Treatment of Explosives-Contaminated Groundwater by In Situ Cometabolic Reduction

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Untitled Document ABSTRACT: Earth Tech Inc. has completed the first field-scale demonstration of in situ explosives-contaminated groundwater treatment by cometabolic reduction using Hydrogen Release Compound (HRC) at Pueblo Chemical Depot (PCD) in Pueblo, Colorado. The study was conducted to address contaminants originating from a former munitions washout facility including; 2,4- dinitrotoluene (2,4-DNT), hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), 1,3,5- trinitrobenzene (1,3,5-TNB), and nitrate. High rates of removal were observed for all contaminants of concern, and risk-based treatment standards were achieved in multiple monitoring wells within 105 days of injection of the HRC product. RDX and 2,4-DNT, the primary contaminants of concern, were reduced from average concentrations 9.3 μg/L and 3.7 μg/L, respectively to less than their analytical method detection limits of 0.0616 μg/L and 0.0509 μg/L, respectively in the most significantly affected wells. 1,3,5-TNB was reduced from an average concentration of 231 μg/L to less than the method detection limit of 0.0811 μg/L, and nitrate was reduced from an average concentration of 6.1 mg/L to less than the method detection limit of 0.2 mg/L in the same wells. The study also evaluated indirect methods of tracking treatment progress, and demonstrated both the in situ movement of HRC product and the diffusion of low redox conditions.

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