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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 Tetrachloroethene |
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| Media Type | Groundwater Dense Non-aqueous Phase Liquids (DNAPLs) |
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| 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 CH2M HILL, Inc. |
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| 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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