ERH & MPE remediation of DNAPL and LNAPL fort lewis superfund site, Washington

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Courtesy of TRS Group, Inc.

As the prime contractor, TRS Group, Inc. (TRS) designed and operated Electrical Resistance Heating (ERH) systems
to treat three LNAPL/DNAPL source areas at the Ft. Lewis, East Gate Disposal Yard (EGDY) NPL site. Contaminants of
concern in NAPL Areas 1, 2 and 3 included chlorinated solvents, primarily trichloroethene (TCE), and POLs (petroleum products, oil and lubricants). Based upon pre- and post-ERH sampling, all remedial objectives were met for each NAPL Area and average TCE concentrations in groundwater were reduced by 99.9%, 99.0% and 99.97% in Areas 1, 2 and 3, respectively. This complex, multi-step ERH project was performed under a guaranteed fixed price remediation (GFPR) contract. Using a Triad management approach and applying lessons learned heating each NAPL area; TRS realized significant project savings for the Army. The Society of American Military Engineers presented the project team with their Silver Design Excellence Award.

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