Document pp5DdyBYkxg5m56DprvL9jpzB

DON'T SAY IT -- WRITE IT Daceatar 16,______________________19JI TO. Mr. L. 0. CllTer TOM. J. A. McGee siia.iFf.T? OSHA Standard, 1910-9BA - Aabeatoa Diet ___________ The only area In which mb may hare a problem la la tha cauatlc ehlorlna ahop In the Sodium. It la raco--andad that technical aaalatanee be requeated to detaralne If a problaa axlata.___________________________ J. A. McGee ee: Mr. 3. A. D'Araond BR> 429 rev. 3/64 ETC 15602 E-00339 2:1208 RULES AND REGULATIONS As amended. Table G-3 reads as follows: ^ Tablk 0-3--Miseral bt'STS Substance Mppcf Mg/M* f iiU'Sl Crystalline: Quartz (respirable).............. 2501 lOmg/M* %S10rfS C^jOj+S Quartz (total dust)................................... 30idr/M* Cristoballte: Use M the Tiiluc calculated from the count or mass formula* for quartz. Tn<l\Tuie: Use M the value calculated front the for* mulae for quartz. Amorphous. Including natural diatomaccous earth............... 5t*ciOi+2 20 SOmg/M* ^rSiOj Silicr.tcj (le.ss than \% crys- . talline silica): Mica...................................... Soapstone............................. T;.lc....................................... Portland cement.................. (iranhlte (natural).................. Coal dust (respirable fraction less than 5% SlOd-............ For more than 6% SiOt.......... 20 20 20 5106 .... 2.4me/M* or .... lOing/M* Inert or Nuisance Dust: Respirable fraction... Total dust.................... %SiO*+2 16 Bmg/M1 60 15mg/M* Note: Conversion factors-- mppcfXl5.3- million particles per cubic meter particles pcrc.c. Millions of particles pcr cubic foot of air, based on lznpinger samples counted by light-field technics. The percentage of crystalline silica in the formula Is the'amount determined from air-borne samples, ex cept in those instances in which other methods have been shown to be applicable. < As determined by the membrane Alter method at 430Xphase contrast magnification. Doth concentration and percent quarts for tho apdU* cal ten of this limit ore to be determined from the fraction passing a size-selector with the following characteristics: Aerodynamic diameter (unit density sphere) ' Percent passing selector 2 00 2.6 78 3.8 60 5.0 28 10 0 The measurements under this note refer to the use of an ARC instrument. If the respirable fraction of coal dust Li determined with a M RE the figure corresponding to that of 2.4 Mg/M* in the table for coal dust is 4A Mg/M} 2. A new { 1910.93a Is added to Part 1910. The new {1910.93a reads as follows: .* 1910.93a Asbcsloi dust. (a) The 8-hhur time-weighted aver age airborne concentration of asbestos dust to which employees are exposed shall not exceed 5 fibers per milliliter greater than 5 microns in length, as de termined by the membrance filter method at 400-450 x magnification (4 millimeter objective.) phase contrast illumination. Concentrations above 5 fibers per milliliter but, not to exceed 10 fibers per milliliter, may be permitted up to a total of 15 minutes in an hour for up to 5 hours In an 8-hour day. . (b) Engineering methods, such as but -not limited to. enclosure, vacuum sweep, ing, and local exhaust ventilation, shall be used to meet the exposure limits pre comply with the requirements of there scribed in paragraph (a' of this section. subparagraphs relating to the operations Where such engineering methods are not involved. The requirements of this para- feasible, or do not otherwise reduce the .Tnv:'.! arc in addition io those proscribed concentrations below tho-e prescribed in in paragraph i b) of this section. paragraph (a) f tliis section, respira (L' A'.t.hand- or piiwcr-onerated tools - tory protective devices shall be provided wnicli produce asbest.w dust such as, but and used in accordance with paragraph not `itv.ited to, tav.s. scorers, abrasive (c) of this section. wheels, and drills shall be provided with (c) (1) (i) When the limits of ex local exhaust ventilation and dust col posure to asbestos dust prescribed in lectors in accordance wish the American paragraph (a) of this section are ex National Standard fundamentals Gov ceeded and when engineering controls erning the Design end Operation of T^cal required by paragraph (b > of this section Exhaust Systems; ANSI Z3.2--1971. are not feasible or do not otherwise re duce the concentration of asbestos dust below those prescribed in paragraph (a) of this section, the employer shall re quire the use of respiratory protective de vices. The selection of respiratory protective devices shall be limited to those specified in the remaining subparagraphs of this paragraph (c). <ii) The employer shall require that each employee test his respiratory pro tective device before each use in order to insure a proper fit according to the manufacturer's instructions. The em (3) Employees exposed to the spraying of asbestos or the demolition of pipes, structures, or equipment covered or in sulated with asbestos shall be provided .with respiratory protective devices in accordance with paragraph (eld) of this section. (e) Asbestos cement, mortar, coatings, grout, and plaster shati be mixed in closed bags or other containers. (f) Asbestos waste and scrap shall be collected and disposed of In sealed bags or oh. ier containers. ployer shall further provide for effective (g) AH cleanup of asbestos dust and training or supervision of employees In blowing shall be performed by vacuum the testing of respiratory protective de cleaners. No dry sweeping shall be per vices for fit beforerjthcir use. formed. (2) For an atmosphere containing not 3. Section 1910.12 is amended by more than 25 fibers per milliliter greater chancing paragraph (a) in order to apply than 5 microns in length over an 8-hour the emergency standard prescribed in the average, or more than 50 fibers per milli new 1910.93a, which is published in this liter over any period of 15 minutes, a document, to construction work which Is reusable or single-use filter type respira subject to the Act. The amendment Is tor, operating with negative pressure necessary in light of the rule of regula during the inhalation phase of breathing, tory construction set forth in 1910.5(c). approved by the U.S. Bureau of Mines \s amended, 1910.12 reads as follows; under the provisions of 30 CKR Part 14 (Bureau of Mines Schedule 21B), or a jj; 1910.12 Construction work. valveless respirator providing equivalent (a)(1) Adaption and extension of es protection, shall be used. tablished safety and health standards (3) For an atmosphere containing not for construction. The standards pre more than 250 fibers per milliltcr greater scribed by Part 1513 of this title and In than 5 microns in length over an 8-hour effect on April 28, 1971, are adopted cs average, or more than 500 fibers per occupational safety or health standards milliliter over any period of 15 minutes, under section 6(a; of the Act and shall a powered filter positive pressure res apply, according to the provisions pirator approved by the U.S. Bureau of thereof, to every employment and place Mines under the provisions of 30 CFR of employment of every employee en Part 14 (Bureau of Mines Schedule 21B) gaged in construction work. Each em shall be used. ployer shall protect the employment and (4) For an atmosphere containing places of employment of each of his more than 250 fibers per milliliter employees engaged in construction work greater than 5 microns in length over by complying with the appropriate an 8-hour average a type C positive pres standards prescribed by this paragraph. sure supplied-alr respirator approved by the VJS. Bureau of Mines under the pro visions of 30 CFR Part 12 (Bureau of Mines Schedule 19B) shall be used. (5) The employer shall establish a respirator program in accordance with the requirements of American National Standard Practice for Respiratory Pro tection Z88.2--1969. (6) The respirators provided each em ployee shall be properly inspected, ) The standards prescribed In } 8.55(c) of this title shall apply In ' *:. lease of the exposure of any emplv ve in construction work to airborne o.y v.ytos dust. SJective date. These amendments sl .rl become effective immediately upon Du'.lication in the Federal Register (If-7-71). cleaned, repaired and stored. (See. 6(c), 94 Stat. 1596. 29 UJS.C. 655: Sec (d) (1) When an employer has em retary's Order No. 12-71,36 F.R. 8754) ployees who are exposed to asbestos dust Signed at Washington, D.C., this 2d - exceeding the limits prescribed In para day of December 1971. graph (a) of this section and the ex posure results from the operations de scribed In the remaining subparagraphs . G. C. Guenther, Assistant Secretary of Labor. of this paragraph (d), the employer shall [FRDoc.71-17833 Hied 12-6-71:6:47 am) FEOERAl REGISTER, VOL 36, NO. 234--TUESDAY, DECEM6E8 7, 1"71 ETC 15603 E-003AO