title: Evaluation of the potential for the natural attenuation of hexavalent chromium within a sub-wetland ground water.
abstract: In this work, the potential for natural attenuation (NA) of Cr(VI) is evaluated for sub-wetland ground water at a chromium-contaminated site in Connecticut, incorporating the experimental findings of previous work at the site. Experimental data is assessed through long-term attenuation capacity calculations and modeling, which incorporates statistical uncertainty of parametric values. The NA evaluation yielded the following results: (1) Significant increases in Cr(VI) concentration and extremely long chromium source dissolution timeframes are required to exceed the attenuation capacity of the sub-wetland region soils studied in this work; and (2) Based on the 1-D transport modeling and incorporating input parameter uncertainty, there is an approximately 92% and 98% probability that the applicable regulatory criteria will not be exceeded at Point C, near a river which serves as the receptor, for the cases of (1) sorption of Cr(VI) only and (2) pseudo first order disappearance of Cr(VI) from the aqueous phase only, respectively.
authors: Environmental Engineering Program, University of Connecticut, Storrs, CT 06269-2037, USA. lucas.hellerich@m-e.aecom.com
authors: Lucas A
authors: LA
authors: Hellerich
authors: Nikolaos P
authors: NP
authors: Nikolaidis
authors: Gregory M
authors: GM
authors: Dobbs
mesh_terms: D002857:Chromium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D053833:Wetlands
chemical_list: D014874:Water Pollutants, Chemical; D002857:Chromium