Document kmBXXmgE2rjk5knzBeLbV0vMb

Texas City, Texas r amended Part 1910. 93a on asbestos dust by providing idard dealing with, the exposure of employees to asbestos The 8-hour time-weighted average airborn concentration ) which employees are exposed shall not exceed 5 fibers iter than 5 microns in length. " When these limits mgineering methods (we are probably above these limits ;awing and during most field tear-out work), "respiratory shall be provided and used. " limit is a reduction from the previous 12 fiber limit .cations are that the present limit will be lowered to year. Whatever the final fiber limit, there are other ' that we must also meet. Enclosed is a copy of the and my suggestions for compliance which you requested our consideration: )cal exhaust ventilation around the band saw located Jntil this can be accomplished and air sampling and conducted, require personnel in the area to wear otection when the saw is in operation. ist collection system for the band saw. Thrash, I are scheduled to look at Carbide's installation for ner must be provided for the shop and probably for :ired cleanup work. The law states, "All cleanup st and blowing shall be performed by vacuum cleaners, ng shall be performed. " _ bestos disposal system whereby "asbestos waste and collected and disposed of in sealed bags or other Placing the sealed containers in the Dempster Dumpin be adequate. otection should be required for mixing of asbestos 6113 23834 April 18, 1972 ved by the U. S. by all employees at is setting up a We will be ment, collect iting. We should it work out, we our own counting. *N\i, 6113 23835 644 OCCUPATIONAL SAFETY & HEALTH REPORTER ^Part 1910 is amended as follows: j ejjy total of 15 minuvb's hi' anhpurrfor -Ma to o' iibUTS'In-an 8-iiour' day. scribed in the remaining subparagraphs of this paragraph (d), the employer shall (b) Engineering methods, such as but not limited to. enclosure, vacuum sweep comply with the requirements of these subparagraphs relating to the operations ing, and local exhaust ventilation, shall involved. The requirements of this para be used to meet the exposure limits pre graph are in addition to those prescribed scribed in paragraph (a) of this section. in paragraph Co) of this section. Where such engineering methods are not (2>-AU hand--cr power-operated tools As \amended, Table G-3 reads as follows: j \ Table G-3--Mineral Dusts^- feasible, or do not otherwise reduce the which produce asbestos dust such as. but concentrations below those prescribed in not limited to, saws, scorers, abrasive paragraph (a) of this section, respira wheels, and drills shall bo provided with tory protective devices shall be provided local exhaust ventilation and dust col ubstanco Mppcf / Mg/M' and used in accordance with paragraph lectors in accordance with the American Cc) of this section. National Standard Fundamentals Gov (c)(1) (i) 'WHcntEe" limits "bf'~ex- erning the Design and Operation of Local Silica: \ Crystalline: \ Quartz (respirable). Quartz (total'dust)............. Cristobalite: Use >5 the ralue calculated-(rom tho count or mass formulae for quartz. \ Tridymite: Uso 1$ the valuo calculated from the for mulae for quartz. \ Amorphous, Including natural dtatomaceous earth...V Silicates (less than. 1% cr; talline silica): Mica................ ... Soapstone....... 1.. Talc...................... Portland cement. Graphite (natural)........... ...... lOmc/M* %SiOi+2 30mc/M* ~%SiOz+2 80mg/M* %SiO: pesure--to " asb'estes ;dust/- prescribed in Exhaust Systems; ANSI Z9.2--1971. paragraph (a) of tiiis section are ex (3) Employees exposed to the spraying' ceeded and when engineering controls of-.asbastos qr the demolition of pipes, required by paragraph (b) of this section structures,.or. equipment covered or in-' are not feasible or do not otherwise re sulated with asbestos shall bo provided duce the concentration of asbestos dust with respiratory protective devices in below those prescribed in paragraph (a) accordance with paragraph (c) (4) of of this section!-the "employer ;$h?.ll.;re- this section. -quire'the use of respiratory protective de-" -vices;: Tire 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 (e) .Asbestos cement, mortar,"'coatings'! grout, and plaster shall be mixed in closed bags or other containers. (f) Asbestos \ vste and scrap shall be collected and disposed of in sealed bags or other containers. tective device before each use in order <g) All cleanup of; asbestos dust and to insure a proper fit according to the blowing shah be performed by vacuum manufacturer's instructions. The em cleaners. NC^dry sweeping shall.be per-- ployer shall further provide for effective formed. '*" Coal dust (respirable fraction \ less than 5% SiO:)y...........L----- 2.4nig/M* or training or supervision of employees in j. Section 1910.12 is amended by the testing of respiratory protective de changing paragraph (a) in order to apply For more than >/c SliOOi:...~........a. I0iag/M3 vices for fit before their use. the emergency standard prescribed in the Inert or Nuisanceee 1Dust: Respirable fractlioorn. Total dust. lix t: %SiOt+2 (2) For an r.tmcsphefe'cbhtam'ing not .new 1910.93a, which is published in this -more than 23 fibers per milliliter greater document, to construction work which is 15 50 5mg/M* .than 5 microns in length over an 8-hour subject to the Act. The amendment is average, or more than 50 fibers.per milli necissary in light of the rule of regula Note: Conversion factors-- ' \ liter" over any period of 15 minutes, a*tory construction set forth in 1910.5(c). mppcfX35.3*mi!Uon particles per cubi.ce meter ^reusable or single -use; filter time iespira-'r As amended, 1910.12 reads as follows; s particles per c.c. * Millions of particles per cubic foot: o', air,. based ou Imptngcr samples counted by light-field technics. * Tho 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 ' tor/ j operating with negative pressure during the inhalation phase of breathing, ,151 0.12 Construction work. approved by the U.S. Bureau of Mines to (1) Adoption and extension of s- under the provisions of 30 CFR Part 14 tabished safety and health standards (Bureau of Mines Schedule 21B), or a for construction. The standards /pta- shown to be applicable. \ * As determined by the membrane filter method at 430Xphase contrast magnification. \ valveless respirator providing equivalent scrilacl by Part 1518 of this title and in protection, shall be used^___ effect 0:1 April 28. 1971, are adopted as both concentration and percent quartz for the appli cation of this limit are to be determined from did fraction passing asjiiz;e-selcctor with the following characteristics: _ (3) For an atmosphere containing'not occtpntional safety or health standards more'than.250 fibers per millilter greater un&r section 6(a) of the Act,and shall jthan 5 microns in length over ah. 8-hour apis'/, according to the /provisions Aerodynamic diameter Percent passes average, "or more" than 500 fibers per theicof, to every employment and place milliliter over any period of 15 minutes, of employment of every employee en- (unit density sphere) selector ^ ,^a, powered -filter positive- pressure res- gagrd in construction work. Each em / / is /. 3.r / 5.0 / 10 ;-piratdifapproved by the U.S. Bureau of ployer shall protect the employment and 90 \ ' Mines under the provisions of 30 CFR places of employment a/bf each of his \ SO \ Part 14-(Bureau of Mines Schedule 21B) employees engaged in construction work 20S \\ -shall be used; ____ . by complying with-1' the appropriate (4) For, an . atmosphere containing standards prescribed by this paragraph. he measurements under this note refer to the use of i AEC instrument. If the respirable fraction of coal oust is determined with i M RE the figure conespoudin'5 /to that of 2.4 Mib'M* in the table for coal dust is l.J more--thanf"2o0l-'fibers per milliliter C> The standards prescribed in greater than 5 microns in_length over 5 1518.55(c) .of this title shall apply in an 8-hour average a type C positive pres- the case of the'' exposure of any em sure-supplled-air respirator approved by ployee in construct;ioonn. ww ork to airborne 2. A new 5 1910.93a is added to Part the U.S. Bureau of Mines under the pro asbestos dust/ 1910. The new 1910.93a -cads as visions of 30 CFR Part 12 'Bureau of * / Afollows: 1910.93a Asbestos dust. (a) The 8-hour time-weighted aver age airborne concentration of asbestos dust to which employees are exposed ihall" not"exceed 5 fibers per millilite?'-' greater than. 5 microns in. length, as de termined by the membrance filter Mines Schedule 19B).shalTbe lisedr (5) The employer shall establish a respirator program in accordance with the requirements of American National Standard Practice for Respiratory Pro tection Z8S.2--1969. ` (6) The respirators provided each em ployee shall be properly inspected, cleaned, repaired and stored. Effective/ date. Thcge amen Jments shad become effective iri'mediately upon publication in the Federal Register (12-7-71). \ (Sec G(cJ, 6-i Stat. 1S9G. 29 C.S.C. 635; Secrctc-y's drdcr No. 12-71.3G F.R.'STSP) S.gnecl at Washington, d'c., this dayoi December 1971. method at 400--150 x magnification (4 millimeter objective) phase contrast . illumination. Cuxccntfatiohs . above _.5 -fibers"per fhfi'.iUter but, r.oi-to exceed-10 fibers per milliliter, may be permitted* (d) (1) When an employer has em ployees who are exposed to asbestos dust exceeding the limits prescribed hi para graph (a) of this section and the ex posure" results from the operations de / G. C. GUENThER, Assistant Secretary of Labor. Ip BoV-71-17033 Filed 12-C-7I;8:47 ain^ 6113 23836