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: December 15, 2005

Point of Contact:
Timothy Pac
ERM
399 Boylston St. 6th Fl.
Boston MA 02116 
Tel: 617-646-7862 
Fax: 617-267-6447
Email: Tim.Pac@erm.com

Industrial Facility
Not Provided, RI


Hydrogeology:

The site consists of a thin veneer of glacial till overlying a soft, fractured metamorphosed, sedimentary sequence.

Targeted Environmental Media:
  • - Fractured Bedrock

Contaminants:

This was a pilot test and the contaminated zone has not been completely delineated.

Major Contaminants and Maximum Concentrations:
  • - Tetrachloroethene (0 µg/L)
  • - Trichloroethene (0 µg/L)

Site Characterization Technologies:

  • - Borehole Geophysics
    • Natural Gamma
    • Caliper
    • Acoustic Televiewer
  • - Fluid Loggings
    • Temperature
    • Conductivity/Resistivity
  • - Flow
    • Heat Pulse Flowmeter
  • - Surface Seismic Surveys
  • - Vertical Chemical Profiling
    • Cluster Wells
  • - Pumping Tests
  • - Fracture Trace Analysis
  • - GPR Surveys

Remedial Technologies:

  • - Chemical Oxidation (In Situ)
    • Permanganate
Comments:
Injection of permanganate into a fractured bedrock aquifer using both pressure and passive injection techniques resulted in a radius of influence of 70 to 100 ft. Evidence of permanganate persistence and migration suggest minimal reaction between the oxident and bedrock. Evaluation of VOC concentration data suggest that the permanganate applications displaced ground water present in fractures immediately following the injections. Upon re-equilibration, VOC concentrations typically remained 85 -90% below pre-injection levels. VOC concentrations also decreased significantly in downgradient wells, suggesting the potential for source area abatement to significantly effect concentrations in the associated plume.
Remediation Goals:

These were pilot tests


Status:

Post application monitoring has been conducted for up to two years.


Lessons Learned:

Persistence of permangnnate generally one year in each area.

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