Remediation Status: In active remediation

Date implemented:
April 2011

Final remediation design:
A combination SVE and air sparge
remediation system consisting of nine
vapor recovery wells and four air sparge wells was installed on site. The wells were installed to a depth of 10 feet which is where the majority of soil impact was identified. The system
opperated continually for 6 months.

Results to date:
A mass of approximately 56 pounds of chlorinated volatile organic compounds were removed from the site from 27.55 million cubic feet of air. Post remediation analysis revealed that the highest concetration of PCE discovered in soil was 15.2 mg/kg as compared to the initial concentration of 21,000 mg/kg. No samples reported TCE above applicable PCL. Cis-1,2-DCE, trans1,2-DCE, 1,1-DCE and VC were reported at concentrations near or less than the laboratory detection limits in soil samples. A significant reduction in the areal extent of soil impact has occured as a result of the soil response action.

Next Steps:
Because PCE levels remain above the PCL, operation of the SVE system will contine. Once the soil PCLE zone is eliminated, future leaching to groundwater will be removed.
Developing a plan of action to implement groundwater response action in the near future.
Continued regular groundwater monitoring to assess movement of the impacted groundwater plume.

Cost to Design and Implement:
$130,000

Why the technology was selected:
SVE was the best option for this site because it allowed soil to be decontaminated while working around existing infastructure.

Date implemented:
April 2011

Final remediation design:
A combination SVE and air sparge
remediation system consisting of nine
vapor recovery wells and four air sparge wells was installed on site. The wells were installed to a depth of 10 feet which is where the majority of soil impact was identified. The system
opperated continually for 6 months.

Results to date:
A mass of approximately 56 pounds of chlorinated volatile organic compounds were removed from the site from 27.55 million cubic feet of air. Post remediation analysis revealed that the highest concetration of PCE discovered in soil was 15.2 mg/kg as compared to the initial concentration of 21,000 mg/kg. No samples reported TCE above applicable PCL. Cis-1,2-DCE, trans1,2-DCE, 1,1-DCE and VC were reported at concentrations near or less than the laboratory detection limits in soil samples. A significant reduction in the areal extent of soil impact has occured as a result of the soil response action.

Next Steps:
Because PCE levels remain above the PCL, operation of the SVE system will contine. Once the soil PCLE zone is eliminated, future leaching to groundwater will be removed.
Developing a plan of action to implement groundwater response action in the near future.
Continued regular groundwater monitoring to assess movement of the impacted groundwater plume.

Cost to Design and Implement:
$130,000