The Office of Environmental Health Hazard Assessment (OEHHA) has released an updated draft of the document, Air Toxics Hot Spots Program Technical Support Document For Exposure Assessment and Stochastic Analysis, to solicit public comment on the revised portions of the document. OEHHA is required to develop guidelines for conducting health risk assessments under the Air Toxics Hot Spots Program (Health and Safety Code Section 44360 (b) (2)). OEHHA previously developed Technical Support Documents (TSDs) in response to this statutory requirement, including one in 2000 for exposure assessment. This revised draft TSD is designed to replace the original TSD, and reflects new scientific knowledge developed since the previous guidelines were prepared. We have updated exposure parameters (e.g., inhalation rate, food consumption rate, etc.) based on the most recent data, including exposure factors for infants and children in accordance with the mandate of the Children’s Environmental Health Protection Act (Senate Bill 25, Escutia, Chapter 731, Statutes of 1999, Health and Safety Code Sections 39669.5 et seq.).
The public comment period on the updated draft of the Air Toxics Hot Spots Program Technical Support Document For Exposure Assessment and Stochastic Analysis has been extended to January 13, 2012.