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Henry's Knob General Chemical

National Information
Additional Resources
Site Summary Profile
EPA ID: SCD000407376
Location: Clover, York County, SC
Lat/Long: 35.111182, -081.226583
Congressional District: 05
NPL Status: Superfund Alternative Approach
Affected Media: Ground water, Sediment, Soil, Surface Water
Cleanup Status: Remedial Investigation/Feasibility Study Underway
Human Exposure Under Control: NA
Groundwater Migration Under Control: NA
Sitewide Ready for Anticipated Use: NA
Site Reuse/Redevelopment: Privately-owned property
Site Manager: Beverly Stepter (stepter.beverly@epa.gov )


Current Site Status

The Henry’s Knob site includes the area where a mine operated from 1947 to 1970. EPA did not list the site on the National Priorities List (NPL) but considers it an NPL-caliber site and is addressing it through the Superfund Alternative Approach. EPA, the South Carolina Department of Health and Environmental Control (SCDHEC), and Combustion Engineering and ABB Inc., the site’s primary potentially responsible parties (PRPs), have investigated site conditions and taken steps to clean up the site in order to protect people and the environment from contamination. By conducting site investigations and studies, EPA, SCDHEC and the site’s PRPs continue to protect people and the environment from site contamination.

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Site Location and Background

The 185-acre site is located at the corner of Henry’s Knob Road and State Highway 55 in Clover, York County, South Carolina. The site includes the following areas on 10 residential and commercial properties located around this intersection:

Land uses in the area near the site include include residential and commercial. Residential areas include low-income and minority residents.

From 1947 to 1970, a mine operated at the site. Open pit mining operations left tailings ponds and waste rock areas and resulted in 10 source areas of contamination at the site. In 1974, York County acquired the site and used the area as a park. In 1982, York County sold the site to various private owners for residential and commercial uses. EPA did not list the site on the NPL but considers it an NPL-caliber site and is addressing it through the Superfund Alternative Approach. Residential and commercial land uses remain on site.

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Threats and Contaminants

Site investigations found contamination in ground water, sediment, soil and surface water that could potentially harm people in the area. Contamination resulted from operations and waste handling practices at the site. Sampling found elevated levels of arsenic, manganese, cadmium, lead, chromium, copper, cobalt, magnesium, nickel, barium and zinc. The primary contaminant of concern  is manganese.

Contamination affected soil, sediment and surface water in the South Fork of Crowdis Creek. EPA considers these affected areas a threat to people and the environment. The site’s PRPs are investigating these areas as part of the site’s risk assessment.

Contamination also affected ground water at the site. EPA considers contaminated ground water and surface water primary threats to people and the environment. The PRPs provided bottled water to affected residents.

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Investigation and Cleanup Responsibility / Oversight

Combustion Engineering and ABB Inc., the site’s PRPs, lead site investigation and cleanup activities, with oversight provided by EPA and SCDHEC.

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Site Cleanup Plan

The site’s PRPs are conducting a remedial investigation/feasibility study (RI/FS) for the site. Based on the results of the RI/FS, EPA will issue a proposed cleanup plan to address contamination and related risk to people and the environment. After receiving input from SCDHEC and the community, EPA will issue the final cleanup plan (a Record of Decision, or ROD).

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Cleanup Progress

In 2000, the site’s PRPs conducted ground water, sediment, soil and surface water sampling at the site.

In 2004, the PRPs prepared the RI/FS work plan for the site. EPA and SCDHEC approved the work plan in 2005 and the PRPs began the RI/FS.

In 2006, the PRPs completed comprehensive sampling of soils, tailings, sediments and surface water. 

In 2007, the PRPs prepared the second phase of the RI/FS, residential and ground water monitoring at the site. EPA recommended that the PRPs provide affected residences with bottled water. The PRPs provided bottled water to six residential properties with contaminated wells.

The PRPs completed RI activities in 2010.

In 2011, the PRPs began evaluating short-term cleanup and response activities. EPA anticipates that the PRPs will complete the evaluations in 2012.

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Enforcement Activities

EPA negotiated legal agreements with the site’s PRPs to investigate and clean up the site. The PRPs continue to fund site cleanup, monitoring and oversight activities.

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Community Involvement

EPA is working with the community and its state partner to develop a long-term cleanup plan for the site, reflecting the Agency’s commitment to safe, healthy communities and environmental protection. Community engagement and public outreach are core components of EPA program activities.

EPA is conducting a range of community involvement activities to solicit community input and to make sure the public remains informed about site activities throughout the cleanup process. Outreach efforts include public notices, interviews and public meetings.

EPA conducted site interviews and held a public meeting to address community concerns in 2008. 

In 2012, following the PRPs’ evaluations of short-term cleanup activities, EPA will provide fact sheets and meet with the community to discuss the proposed activities.

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Future Work

The site’s PRPs are evaluating short-term cleanup and response activities. Following the evaluations, EPA will meet with the community to discuss the proposed activities and will provide fact sheets.

The PRPs are working on the FS for the site. Following the completion of RI/FS, EPA will issue a cleanup plan (a ROD) for the site.

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Additional Information

EPA keeps additional site documents and information in a site information repository at the location below. EPA also posts site documents, when available, on EPA’s CERCLIS Site Profile page. For documents not available on the website, please contact the Region 4 Freedom of Information Office.

Site Repository

Clover Branch Library
107 Knox Street
Clover, SC 29710

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