Paul Hadley is a Senior Hazardous Substances Engineer with the California Department of Toxic Substances Control in Sacramento, California. Since 1983 he has been an environmental engineer focusing on hazardous waste site cleanups. Paul has been an active member of ITRC since the organization’s inception in 1995. He has participated on or led teams on diverse subjects such as bioremediation of chlorinated solvents, risk assessment, and most recently incremental sampling, and served as the state-lead on the ITRC’s first classroom and Internet-based Training courses, both on the natural attenuation of chlorinated solvents. He has authored several papers on topics related to these and other subjects addressed by various ITRC technical teams. Paul earned a bachelor’s degree in biochemistry in 1977 and master’s degree in civil/environmental engineering in 1983, both from the University of California in Davis. Paul is a Registered Civil Engineer in California.