Steven O. Helgen
Steven O. Helgen's headshot

Mr. Steve Helgen is a consultant specializing in geochemistry, hydrogeology, and environmental forensics. He has over 20 years of experience in contaminant fate and transport, geochemical fingerprinting, and apportionment in complex, multiparty environmental disputes involving sediments, groundwater, and industrial facilities. Mr. Helgen has provided expert testimony consisting of depositions, affidavits, and courtroom testimony in both state and federal court. He has developed and published apportionment methods that have proven instrumental in settlement negotiations and at trial. Mr. Helgen has successfully applied a number of geochemical forensic techniques to identify sources and determine the timing and quantity of releases. At industrial sites, he has performed site investigations, developed innovative remedial strategies, conducted soil gas assessments, performed isotopic studies, and determined the fate and transport of a variety of organic compounds including sulfolane, PCBs, 1,4-dioxane, solvents, coal tar, and perfluoroalkyl compounds such as PFOA and PFOS. For the mining industry, Mr. Helgen has led materials characterization studies and developed numerical models of sulfide oxidation, pit lake geochemistry, and metals behavior in stream sediments and groundwater.