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: February 3, 2006

Point of Contact:
John Liskowitz
ARS Technologies Inc.
114 North Ward St.
New Brunswick NJ 08901 
Tel: 732-296-6620 
Fax: 732-296-6625
Email: jl@
arstechnologies.com

Hunter's Point Shipyard
San Francisco, CA


Hydrogeology:

A 10 ft layer of artificial fill overlies fractured bedrock. Ground water is 8 to 9 ft. bgs.

Targeted Environmental Media:
  • - Dense Non-aqueous Phase Liquids (DNAPLs)
  • - Fractured Bedrock

Contaminants:

Major Contaminants and Maximum Concentrations:
  • - Trichloroethene (88,000 µg/L)

Site Characterization Technologies:

  • - Vertical Chemical Profiling
    • Cluster Wells
  • - Other

Comments:
Pump test to determine interconnection of fractures.


Remedial Technologies:

  • - Fracturing
Comments:
In the 2002 pilot test, the geologic matrix was pneumatically fractured and then a high purity micro scale iron powder was injected into four boreholes to treat soil and ground water to about 30 ft below ground surface. The zero valent iron slurry is delivered in a liquid atomized form using nitrogen gas as a carrier fluid. Each well treated about a 25' radius in the fractured rock area. A total of 16,000 lbs of iron was injected during the pilot test.


Remediation Goals:

Source zone remediation


Status:

Within three months of the pilot injection, ground water concentrations of the target CVOC compounds had been reduced by 95-99%. Monitoring wells outside and below the pilot test area showed little evidence of contaminant migration outside the treatment area.

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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