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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
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: asalmon@oehha.ca.gov 
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
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

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