ART staff evaluated local and regional groundwater flow models, and developed numerical models for simulating groundwater flow and contaminant fate and transport for several state and federal superfund Sites. The models were used to evaluate the effectiveness and the optimization of existing remediation systems for plume capture, design and evaluation of remedial alternatives for metals and petroleum and chlorinated hydrocarbon impacted sites, evaluate the cumulative hydrologic impacts of localized dewatering activities and pumping to sensitive ecologic receptors along the riparian corridors and wetlands, and design and evaluate the feasibility and effectiveness of dewatering alternatives and mitigation control measures, such as a levee and sub-drain system, during a simulated design flood for a proposed housing development.