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In light of the complex management of chlorobenzene (CB) contaminated sites, at which\uda hydraulic barrier (HB) for plumes containment is emplaced, compound-specific stable isotope\udanalysis (CSIA) has been applied for source apportionment, for investigating the relation between\udthe upgradient and downgradient of the HB, and to target potential CB biodegradation processes.\udThe isotope signature of all the components potentially involved in the degradation processes has been\udexpressed using the concentration-weighted average 13C of CBs + benzene (13Csum). Upgradient of\udthe HB, the average 13Csum of 25.6‰and 29.4‰were measured for plumes within the eastern\udand western sectors, respectively. Similar values were observed for the potential sources, with\ud13Csum values of 26.5‰for contaminated soils and 29.8‰for the processing water pipeline in\udthe eastern and western sectors, respectively, allowing for apportioning of these potential sources to\udthe respective contaminant plumes. For the downgradient of the HB, similar CB concentrations but\udenriched 13Csum values between 24.5‰and 25.9‰were measured. Moreover, contaminated\udsoils showed a similar 13Csum signature of 24.5‰, thus suggesting that the plumes likely originate\udfrom past activities located in the downgradient of the HB. Within the industrial property, significant\ud13C enrichments were measured for 1,2,4-trichlorobenzene (TCB), 1,2-dichlorobenzene (DCB),\ud1,3-DCB, and 1,4-DCBs, thus suggesting an important role for anaerobic biodegradation. Further\uddegradation of monochlorobenzene (MCB) and benzene was also demonstrated. CSIA was confirmed\udto be an effective approach for site characterization, revealing the proper functioning of the HB and\uddemonstrating the important role of natural attenuation processes in reducing the contamination\udupgradient of the HB

Compound-Specific Isotope Analysis (CSIA) Application for Source Apportionment and Natural Attenuation Assessment of Chlorinated Benzenes