Stephen Richardson, Ph.D, P.E., P.Eng

Principal Engineer


SDRsm Dr. Richardson is a Principal Engineer and Vice-President with GSI Environmental Inc. and has 22 years of combined academic and consulting experience in soil and groundwater remediation, environmental site investigation, engineering design, and research and development. Dr. Richardson specializes in the application of innovative strategies and technologies to treat a variety of conventional and emerging contaminants including chlorinated solvents, per- and polyfluoroalkyl substances (PFAS), 1-4-dioxane, metals, polycyclic aromatic hydrocarbons (PAHs), and petroleum hydrocarbons in soils and groundwater. His professional experience includes site assessments of former manufactured gas plants, military bases, Superfund sites, gas stations, and oil and gas refineries; design and implementation of in-situ and ex-situ remedial technologies; treatment of non-aqueous phase liquid (NAPL) source zones; long-term monitoring optimization; stormwater assessments; performance-based remediation; and pre- and post-drill sampling program in areas of oil and gas development.

Dr. Richardson has authored or co-authored over 15 peer-reviewed journal articles on topics including dissolved methane occurrence and baseline groundwater sampling in areas of oil and gas development; in situ bioremediation of chlorinated solvent DNAPL; chemical oxidation, cosolvent flushing and bioavailability of PAHs, and decentralized wastewater treatment. He serves as a technical reviewer for several environmental journals and is a member of two Interstate Technology and Regulatory Council (ITRC) teams: i) remediation management of complex sites and ii) evaluation of innovative methane detection technologies. Dr. Richardson serves as principal investigator for several Department of Defense-sponsored research projects on cometabolic biodegradation of 1,4-dioxane, innovative approaches for treatment of chlorinated solvents in low permeability zones, and anaerobic bioremediation of DNAPL.

Practice Areas