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Fact Sheet
May 2006
Comment Period for Engineering Evaluation/Cost Analysis - Union Electric Campbell Substation Superfund Site, St. Louis, Missouri
INTRODUCTION
EPA Region 7 requests comments on an Engineering Evaluation/Cost Analysis (EE/CA) and EPA’s proposed response action to address contamination at the Union Electric Campbell Substation Superfund Site, St. Louis, Missouri. The public comment period runs from May 15 to June 13, 2006.
The EE/CA evaluated four alternatives to address contamination and eliminate direct contact to surface soils and exposed refuse at the site. EPA recommends Alternative 2 as the most appropriate approach for the site. Further details about Alternative 2 are provided below.
SITE BACKGROUND
The Campbell Substation covers 10.6 acres in an industrial area located at the 6500 block of Hall Street in St. Louis. A landfill operated in this area from 1955 to 1967. Union Electric Company (now known as AmerenUE) constructed the electrical substation in 1976. AmerenUE employees and contractors visit the site for limited periods to monitor and maintain substation equipment or gather equipment for off-site service repair.
In 1981, following the passage of the Compensation Environmental Response, and Liability Act (CERCLA), Union Electric Company provided EPA with information regarding possible contamination at the site. Following receipt of this information, EPA assessed the site, and in 1984 and 1987, collected groundwater and soil samples from the site to determine the extent of contamination. Sampling results documented: 1) low levels of volatile organic contaminants (VOCs) in groundwater; 2) polychlorinated biphenyl (PCB) contamination in the south drainage ditch and eastern surface soils; and 3) lead and polycyclic aromatic hydrocarbon (PAH) contamination in soils.
In 2003, Union Electric Company signed an administrative order with EPA in which the company agreed to complete an EE/CA at the site. The purpose of the EE/CA was to investigate potential hazards associated with both the original landfill and the substation and propose response actions to address the contamination.
PROPOSED ALTERNATIVES
Based on site conditions and risk evaluation, four alternatives were evaluated in the EE/CA. All alternatives except for the “no action” alternative included the following components:
- Placement of an approved stabilization/ erosion control material, such as a geotextile liner, in areas along the offsite drainage ditch where erosion has caused exposure of landfill refuse.
- Institutional controls to restrict future residential use and to ensure notification of construction/utility workers.
- Periodic monitoring of methane in monitoring wells and inside existing buildings.
PREFERRED ALTERNATIVE
EPA is recommending implementation of Alternative 2 which includes the following components:
- The installation of a perimeter fence which will significantly reduce exposure by limiting access to the entire site.
- Placement of a geotextile liner, rip-rap, cover soil or other approved stabilization materials along the offsite drainage ditch to control erosion.
- Establishment of institutional controls to restrict residential use at the site.
- Notification of construction/utility workers prior to site access and implementation of a health and safety plan; and
- Periodic monitoring of methane in monitoring wells and inside existing buildings.
Alternative 2 will be effective for permanent, long-term protection of public health and the environment.
ADMINISTRATIVE RECORD
EPA has established an Administrative Record for the site. The Administrative Record, which includes the EE/CA and other relevant site documents, is available for review and comment at the following locations:
St. Louis Public Library
Government Documents
1301 Olive Street
St. Louis, Missouri
EPA Region 7
Records Center
901 North 5th Street
Kansas City, Kansas
The period for submitting comments on the Administrative Record will run concurrently with the comment period for the EE/CA from May 15 to June 13, 2006. EPA will prepare a written response to significant comments submitted during the comment period. The written response will be included in a responsiveness summary to be included in the Administrative Record.
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Public Comment Period
EPA is asking for your comments on the EE/CA and the Administrative Record for the Union Electric Substation Superfund Site, St. Louis, Missouri. The comment period runs from May 15 to June 13, 2006. Please send your comments to:
Dianna Whitaker
EPA Region 7
901 North 5th Street
Kansas City, Kansas 66101
Phone: 913-551-7003
Fax: 913-551-7066
E-mail: whitaker.dianna@epa.gov
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ADDITIONAL INFORMATION
EPA encourages members of the public to review and provide comments on the EE/CA and the entire Administrative Record. EPA will select a final response action after all comments have been received and considered. Written comments must be postmarked or mailed electronically no later than June 13, 2006, and should be directed to:
Dianna Whitaker
Community Involvement Coordinator
EPA Region 7
901 North 5th Street
Kansas City, Kansas 66101
913-551-7003, Toll-free 1-800-223-0425
E-mail: whitaker.dianna@epa.gov
