U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

For more information on Thermal Treatment - In Situ, please contact:

Jim Cummings
Technology Assessment Branch

PH: (703) 603-7197 | Email: cummings.james@epa.gov

In Situ Thermal Treatment Site Profile Database

Arnold Air Force Base
Last Updated: 08/03/2011
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Site Name   Arnold Air Force Base
Site Location   Tullahoma, TN
Site Type   Federal Facility
Project Name   Solid Waste Management Unit 10, Arnold Engineering Development Center
Project Technology   Conductive Heating (In Situ Thermal Treatment)
Scale   Full scale
Vendor   Not Specified
Project Status   Complete

Contaminants of Concern 1,1,1-Trichloroethane
Media Type Groundwater
Dense Non-aqueous Phase Liquids (DNAPLs)
Extent/size of area of contamination   The source zone covers approximately 27,360 square feet and extends 85 feet below ground surface, resulting in a treatment volume of 66,700 cubic yards
Description of geology/hydrogeology   Shallow, intermediate, and deep aquifers exist at the subject site. The shallow aquifer is composed of well-graded, silty sand interbedded with sandy clay lenses. The intermediate aquifer consists of clayey gravel with interbedded sand lenses. The deep aquifer consists of fractured and highly weathered limestone bedrock.
Cleanup goals or remedial objectives   The remedial objective of the in situ thermal treatment (ISTT) strategy is to remove DNAPL.
Performance data available?   No
Summary and description of performance data   Details regarding the description of the ISTT system performance were not provided in the reference cited.
Comments   Thermal conduction heating (TCH) and steam enhanced extraction (SEE) were selected for the treatment of the source area. 162 heaters installed to depths of 50 to 65 feet below ground surface were used to heat the shallow aquifer. 11 steam injections wells in the basal gravel/upper bedrock zone at 90 feet below ground surface were used to heat the intermediate aquifer. For hydraulic and pneumatic gradient control during treatment, 42 vapor extraction wells and 23 multiphase extraction wells were installed between 45 to 90 feet below ground surface. Thermal oxidation is used to treat the extracted vapor and air stripping with vapor-phase carbon adsorption is used to treat the extracted groundwater.
Site contact information   Jason Cole
Information Source(s)   Cole, Jason et. al. Battelle Conference 2010; Seventh International Conference on Remediation of Chlorinated and Recalcitrant Compounds, "Thermal Conductive Heating Enhanced DNAPL Source Removal"

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