Dr. Blayne Hartman received his Ph.D. in geochemistry from the University of Southern California. Since entering private industry, he has worked extensively with surface geochemical methods for environmental & exploration applications. He co- founded H&P Mobile GeoChemistry, a business partnership offering on-site laboratory analysis, direct push environmental sampling, soil vapor surveys, and vapor intrusion services, and is currently an independent consultant offering vapor intrusion and soil gas support.Dr. Hartman is a nationally recognized expert on soil vapor sampling, soil vapor analysis, and vapor intrusion. He has provided training on soil gas methods and vapor intrusion to County and State regulatory agencies in over 30 states, many of the EPA regions, the DOD, and numerous stakeholder groups and consultants. He has written numerous articles on the collection, analysis, and interpretation of soil vapor data, including chapters in four textbooks. He has participated in technical workgroups on soil vapor methods for EPA, CA-EPA, CA Regional Water Boards, County of San Diego, ITRC & ASTM and has reviewed/edited instructional manuals for the EPA OUST and Superfund groups. He is currently a trainer in the ITRC, ASTM, and API vapor intrusion cources. and lectured on soil gas methods in the EPA-OSWER vapor intrusion seminars. Over the past four years, Dr. Hartman has been a contributing author/editor to vapor intrusion and soil gas guidance documents to federal EPA, CA-EPA, San Diego County, ITRC, DOD, API, and more than 20 individual State documents