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Notice of Public Comment Period and Workshops on Draft Reference Exposure Levels for Ethylene Glycol Mono-N-Butyl Ether and Inhalation Cancer Unit Risk Factor for Tertiary-Butyl Acetate

The Office of Environmental Health Hazard Assessment (OEHHA) is releasing two documents for public review, one summarizing the toxicity and derivation of Reference Exposure Levels (RELs) for Ethylene Glycol mono-n-Butyl Ether (EGBE) and the other summarizing the carcinogenicity and derivation of an inhalation cancer unit risk factor (URF) for tertiary-Butyl Acetate (TBAc).  RELs are airborne concentrations of a chemical that are not anticipated to result in adverse non–cancer health effects for specified exposure durations in the general population, including sensitive subpopulations.  Inhalation cancer unit risk factors are used to estimate lifetime cancer risks associated with inhalation exposure to a carcinogen.

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).  In implementing this requirement, OEHHA develops RELs and URFs for many air pollutants.  The draft EGBE RELs were developed using the most recent “Air Toxics Hot Spots Program Technical Support Document for the Derivation of Noncancer Reference Exposure Levels,” finalized by OEHHA in 2008.  The draft TBAc inhalation cancer unit risk factor was developed using the most recent “Air Toxics Hot Spots Program Technical Support Document for Cancer Potency Factors,” finalized by OEHHA in 2009.

The draft EGBE REL and TBAc inhalation cancer unit risk factor documents are being made available today on the OEHHA website.  The posting of the document will commence a 60-day public review period that will end on October 13, 2015.  Public workshops will be held in Northern and Southern California at the following locations and times:

September 9, 2015
9:00 AM - 12:00 PM
Room CC-2
South Coast Air Quality Management District
21865 E. Copley Drive
Diamond Bar, CA 91765

September 14, 2015
1:30 PM - 4:30 PM
Sierra Hearing Room
Cal/EPA Building
1001 I Street,
Sacramento, CA 95812                                  

After the close of the public comment period, the documents will be revised as appropriate by OEHHA, and peer reviewed by the State’s Scientific Review Panel on Toxic Air Contaminants. 

Please direct your comments on the documents, in writing or by e–mail, and any inquiries concerning technical matters or availability of the documents to:

Dr. John Budroe
Chief, Air Toxicology and Risk Assessment Section
Air, Community, and Environmental Research Branch
Office of Environmental Health Hazard Assessment
1515 Clay Street, 16th Floor
Oakland, CA, 94612

E–mail: John.Budroe@oehha.ca.gov

Telephone: (510) 622-3145

Information about dates and agenda for meetings of the Scientific Review Panel can be obtained from the California Air Resources Board website.

Link to Public Comments

Wednesday, August 12, 2015