title: NAPL source zone depletion model and its application to railroad-tank-car spills.
abstract: We developed a new semi-analytical source zone depletion model (SZDM) for multicomponent light nonaqueous phase liquids (LNAPLs) and incorporated this into an existing screening model for estimating cleanup times for chemical spills from railroad tank cars that previously considered only single-component LNAPLs. Results from the SZDM compare favorably to those from a three-dimensional numerical model, and from another semi-analytical model that does not consider source zone depletion. The model was used to evaluate groundwater contamination and cleanup times for four complex mixtures of concern in the railroad industry. Among the petroleum hydrocarbon mixtures considered, the cleanup time of diesel fuel was much longer than E95, gasoline, and crude oil. This is mainly due to the high fraction of low solubility components in diesel fuel. The results demonstrate that the updated screening model with the newly developed SZDM is computationally efficient, and provides valuable comparisons of cleanup times that can be used in assessing the health and financial risk associated with chemical mixture spills from railroad-tank-car accidents.
authors: Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
authors: Amanda
authors: A
authors: Marruffo
authors: Hongkyu
authors: H
authors: Yoon
authors: David J
authors: DJ
authors: Schaeffer
authors: Christopher P L
authors: CP
authors: Barkan
authors: Mohd Rapik
authors: MR
authors: Saat
authors: Charles J
authors: CJ
authors: Werth
mesh_terms: D004784:Environmental Monitoring; D052918:Environmental Restoration and Remediation; D015386:Hazardous Substances; D008962:Models, Theoretical; D059392:Petroleum Pollution; D011890:Railroads
chemical_list: D015386:Hazardous Substances