Hydraulic characterization tests suggested that ground water flows through the granitic gneiss and is partially re-directed up the fractured, permeable contact between the granitic gneiss and the dolomite formations. The ground water flows up the contact and is released to the surface through seeps, springs, and a stream. Several fractures that intersect the contact were identified as potential contaminant migration pathways.
Targeted Environmental Media:
 Fractured Bedrock
The trichloroethene (TCE) plume was 300 feet deeper and several hundred feet wider than had been originally identified. TCE contamination was identified in both transmissive and non-transmissive fractures.
Major Contaminants and Maximum Concentrations:
- Trichloroethene (0 µg/L)
- Borehole Geophysics
- Caliper
- Acoustic Televiewer
- Fluid Loggings
- Temperature
- Conductivity/Resistivity
- Flow
- Pumping Tests
- Coring
- Other (Acoustic televiewer logs, chemical and hydraulic tracker sampling, in-well flow evaluation)
No technologies selected.
The goal of the pilot study was to accurately characterize the fractured bedrock system at the site.
No remediation took place in this pilot study.
It is important to understand the hydraulics of the fractured bedrock system before the contaminant plume is evaluated. A multi-faceted approach facilitated better understanding of the fractured bedrock system.
References: Malaniak, Charles and Gordon Jamieson. Tools, Techniques and Anaylsis for Fractured Bedrock Characterization and Evaluation. The Fifth International Conference on Remediation of Chlorinated and Recalcitrant Compounds. May 22-25, 2006. Monterey, California.
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