Enhanced Bioremediation of Tetrachloroethene in Central Indiana Glacial Till

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ABSTRACT: The goal of this project is remediation of soil and groundwater impacted by tetrachloroethene (PCE) that infiltrated the vadose and uppermost saturated zone below an active dry cleaning facility in central Indiana. PCE was released and transported to depths less than five meters via the primary porosity of thin sand and silt stringers and via secondary porosity of fractures in lodgment till. Impact to shallow groundwater ranged to 24 milligrams per liter (mg/L). Impact above one mg/L extended over an approximate area of 150 square meters. Significant remediation progress was achieved via the concurrent application of complementary abiotic (micro-scale zero-valent iron [ZVI]) and biotic (electron donor-enhanced) reductive dehalogenation remediation technologies. After substantiating the presence of PCE-degrading bacteria in groundwater, a patent-pending, remediation compound-injection technology was applied to the site in May 2002 and in September 2003. Primary remediation compounds included ZVI and Hydrogen Release Compound (HRC™). Favorable conditions were engendered throughout the area of application, with reduction of PCE through trichloroethene (TCE) to cis-1.2-dichloroethene (cis-1,2-DCE) in several wells after three months, and significant reduction of cis-1,2-DCE to vinyl chloride (VC) after nine months. The project is progressing well, and recent monitoring indicates that VC is degrading in several areas.

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