Why the technology was selected:
Based on a four-month bench scale test, in-situ chemical oxidation using Fenton's reaction was chosen as the remedy for the site.

Date implemented:
September 2000

Final remediation design:
Three injection points were installed 60-80 ft apart to depths of 7-10 ft bgs. Prior to injection, hydraulic fracturing was used to propogate fractures in the clay and weathered limestone. Coarse sand was used as a proppant. Calculations showed that induced fractures had a radial extent of approximately 60 ft. A total of six injection events were conducted: four in September, one in October, and one in November of 2000. A total of 550 gallons of a biodegradeable surfactant was injected at each injection point to desorb the contaminants from the soil. Next, a total of 310 gallons of a proprietary catalyst solution was injected at each point. Finally, a mixture of a proprietary acid (total of 270 gallons) and a hydrogen peroxide solution (total of 640 gallons) was injected. The maximum injection rate was 1.0 gpm.

Results to date:
Post-remediation soil sampling was conducted in March 2001 and post-remediation groundwater sampling was conducted during the first half of 2001. Soil contaminant concentrations were reduced by 99% and contaminant concentrations in groundwater were reduced by 95-100%. The total area of groundwater treatment was approximately 0.4 acre.

Next Steps:
A Certificate of Completion was issued on October 16, 2002.