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: June 27, 2007

Point of Contact:
Derek Tomlinson
350 Eagleview Blvd., Suite 200
Exton PA 19341 
Tel: 610-524-3500 
Fax: 610-524-7335
Email: Derek.tomlinson@
erm.com

Grownmark FS, Inc. Farm Center
East Berlin, PA


Hydrogeology:

Predominant rock types within the fractured bedrock aquifer consist of siltstone and shale.

Targeted Environmental Media:
  • - Fractured Bedrock

Contaminants:

The extent of the contaminant plume was approximately 2,000 feet from the source area.

Major Contaminants and Maximum Concentrations:
  • - Metolachlor (12,000 µg/L)
  • - Alachlor (4,600 µg/L)

Site Characterization Technologies:

No technologies selected.


Remedial Technologies:

  • - Other (Persulfate)
Comments:
In the summer of 2005, a chemical oxidant was injected from a gravityfed, 1,000-gallon tank into the ground water at the site. Further information not provided in the source cited.
Remediation Goals:

The objective of the pilot study was to test whether a chemical oxidant injected into the fractured medium could follow the same path as the contaminants traveled during initial release, thus facilitating cleanup of the contaminated site.


Status:

The pilot study was completed in fall 2005, with a full-scale implementation planned for summer 2006.


Lessons Learned:

The oxidant was delivered via a batch injection infiltration gallery after the contaminated soil had been excavated and before clean fill was added. This approach was found the most cost-effective for this site.

References: Derek Tomlinson, Kristopher Saum, Shari Walsh, Gregory Smoot, and Dennis Newman. Cost-Effective ISCO Application within a Herbicide-Impacted Fractured Bedrock Aquifer. The Fifth International Conference on Remediation of Chlorinated and Recalcitrant Compounds. May 22-25, 2006. Monterey, California.

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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