Document zoDXBwYb2mj7Qabj7wG4jEoYz

FROM GEORGE H. FARRAH ENVIRONMENTAL HEALTH LABORATORY ALCOA TECHNICAL CENTER INDUSTRIAL HYGIENISTS April 17, 1972 RE: INDUSTRIAL HYGIENE NEWSLETTER - ASBESTOS DUST EXPOSURES Mr. R. P. Carter's Newsletter dated December 23, 1971, concerning the 06HA emergency standard for asbestos has led to many requests for advice in determining compliance with the new Federal standards. This letter attempts to point out the more likely areas of exposure to asbestos dust, general reduction of worker exposures and includes sampling and analytical methods to determine if you are in compliance with any promulgated C6HA standard referring to asbestos. The principal asbestos-containing materials of concern (apart from building insulation and pipe covering) are Molten Metal Marinite (Johns-Manvilie), asbestos shorts and insulating block used in smelting cells and furnaces of all types. Marinite constitutes a problem from the point of delivery of sheet stock, through storage and handling, all machining operations, removal of used material, to disposal of wastes. Asbestos shorts, as currently used, may present dust problems during transfer and mixing of the dry material in preparation of mortar, and in removal of old linings. According to Mr. H.M. Short, practically all the insulating (back-up) block used in smelting cells and in all types of furnaces contains 8% asbestos. This means that the operations of removing old lining from furnaces and cells, and even the relining, can create asbestos dust exposures. Asbestos is also used in other forms, such as paper and rope, and in a variety of applications - but principally as high temperature gasket. Wherever asbestos is routinely used, and in whatever form, we must take a careful look at exposures, not only of those handling the material, but of other workers in the vicinity. As mentioned in the December 23 Newsletter, this concern applies as well to the demolition of asbestos-covered structures, pipes, etc. In starting an asbestos dust control program, the first step should be the listing of all forms and applications of asbestos-containing materials. This information should be readily available from the Process Materials List which all plants should have prepared and which they should maintain as current information. Next, all operations involving asbestos should be critically inspected. In many cases, it will not be necessary to collect samples and count fibers to recognize that concentrations are too high. If inspection of the operation shows a visible dust cloud, or if there is a layer of asbestos dust on surrounding surfaces, control measures must be instituted at once. Many of these measures are specified in the Federal Register of Tuesday, December 7, 1971; there are also some useful suggestions in the copies of Insulation Hygiene Progress Reports which were attached to the December 23, 1971, letter. Most shops in which Marinite is processed have exhaust ducts attached to lathes, table and bandsaws, routing machines, etc. Power hand tools are similarly equipped and connected to the exhaust system. Some of these do a fairly good job of capturing dust, others are of little value. To be effective, enclosure with ALCOA APC 004255 Industrial Hygienists April 17, 1972 Page 2 high capacity exhaust systems. Furthermore, exhaust systems must be connected to collection systems which meet the performance standards set forth in the Federal Register, December 7, 1971, page 23208, Section 1910.93a and pages 23242-23243, Sections 61.23 and 61.24. There should be no visible emissions from discharge of the collection system. This discharge should be to the outside and directed away from any windows that may be opened, to avoid any pos sibility of dust being blown back into the workroom. Where the collector discharge is directed against the side of a building and has resulted in a readily visible brown deposit, collection efficiency may well be questioned. Assistance with your control problems can be obtained from the Pittsburgh Environmental Engineering Division. The handling of dry asbestos shorts may be avoided by purchase of this material in plastic bags equipped with hose connections which permit wetting of the contents before the bag is opened. Wet-digging of old trough and furnace linings, where this is permissible, will reduce the generation of dust. If wet removal and replacement of lining is done in the open, provision should be made for adequate clean-up, includina flushing away of fines, so that dust will not blow about as the work area dries. In all cases, clean-up must be done by means of vacuum cleaners and not by dry sweeping. Asbestos wastes should be collected and disposed of in sealed bags as required by the existing standard. In removing old furnace and cell linings, wetting the exposed surfaces to minimize dust should be employed wherever practical. Again, the Pittsburgh Environmental Engineering Division should be consulted on the^practicality of exhaust from the working area, especially during lining removal. After installation of all appropriate control measures, even though there is no visible dust, an air sampling program will be necessary to determine whether respiratory protection may be discontinued. If levels of dust are above the standard permitted, the actual levels will establish the type of respiratory protection required. The emergency standard for asbestos dust published in the Federal Register of December 7,. 1971, established the approved method for counting the fibers in a sample. When this level was proposed as a permanent standard in the Federal Register of January 12, 1972, (Attachment #1) some of the details of sampling were also spelled out, along with requirements for warning signs, environmental sampling, and medical examinations. Early in February, NIOSH published a criteria document on asbestos dust recommending a still lower fiber count as the standard. The detailed method for sampling, counting and calculating the fiber concentrations which was contained in this document is given in Attachment #2. Attachment #3 is a copy of Q3HA Sampling Data Sheet #2 which contains additional helpful information. Regardless of the concentration which is established as the final standard, these sampling and analytical procedures will apply. APC 004256 Industrial Hygienists April 17, 1972 Page 3 Sampling to determine worker exposures will be the responsibility of each plant and suitable equipment must be purchased, if it is not already available. The decision to evaluate samples in-house or to send them to a commercial laboratory will depend upon availability of personnel and equipment, and the volume of work anticipated. While our Environmental Health Laboratory will be equipped to make these evaluations for the Technical Center, the anticipated demand would be too great if we were to offer our services, company-wide. Collection of samples is most conveniently done with pre-loaded filters and a small, battery powered pump of about 2 liters per minute capacity, such as the following: Pre-loaded Filters Millipore Field Monitors, Cat. No. MAWP 037 AO Price per carton of 50 (available from Millipore Corp., Bedford, Mass. 01730) Battery Powered Pump $30.00 1. MSA Portable Pump Assembly, Model G, Cat. No. 456058 (Requires MSA Battery Charger Assembly, Model G Pump, Cat. No. 456059) $160.00 $ 40.00 Mine Safety Appliances Co. .. 201 North Braddock Avenue Pittsburgh, Pa. 15208 or 2. NEI Micronair Personal Air Sampler, Cat. No. 3900-10, complete with Nicad battery and charger $195.00 National Environmental Instruments, Inc. 1865 /Post Road Warwick, R.I. 02888 Counting the fibers collected on the filters requires the use of a microscope equipped for phase contrast illumination, and a good quality microscope lamp, preferably one capable of providing Kbhler illumina tion. To adape a given microscope for this work, the manufacturer should be consulted because the optical parts of different manufacturer may not be interchangeable. A Bausch and Lomb CTA-10 conventional microscope would require these accessories: special condenser, telescope, filters, phase annulus, and objective totaling $344.00. A suitable microscope lamp may cost about $100.00. If a microscope is to be purchased especially for this work, consideration should be given to the American Optical N51MP Series 50 Phase Teaching Microscope with 4X scanning objective, 10X phase and 45X phase objectives, and built-in AFC 004257 Industrial Hygienists April 17, 1972 Page 4 illuminator. It appears to be a satisfactory instrument and sells for $448.00, without carrying case. Examination of Molten Metal Marinite dust by phase contrast and b'bright field illumination showed little difference since the fibers are stained brown - probably by iron oxide - due to heat treatment which Marinite receives to convert it to the Molten Metal type. This was confirmed by discussion with the Product Manager for Marinite, Johns-Manville Corporation, who stated that the only type of asbestos used in Molten Metal Marinite is the brownish amosite. At this time, it appears that exposures to Molten Metal Marinite fibers can be evaluated by bright field counting with a conventional microscope. Therefore, this can be used to get preliminary data on Marinite dust concentrations, until equipment for the standard method required by C6HA is obtained. This is not the case for other forms of asbestos, which will require phase contrast microscopy at the outset. Sending samples to commercial laboratories for counting may be advantageous in some cases, but may also present difficulties in locating laboratories qualified to perform this service. Walter C. McCrone Associates, Inc., Chicago, 111., is probably the best known organization in the field of consultative microscopy and is preparing to.offer this service at a charge of $25.00 to $30.00 per sample. Mr. Robert P. Carter has supplied a corrected list for the respirator approved by the Bureau of Mines to replace that attached to his December 23, 1971, letter re "Emergency Standard for Exposure to Asbestos Dust." A copy of this corrected list is Attachment #4. If after reviewing this letter and all attached materials you have questions or special problems concerning methods of sampling and counting, please contact me. GEORGE H. FARRAH GHF:mh Attachments cc, no att: Chairmen, Environmental Health Steering Committees V. W. Rieke, Pgh. - 2 L. V. Cralley/T. B. Bonney, Pgh. - 7 W. B. Garyotis, Pgh. - 2 R. H. Watson, Pgh. - 7 R. B. Kempton, Rea Magnet APC 004258 DISTRIBUTION: Arkansas Badln Chillicothe Cleveland Cressona Corona Davenport Lafayette Lancaster Lebanon Logans Ferry Marshall Massena Mobile Pt. Comfort Richmond Rockdale Tennessee Tifton Vancouver Vernon Warrick Wenatchee in~dustri. ;jvci[i s ts J.: . I.v.tdenberg Earl e ."organ J. bchachtele L. L. Gr ubb E.J. Schafer R.H. Allen K.W. Williams L.S. Chambers H.E. Hillstrom R. Andrew W.D. Helmick J.W. Warnock w.s. Barr Albert Steel*. C.F. Scott R. E. Beachem A.G. Clayton J.C. Veryho L.L. H. L. R.L. J.A. Haisch Chandler Parsons Thompson _____raise chairmen J.W. Wells R.C. Hinkle J.J. Thimons L.J. O'Connell N.O. Kraft R.H. Allen d.l. Schaffer J.B. Dolan R.S. Howell R. /Andrew J. Hicks L.E. Norris R. W. Knapp R.V. Newsome C.L. Green R.H. Cunneen G.W. Hutton H.W. Brooks H.E. Chandler P. F. Woodward J. R . Jones R.J. Knox J.A. Thompson APC 004250 Attachment #1 466 PROPOSED RULE MAKING regulated by this order than from other order plants during the month Proposed No. 9. Amend I 103# 42fb> (2) to read "Other source milk In bulk fluid form exclusive of that specified fen 9 1036.41(c) (6)-. Proposal No. 10. Amend 9 103S.43 /*- terplant movements. Add In 9 1036.43(C)(3) (1). Ul(. and (111), the words "of bottling grade milk* after the phrase "constitute regular sources of supply". Proposed by Borden. Inc.: Proposal No. 11. Add to 9 1036.45 a pro vision to read as follows: ' Subtract from the remaining pounds of skim milk In Class U. the pounds of skim milk In other source milk (except that received In the form of a fluid milk product) that is added to. or used to pro duce. any product specified In 9 1036.41 (b). Proposed by Town and Country Dairy, Garvins Dairy, Sweet Home Dairy, and Halms Modem Dairy: Proposal No. 12. Amend order No. 36 to provide that the following counties In the State of Ohio: Behnont, Jefferson. Harrison, Monroe, and part of Guernsey now In the marketing area: plus the West Virginia counties of Hancock, Brooke. Ohio, and Marshall be Included In Zone 1 as defined by the proposal of Milk. Inc. (Proposal No. 1): or alterna tively that the above dairies are to be put In the present Cleveland-Erle District rather than the Pittsburgh District. Proposed by the Dairy Division. Con sumer and Marketing Service: Proposal No. 13. Revise 9 1036.11(a) (1) to read as follows: 1036.11 Pqol plank. (a) A distributing plant that has: (1) Route disposition except filled milk, during the month of not less than 50 percent (40 percent for each month of April through August) of the total re ceipts of fluid milk products, except filled milk, that are approved by a duly constituted health authority for fluid consumption and that are physically re ceived at such plant or diverted as pro ducer milk pursuant to 11036.16 to a supply plant qualified under paragraph (b> or (c) of this section or a nonpool plant; and Proposal No. 14. Review the provisions of 9 1036.11(e) to determine whether they should apply only to plants primar ily engaged In the transfer of milk to distributing plants qualified under para graph (a) of this section. Proposal No. IS. Revise 9 1036.30(a) (3) to read as follows: 1036.30 Report of receipt* and ul3ueotioik (a) * (2) Inventories at the beginning and end of the month of the Ioilerwing products: (I) Fluid milk products; and (II) Products listed In 9 1036.41(b) (1). except these received In packaged form from another plant, showing separately such Inventories In bulk form and In packaged form: Proposal No. IS. Revise 9 1036.41(c) (6) (vll) to read as follows: 1036.41 Qsmcs of utilization. (c) * * (6) * * (vll) Less 1.5 percent of the quantity of bulk fluid milk products and bulk cream transferred to other plants which does not exceed such quantity to which per centages are applied In subdivisions (1), (11), (It), (v) and (vl) of this subpara graph; Proposal No. 17. Make whatever changes are necessary in the order to eliminate the possibility of a handler be ing charged under the order at the Class I price for milk that already has been classified and priced as Class I milk un der a Federal order. Proposal No. IS. Reposition, for clari fication of the order, the provisions which establish that the Class I price for ether source milk when adjusted for location of the shipping plant, shall not be less than the Class III price. Proposal No. 19. Make whatever changes are necessary In the order to provide for a uniform "equivalent price" section to read as follows; 1036.54 Equivalent price. If for any reason a price or pricing component required for this part for computing class prices or for other pur poses Is not available In the manner de scribed in this part, the market admin istrator shall use a price or pricing com ponent determined by the Secretary to be equivalent to the price or pricing com ponent that Is required. Proposal No. 20. Make such changes as may be necessary to make the entire marketing agreement and the order con form with any amendments thereto that may result from this hearing. Copies of this notice of hearing and the order may be procured from the Market Administrator. 7503 Brookpark Road. Cleveland. OH 44129 or from the Hear ing Clerk. Room 112-A. Administration Building. UJS. Department of Agricul ture, Washington. D.C. 20250 or may be there Inspected. Signed at Washington. D.C, on Janu ary 7. 1972. John C. Blum, Deputy Administrator, Regulators Programs. [PB Doo. 73-49* nied 1-11-73:8:49 am) DEPARTMENT OF LABOR Occupational Safety and Health Administration t 29 CFR Port 1910] STANDARD FOR EXPOSURE TO ASBESTOS OUST Notice of Proposed Rule Making Section 6(c) of the Wtlllams-steiger Occupational Safety and Health Act of 1970 (84 Stat. 1596; 29 UB.C 655) providea that upon the publication of on emergency temporary standard In the Federal Register the Secretary of Labor shall commence a rule making proceed ing In accordance with section 6(b) of the Act. and that the emergency standard as published shall also serve as a proposed rule for the proceeding. An emergency temporary standard concern ing exposure to asbestos dust was pub lished In the Federal Register on De cember 7. 1971 <36 PR. 23207). Accord ingly, pursuant to section 6 (b) and (c) of the WOllams-Stelger Occupational Safety and Health Act of 1970 (84 Stat. 1593, 1596; 29 UJB.C. 655). 29 CFR 1910.4, and Secretary of Labor's Order No. 12-71 (36 FJL 8754). It Is hereby proposed to amend 29 CFR Part 1910 as set forth below. The proposals Include the emergency temporary standard and additional proposed rules on subsidiary Issues. Interested persons are Invited to sub mit, both orally and In writing, data, views, and arguments concerning these proposals. Written data, views, and arguments may be mailed to the Office of Safety and Health Standards. Room 305. 400 First Street NW,, Washington. DC 20210, with in 30 days after the publication of this notice in the Federal Register. The data, views, and arguments will be available for public Inspection and copying at the Office of Safety and Health Standards, except as to matters the disclosure of which Is prohibited by law. Oral data, views, and arguments will be received by Hearing Examiner Arthur Goldberg, at a hearing beginning at 10 a.m. on March 14. 1972. in Conference Room B. Departmental Auditorium. 14th Street and Constitution Avenue NW.. Washington. DC. Persons desiring to ap pear at the hearing must file with the Office of Safety and Health Standards a notice of Intention to appear, no later than March 3. 1972. The notice must state the name and address of the per son to appear the capacity In which he will appear, and the approximate amount of time required for his presentation. The notice must also Include, or be ac companied by. a statement of the posi tion to be taken with regard to the pro!>osed rules. The oral proceedings shall be reported verbatim, and transcripts shall be avail able for Inspection to any interested per son on such conditions us the presiding FE0UA1 UOISTM. VOL 17, NO. 7--WfDNISOAT, JANUARY 11, 1971 APC 004260 PROPOSED RULE MAKING 467 hearing examiner may prescribe. The hearing examiner shall regulate the course of the oral proceedings, dispose of procedural requests, objections, and similar matters, regulate the conduct of those present at the hearing by appro priate means, and shall exclude to the extent practicable Irrelevant. Immaterial, and unduly repetitious data or argu ments. Hie hearing examiner shall have discretion to keep the record of the hear ing open for a reasonable, stated time to receive written recommendations, and additional data, views, and arguments from any person who has participated in the oral proceeding. Upon completion of the oral proceedings, the transcript thereof, together with written submis sions on the proposed rules, exhibits filed during the hearing, and any posthearing data, views, arguments, and' recommen dations shall be certified by the hearing examiner to the Assistant Secretary of Labor for Occupational Safety and Health for his decision The Assistant Secretary may adopt the proposals with or without changes, or determine not to Issue a rule. Under the authority of section 8(b) (1) and section 7(b) of the Act, the Assist ant Secretary of Labor for Occupational Safety and Health will request the recommendations of an advisory com mittee with regard to the proposed rules. The committee will be provided with copies of these proposals, together with all pertinent factual Information which Is. or may become, available to the As sistant Secretar' including any infor mation submitter by the National Insti tute for Occupational Safety and Health. The advisory committee will be asked to" submit to the Assistant Secre tary written recommendations regarding these proposed rules within 45 days after the publication of this notice. The recommendations win be available for public Inspection and copying. No other advisory committee will be consulted with retard to these proposed rules. Part 1910 of Title 29 of the Code of Federal Regulations Is proposed to be amended as follows: S 1910.93 [Amended] 1. Table Q-3 in 11910.93 <38 F.R. 15104, August 13,1971) Is proposed to be amended by deleting the following: Asbestos--It &bers psr milliliter greater then 6 microns In length or " t Mppcf. TtmuoUU S8 Manor Mppef. 40%310- If so amended, Table 0-3 would read as follows: Table 0-9--Minebal Dvbtb Substanca Mppcf M|/M> SIHck CrynUlUn* Quortt (ncplrtble)............... 280r lOmg/M* %810+ %SIOt+2 Quarts (total ftu.H)................................... 30toc/M> CrUUbBlH Um H tha ralus calculate! from tha emmt or rums formulas for tiuaru. Trldymlta: Uts H tbs tbIos euleulatsd from ths for* inulas for quarta.- 7*810,+2 Subata*c* paragraph arc not feasible or do not re Mppcf Mf/M duce the concentration of asbestos dust below the limits prescribed in paragraph Amorphous, tnelurllnc natural dlaluroscooti* <urUi............ 20 Mae/M* (a) of this section, the employer shall require the use of respiratory protective %SlO, devices. The selection of respiratory pro Bllicslia (I**** than 1% cry* UUins atilca): Mica........................................ Soaiulon*...................... Talc. Portland asinmt........ OraphUs (natural)___ Coat dust (msplrabl* fraction lam than 9% 810,1 For more than 8% 810,. tective devices shall be limited to those specified In paragraph (e) of this section. <il> The employer shall require that each employee test his respiratory pro IS tective device before each use in order to insure a proper fit according to the IMmf/M1 manufacturer's instructions. The em or I0ME/W ployer shall further provide for effective training or supervision of employees in ln*rt or Nuiascr Dust: Rmplrahl* fraction... Total dust.... ___ %8iO,+2 Che testing of respiratory protective de IS 41 IS6tmoef//MM>* vices for fit before their use. (c> Allowable respirators. (I > When the 8-hour time-weighted average con Note: Contmtofl factor*- centration of asbestos dust is projected m|>pcfX3&J< million particks psr euhk fwier partkM* psr e.e. I Millions of particles per cubk foot of air, Imus*! on to exceed 5 fibers longer than 5 microns per milliliter, but not to exceed 25 such ImpInEsr ampin counted by UfbMield techntac Tha perrmtaES of crystalline sUka In tha formula Is the aierpt InamUokumnst nelermlnad from iiuuuiera In which alHiornt wmplm, other methods here- berm shown to ha *|pltmble. i As determined by tha membrane fUtrr method at 430 X phase contrast magnUtaalton. fibers, and when a concentration over a period of IS minutes exceeds 10 fiber* longer than 5 microns per milliliter, but does not exceed 50 such fibers, a re usable or single use filter type respira Doth concentration and pronsut quarts for tha eppitettUon of this Umlt art to be determined from the fraction paving a alls selector with the following tor. operating with negative pressure during the Inhalation phase of breath characteristics: ing, approyed by the 03. Bureau of Mines under the provisions of 30 CFR Aerodynamic diameter Percent paving Part 14 (Bureau of Mines Schedule 21B), (unit density sphere) selector shall be used. (2> When the 8-hour time-weighted 2 average concentration of asbestos dust 2.8 as 78 80 is projected to exceed 25 fibers longer AO 10 23 0 than 5 microns per milliliter but not to exceed 250 such fibers, and when a con centration over a period of 15 minutes The mrasummenta under this note refer to ths um of so AEC Instrument. If ths respirable fraction of ooal dust Is determined with a MRS tha Agora corresponding exceeds 50 fibers longer than 5 microns per milliliter but does not exceed 500 to that of 2.4 Mg/M* in the table for coal dust Is 4A Mg/Ms such fibers, a powered filter positive 2. A new i 1910.93a la proposed to be added to Part 1910, reading as follows: pressure respirator approved by the US. Bureau of Mines under the provisions of 30 CFR Part 14 (Bureau of Mines Sched S 1910.93a Asbestos dual. ule 2lB> shall be used. (a) S-hour time-weighted average. The 8-hour time-weighted average air borne concentration of asbestos dust to which employee* are exposed shall not exceed 5 fibers longer than 5 microns per milliliter, a* determined by the mem brane filter method at 400-450 x (mag nification) (4 millimeter objective) phase contrast Illumination. Concentra tions above 5 fiber* per milliliter, but not to exceed 10 fibers per milliliter, may be permitted up to a total of 15 minutes in an hour, but for not more than 5 hours In an 8-hour day. (b) Methods of compliance--(1) Engineering methods. Engineering methods, such as. but not limited to. en closure. vacuum sweeping, and local ex haust ventilation, shall be used to meet (3) When the 8-hour time-weighted average concentration of asbestos dust is projected to exceed 250 fibers longer than 5 microns per milliliter a type "C" positive pressure supplied-alr respirator approved by the U.S. Bureau of Mines under the provisions of 30 CFR Part 12 (Bureau of Mines Schedule 19B) shall be used. (4) The employer shall establish a respirator program In accordance with the requirements of American National Standard Practice for Respiratory Pro tection Z88.2--1969. (5> The respirators provided each em ployee shall be properly inspected, cleaned, repaired, and stored. (d) Particular operations and prod ucts. ill When an employer has employ the exposure limits prescribed In para graph (a) of this section. Where such engineering methods are not feasible, or do not reduce the concentrations below ees who are exposed to asbestos dust re sulting from the operations or the use of tools described in the remaining sub paragraphs of tills paragraph (d>. the the limits prescribed In paragraph (a) of this section, respiratory protective de vices shall be provided and used In ac cordance with subparagraph (3) of this paragraph. (2) Other methods. (1) When the limits of exposure to asbestos dust pre scribed In paragraph (a) of this section are exceeded, and engineering controls required by subparagraph (1) of this employer shall comply with the require ments of this paragraph. The require ments of this paragraph shall apply at all times, and. in addition, the require ments of paragraph (b) of this section may also apply, according to the terms thereof. (2) Ail hand- or power-operated tools which produce asbestos dust such as. but not limited to. saws, scorers, abrasive FEDERAL REGISTER, VOl. 37. NO. 7--WEDNESDAY. JANUARY 17, 1*77 APC 004261 468 PROPOSED RULE MAKING wheels, and drills, shall be provided with dust in excess of the limits specified In In every employment and place of em local exhaust ventilation ana dust col paragraph <c)i3) of this section shall ployment covered by S 1910.12, 1910.13, lectors In accordance with the American be monitored In accordance with this 1910.14. 1910.15. or 1910 16 of this Sub National Standard Fundamentals Gov paragraph. part B. in lieu of any different standard erning the Design and Operation of Lo (1) Method. Oust samples shall be col on exposure to asbestos dust which cal Exhaust Systems; ANSI Z9 2--1971. lected from within the normal breathing would otherwise be applicable by virtue (31 Employees exposed to the spray zone of the employees In their normal of any of those .sections ing of asbestos, to the demolition of pipes, structures, or equipment covered working posture Employees wearing res piratory protective devices sliall have (Sec. s. 84 9U1. 1693. 39 U S C 866. 39 CFR 1910.4: Secretary of Labor's Order No. 13-71. or Insulated with asbestos, or to the the sample taken from a point located on 38 r_R 8754) demolition of Insulating strippings, shall be provided with respiratory protective devices In accordance with paragraph (c> (3) of this section. the exterior of the respirator facepiece. (iii Procedure The sampling proce dure shall be such as to permit the de terminations required hy paragraph <a> Signed at Washington DC., this 6th day of January 1972. O C GUZMTHIk, (41 Asbestos cement, mortar, coatings, of this section Aa'-i-tant Secretary o/ Labor. grout, and plaster shall be mixed in closed bags or other closed containers. <51 Asbestos waste and scrap shall be collected and disposed of in sealed bags or other closed containers (iii Sampling duration The sampling duration shall be for a period of not less than 15 consecutive minutes iv San>phno irequenev Sampling periods shal! be oi -uch number and :PRD>w 73 402 Piled 1 II 73:6:43 ami DEPARTMENT OF HEALTH, (8) Accumulation of asbestos dust pattern as to represent accurately the shall be removed, as soon as practicable, exposure of the employees over their and only by vacuum cleaners. working period EDUCATION, AND WELFARE (e> Warning signs--il> Posting. * 2 Environmental. En'ironmental Food and Drug Administration Warning signs shall be provided and monitoring shall be conducted in all displayed at each location where asbestos areas in which employees are exposed to ( 21 CFR Part 19 1 dust hazards are present. Signs shall be concentrations of asbestos dust in excess posted at least 50 feet In each direction of the limits specified in paragraph (a) CERTAIN CHEESES from the location where the hazard is of this sect!or. Proposed Identity Standards present, and at intervals of not more (1) Method. Asbestos dust samples Regarding Labeling Requirements than 100 feet along each edge of the area where the hazard Is present. (3) Sign specifications. The warning signs shall conform to the requirements for 20" x 14" vertical format signs speci fied in J 1910.145(d) (2). and to this par agraph. The signs shall display the fol lowing legend in the white panel, with letter sizes and styles of a visibility at least equal to that specified in the nota tion in the following column to the right: Legend: Asbestos................ Dust Hazard____ Follow these..................... Safety and Health Notation 1" Sana Serif Oothlc or Block. V" Sana Serif Oothlc or Block. It Oothlc % Sana Serif shall be collected from areas which are representative of the concentration of airborne asbestos dust which may reach the breathing zone of exposed employees. (iii Procedure Sampling procedure shall be such as to permit the determina tions required by paragraph <a> of this section. <UI> Sampling durai. - .Sampling du ration shall be for a period of not less than 15 consecutive minutes. < iv i Sampling Irequencv. Sampling periods shall be of such number and pattern as to represent accurately the exposure of the employees over their working period. (gi Medical examinations. The em ployer shall provide, or make available at his cost, appropriate medical exami nations on a periodic basis to any em Notice is given that a petition has been filed by the National Cheese Institute. Inc.. 110 North Franklin Street, Chicago. 111. 60606. proposing that Identity stand ards for certain specified cheeses be amended to require that ill the full name of the food appear on the principal display panel of the label in type of uni form size, style and color 2> wherever any word or statement emphasizing the name of any ingredient appears on the label (other than in circumstances de scribed below so conspi'-uously as to t r easily seen under customary conditions of purchase, the full name of the food lmmediateh and conspicuously precedes or follows such word or statement in type of at least the same size as the type of such word or statement, and <3) op tional ingredients be listed conspicuously, Rules. Oothlc or ployee who Is exposed to asbestos dust either on the principal display panel of 1. Avoid breathing dust. 3. Wear your respirator. 3. Do not remain In area unless your work Block 14" Oothic (4 "Oothlc V4 '' Oothlc. In excess of the limits specified in para, graph (a) of this section. fh) Records. 1 > Every employer shall maintain records of the personal and environmental monitoring, and of the medical examinations, required by para the label or on a single appropriate In formation panei In accordance with specifications that are consistent with similar specifications foi many other food products Accordingly .t <s proposed that Pari requires It. graphs (f) and <g> of this section. Such 19 be amendeo Asbestos dust may cause asbestosls. a severe lung disease, and Is Implicated In the development of certain cancers. Con trol of exposure to asbestos dust helps protect against Sheas 14 point Oothlc. records shall be maintained for at least 20 years. (2) The records of monitoring shall be made available for inspection and copying to the Secretary of Labor and to his designated representatives. (3) The records of medical examina tions shall be made available only to the 1 In j 19 7S0'f> by revising subpara graph <6> and adding subparagraphs and <8>. as follows 19.7.10 Fwlrurixed proven* vheenet iili-nlily; label -lalemctil of optional inkrcdienlv. 64 8 *9 Secretary of Labor, to the Secretary of i f i * (3) Spacing. Spacing between llnee shall be at least equal to the height of the upper of any two lines, except that the spacing between "Following these" and "Safety and Health Rules" shall be at least (f) Monitoring--(1) Personal. Em ployees engaged In the particular opera tions or using the particular tools speci fied In paragraph (d> of this section, or exposed to concentrations of asbestos Health, Education and Welfare, to desig nated representatives of either of them, and. at the request of the employee or former employee examined, to his physician. 3. A new | 1910.19 is proposed to be added to Subpart B, reading ns follows: g 1910.19 AvIitmov <lui. Section 1910.93a shall apply to the ex posure of every employee to asbestos dust >6) The fuli name of the food shall appear on the principal display panel of the label in type of uniform size, style, and color (7) Wherever any word or statement emphasizing the name of any ingredient appears on the label (other than as speci fied in subparagraph 8* of this para graph! so conspicuously as to be easily seen under customary conditions of pur chase. the full name of the food sliall FEDERAL REGISTER, VOl. 33. NO. 7--WEONESOAY, JANUARY 13, 1973 APC 004262 MEASUREMENT OF ASBESTOS FIBERS Attachment #2 The sample should be collected on a 37-rjlll iinetcr Mllllpore type AA'V filter mounted In an open-face filter holder.. The holder should be fastened to the worker's lapel and air drawn through the filter by means of a battery-powered personal sampler pump similar to those approved by NIOSll under the provisions of 30 CFR 74. The filters are contained in plastic filter holders and are supported on pads which .also aid in controlling the distribution of air through the filter. To yield a more uniform sample deposit, the filter-holder face-caps t/i r\<' should be removed. Sampling flow rates from 1.0 liter per minute (1pm) up to the maximum flow rate of the personal sampler, pump (usually not over 2.5 1pm) and sampling time from 15 minutes to eight hours are acceptable provided the following restraints are considered: (a) In order to obtain an accurate estimate cf the number of fibers the statistical error resulting from the random distribution of the fibers must be kept to an acceptably low level. Since fiber counts follow a Poisson distribu tion, a count of 100 fibers in a sample would have a standard deviation of IUU or 10 fibers or 4- 10%. Thus the 95% confidence limits would be approximately 2 standard deviations or + 20%. Since the 37 mm filter has an effective collecting area of 855 m2 and the projected field 2 area of the Porton reticle is 0.005 mm , each field rep resents 1/L71000 of the sample. Based on this ratio the following number of fields must be counted to measure the various limits in various sampling times: Mention of commercial products does not constitute endorsement by the Public Health Service or U. S. Department of Health, Education and Welfare. VIII-4 ARC 004263 Sampling Time Minutes 10 15 30 90 90 240 240 480 Flo;; Rate 1pm 2 2 2 1 2 1 2 1 Number of Fields for 100 Fibers 0.2 fibcrs/ml 2.0 fibers/ml 10 fibe 4350 2860 1430 1000 500 260 180 180 435 286 143 100 50 26 18 18 91 58 29 20 10 7 4 4 0>) Do not count a field containing over 20 fibers because in addition to the fibers being counted, there are also present a number of grains, which interfere with the accuracy of the count. Based on these restraints, i.e., number of fields to be counted and maximum number of fibers per field, acceptable sampling parameters for the various limits are underlined In the above table. The following conclusions may be drawn from this analysis: (1) The short-term limit should be for a period of at least 15 minutes and preferably 30 minutes. (2) The 2.0 fiber/cc limit may be evaluated over , periods of from 90 to 480 minutes. As many fields as required to yield at least 100 fibers should be counted. In general the minimum number of fields should be 20 and the maximum 100. Mounting Sample The mounting medium used in this method is prepared by dissolving 0.05 g of membrane filter per ml of 1:1 solution of dimethyl phthalate VIII-5 APC 004264 i and diethyl oxalate. The index of refraction of the medium thus prepared is ND = 1.47. To prepare a sample for microscopic examination, a drop of the mounting medium is placed on a freshly cleaned, standard (25 mm X 75 mm), microscopic slide. A wedge-shaped piece with arc length of about 1 cm is excised from the filter with a scalpel and forceps and placed dust-sidc-up on the drop of mounting solution. A No. 1-1/2 coverslip, carefully cleaned with lens tissue, is placed over the filter wedge. Slight pressure on the coverslip achieves contact between it and the mounting medium. The sample may be examined as soon as the mount is transparent. The optical homogeneity of the resulting mount is nearly perfect, with only a slight background granularity under phase contrast, which disappears within one day. The sample should be counted within two days after mounting. Evaluation The filter samples mounted in the manner previously described are evaluated in terms of the concentration of asbestos fibers greater than 5 um in length. A microscope equipped with phase-contrast optics and a 4-rna "high-dry" achromatic objective is suitable for this deter mination. 10X eyepieces, one of which contains a Forton or other suitable reticle at the level"of the field-limiting diaphragm, should be used. The left half of the Porton reticle field serves to define the counting area of the field. Twenty fields located at random on the sample are counted and total asbestos fibers longer than 5 um are ncorded. Any particle having an aspect ratio of three or greater is considered a fiber. VIII-6- APC 004265 The following fcrnulaa are used to determine the number of fibcrc/ml: (1) Filter area (rn.ni2) Field area (mm'1) -K (2) Average net count X K = fibers/ml Air volume sampled (ml) For example, assume the following: area of the filter used was 855 mm2 i counting area of one field under the Porton reticle was 0.005 cary average net count per field of 20 fields was 10 fibers; and sample was collected at 2 liters per minute for 90 minutes: Then: B55ira2 = 171,000 (K) 0.005 tnm2 . . 10 fibers x 171,000 - 9.5 fibers/ml 2,000 ml/min x 90 min Calibration of Personal Sampler The accuracy of an analysis can be no greater than the accuracy of the volume of air which is measured. Therefore, the accurate calibration of a sampling device is essential to the correct interpretation of an instru ment "a Indication. The frequency of calibration is somewhat dependent on .a the use, care, and handling to which the pump is subjected. Pumps should be calibrated if they have been subjected to misuse or if they have just been repaired or received from a manufacturer. If hard usage is given the instrument, more frequent calibration may be necessary. Ordinarily, pumps should be calibrated in cne laboratory both before they arer used in the field and after they have been used to collect a large number of field samples. The accuracy of calibration is dependent on the type of instrument used as a reference. The choice of calibra tion instrument will depend largely upon where the calibration is to be performed. For laboratory testing, a 1-liter burette or wet"test meter should ba used. In the field, a rotameter is the most convenient VIII-7 APC 004268 Instrument used. The actual set-up will be the same for all of those Instruments. The calibration Instrument will be connected In sequence to the filter unit which will be followed by the personal sampler punp. In this way, the calibration instrument will be at atmospheric pressure. Connections between units can be made using the same type of tubing used in the personal sampling unit. Each pump must be calibrated separately for each type of filter used,' if, for example, it has been decided to use a filter with a different pore size. The burette should be set up so that the flow is toward the narrow end of the unit. Care must be exercised in the assembly procedure to insure adequate seals at the joints and that the length of connecting tubing be kept at a minimum. Calibration should be done under the same conditions of pressure, temperature and density as will be encountered. The rotameter should be used only in the field as a check if the diaphragm or piston pumps are not equipped with pulsation dampeners. The pulsating flow resulting from these type pumps causes the rotameter to give results which are not as accurate as that obtained with a burette or wet-test meter. Calibration can be accomplished with any of the other standard calibrating instruments, such as spirometer, Marriott's bottle, or drygas meter. The burette and wet-test meter wer* selected because of their accuracy,, availability, and ease of operation. Method based on a modification of the membrane filter method described by Edwards & Lynch "The Measurement of exposure to Airborne Mineral Fibers," Presented at the American Ind. Hyg. Conference, Denver 1969, VII1-8 APC 004287 Attachment #3 1 8330 OSHA SAMPLING DATA SHEETS FOR FIVE TOXIC SUBSTANCES RELEASED Back reference*: J 1071; 6647.93; 6647.93a. The sampling data sheets are repro The Occupational Safety and Health duced below. Administration has released sampling '' data sheets for the five toxic sub stances on which its "Target Health Hazards" program will focus. The R-iiour time-weighted average*: S fibers data sheets cover sampling equip per milliliter greater than 5 microns in ment and procedures for carbon mon oxide, asbestos, crystalline silica, lead and its inorganic compounds (except lead arsenate), and raw cotton dust. Criteria for violations of employee exposure to excessive concentrations of each substance are also described. length. Excursion limit*: 10 fibers per milliliter, up to IS minutes in an hour for up to 5 hours per 8-hour day. Unprotected or improperly protected worker exposures Analytical Method: Fibers counted at 400-450 magnification, using phase contrast illumination, with sample mounted in high-viscosity solution of membrane filter material. Sampling Equipment: Personal sampling pump plus Millipore type AA filter (37mm, 0.8 . pore size). Face cap is removed and filter used open face during sampling. Sampling rate: 2 I/m. Sample Size: Minimum period of IS minutes for evalua tion of excursion limit. Several samples of up to 4 hours for evaluation of 8-hour average. Samples with a visible deposit may be too heavy to count. Compare with a clean filter. Heavy concentrations of visible dust in the air (100 to S00 fibers/ml) may require short sampling periods of only 5 minutes, or less. Blanks: With each batch of samples submit two fil ters which are subjected to exactly the same handling as for the samples except that no air is drawn through them. Label these as blanks. Shipping: The cassettes in which the samples are col lected should be shipped in a suitable con tainer, designed to prevent damage in transit. Imminent Danger Situations: Generally not applicable. OSHA SAMPLING DATA SHEET #2 Substance: Asbestos. Standard: 29 CFR 19l0.93a(a) of December 7, 1971 I 8330 Serious Violation: 5.1 or more fibers per ml, greater than S . in length, for an unprotected or improperly protected worker, for an 8-hour timeweighted average, except for certain proven excursions as noted in the emergency stand ard. which may raise the 8-hour timeweighted average to S.8 fibers per ml. Nonserious Violation: Not applicable. De Minimis Violation: Not applicable. APC 004268 1972, Commerce Clearing House. Inc. CORRECTED LIST Attachment tt4 RESPIRATORS APPROVED BY THE U.S. BUREAU OF MINES UNDER SCHEDULE 2IB________________________ AO Safeline MSA R8100 with R100 filter R8156 with R156 filter R5056 and R6056 with R56 filters 5550 with 5950 filter 5556 with 5956 filter 5241 with 5971 filter 96000 with 96042 filter (This identical filter available as Cat. No. 96077 package of 5 filters and Cat. No. 96106 package of 50 filters) 10-86431 with Type S filter RESPIRATORS APPROVED BY THE U.S. BUREAU OF MINES UNDER SCHEDULE 19B________________________ Willson GA2H, GAHS, GAHW, TAHW, GA2, GA8, GAF and GAFW Acme 4615-1, 4616-1, 4654, 4800, 4810 and 4860 MSA "Lead-Foe (helmet)," and "Hyperflo" Pulmosan HA-99 and AL-180 AO R6099 Scott 6380DP Firewel U.S. Divers SurvivAir 9011-02 APC 004269