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• W2034496807 abstract "A dual isotope approach based on compound-specific isotope analysis (CSIA) of carbon (C) and chlorine (Cl) was used to identify sources of persistent trichloroethylene (TCE) that caused the shut-down in 1994 of a municipal well in an extensive fractured dolostone aquifer beneath Guelph, Ontario. Several nearby industrial properties have known subsurface TCE contamination; however, only one has created a comprehensive monitoring network in the bedrock. The impacted municipal well and many monitoring wells were sampled for volatile organic compounds (VOCs), inorganic parameters, and CSIA. A wide range in isotope values was observed at the study site. The TCE varies between −35.6‰ and −21.8‰ and from 1.6‰ to 3.2‰ for δ13C and δ37Cl, respectively. In case of cis-1,2-dichloroethene, the isotope values range between −36.3‰ and −18.9‰ and from 2.4‰ to 4.7‰ for δ13C and δ37Cl, respectively. The dual isotope approach represented by a plot of δ13C vs. δ37Cl shows the municipal well samples grouped in a domain clearly separate from all other samples from the property with the comprehensive well network. The CSIA results collected under non-pumping and short-term pumping conditions thus indicate that this particular property, which has been studied intensively for several years, is not a substantial contributor of the TCE presently in the municipal well under non-pumping conditions. This case study demonstrates that CSIA signatures would have been useful much earlier in the quest to examine sources of the TCE in the municipal well if bedrock monitoring wells had been located at several depths beneath each of the potential TCE-contributing properties. Moreover, the CSIA results show that microbial reductive dechlorination of TCE occurs in some parts of the bedrock aquifer. At this site, the use of CSIA for C and Cl in combination with analyses of VOC and redox parameters proved to be important due to the complexity introduced by biodegradation in the complex fractured rock aquifer. It is highly recommended to revisit the study when the municipal well is back into full operation." @default.
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• W2034496807 date "2012-01-04" @default.
• W2034496807 modified "2023-10-14" @default.
• W2034496807 title "Fingerprinting TCE in a Bedrock Aquifer Using Compound-Specific Isotope Analysis" @default.
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• W2034496807 doi "https://doi.org/10.1111/j.1745-6584.2011.00897.x" @default.
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