Why the technology was selected:
The presence of PCE degradation products indicated that reductive dechlorination has occurred. HRC was utilized to stimulate biodegradation at the site.

Date implemented:
A single injection event of HRC occured in October 2000.

Final remediation design:
HRC was injected at depths of 6-12 ft bgs via direct push at 5 locations upgradient of the contaminant source area. Four lbs/ft were injected for a total of 50 pounds/injection point (total of 250 pounds).

Results to date:
Contaminant concentrations in groundwater in the contamiant source area have decreased since the October 2000 injection event: Source area monitoring well -- from 630 µg/l PCE (February 2001) to 253 µg/l PCE (April 2003). Downgradient monitoring well -- from 50 µg/l PCE (September 2002) to 24 µg/l PCE (April 2003).

Next Steps:
Continued groundwater monitoring was recommended at the site.