Document 9X8RYO5R9JoLZZ94MLZ0X0Kq

FILE NAME: JH DATE: 1975 Mar 18 DOC#: JH001 DOCUMENT DESCRIPTION: Letter from J-M to James Hardie RE OSHA & MESA Standards ! life ' li .Denver, Colorado 80217 Hoalth.Safoty 4 Environment Dopartmont March 18, 1975 f^B$Pvv fffi- i ^ S. F. McCullagh, M.D. James Hardie & Coy PTY. Ltd. Research & Engineering Centre Box 219, P.0. Granville New South Wales, Australia 2142 Dear Dr. McCullagh: Dr. George Wright has asked me to reply to your letter of March 11, 1975, relative to our OSHA and MESA standards. The Office of Health Standards in 0SI1A presently is revV iewing anId ^prA* obably rewriting portions of the present 1" ~,V"`,' asbestos standard tchnatu was promuil.gated on June 7, 1972. We r.7^ are U hopeful1 tha-ltl* they 4-U r\t / Mwii ll ll not 1lowerV* 4t- hK e^ f>u'lture 2 fibers per milliliter TWA maximum allowable concentration, We anticipate that if this allowable level is retained, its implementation date will be moved forward to between July 1, 1975 and January 1, 1976. Our Mine Enforcement and Safety Administration chose' to adopt airborne fiber levels from the OSHA emergency standard of December 12, 1971. There is little difference between-, the two> standards except that t"he MESA st`andard, as you letter indicates, specifies the.maximum time period and - ^ maximum number of occurrences for exposures up to the ceiling concentration of 10 fibers .per. cc-and i-ddes propose ";av'2 fiber per :millillHer 'lievel -in-the future MESA has'Jhot vindicated whether or not ..they ipl-ari:;>later adopt th'>;lwer'-fiber level.;y;in';-.my'o]pinioni^theyXi^il I f 'they there :will:;be 'two;:'standardsif^ Asbestos .vmin'es ;and .mills are under the iurisdietibh `of ,::MESA MT004836