TRS Group, Inc.

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

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.