Predominant rock types within the fractured bedrock aquifer consist of siltstone and shale.
Targeted Environmental Media:
 Fractured Bedrock
The extent of the contaminant plume was approximately 2,000 feet from the source area.
Major Contaminants and Maximum Concentrations:
- Metolachlor (12,000 µg/L)
- Alachlor (4,600 µg/L)
No technologies selected.
- Other (Persulfate)
Comments:
In the summer of 2005, a chemical oxidant was injected from a gravityfed, 1,000-gallon tank into the ground water at the site. Further information not provided in the source cited.
The objective of the pilot study was to test whether a chemical oxidant injected into the fractured medium could follow the same path as the contaminants traveled during initial release, thus facilitating cleanup of the contaminated site.
The pilot study was completed in fall 2005, with a full-scale implementation planned for summer 2006.
The oxidant was delivered via a batch injection infiltration gallery after the contaminated soil had been excavated and before clean fill was added. This approach was found the most cost-effective for this site.
References: Derek Tomlinson, Kristopher Saum, Shari Walsh, Gregory Smoot, and Dennis Newman. Cost-Effective ISCO Application within a Herbicide-Impacted Fractured Bedrock Aquifer. The Fifth International Conference on Remediation of Chlorinated and Recalcitrant Compounds. May 22-25, 2006. Monterey, California.
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