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Air Toxicology and Epidemiology

Proposed Reference Exposure Levels For Methylene Diphenyl Diisocyanate, Toluene Diisocyanate And Caprolactam: Announcement Of Public Workshops
[06/02/10]

Comment Period Extended - Proposed Revised Reference Exposure Levels For Toluene Diisocyanate And Methylene Diphenyl Diisocyanate
[06/17/10]

The Office of Environmental Health Hazard Assessment (OEHHA) is soliciting public comments on draft documents describing proposed Reference Exposure Levels (RELs) for methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI) and caprolactam. 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 response to this statutory requirement, OEHHA in 2008 adopted a Technical Support Document (TSD) that contains updated guidelines for the development of acute, 8 hour, and chronic RELs. OEHHA recently described the derivation, using these guidelines, of proposed RELs for MDI, TDI and caprolactam, and invited public comments on these. The draft documents are available on the OEHHA web site at: http://www.oehha.ca.gov/air/chronic_rels/RELS042310.html (MDI and TDI) and http://www.oehha.ca.gov/air/chronic_rels/052010REL.html (Caprolactam). Written public comments are due by June 22 (MDI and TDI) and July 6, 2010 (caprolactam).

As part of the public comment process, OEHHA has arranged two public workshops on these documents that will be held at 9.00 a.m. – 12.00 p.m. on June 15 in Diamond Bar and at 9.00 a.m. – 12.00 p.m. on June 22, 2010 in Oakland. Location information is as follows:

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

Room 9
Elihu Harris Building
1515 Clay St., 2nd Floor
Oakland, CA 94612

Please direct any inquiries concerning the workshops, or on the technical aspects or availability of the documents to:

Dr. Andrew G. Salmon
Chief, Air Toxicology and Risk Assessment Unit
Office of Environmental Health Hazard Assessment
1515 Clay St., 16th Floor
Oakland, CA 94612

E-mail: Andy.Salmon@oehha.ca.gov
Telephone: (510) 622-3191