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- W1970029503 abstract "This study demonstrates a remedial approach for completing the remediation of an aquifer contaminated with 1,1,2-trichlorotrifluoroethane (Freon-113) and 1,1,1-trichloroethane (TCA). In 1987, approximately 13,000 pounds of Freon-113 were spilled from a tank at an industrial facility located in the state of New York. The groundwater remediation program consisted of an extraction system coupled with airstripping followed by natural attenuation of residual contaminants. In the first phase, five recovery wells and an airstripping tower were operational from April 1993 to August 1999. During this time period over 10,000 pounds of CFC-13 and 200 pounds of TCA were removed from the groundwater and the contaminant concentrations decreased by several orders of magnitude. However, the efficiency of the remediation system to recover residual Freon and/or TCA reduced significantly. This was evidenced by: (1) low levels (< 10 ppb) of Freon and TCA captured in the extraction wells and (2) a slight increase of Freon and/or TCA in off-site monitoring wells. A detailed study was conducted to evaluate the alternative for the second-phase remediation. Results of a two-year groundwater monitoring program indicated the contaminant plume to be stable with no significant increase or decrease in contaminant concentrations. Monitored geochemical parameters suggest that biodegradation does not influence the fate and transport of these contaminants, but other mechanisms of natural attenuation (primarily sorption and dilution) appear to control the fate and transport of these contaminants. The contaminants appear to be bound to the soil matrix (silty and clay units) with limited desorption as indicated by the solid phase analyses of contaminant concentrations. Results of fate and transport modeling indicated that contaminant concentrations would not exceed the action levels in the wells that showed a slight increase in contaminant concentrations and in the downgradient wells (sentinel) during the modeled timeframe of 30 years. This feasibility study for natural attenuation led to the termination of the extraction system and a transaction of the property, resulting in a significant financial benefit for the original site owner. © 2003 Wiley Periodicals, Inc." @default.
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- W1970029503 date "2003-01-01" @default.
- W1970029503 modified "2023-09-23" @default.
- W1970029503 title "Re-evaluation of treatment approach for a site contaminated with Freon-113 and 1,1,1-trichloroethane" @default.
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- W1970029503 doi "https://doi.org/10.1002/rem.10081" @default.
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