MD&E developed a series of regional- and local-scale models to simulate hydrodynamics within shallow (near surface) sediments in the northeast quadrant of the Great Salt Lake basin. The purpose of the modeling efforts is to evaluate a variety of natural and anthropogenic factors controlling groundwater flow and contaminant transport patterns at a chemical plant in Salt Lake City, Utah. The models are also to be used to aid the design and engineering of in-situ treatment processes to address site impacts.