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ABSTRACT: Groundwater beneath an active grain storage facility in south
central Kansas is impacted by carbon tetrachloride (CT) which was used as a silo
fumigant. Chloroform (CF) - a recognized anaerobic biodegradation product of
CT - is also present. There is limited evidence for the presence of other CT
catabolites such as dichloromethane (DCM) or chloromethane (CM). Significant
soil impacts were not observed for any constituent. Remedial engineering and
design efforts considered the use of zero-valent iron (ZVI) or EHCTM to support in
situ source management (ISSM) and enhanced passive remediation (EPR) for
treatment of the groundwater plume. Laboratory treatability studies suggested
that ZVI alone was equally effective as EHCTM and offered some potential cost
savings depending on the construction design; however, EHCTM appeared to
provide more complete degradation of CT within the defined treatment area,
potentially avoiding a situation where CT catabolites such as DCM remain as groundwater constituents of interest. Two conceptualized groundwater remedies
(i.e., PRB and source area treatment) using ZVI or EHCTM were subsequently
compared for full-scale field demonstration of their ability to effectively manage a
plume of CT and related compounds.
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