MARV HYMAN, PE, CIH, MS Chemical Engineering U.C. Berkeley, BS Caltech, has over 30 years experience in environmental engineering, alternative energy and industrial safety, and since 1994 has been working with Bechtel on remediation of soil, groundwater and tank wastes contaminated with organics, metals, and radioisotopes at Hanford, Washington. He is the author of the remediation article in the Wiley Encyclopedia of Environmental Analysis and Remediation (1998), and principal author of the ASCE Press book Groundwater and Soil Remediation: Process Design and Cost Estimating (2001). He is the remediation instructor in the continuing education programs of the American Institute of Chemical Engineers, American Industrial Hygiene Association, U.C. Berkeley Extension, and Washington State University.

TYLER E.GASS has approximately 30 years of experience as a Hydrogeologist focusing on a variety of environmental issues, as well as ground-water resource evaluation and development. Mr. Gass is a former Director of Research of the National Ground Water Association, and is a member of the U.S. Army Science Advisory Board, where he is the former Chairman of the Infrastructure and Environment Subcommittee. Mr. Gass has published numerous articles and has co-authored two textbooks on groundwater development, resource protection, and the fate and transport of chemicals in the subsurface environment. He has been an expert witness in a number of federal and state courts, and has testified on subjects related to groundwater flow, aquifer analysis, contaminant fate and transport, groundwater remediation and groundwater natural resource damages.