Notice of Intent to List: Methazole and Tributyltin Methacrylate

Oct 1, 1999

The Safe Drinking Water and Toxic Enforcement Act of 1986 (Proposition 65) provides two mechanisms for administratively listing chemicals which are known to the State to cause cancer or reproductive toxicity (Health and Safety Code Section 25249.8(b)). One such mechanism by which a chemical may be listed is if a body considered to be authoritative by the state’s qualified experts has formally identified it as causing cancer or reproductive toxicity. The following are identified as authoritative bodies for purposes of Proposition 65 as it pertains to chemicals known to cause reproductive toxicity: the U.S. Environmental Protection Agency (U.S. EPA), the International Agency for Research on Cancer (for transplacental carcinogenicity only), the U.S. Food and Drug Administration, and the National Institute for Occupational Safety and Health. The criteria for listing chemicals through the authoritative bodies mechanism are set forth in Title 22, California Code of Regulations (22 CCR), Section 12306.

As the lead agency for the implementation of Proposition 65, the Office of Environmental Health Hazard Assessment (OEHHA) of the California Environmental Protection Agency intends to list the chemicals identified below as known to the State to cause reproductive toxicity, pursuant to this administrative mechanism as provided in Health and Safety Code Section 25249.8(b) and 22 CCR, Section 12306.

Relevant information on tributyltin methacrylate (CAS No. 2155-70-6) and methazole (CAS No. 20354-26-1) was requested in the notices published in the California Regulatory Notice Register on July 9, 1999 and July 16, 1999, respectively. A public forum was held on August 31, 1999. OEHHA has determined that tributyltin methacrylate and methazole meet the criteria for listing under 22 CCR, Section 12306. OEHHA is issuing this notice of intent to list for tributyltin methacrylate and methazole. A document providing more detail on the basis for the listing of these two chemicals can be obtained from OEHHA’s Proposition 65 Implementation Office at the address and telephone number indicated below, or from the OEHHA Home Page. Anyone objecting to the listing of tributyltin methacrylate and methazole as causing reproductive toxicity on the basis that there is no substantial evidence that the criteria of sufficiency of evidence of reproductive toxicity identified in 22 CCR, Section 12306 have been satisfied should provide written comments in triplicate, along with supporting documentation, by mail or by fax to:

Ms. Cynthia Oshita
Office of Environmental Health Hazard Assessment
Post Office Box 4010
Sacramento, CA 95812-4010

Fax No.: (916) 327-1097
Telephone: (916) 445-6900

Comments may also be hand-delivered to Ms. Oshita at the Office of Environmental Health Hazard Assessment, 1001 I Street, Sacramento, California.

In order to be considered, comments must be postmarked (if sent by mail) or received at OEHHA (if delivered in person or sent by FAX) by 5:00 p.m. on Monday, November 1, 1999.

The following chemicals have been determined by OEHHA to meet the criteria set forth in 22 CCR, Section 12306 for listing as causing reproductive toxicity under the authoritative bodies mechanism:

Chemical	CAS No.	Toxicological Endpoint	Reference^a
Methazole	20354-26-1	developmental toxicity	U.S. EPA (1994a,b)
Tributyltin methacrylate	2155-70-6	developmental toxicity	U.S. EPA (1994a,b)

^aFormal identification by U.S. EPA of chemicals causing reproductive toxicity is provided in U.S. EPA (1994b) below, while additional information on the basis for such identification is provided in U.S. EPA (1994a).

Footnotes and References

References
US Environmental Protection Agency (US EPA, 1994a). Proposed Rule: Addition of Certain Chemicals; Toxic Chemical Release Reporting; Community Right to Know. Federal Register (59 FR 1788).

US Environmental Protection Agency (US EPA, 1994b). Final Rule: Addition of Certain Chemicals; Toxic Chemical Release Reporting; Community Right to Know. Federal Register (59 FR 61432).