Why the technology was selected:
Selection was based on remedial alternative study (feasibility study). Based on risk related to product application, cost, and success at other sites, enhanced in-situ bioremediation using HRC was selected for pilot test. Full scale remedy selected based on site geology, chemistry, groundwater data, etc.

Date implemented:
Sept. 2002, Inject HRC.Inject HRC at 9 points surrounding MW-4 and MW-13. Product applied in a grid pattern to address target. Removed (by bailing) free product from wells May 2003. Monitoring period 11/02; 1/03; 5/03; 6/04.

Final remediation design:
(To be implemented in mid-2012) Design that limits plume migration and causes source area reduction through biotic and abiotic technologies (Accelerated dechlorination via abiotic and microbial processes). Treatment area includes three areas: Area A- Southeast, Front of facility, MW-13 area, 4,000 square feet, 12 to 22 ft bgs Area B- Footprint of facility, location of previous HRC injection points, 1,525 square feet, 8-13 ft bgs Area C- South-southeast, Front of facility, MW-3 area, 3,500 square feet, 10-18 ft bgs

Other technologies used:
Accelerated dechlorination via abiotic and microbial processes

Results to date:
Little success with HRC and Sodium Permanganate injections with no effect observed in downgradient well approximately 5 ft away. CVOCs continue to fluctuate above MCLs in GW.

Next Steps:
Injection to promote accelerated dechlorination by biotic and abiotic processes as well as additional subslab and indoor air monitoring is scheduled to occur in Summer 2012. Anticipated to treat plume and possibly lower risk of VI at site.

Why the technology was selected:
Selection was based on remedial alternative study (feasibility study). Based on risk related to product application, cost, and success at other sites, enhanced in-situ bioremediation using HRC was selected for pilot test. Full scale remedy selected based on site geology, chemistry, groundwater data, etc.

Date implemented:
May 2005 to January 2008: Sodium Permanganate

Final remediation design:
(To be implemented in mid-2012) Design that limits plume migration and causes source area reduction through biotic and abiotic technologies (Accelerated dechlorination via abiotic and microbial processes). Treatment area includes three areas: Area A- Southeast, Front of facility, MW-13 area, 4,000 square feet, 12 to 22 ft bgs Area B- Footprint of facility, location of previous HRC injection points, 1,525 square feet, 8-13 ft bgs Area C- South-southeast, Front of facility, MW-3 area, 3,500 square feet, 10-18 ft bgs

Other technologies used:
Accelerated dechlorination via abiotic and microbial processes

Results to date:
Little success with HRC and Sodium Permanganate injections with no effect observed in downgradient well approximately 5 ft away. CVOCs continue to fluctuate above MCLs in GW.

Next Steps:
Injection to promote accelerated dechlorination by biotic and abiotic processes as well as additional subslab and indoor air monitoring is scheduled to occur in Summer 2012. Anticipated to treat plume and possibly lower risk of VI at site.