Notice of Public Comment/Workshops for the Draft Technical Support Document for Exposure Assessment and Stochastic Analysis Nov 2011

The Office of Environmental Health Hazard Assessment (OEHHA) is releasing an updated draft of the document, Air Toxics Hot Spots Program Risk Assessment Guidelines: 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 will 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 revised draft also updates the approach to assessing dermal exposure. 

We are seeking comments on the revisions to the existing approved methodology for dermal exposure and the revised exposure parameters.  Following this public comment period, the document and any comments received, along with OEHHA’s responses to these comments, will undergo review by the state’s Scientific Review Panel on Toxic Air Contaminants.

The draft document will be available on the OEHHA Home Page at on November 7, 2011A 60-day public review period commences on November 7, 2011, and will end on January 6, 2012.

Public workshops will be held at 10:00 a.m. – 2.00 p.m. on December 20, 2011 in Diamond Bar and 10:30 a.m. – 2.30 p.m. on December 22, 2011 in Oakland.  Location information is as follows:

Meeting Locations

Room  CC2
South Coast Air Quality Management District
21865 Copley Dr,
Diamond Bar, CA 91765

Room 7,
Elihu Harris Building
1515 Clay St., 2nd Floor
Oakland, CA 94612

Please direct any inquiries concerning technical matters or availability of this document to OEHHA staff at (510) 622-3200.

Please direct your written comments to:

Office of Environmental Health Hazard Assessment

1515 Clay St., 16th Floor

Oakland, CA 94612