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 31, 2010

Point of Contact:
Roy Schrock
USEPA 1650 Arch Street
Mail Code: 3HS22
Philadelphia 19103-2029 
Tel: 215-814-3210 
Email: schrock.roy@
pa.gov

Crossley Farm
Hereford Township, PA


Hydrogeology:

The Site is located in the Reading Prong Physiographic Province. The topography reflects the
complex underlying bedrock geology and consists of high hills and ridges underlain by bedrock.

The most prominent highland within the study area occurs at the Site and is known locally as Blackhead Hill. The hill is very steeply sloped to the west and south of its crest. To the north and
east of its crest, the hill is fairly level or flat and supports a working farm over much of its area. The crest of Blackhead Hill is underlain by the Hardyston Quartzite, which makes an attractive building stone.

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

Contaminants:

Vertical contamination extends to 400 feet bgs. The length of the plume is almost 3 miles.

Major Contaminants and Maximum Concentrations:
  • - Trichloroethene (1,300,000 µg/L)
  • - Tetrachloroethene (12,000 µg/L)
  • - 1,2-Dichloroethene (1,940 µg/L)
  • - 1,2-Dichloroethane (140 µg/L)
  • - Vinyl chloride (20 µg/L)

Site Characterization Technologies:

  • - Other (FLUTe)

Remedial Technologies:

  • - Chemical Oxidation (In Situ)
    • Permanganate
  • - Pump and Treat
Comments:
The source control pump and treat system has three extraction wells at 150 feet bgs, two at 338 Feet bgs, and 1 at 418 feet bgs. The wells were drilled in 2002 and 2003. The treatment system includes carbon, UV/oxidation, and a knockdown system for capturing NAPL. Additionally, four wells for injection of treated groundwater (I-1 through I-4) and three piezometers (P-1 through P-3) for pressure measurement were installed between January 2003 and February 2004.This system has yet to become operational (2010).

In 2004 a potassium permanganate pilot test was conducted.

A ROD amendment was issued in 2008 that did not replace the hotspot system discussed above but added a downgradient extraction system to intercept 1,000 ug/L TCE plume in the fault area. It was anticipated in the ROD that the hotspot system will come on line after the plume system.


Remediation Goals:

MCLs are the cleanup goals.


Status:

Construction of the eleven well extraction system to treat the plume began in June 2010.

http://cfpub.epa.gov/supercpad/cursites/csitinfo.cfm?id=0302402

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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