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: April 12, 2004

Point of Contact:
Thomas Andrews
51 Everett Drive
Suite A-10
West Windsor NJ 08550 
Tel: 212-755-6502 
Fax: 212-755-6503
Email: Tandrews@

Former Maintenance and Repair Garage
West Chester, NY


The geology consists of very fine to coarse sand and gravel with occasional cobbles. This is underlain by highly weathered and decomposed bedrock ranging from 11 to 17.5 ft. bgs. with contaminatio extending to an approximate depth of 20 ft. bgs. The ground water velocity is fairly slow.

Targeted Environmental Media:
  • - Fractured Bedrock


Site area is ~20,000 sq. ft at an interval of 11 to 20 ft bgs.

Field pilot program: November 2000

Two separate plumes BTEX and MTBE.

Major Contaminants and Maximum Concentrations:
  • - Benzene-toluene-ethylbenzene-xylene (BTEX) (4,900 µg/L)
  • - Methyl tert butyl ether (450 µg/L)

Site Characterization Technologies:

No technologies selected.

Remedial Technologies:

  • - Chemical Oxidation (In Situ)
    • Fenton's Reagent
Two ten day injection events was completed in November 2000. Results indicated a 66% decrease of total average BTEX contamination and 62% decrease of the total average MTBE concentrations.
Remediation Goals:

ISOTEC recommending site closure based on program results, which remain below the applicable regulatory criteria


On July 17, 2001 the NYSDEC issued a No Further Action letter based on the results.

Top of Page