BANDERA ROAD GROUND WATER PLUME
SAN ANTONIO, TX
On this page:
On related pages:
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 Site is centered in a business area, with some homes nearby, between Poss Road and Grissom Road, southwest of Bandera Road. 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.
The site is a ground water plume containing PCE, TCE and cis-1,2-dichloroethene (cis-1,2-DCE). 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
What Has Been Done to Clean Up the Site?
Human exposure to contaminated ground water is prevented by providing access to city public water for residences whose wells were found to be contaminated with PCE/TCE above the Federal drinking water standards.
Groundwater sampling is continuing to ensure that the plumes are stable and additional wells are not being impacted.
Vapor mitigation efforts have been taken to address vapor intrusion in the area around a former dry cleaning facility.
What Is the Current Site Status?
Currently, EPA is in the Remedial Design phase which includes field testing components of the site’s long-term remedy ( in-place bioremediation of contaminated groundwater, 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).
EPA is also working with the Edwards Aquifer Authority (EAA) to plug and abandon improperly constructed or deteriorating wells, which may serve as a migration conduit for the plume contamination.