Site geology consists of fractured granitic bedrock. The groundwater travels within the competent bedrock through highly degraded fractures.
Targeted Environmental Media:
 Fractured Bedrock
Major Contaminants and Maximum Concentrations:
- Tetrachloroethene (0 µg/L)
- Trichloroethene (0 µg/L)
- Borehole Geophysics
- Acoustic Televiewer
- Video Camera Televiewer
- Tracer (dye) Test
Comments:
The pilot study at the site was performed in two phases. Site characterization for the initial phase is not indicated in the reference; however, for the design of the second phase, additional lithologic and hydrogeologic characterization was achieved using a tracer test with three different tracers, reverse circulation air rotary drilling, optical and acoustic televiewing, and observation wells (including one multilevel well).
- Bioremediation (In Situ)
- Reductive Dechlorination (In Situ Bioremediation)
Comments:
Phase I of the pilot study took place in December 2005 and consisted of 1,530 liters of Emulsified Oil Substrate (EOS) solution and 285 liters of chase water introduced via three injection wells oriented perpendicular to the groundwater flow. Performance monitoring took place for a year after injection. Phase II of the pilot study was set to be implemented in 2008 and combined EOS with bioaugmentation.
None provided
Phase I results revealed stalled PCE dechlorination at cis-1,2-dichloroethene and concentrations rebounded as the electron donor was depleted and redox conditions became more oxidizing.
References:
Boysun, Melissa A, Rebecca H. Mora, Sarah Grossi, and Patrice Hallman. Subsurface Characterization in Support of an in Situ Bioremediation Pilot Study in Fractured Granitic Bedrock, Platform Abstract Session A4. Presented at the Sixth International Conference on Remediation of Chlorinated and Recalcitrant Compounds. Monterey, CA. May 19-22, 2008.
|
