It is for these reasons that analytical models for groundwater flow and contaminant transport are gaining increasing popularity over complex numerical models for evaluating the completed exposure pathways associated with groundwater contamination plumes. These results were used in the the risk assessment to evaluate the risks in terms of toxicity and to develop reasonable maximum exposure levels. The results indicated that there was no unacceptable risks posed by the residual groundwater contamination at the site and that natural attenuation was a feasible remedial action alternative. The State Water Control Board concurred with the recommendation and the project was closed out. In addition it also includes sample tutorials for each model.
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