Why the technology was selected:
Natural attenuation was selected for the groundwater remedy because contaminant concentrations were low and the presence of PCE degradation products indicated that some reductive dechlorination had occurred.

Date implemented:
December 13, 2001

Cost to Design and Implement:
$134,598 for all technologies

Why the technology was selected:
SVE is a cost-effective technology for removing VOCs from permeable unsaturated soils.

Date implemented:
December 13, 2001

Final remediation design:
A total of six horizontal SVE wells were installed at the site. Three of the wells were installed beneath the facility floor slab and three wells were installed beneath the floor slab of the adjacent bay in the strip shopping center. Four vertical and and one horizontal passive vapor inlet wells were installed beneath the building floor slab. Three horizontal passive vapor inlet wells were installed outside the western and northern walls of the facility. Approximately 32 tons of soil was removed during system installation. Wells: 4-inch diameter PVC; 6 extraction wells, 4.5 foot screen length Depth: 3 ft beneath floor slab, screen length 3ft; 4 vertical vapor inlet wells, depth 4 ft; 4 horizontal vertical passive vapor inlet wells (screen lengths 16 to 60 ft) SVE motor: 5.0 hp. Rotron blower Design flowrate: 85 cfm, 42-54 in. w.c. Operational flowrate: 70-98.5 cfm, 64 in. w.c. Radius of Influence: 25 ft Emissions treatment: 2-500 lb. GAC vessels in series

Results to date:
The system operated for 4 months (until April 2002). An estimated 0.4 lbs. of PCE was recovered. Confirmatory soil sampling showed that PCE contamination in soils had been reduced to below cleanup target levels. No contaminants were detected in monitor well groundwater samples in concentrations exceeded cleanup target levels during the last two monitor events conducted at the site. The remedial system was removed and a Site Rehabilitation Completion Order was issued for the site on October 25, 2002.

Cost to Design and Implement:
$134,598 for all technologies

Date implemented:
December 13, 2001

Final remediation design:
SVE emissions treatment: 2-500 lb. GAC vessels in series

Results to date:
The system operated for 4 months (until April 2002). An estimated 0.4 lbs. of PCE was recovered. Confirmatory soil sampling showed that PCE contamination in soils had been reduced to below cleanup target levels. No contaminants were detected in monitor well groundwater samples in concentrations exceeded cleanup target levels during the last two monitor events conducted at the site. The remedial system was removed and a Site Rehabilitation Completion Order was issued for the site on October 25, 2002.

Cost to Design and Implement:
$134,598 for all technologies