The site is underlain by a fractured sandstone aquifer.
Targeted Environmental Media:
 Dense Non-aqueous Phase Liquids (DNAPLs) - Fractured Bedrock
Contaminant concentrations indicated the presence of residual free-phase chlorinated hydrocarbon (CHC) product at the base of the aquifer beneath the building.
No technologies selected.
- Bioremediation (In Situ)
- Reductive Dechlorination (In Situ Bioremediation)
Comments:
Three injection wells were installed as part of a pilot test and Hydrogen Release Compound (HRC) was injected to enhance anaerobic biological in situ cometabolic reduction of contaminants. Contaminant concentrations, by-products, and other parameters of concern were monitored over a 6-month period.
This pilot test was conducted to evaluate the feasibility of enhanced biodegradation for this site.
As a result of the HRC injection, a CHC mass reduction of 62 to 73 percent was achieved within 4 months. After 6 months, concentrations of CHCs within the treated area had decreased to less than 1 percent of the initial levels.
The change in the CHC ratio suggests that the main biodegradation mode may have changed from cometabolic reduction to dehalorespiration.
References:
Rottero, Tess; Craig Walmsley; Oliver Kohnen. 2004. Evaluating Innovative Bioremediation Technologies and Successful Pilot Test Performance. The Fourth International Conference on Remediation of Chlorinated and Recalcitrant Compounds, Monterey, California, May 24-27.
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