Remediation Status: Site closed

Why the technology was selected:
Monitored natural attenuation was selected as the groundwater remedy because conditions favorable for reductive dechlorination were present in groundwater, contaminant concentrations in groundwater were relatively low and PCE daughter products were present.

Results to date:
The SVE system operated at from 89 to 102 scfm with 16 to 18.5 inch w.c. Contaminant concentrations in groundwater began to drop when the SVE was activated. An estimated 14.9 pounds of VOCs were recovered by the system. SVE system was shut down on July 31, 2003. Groundwater monitoring continued until May 2006 when closure requirements were met.

Next Steps:
A Site Rehabilitation Completion Report was issued for the site on February 22, 2007.

Why the technology was selected:
SVE was selected because it is an effective technology for remediating VOCs in permeable unsaturated sediments.

Date implemented:
SVE: April 30, 2002

Final remediation design:
The SVE remedial system consisted of: one vertical vapor extaction well constructed of 4-inch diameter schedule 40 PVC. The well was installed in a hand augered boring beneath the facility floor slab at a location adjacent to the drycleaning machine. The well was screened 2-8.5 ft BLS with 0.010-inch slot size. Piping was extended to the ceiling of the drycleaning facility run out the back wall of the facility to an equipment trailer located in the service alley behind the facility. The system is powered by a 3 HP rotary lobe vacuum blower; vapors are treated by two 175-lb G.A.C. units. The system was designed to at 100 scfm with 30 inches w.c.

Results to date:
The SVE system operated at from 89 to 102 scfm with 16 to 18.5 inch w.c. Contaminant concentrations in groundwater began to drop when the SVE was activated. An estimated 14.9 pounds of VOCs were recovered by the system. SVE system was shut down on July 31, 2003. Groundwater monitoring continued until May 2006 when closure requirements were met.

Next Steps:
A Site Rehabilitation Completion Report was issued for the site on February 22, 2007.

Cost to Design and Implement:
Design: $21,300 Implementation: $40,000

Date implemented:
SVE: April 30, 2002

Final remediation design:
The SVE remedial system consisted of: one vertical vapor extaction well constructed of 4-inch diameter schedule 40 PVC. The well was installed in a hand augered boring beneath the facility floor slab at a location adjacent to the drycleaning machine. The well was screened 2-8.5 ft BLS with 0.010-inch slot size. Piping was extended to the ceiling of the drycleaning facility run out the back wall of the facility to an equipment trailer located in the service alley behind the facility. The system is powered by a 3 HP rotary lobe vacuum blower; vapors are treated by two 175-lb G.A.C. units. The system was designed to at 100 scfm with 30 inches w.c.

Results to date:
The SVE system operated at from 89 to 102 scfm with 16 to 18.5 inch w.c. Contaminant concentrations in groundwater began to drop when the SVE was activated. An estimated 14.9 pounds of VOCs were recovered by the system. SVE system was shut down on July 31, 2003. Groundwater monitoring continued until May 2006 when closure requirements were met.

Next Steps:
A Site Rehabilitation Completion Report was issued for the site on February 22, 2007.

Cost to Design and Implement:
Design: $21,300 Implementation: $40,000