Superfund Information Systems: Site Profile

Superfund Site:

BANDERA ROAD GROUND WATER PLUME
SAN ANTONIO, TX

Cleanup Activities

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Background

The Bandera Road Ground Water Plume site is located in Leon Valley, Texas. The site includes an area of groundwater contamination in the Edwards Aquifer that is about one mile long and a half-mile wide. Contamination has affected groundwater. Investigations have identified contamination in 14 wells. The well most affected is an Austin Chalk monitoring well. It is affected by contamination from a former dry cleaning facility. Cleanup activities and well sampling are ongoing.

Current Status
The Bandera Road Ground Water Plume Superfund Site Record of Decision (ROD) was issued on September 30, 2013, and selected the Preferred Alternative identified in the Proposed Plan to address contaminated vapor, soil and ground water at the Site. The final ROD was based on information presented in the Remedial Investigation/Feasibility Study and considered input on the Proposed Plan provided during the public comment period (July 18, 2011 – October 15, 2011). The Texas Commission on Environmental Quality (TCEQ) provided their input and concurrence on the Proposed Plan and ROD.
 
Enforcement: The EPA is proceeding to negotiation of the design and implementation of the remedy selected by the 2013 ROD. Special Notice Letters have been issued to Potentially Responsible Parties (PRPs) to inform them of potential liability for contamination at the Site. Informational meetings have taken place between EPA and PRPs in advance of Remedial Design/Remedial Action (RD/RA) Consent Decree negotiations.

Background
The Bandera Road Ground Water Plume Superfund Site (Site) is located in the City of Leon Valley, Bexar County, Texas. The Site encompasses as area of approximately 1 mile long by ½ mile wide. The site was identified as a result of assessment activities conducted pursuant to the Texas Commission on Environmental Quality Voluntary Clean-up Program. The investigation identified the presence of tetrachloroethene (PCE) and trichloroethene (TCE) in concentrations above the Maximum Contaminant Level within the Edwards Aquifer. The Maximum Contaminant Level for both is 5 parts per billion. The Edwards Aquifer is the sole-source drinking water aquifer for central Texas.

Site Description
The Site is centered in a business area, with some homes nearby, between Poss Road and Grissom Road, southwest of Bandera Road. Ongoing sampling and the investigation may affect the estimated plume extent. Two City of Leon Valley public water supply wells are within one mile of the center of the contamination plume. These two public water supply wells are routinely sampled by EPA to ensure public safety.
Wastes and Volumes

The site is being evaluated as a ground water plume containing PCE, TCE and cis-1,2-dichloroethene (cis-1,2-DCE). To date, fourteen wells were found to be contaminated with PCE and/or TCE at or above the 5.0 parts per billion. Three of these wells were Edwards Aquifer wells which have been plugged and abandoned. An additional well which was located at an automotive repair facility was also plugged and abandoned.

The most impacted well is an Austin Chalk monitoring well located by a former dry cleaning facility in which PCE concentrations as high as 11,700 ppb have been detected.

National Priorities Listing (NPL) History
NPL Inclusion Proposal Date: September 26, 2006
NPL Inclusion Final Date: March 7, 2007 

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What Has Been Done to Clean Up the Site?

The site is being addressed through federal, state and potentially responsible party (PRP) actions.

 

The site was identified as a result of assessment activities conducted pursuant to the Texas Commission on Environmental Quality’s Voluntary Cleanup Program. The investigation identified the presence of PCE and TCE contamination in the Edwards Aquifer. The Edwards Aquifer is the sole-source drinking water aquifer for central Texas.

The site is centered in a business area, with some homes nearby, between Poss Road and Grissom Road, southwest of Bandera Road. Ongoing sampling and the investigation may affect the estimated plume extent. Two City of Leon Valley public water supply wells are located within a mile of the center of the contamination plume. These two public water supply wells are routinely sampled by EPA to ensure public safety.

The site was identified as a result of assessment activities conducted pursuant to the Texas Commission on Environmental Quality’s Voluntary Cleanup Program. The investigation identified the presence of PCE and TCE contamination in the Edwards Aquifer. The Edwards Aquifer is the sole-source drinking water aquifer for central Texas.

The site is centered in a business area, with some homes nearby, between Poss Road and Grissom Road, southwest of Bandera Road. Ongoing sampling and the investigation may affect the estimated plume extent. Two City of Leon Valley public water supply wells are located within a mile of the center of the contamination plume. These two public water supply wells are routinely sampled by EPA to ensure public safety.

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What Is the Current Site Status?

The site’s long-term remedy, selected in 2013, includes in-place bioremediation of contaminated groundwater, plugging and abandonment of improperly constructed or deteriorating wells, soil vapor extraction, placement of membrane and sealant with a vapor vent to address indoor air contamination in the former dry cleaner, institutional controls, fencing and signage, and monitoring of air, soil gas and groundwater. Cleanup activities and well sampling are ongoing.

EPA is working with the Edwards Aquifer Authority (EAA) to identify locations of former wells.

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Activity and Use Limitations

At this site, activity and use limitations that EPA calls institutional controls are in place. Institutional controls play an important role in site remedies because they reduce exposure to contamination by limiting land or resource use. They also guide human behavior. For instance, zoning restrictions prevent land uses – such as residential uses – that are not consistent with the level of cleanup.

For more background, see Institutional Controls.

State Contact (TCEQ): Marilyn Long, 512-239-0761, Marilyn.Long@tceq.texas.gov

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