A groundwater model was developed to address corrective actions under the WDEQ to provide an understanding of remedial alternatives to prevent off-site migration of contaminated groundwater and LNAPL. A three-dimensional finite-difference groundwater model was used to assist with the design and placement of a groundwater interceptor trench. The model utilized detailed subsurface characterization to simulate aquifer layers of various permeability to represent bedrock, sand/gravel and clay zones. The model was also used to simulate existing pumping systems, planned and existing interceptor trenches, wastewater ponds, as well as, creeks. Visual MODFLOW was used to generate the model, which works in conjunction with mapping programs to generate groundwater maps which can be incorporated into technical documents.