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Groundwater redox conditions change from suboxic to much more reducing environments within and around the plume, indicating that oxidation of organic contaminants and degradation products is occurring at the study site.\n TCE<\/jats:styled-content>\n and\n cis<\/jats:italic>\n \u2010\n DCE<\/jats:styled-content>\n were observed in 13 of 14 wells sampled.\n VC<\/jats:styled-content>\n , ethene, and\/or ethane were also observed in ten wells, indicating that partial\/full dechlorination has occurred. Chlorine isotopic values (\n \n \u03b4\n 37<\/jats:sup>\n Cl\n <\/jats:styled-content>\n ) range between 1.39 to 4.69\u2030\n SMOC<\/jats:styled-content>\n for\n TCE<\/jats:styled-content>\n , and 3.57 to 13.86\u2030\n SMOC<\/jats:styled-content>\n for\n cis<\/jats:italic>\n \u2010\n DCE<\/jats:styled-content>\n . Carbon isotopic values range between \u221228.9 and \u221220.7\u2030\n VPDB<\/jats:styled-content>\n for\n TCE<\/jats:styled-content>\n , and \u221226.5 and \u221211.8\u2030\n VPDB<\/jats:styled-content>\n for\n cis<\/jats:italic>\n \u2010\n DCE<\/jats:styled-content>\n . In most wells, isotopic values remained steady over the 15\u2010month study. Isotopic enrichment from\n TCE<\/jats:styled-content>\n to\n cis<\/jats:italic>\n \u2010\n DCE<\/jats:styled-content>\n varied between 0 and 13\u2030 for carbon and 1 and 4\u2030 for chlorine. Calculated chlorine\u2010carbon isotopic enrichment ratios (\n \n \u03f5\n Cl<\/jats:sub>\n <\/jats:styled-content>\n \/\n \n \u03f5\n C<\/jats:sub>\n <\/jats:styled-content>\n ) were 0.18 for\n TCE<\/jats:styled-content>\n and 0.69 for\n cis<\/jats:italic>\n \u2010\n DCE<\/jats:styled-content>\n . Combined, isotopic and chemical data indicate very little dechlorination is occurring near the source zone, but suggest bacterially mediated degradation is occurring closer to the edges of the plume.\n <\/jats:p>","DOI":"10.1111\/gwat.12440","type":"journal-article","created":{"date-parts":[[2016,7,5]],"date-time":"2016-07-05T11:43:19Z","timestamp":1467718999000},"page":"88-99","source":"Crossref","is-referenced-by-count":4,"title":["Compound\u2010Specific Isotope Analyses to Assess TCE Biodegradation in a Fractured Dolomitic Aquifer"],"prefix":"10.1111","volume":"55","author":[{"given":"Justin A.","family":"Clark","sequence":"first","affiliation":[{"name":"Department of Earth & Environmental Sciences University of Waterloo, 200 University Ave W,\u2009Waterloo Ontario N2L 3G1 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Randy L.","family":"Stotler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shaun K.","family":"Frape","sequence":"additional","affiliation":[{"name":"Department of Earth & Environmental Sciences University of Waterloo, 200 University Ave W,\u2009Waterloo Ontario N2L 3G1 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Walter A.","family":"Illman","sequence":"additional","affiliation":[{"name":"Department of Earth & Environmental Sciences University of Waterloo, 200 University Ave W,\u2009Waterloo Ontario N2L 3G1 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2016,7,5]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/es801759k"},{"key":"e_1_2_8_3_1","volume-title":"Bioremediation and Natural Attenuation: Process Fundamental and Mathematical Models","author":"Alvarez P.J.","year":"2006"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0146-6380(99)00057-1"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/es991179k"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1745-6592.2011.01344.x"},{"key":"e_1_2_8_7_1","first-page":"267","volume-title":"Dense Chlorinated Solvents and other DNAPLs in Groundwater","author":"Butler B.J.","year":"1996"},{"key":"e_1_2_8_8_1","volume-title":"Dehalogenation: Microbial Processes and Environmental Applications","author":"Chapelle F.","year":"2003"},{"key":"e_1_2_8_9_1","unstructured":"Clark J.A.2011. 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