Weathered siltstone and poorly sorted sandstone
Targeted Environmental Media:
 Fractured Bedrock
Major Contaminants and Maximum Concentrations:
- Trichloroethene (var)
No technologies selected.
- Chemical Oxidation (In Situ)
- Fracturing
Comments:
During this project, 3,530 gallons of KMnO4, at a concentration of approximately 5% by weight was injected into the target source zone. Prior to the chemical oxidant injection, pressures up to 450 psig were required to first initiate fractures within the formation. Upon completion of the fracturing step, liquid atomized injection (LAI) of the KMnO4 was performed. During the injection events, evidence of chemical emplacement was observed radially outward to 90 ft. Within one month after the injections were completed, greater than 80% reduction of TCE was observed in ground water. More importantly, little to no contaminant rebound has been observed within the pilot test area. A limited amount of rebound was observed along the up-gradient fringe areas of the pilot test area, presumably due to the influx of some contaminated ground water.
This was a pilot test.
The test was completed in 2003.
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