Comment submitted by G. Valasek

ENVIRONMENTAL PROTECTION AGENCY Docket ID No. EPA-HQ-OAR-2005-0526 National Emission Standards for Hazardous Air Pollutants: Paint Stripping and Miscellaneous Surface Coating Operations at Area Sources Publication: Federal Register, [Proposed Rules] September 17, 2007 (Volume 72, Number 179), pages 52957-52982 Ladies and Gentlemen of the EPA: 9/28/07 It was interesting and informative to review the subject proposed rule intended for 40 CFR Part 63. Since society deals with many chemicals nowadays, it would seem to be beneficial if the U.S. Environmental Protection Agency would provide the CAS Registry Number of any chemical that it regulates so that searching for its information becomes more readily available. Methylene Choride has the CAS Registry Number of 75-09-2. There doesn't appear to be any reason not to include this number for easier cross-reference to additional information on this chemical. It would be most welcomed by the scientific community to hereafter include this valuable key for researchers as well as the general public to enhance our informational capabilities about chemicals in our environment. Chemical Abstracts Service (CAS), the global leader in chemical information, and a division of the American Chemical Society, provides the most comprehensive databases of publicly disclosed research in chemistry and related sciences, including the world's largest collection of substance information, the CAS REGISTRY. If you have need to contact CAS for any inquiries, try their mailing address: Chemical Abstracts Service P.O. Box 3012 Columbus, Ohio 43210 U.S.A. or street address: Chemical Abstracts Service 2540 Olentangy River Road Columbus, OH 43202 U.S.A. or, otherwise, by phone: 800-848-6538 (North America), 614-447-3600 (worldwide); Fax: 614-447-3713; E-mail: help@cas.org or their feedback form at http://info.cas.org/forms/feedback.html . Cordially submitted, Gary Valasek Cincinnati, Ohio gvalasek@juno.com