Why the technology was selected:
The predominant portion of the contaminant mass was located in the unsaturated zone at the site in sandy soils. The depth to water at the site was relatively deep.

Date implemented:
March 1999

Final remediation design:
The SVE system operated for approximately six months with one extraction well using the following design: Depth: 40 ft bgs Screened interval: 10-40 ft bgs Motor size: 3 hp Capacity: 147 scfm (at design vacuum of 66 in. w.c.) Ultimate flow rate: 160 scfm (at zero vacuum); 50 cfm (at 190 in. w.c.) Emissions treatment: Two 200 lb. GAC canisters System performance was monitored by soil vapor samples collected weekly for the first month, monthly for the next two months, and quarterly thereafter. Site rehabilitation progress was monitored by groundwater samples collected at system start-up and quarterly thereafter.

Results to date:
Confirmatory soil sampling indicates that contaminant concentrations were below FDEP SCTLs. Additionally, with the exception of 10 mg/kg of PCE at a depth of one foot at one soil boring, all VOC concentrations were below laboratory detection limits. At the time of final monthly sampling the system had removed a total mass of 3.77 pounds of VOCs from the subsurface soils. PCE concentrations in groundwater samples decreased to below CTLs. In addition, the most recent laboratory analyses indicated that contaminant concentrations were all below CTLs and laboratory detection limits for all monitor wells. Remediation is complete. Criteria for No Further Action have been met. The Site Rehabilitation Completion Order has been filed and the site closed.

Cost to Design and Implement:
$ 77,779.22 (SVE system was put into a trailer for use at other drycleaning sites.)