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IN-SITU THERMAL TREATMENT SYSTEM PERFORMANCE AND MASS REMOVAL METRICS AT FORT LEWIS
Citation:
SMITH, R., K. LYNCH, E. DAVIS, T. POWELL, J. STURZA, AND R. WILSON. IN-SITU THERMAL TREATMENT SYSTEM PERFORMANCE AND MASS REMOVAL METRICS AT FORT LEWIS. Presented at Battelle's Fifth International Conference on Remediation of Chlorinated and Recalcitrant Compounds, Monterey, CA, May 22 - 25, 2006.
Impact/Purpose:
To inform the public.
Description:
The EGDY is the source of a potentially expanding three mile long TCE plume in a sole source drinking water aquifer. Thermal remediation is being employed to reduce source mass loading to the dissolved phase aquifer plume and reduce the time to reach site cleanup goals. This is a full scale remedial action designed to treat three DNAPL source zones for a total sub-surface volume of 87,500 cubic yards in glacial outwash sand and gravel and glacial till with an estimated 20,000 to 60,000 kg of TCE in DNAPL. DNAPLs are being treated in the vadose and saturated zones to a maximum of 45 feet below ground surface. Thermal remediation of the first DNAPL source zone operated from December 2003 to August 2004. The second source zone treatment began in February 2005 and is anticipated to be completed in August 2005. The third DNAPL source zone treatment effort is scheduled to begin in the Spring of 2006 and be completed before the end of calendar year 2006. The treatment system consists of hollow electrodes with slotted openings for multi-phase contaminant extraction, two central processing units to control electrical input to electrodes, groundwater extraction and injection wells/trenches for hydraulic control, and an above ground treatment system to treat extracted liquids and vapors.