At a site in northern Indiana on behalf of a multinational client, Troy Risk operated a groundwater remediation system to cleanup the source of chlorinated solvent impact to a groundwater aquifer system. Prior to 1988, the site was occupied by a manufacturing facility. In March 1995, chlorinated volatile compounds (CVOCs) were detected pursuant to due diligence for real estate refinancing. From 1996 to 1999, a series of subsurface investigations were conducted to determine the nature and extent of impacted soil and groundwater from a release of CVOCs at the site. The investigations concluded that:
- Trichloroethene (TCE) and related CVOCs were found in two source areas.
- The release of TCE probably occurred as surface spills of spent solvent.
- CVOC-impacted soil was delineated around the two source areas.
- CVOC-impacted groundwater was delineated and shown to be migrating downgradient to the north.
The site entered into the Indiana Department of Environmental Management (IDEM) Voluntary Remediation Program (VRP) to address source area contamination. Groundwater was remediated using an air sparge and soil vapor extraction (AS-SVE) system, which effectively remediated source area soil and groundwater. The AS-SVE system consisted of four AS and four SVE wells each at the two source areas. During the operation period, the AS-SVE system removed approximately 58 pounds of VOCs. The AS-SVE system was shut down based on the attainment of asymptotic VOC values and groundwater analytical data below project cleanup levels. In 2006, the project obtained a Certificate of Completion for meeting the remediation goals in IDEM’s Voluntary Remediation Program.