Why the technology was selected:
In-situ chemical oxidation using Fenton's reaction was selected after a four-month bench test using soil samples collected from the site.

Date implemented:
September 2000

Final remediation design:
Four injection points were installed to depths of 16 to 18 ft BGS using a pneumatic hammer. Three injection points were screened for horizontal distribution of injectants and one point was screened vertically to facilitate vertical distribution of injectants over the contaminated soil. Hydraulic fracturing was utilized to introduce course sand to propogate fractures in the aquifer. Calculations indicate that the radial extent of the induced fractures was 60 ft. Water was injected into the the vertically screened injection point to saturate the vadose zone soils. Six injection events were conducted: 4 in September, one in October and one in November of 2000. A biodegradeable surfactant (550 gallons) was injected at each injection point to desorb contaminants from the soil/aquifer. This was followed by a solution of proprietary catalyst (116 gallons). Finally, a mixture of a proprietary acid (295 gallons) and hydrogen peroxide (515 gallons, concentration not given) was injected at each injection point. The maximum injection rate was 2.0 for the the horizontal points and 0.7 gallons for the vertical point. The volume of treated soil was approximatley 172 cubic yards. The groundwater treatment area was approximately 0.74 acres.

Results to date:
Post-remediation soil sampling was conducted in March 2001, and post-remediation groundwater sampling was conducted in January 2001. Contaminant concentrations were reduced 56 to 99.9% in soils and groundwater contaminant concentrations showed reductions of 83 to 100%.

Next Steps:
A Certificate of Completion was issued for the site on November 12, 2002.