Evaluation of the potential for the natural attenuation of hexavalent chromium within a sub-wetland ground water.
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.
Hellerich
Lucas A
LA
Environmental Engineering Program, University of Connecticut, Storrs, CT 06269-2037, USA. lucas.hellerich@m-e.aecom.com
Nikolaidis
Nikolaos P
NP
Dobbs
Gregory M
GM
D002857:Chromium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D053833:Wetlands
D014874:Water Pollutants, Chemical; D002857:Chromium