Guaranteed Fixed Price PCE Remediation – Site 22 Naval Station Great Lakes, Illinois TRS Group, Inc. (TRS) worked as a subcontractor to Tetra Tech NUS to remediate PCE-contaminated soil in a tight silt-clay soil matrix. The remedial criteria required all PCE concentrations to be less than 20 mg/kg - a 95.5% reduction of PCE in soil to meet the Illinois EPA Tiered Ap- proach to Corrective Action Objectives (TACO) industrial/ commercial criteri

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