Geology:
-Thin veneer of glacially derived overburden.
-Metamorphic bedrock (Schist/Gneiss).
-Horizontal foliations.
-Fracture fabric (horizontally and vertically anisotropic)
Hydrogeology:
-Discontinuous saturated overburden deposits
-Variable vertical gradients
-Contrasting bedrock/overburden flow vectors
-Extremely limited intrinsic permeability in shallow bedrock
Targeted Environmental Media:
 Fractured Bedrock
Major Contaminants and Maximum Concentrations:
- Benzene-toluene-ethylbenzene-xylene (BTEX) (var)
- Methyl tert butyl ether (var)
No technologies selected.
- Fracturing
- Pump and Treat
- Soil Vapor Extraction
- Multi Phase Extraction
- Other (enhanced biodegradationa and natural attenuations)
Comments:
Remediation technologies were evaluated through a series of pilot tests and interim response actions.
The inability to transmit fluids (ground water and vapors) through the shallow bedrock regime where the source mass resided was the principal limitation of remediation.
-Hydraulic control of source areas
-LNAPL recovery
-Source mass removal
-Reduction on Aqueous-phase plume
Mass removal technologies are most effectively applied in source areas. Attempts to recover mass in conjunction with hydraulic control, at distal portions of a plume or at depth, prove to be inherently inefficient and possibly detrimental.
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