Why the technology was selected:
Natural attenuation was selected as a groundwater remedy because there were low contaminant concentrations in groundwater and the prence of PCE degradtion products indicated that reductive dehclorination was actively occurring in groundwater.

Date implemented:
January 26, 2000

Final remediation design:
The groundwater remedy at the site was natural attenuation with monitoring.

Results to date:
SRCO approved 08/27/02. Results: Confirmatory soil sampling indicated that contaminant concentrations in soils are below cleanup target levels. The SVE system is estimated to have removed 5.73 lbs of VOCs from the subsurface. The SVE system was decomissioned on July 16, 2000. Contaminant concentrations in groundwater samples collected from monitor wells were below cleanup target levels during the last two monitoring events. Last sampling event was conducted on November 1, 2001. A Site Rehabilitation Completion Order was issued for this site on August 13, 2002.

Cost to Design and Implement:
$31,170 for all technologies

Why the technology was selected:
The predominant portion of the contaminant mass was located in the unsaturated zone in permeable soils. SVE is a cost effective technology for removing VOCs form permeable unsaturated sediments.

Date implemented:
January 26, 2000

Final remediation design:
The SVE system used two extraction wells and two air inlet wells. All four wells were installed beneath the floor slab of the drycleaning facility in the area near the drycleaning machines. Piping for all the wells was run to the ceiling of the facility and was then routed to the rear of the building. Depth (all wells): 6 ft beneath the building floor slab Screen interval: 1-6 ft beneath building floor slab Blower(SVE wells) 5 hp, capacity : 120 cfmat design vacuum of 60 in w.c. Ultimate flow rate: 131 cfm at vacuum of 40 in w.c. Blower (air inlet wells): 2.5 hp capacity: 80 cfm at design vacuum of 60 in w.c. Emission treatment: 170 lb. GAC canister Radius of influence: SVE - 10 ft (well); air inlet well 15 ft System radius of influence: 20 ft. The system was operated for 6 months - until July 16, 2000. For the first 5 weeks of operation, all four wells (SVE and air inlet wells) were piped into the SVE system. Beginning in March, the air inlet blower was activated for the next two months and quarterly thereafter.

Results to date:
SRCO approved 08/27/02. Results: Confirmatory soil sampling indicated that contaminant concentrations in soils are below cleanup target levels. The SVE system is estimated to have removed 5.73 lbs of VOCs from the subsurface. The SVE system was decomissioned on July 16, 2000. Contaminant concentrations in groundwater samples collected from monitor wells were below cleanup target levels during the last two monitoring events. Last sampling event was conducted on November 1, 2001. A Site Rehabilitation Completion Order was issued for this site on August 13, 2002.

Cost to Design and Implement:
$31,170 for all technologies

Why the technology was selected:
The predominant portion of the contaminant mass was located in the unsaturated zone in permeable soils. SVE is a cost effective technology for removing VOCs form permeable unsaturated sediments.

Date implemented:
January 26, 2000

Final remediation design:
The SVE system used two extraction wells and two air inlet wells. All four wells were installed beneath the floor slab of the drycleaning facility in the area near the drycleaning machines. Piping for all the wells was run to the ceiling of the facility and was then routed to the rear of the building. Depth (all wells): 6 ft beneath the building floor slab Screen interval: 1-6 ft beneath building floor slab Blower(SVE wells) 5 hp, capacity : 120 cfmat design vacuum of 60 in w.c. Ultimate flow rate: 131 cfm at vacuum of 40 in w.c. Blower (air inlet wells): 2.5 hp capacity: 80 cfm at design vacuum of 60 in w.c. Emission treatment: 170 lb. GAC canister Radius of influence: SVE - 10 ft (well); air inlet well 15 ft System radius of influence: 20 ft. The system was operated for 6 months - until July 16, 2000. For the first 5 weeks of operation, all four wells (SVE and air inlet wells) were piped into the SVE system. Beginning in March, the air inlet blower was activated for the next two months and quarterly thereafter.

Results to date:
SRCO approved 08/27/02. Results: Confirmatory soil sampling indicated that contaminant concentrations in soils are below cleanup target levels. The SVE system is estimated to have removed 5.73 lbs of VOCs from the subsurface. The SVE system was decomissioned on July 16, 2000. Contaminant concentrations in groundwater samples collected from monitor wells were below cleanup target levels during the last two monitoring events. Last sampling event was conducted on November 1, 2001. A Site Rehabilitation Completion Order was issued for this site on August 13, 2002.

Cost to Design and Implement:
$31,170 for all technologies