U.S. EPA Contaminated Site Cleanup Information (CLU-IN)


U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Fractured Bedrock Project Profiles

Last Updated: January 1, 2011

Point of Contact:
Leslie McVickar
USEPA 5 Post Office Sq., Suite 100
Mail Code OSRR07-4
Boston MA 02109-3912 
Tel: 617-918-1374 
Email: mcvickar.leslie@
pa.gov

Linemaster Switch Corporation
Woodstock, CT


Hydrogeology:

The overburden or unconsolidated deposits in the study area have been mapped as till. This unit consists of a non-sorted and non-stratified mixture of clay, silt, sand, gravel, and boulders and may also contain thin interbedded lenses of stratified sand, silt or gravel.

The schist is the country bedrock in the region and was subsequently intruded by the granite pegmatite. Much of the granite pegmatite intrusions appear to occur as a series of sills. During drilling of deep bedrock wells, granite pegmatite sills were encountered.

There is an extensive discussion of the site hydrogeology in the RI at http://www.epa.gov/region1/superfund/sites/linemaster/448631.pdf

Targeted Environmental Media:
  • - Fractured Bedrock

Contaminants:

Not given but contamination is in deep bedrock.

Major Contaminants and Maximum Concentrations:
  • - Acetone (50,000 µg/L)
  • - Trichloroethene (800,000 µg/L)
  • - 1,2-Dichloroethene (26,000 µg/L)
  • - 2-Butanone (MEK) (38,000 µg/L)
  • - 2-Hexanone (2,100 µg/L)
  • - Toluene (64,000 µg/L)
  • - Tetrachloroethene (1,800 µg/L)
  • - 1,1,1-Trichloroethane (1,700 µg/L)
  • - Cadmium (757 µg/L)
  • - Arsenic (513 µg/L)

Site Characterization Technologies:

  • - Borehole Geophysics
    • Single Point Resistance
    • Natural Gamma
    • Caliper
    • Acoustic Televiewer
    • Video Camera Televiewer
    • Other (Resistivity, Spontaneous Potential)
  • - Fluid Loggings
    • Temperature
    • Conductivity/Resistivity
  • - Vertical Chemical Profiling
    • Packer Isolation
  • - Surface Conductivity Surveys (EM)
  • - Coring
  • - Other (Slug)

Remedial Technologies:

  • - Pump and Treat
Comments:
The groundwater pump and treat system became operational in 1998 and continues.
Remediation Goals:

Cleanup goals are MCLs.


Status:

The pump and treat system continues to operate. While concentrations of some contaminants (e.g. acetone) have fallen off dramatically TCE and DCE remain very high (10s of thousands of ug/L.

http://cfpub.epa.gov/supercpad/cursites/csitinfo.cfm?id=0100041

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For more information on Fractured Bedrock, please contact:

Ed Gilbert
Technology Assessment Branch

PH: (703) 603-8883 | Email: gilbert.edward@epa.gov