Remediation Status: In active remediation

Why the technology was selected:
Indoor air concentrations in adjacent tenant spaces was considered an imminent hazard to receptors, so needed to reduce indoor air concentrations from vapor intrusion pathway and reduce soil concentrations in source areas beneath the building to reduce VI risks in future. SVE offered greatest radius of influence beneath the building than other technologies and could be implemented quicker than acquiring state permits for substrate injections.

Date implemented:
May 16, 2011

Final remediation design:
5 SVE Wells installed in the highest concentrations in soil beneath the building footprint connected to one blower.

Results to date:
Removed 64 lbs of contaminant mass based on effluent air concentrations within first two months of operation. Air flow rates were lower than expected, but good vacuum is being observed. Thus, the system should address the soil contamination over the long term.

Next Steps:
When SVE effluent concentrations have decreased and stabilized, the system will be shutdown to test indoor air levels during periods when the dry-cleaner is not operating to determine if the levels warrant continued operation of the SVE system. The SVE system will be kept in place and reactivated if groundwater treatment becomes necessary if SVE remediation of soils is not sufficient to decrease indoor air concentrations. Once equilibrium has been reached with effluent concentrations, pulsing the SVE blower has shown to effectively increase effluent concentrations if remediation goals have not been met before expenditure of additional capital costs to expand the system.

Cost to Design and Implement:
$171,095.53