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ab2588 -- Proposed Revisions to the Air Toxics Hot Spots Program Non Cancer Risk Assessment Methodology Posted: 02 Nov 2007 13:53:08
OEHHA is releasing a draft document, Air Toxics Hot Spots Program Technical Support Document For the Derivation of Noncancer Reference Exposure Levels to solicit public comment. 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 two (in 1999-2000) which described acute and chronic Reference Exposure Levels (RELs). This revised draft TSD is designed to replace those original TSDs, and presents methodology revised to reflect scientific knowledge and techniques developed since the previous guidelines were prepared, and in particular to explicitly include consideration of possible differential effects on the health of infants, children and other sensitive subpopulations, 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.). In addition to the previously defined acute and chronic RELs, the new method allows for the estimation of 8-hour RELs, which may be useful in dealing with some special circumstances in Hot Spots risk assessments. The revised draft also contains proposed Reference Exposure Levels for six chemicals (acetaldehyde, acrolein, arsenic, formaldehyde, manganese, and mercury), which illustrate the intended use of the new guidelines as well as updating the health protective levels for these compounds. We invite comments on this document (including the RELs), in particular on the revisions to the existing approved methodology, and the appropriateness of the revised methodology to protect infants and children and other sensitive subpopulations. Following this public comment period, the document and any comments received, along with OEHHA’s response to those comments, will undergo review by the state’s Scientific Review Panel on Toxic Air Contaminants. The draft document is available on the OEHHA Home Page at http://www.oehha.ca.gov/air/hot_spots/crnr110207.html This will commence a 60-day public review period that will end on January 2, 2008. Please send written comments on the document to: Dr. Andrew G. Salmon: Chief, Air Toxicology and Risk Assessment Unit Office of Environmental Health Hazard Assessment E-mail: email@example.com Regular mail: 1515 Clay St., 16th Floor, Oakland, CA 94612. Public workshops will be held as follows: November 30th, 2007: 10.00 am – 4.00 p.m South Coast Air Quality Management District GB Room, 21865 Copley Dr, Diamond Bar, CA 91765 and December 7th, 2007: 10.00 am – 4.00 p.m. State of California (Oakland offices) Room 12, Elihu Harris Building, 1515 Clay St., 2nd Floor, Oakland, CA 94612 Please direct technical inquiries and other questions about the document or workshops to Dr. Salmon (address as above or telephone 510 622 3191) Information about dates and agenda for meetings of the Scientific Review Panel can be obtained from the ARB web page at http://www.arb.ca.gov/srp/srp.htm.