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State Highway 123 PCE Plume

A groundwater plume, from an unknown source at this site in Hays County contains chlorinated solvents and associated breakdown products.

Site Summary

The site is near the intersection of State Highway 123 and Interstate Highway 35 in San Marcos, Hays County. A plume of contaminated groundwater originates in the area of west State Highway 123 near Ebony Street. Groundwater flows generally north to northeast and emerges through a seep near Willow Springs Creek.

The plume was first discovered in 1986 during investigations related to removing an underground petroleum storage tank in the vicinity.

Superfund Registry and Investigation

The TCEQ proposed the site to the state Superfund registry in 2001 and conducted a remedial investigation from 2001-2004. The investigation identified tetrachloroethene (PCE) and PCE-related chemicals at levels exceeding the protective concentration limits.

Remedial Action

In 2005, the TCEQ issued an administrative order listing the site on the state Superfund registry. The remedial action involved establishing a plume management zone, monitoring for natural attenuation, and institutional controls on affected properties to prevent future exposure to the chemicals of concern.

Current Status

The site is currently in the operations and maintenance  phase of the Superfund program. The TCEQ continues to routinely monitor the groundwater within the plume management zone and at the seep to make sure the selected remedy remains effective.

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Site Specific Information

Type of Facility: Groundwater plume
Location: San Marcos, Hays County
Latitude: 29.869003°
Longitude: -97.935503°

Site Phase: Cleanup Complete O and M
State Superfund Registry Status: Listed on registry
Media Affected: Groundwater
TCEQ Region: Austin - 11
Funded by: Hazardous & Solid Waste
Remediation Fee Account

Contact Information
Superfund Project Manager
Adrienne Love
512-239-2273 or 1-800-633-9363

Superfund Community Relations Liaison
John Flores
512-239-5674 or 1-800-633-9363

Records Repositories
San Marcos Public Library
625 E. Hopkins Street
San Marcos TX 78666

TCEQ Central File Room
12100 Park 35 Circle Building E,
First Floor Room 103
Austin, TX 78753
512-239-1850 (fax)