Saprolite overlying fractured amphibole gneiss. TCE was found in two aquifers, one in saprolite (26.2 bgs) and one in bedrock (34.4 bgs).
Targeted Environmental Media:
 Fractured Bedrock
The treatment area in the bedrock was 1,575 sq ft.
Major Contaminants and Maximum Concentrations:
- Trichloroethene (8,000 µg/L)
- 1,1-Dichloroethene (240 µg/L)
- Vinyl chloride (18 µg/L)
No technologies selected.
- Bioremediation (In Situ)
- Reductive Dechlorination (In Situ Bioremediation)
Comments:
The application in the bedrock was to create a treatment wall by drilling injection at ten ft intervals downgradient of the source area.
This was a pilot test.
In almost two years of treatment concentrations of TCE in the bedrock decreased 99.3% to 60 ug/L. Concentrations of DCE and VC increased. In Jan. 2004, full-scale treatment is pending.
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