No site characteristics were identified in the references reviewed.
Targeted Environmental Media:
 Fractured Bedrock
Groundwater monitoring and fractured bedrock drilling showed that the impacts of the fuel oil release extended 14 to 20 feet below grade and 20 to 40 feet from the release point.
Major Contaminants and Maximum Concentrations:
- Fuels and distillates (0 µg/L)
No technologies selected.
- Chemical Oxidation (In Situ)
- O2
- Fenton's Reagent
- Ozone
- Pump and Treat
- Other (Sodium persulfate)
Comments:
Impacted soil beneath the house was removed through the use of a custom trench box and extracted by Vactor. Removal was followed by two rounds of in situ treatment by ENPRO and groundwater was captured through bedrock recovery wells and treated on-site. In situ treatment consisted of (1) eight applications of 700 to 1,000 gallons of surfactant/emulsifier together with Fentonýs reagent and (2) injection of 4,100 gallons of EnChem OxyZone (a combination of sodium persulfate, hydrogen peroxide, ozone, and phosphates).
MCP Category GW-1 Standards
The initial in situ treatment promoted dissolved petroleum constituent recovery and a large reduction of Extractable Petroleum Hydrogen (EPH) and Volatile Petroleum Hydrocarbons (VPH); however, EPH and BPH concentrations did not reach MCP GW-1 Groundwater Risk Standards. Therefore, the second in situ treatment was required. Initial findings show EPH and VPH reductions that are significant enough to achieve MCP Standards. Increased sulfate concentration and depressed groundwater pH were observed following the in situ applications.
No lessons learned were identified in the references reviewed.
References:
Brown Geoffrey A., Fiedler, Andrew W., Thibault, Roger P., Ball, Raymond G., and Elsenbeck, Jim. Evaluation of Two Methods of In-Situ Treatment in Fractured Bedrock at a Residential Fuel Release Site. Presented at the 26th Annual International Conference on Soils, Sediments, Water and Energy. University of Massachusetts, Amherst. October 18-21, 2010.
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