Dr. Valerie Hanley is a Staff Toxicologist in the Human and Ecological Risk Office at the California Department of Toxic Substances Control (DTSC) in Sacramento, CA. Valerie has been with DTSC since 2008. She recently authored a Human Health Risk Assessment Note on how to evaluate Arsenic contaminated sites with a specific emphasis on how and when to use bioavailability in those site evaluations. Valerie has been involved in the study of arsenic bioavailability since 2009 when DTSC was awarded funding from US EPA to evaluate and develop new methods to determine arsenic bioavailability in mining soils. Through this work Valerie helped develop the California Arsenic Bioaccessibility (CAB) Method, which is now recommended for use in sites throughout California. Valerie joined the ITRC Bioavailability in Contaminated Soils Team in 2015 and is one of the lead authors on the arsenic chapter of the document. In addition to her work on arsenic, Valerie evaluates Human Health Risk Assessments for a variety of sites and is involved in DTSC's Safer Consumer Products program. Valerie earned a Bachelor's degree in Molecular, Cellular, and Developmental Biology from The University of California (UC) Santa Cruz in 2001 and her PhD in Comparative Pathology from UC Davis in 2007. She completed a postdoctoral fellowship at UC Davis in Respiratory Toxicology in 2008.