Tad Fox, PG, is a Principal Scientist at HydroGeoLogic with more than 24 years of experience managing and conducting hydrogeologic investigations at industrial, DoD, and DOE sites. He specializes in 3D geospatial modeling, numerical modeling and optimization, and hydrogeologic evaluations. He has employed numerical models to support remedial process optimization, risk assessment calculations, alternatives evaluation and remedy selection, capture zone analyses and to develop performance monitoring plans. Fox has utilized 3-D volume modeling to estimate the volume of contaminants in the subsurface, to integrate field data within a consistent framework, and to present modeling results to clients, regulatory agencies, and concerned citizens.