the degradation of TCE in the environment.

Vapor Intrusion

A series of actions have been taken to mitigate the threat of vapor intrusion (VI) due to the presence of TCE in shallow groundwater under residential properties adjacent to the site. These actions have included sampling for TCE in homes, installing, and requiring the potentially responsible party to install vapor mitigation systems, like the one shown in Figure 1.

Vapor intrusion is a process by which volatile chemicals in soil and groundwater can migrate into and accumulate inside buildings. Vapor mitigation systems reduce concentrations of airborne contamination, so they do not pose health risks. At this time, EPA has installed and overseen installation of 19 vapor mitigation systems at homes adjacent to the site. 

Proposed NPL Listing

EPA is currently considering proposing the site for listing on the National Priorities List (NPL), which is the agency's list of sites of national priority among the known contaminated sites throughout the U.S. and its territories. Listing the site on the NPL can be an effective way to address soil and groundwater contamination, and will allow EPA to further investigate soil and groundwater at the site and remediate, if warranted.

Site Documents

Additional documents regarding the PRP-lead work are available at
Additional documents regarding the fund-lead work are available at
The Administrative Record for the site is available online at

For Additional TCE and Vapor Intrusion InformationFigure showing vapor intrusion into a homeFIGURE SHOWING VAPOR INSTRUSION INTO A HOME

For more information about TCE health risks, visit the CDC/ATSDR ToxFAQs:
For vapor intrusion (VI) information, visit EPA’s website:
EPA’s Citizen’s Guide to VI mitigation:

EPA Contact Information

If you have questions about this Fact Sheet, the Public Availability Session, would like to receive site updates, and/or need additional information, please contact EPA:

Elizabeth Kramer
Community Engagement Specialist
U.S. EPA Region 7
Phone: (913) 551-7186
Heath Smith
On-Scene Coordinator
U.S. EPA Region 7
Phone: (636) 326-4724