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Thoreson, K., P. Erickson, B. Hicks A. Punsoni, S. Sittler, D. Taggart, and K. Clark.
RemTech 2019: Remediation Technologies Symposium, 16-18 October, Banff, 33 slides, 2019

PetroFix® Remediation Fluid was field-tested on a contaminated plume downgradient of a former bulk petroleum storage facility in South Bend, IN. Historical remedial efforts included LNAPL recovery and air sparging/soil vapor extraction, but relatively high concentrations of petroleum hydrocarbons remained in the groundwater. PetroFix was injected by low-pressure direct-push methods in an area surrounding a single monitoring well with >50 ppm total petroleum hydrocarbons in the diesel and gasoline range combined. Groundwater samples were monitored at baseline and at regular intervals post-application for standard chemical and geochemical parameters, as well as by QuantArray® Petro for quantification of the bacterial communities. Baseline microbial analysis indicated a moderate presence of both aerobic and anaerobic petroleum degraders. At one and three months post-injection, contaminant concentrations fell >90%. At three months, RNA analysis showed Methylibium petroleiphilum, a known BTEX degrader, replicating robustly. Another line of evidence for biodegradation was the rapid reduction of NO3- followed by a more gradual loss of SO42-. Dissolved methane initially dipped, before climbing to over twice the pre-application concentration, which is consistent with increased hydrocarbon biodegradation, despite the dramatic removal of contamination from the dissolved phase. Slides: Longer abstract: More information:

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