Document np1eOO7jqgYOqK6mryyGYKDeG

AUG f 0 B73 U.5. department OF LAnoa ' Oceupationil Safety artij Health Au'miniatraaon Washington, oc :c:jo M-. Dcna Meyer Engineer - Industrial Hygiene Engineering Department Louviers Building T E.I. du Pont de Nemours and Company Wilmington, Delaware 19898 Dear Ms. Meyers This is in reply to your inquiry regarding the interpretation of respiratory protection required by OSHA's asbestos' standard, 29 CFR 1210.1001 (c) (2) (ill) . Employees about to engage in the spraying off asbestos, in the removal or demolition of pipes,.structures, or equipment covered or insulated" with 'asbestos, or in the removal or demolition of asbestos insulation or coverings, shall be provided with and shall use a type "C" continuous flow or pressure-demand, supplied-air respirator. This requirement holds 'true unless the - employer has positively established in advance that the airborne concentrations of asbestos the employees will >nfront will ,,ot exceed 100 v.i:.:oz either cf the permissible exposure limits; i.e., 8-hour time-weighted average and' ceiling limits. ; If the employer has conclusively established the upper concentration of airborne asbestos that employees could confront during spraying, demolition or removal, then any of the respirators presented in 29 CFR 1910.1001 (d) (2) (i) , (ii) and (iii) that afford adequate protection at such ` upper concentration of airborne asbestos may be used. I trust that this answers your question, and confirms what Sincerely, Oi ovvi C. Wi ctm l)i ell (if, VVdiTal tind :.t .i t v fi v.pMra:: luncu \ OOP 0906822 ^*1 Method. / {/npl;on<. (31 W*4 frtliKIfc (III} t^iarluf, dam.lltl.n, at xnnal, Employed ene.-ii.-i-d in the sprayinc sf aibettos, the removal, or ileniulition of pipes, structures, or cnuipment csvereti or Insulated with asbestos, and in the removal or demolition of asbestos insula* lien er coverings shall be provided with respiratory equipment in accordance with poraeraph (tlKIXiii) of this section and with special clothing m accordaneo with paragraph (dX3) af this section. DUP 0906823 (d) Personal protective equipment. (1) Compliance wuh the nroiurr units ore Knbcd by paracrapn inm tins <u.m *ni not l*e achieved by the u*o of re- inratars or ihift nutien / mpie>rvs. exrcpu (T) During the time period necessary to install the engineerine tontruis and to institute t.he rs practices repuirud ay paragraph (e) of tins section; (II) In work situations In which the methods prescribed in paragrapn (e) of this section are either teenmeatly ns: feasible or feasible to an extent insuf ficient to reduce the airborne concentra tions of asbestos fibers seiow me limits prescribed by paragraph (b) of this sec tion: or (SI) In emergencies. (Iv) Where both respirators and personnel rotation are allowed by subdivisions ' (11), or (iiD of this luos--" enph. one :o:.-. are practicable, personnel rotation in... be preferred and used. (3) Where t respirator is permitted hy sub- paragraph (1) of this paracraan. it snail uc elected from among those aoproved by ire Bureau of Mints. r><oarim*r.t oi the Interior, or the National Institute for Occu pational Safety and Health. Department a! Health. Education, and Welfare, untiur the Srevisions of Id CFR Part ll ITT >ML 01-t-i. iar. IS, 1971), and snail be used in accordance with subdivision* m. <il). (ml. and (iv) of this suhp'traijrnph. . 01 Alt ewfifytnp r'e,,toM. A reusable or tingle use utr purifying respirator, or a respirator described in subdivision (iil or (iii) of this subparaerapn. shall be usod to reduee the conccntrat-nns of urcor-e Asbestos fibers in th resa.racer Lcto**' c**r exposure limits presertacu in a:.i (b) of this station. unci :rc ecu- r - ar \rc hour timc'wcsuftteu awp.u*** ursonc concentrations ot a*(K>ie* ubcri are reasonably expuetedto *xecwd no more than 10 times those limits. (irj Pswervd sir {ivriffinf ffitut'xt, A full fACCpieee powered air purii'yme respirator. or a powered air nurifymc re$p$ra!*r. er a r*.**:tr;ttor efeirribud tn subdivision (iii) ot tint Mjut.ir Jirruph, shots bo used toroUuo* the coucctumuan- of nirborne asbestos fibers in cite respirator belew Uiv vtno^utc prv- scribed in parauraph ibi c llm. Hcuin, when the eedim; or tin.* .vtumr ttrm** wri|?liied average runeem i :m.nis of Asbestos fibers are rr,iMi.iblv cxp*etrst to exceed 10 times, but not luO ttmiv, lliosc limits. (Hi) Tfpe -C* iVMniig( A U ! i tinuitui flow 1*1 | f f > W II t I* ll I* m ,l l.sl , Stl||*li*d .ut l (*'.(( .it oi Mill im* w .! In rriiiirr tlu* ci*m'i*iii.imi. .i .iMt...rio' A*lw*stt*4 tilmi . iii Ho* i* imi .i l i ! ei|MMIII* limit'. |b - >( III | i i i I t.'H (l>td llus-.t (ion, Mlifii tin ilior tii* Sliuiif Imim* Wfiifiitfl .s 11* i* iiiIhhim1 CftlKiMilr.itim . oi .r Im**.Iii . iil'i f t ,ii reosuti.iliir > ti i'U'ih'iI Jilt* Cum* i tlsuse l.mtla.