Arlington Cleaners, Arlington, Texas

State Coalition for Remediation of Drycleaners Site Profiles

Description
Historical activity that resulted in contamination.

Based on the historical data provided, the subject property was undeveloped or used as farmland until 1979, when the current shopping center was constructed. The primary identified source area is a former drycleaner facility which operated on-site from 1982-1992.

Remediation Status: Site closed

Contaminants
Contaminants present and the highest amount detected in both soil and groundwater.

Contaminant	Media	Concentration (ppb)
cis-1,2-Dichloroethene	groundwater	7,300 ppb
cis-1,2-Dichloroethene	soil
Tetrachloroethene (PCE)	groundwater	11,228 ppb
Tetrachloroethene (PCE)	soil
Trichloroethene (TCE)	groundwater	7,300 ppb
Trichloroethene (TCE)	soil
Vinyl Chloride	groundwater	870 ppb

Site Hydrology

Deepest Significant Groundwater Contamination:		7ft bgs
Plume Size:
Average Depth to Groundwater:		7ft

Lithology and Subsurface Geology

medium to dark gray shale

Gradient: 0.046ft/ft

Pathways and DNAPL Presence

Groundwater

Sediments

Soil

DNAPL Present

Remediation Scenario

Cleanup Goals:		Levels were adjusted by a factor of 100 because groundwater was deemed unusable based on low yield: Cleanup goals for Groundwater: PCE - 500 µg/L TCE - 500 µg/L cis-1,2-DCE - 7,000 µg/L VC - 200 µg/L Cleanup goals for soil (soil leaching to groundwater pathway): PCE - 7 mg/kg TCE - 0.5 mg/kg cis-1,2-DCE - 0.5 mg/kg VC - 0.2 mg/kg
Remedy Level:		Full Scale Remedy

Technologies

In Situ Biostimulation

Why the technology was selected:
HRC^® was selected to augment the natural degradation of the solvent plume, and achieve cleanup goals quicker.

Date implemented:
May 2000 for HRC^® injection

Final remediation design:
In May 2000, approximately 7,000 lbs of hydrogen releasing compound (HRC^®) was injected into 45 borings within an approximately 3,000 ft² area located in the vicinity of the drycleaner source area. During the January and April 2002 sampling events, PCE exceeding the cleanup goal was detected in one monitoring well. In accordance to the approved work plan, a contingency HRC^® injection event was conducted in August 2002. The results of the six subsequent groundwater monitoring events indicate that the dissolved contaminants remain below the cleanup goals.

Results to date:
Confirmatory soil samples were collected indicating that no soil contained chlorinated solvents exceeding cleanup goals. The dissolved contaminants remained below the cleanup goals for the six groundwater monitoring events after the August 2002 injection event.

Next Steps:
A Conditional Certificate of Completion was issued for this site in November 2001. A Final Certificate of Commpletion was issued in June 2004.

Ex Situ Soil Removal

Why the technology was selected:
Removal of soil was selected due to small volume of soil above cleanup levels (40 ft³).

Date implemented:
June 1998 for soil removal

Final remediation design:
In June 1998, approximately 40 ft³ of impacted soils in the interior of the dry cleaner facility were excavated.

Next Steps:
A Conditional Certificate of Completion was issued for this site in November 2001. A Final Certificate of Commpletion was issued in June 2004.

Costs

Cost for Assessment:		No cost data available
Cost for Operation and Maintenance:
Total Costs for Cleanup:

Lessons Learned

1. Contaminant rebound can occur with HRC^® injection. Monitoring should continue for at least one year after injection.

Contacts

Dan Switek
Texas Commission on Environmental Quality
12100 Park 35 Circle, MC-136
Austin, TX 78753
512-239-4132

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U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

State Coalition for Remediation of Drycleaners Site Profiles