Document OE0VKk2RKxG47OXrLQ2x0E4kQ

FROM ROBERT P. CARTER PITTSBURGH OFFICE TO Jir. ThomasBonney Pittsburgh Office 7y^ / 3/ /. 'J * December 23, 1971 RE: EMERGENCY STANDARD FOR EXPOSURE TO ASBESTOS DUST In the Federal Register of Tuesday, December 7, 1971, the Occupational Safety and Health Administration, Department of Labor, published a notice of the issuance, effective immediately, of an emergency standard for exposure to asbestos dust. A copy is enclosed for those who have not yet seen it. This emergency standard, which will be effective until further notice, establishes lower permissible employee exposure levels than those which had been made effective with the notification in the Federal Register of Friday, August 13, 1971. We are, therefore, notifying all of our operating locations of this emergency standard so that they may take appropriate cognizance of this with respect to any of their operations involving the handling, cutting, fabricating or other work involving the use of asbestos or asbestos-containing products such as the Marinite which is used extensively in our ingot casting operations. Where there is any question about the present levels of worker exposure meeting these emergency standards, the use of appropriate respirators should be instituted. Shown on the attachment are all the respirators which have been approved as of February 1, 1971, by the U.S. Bureau of Mines under their Schedule 213 which is the required type protection as .efined in Part 1910,93a, paragraph (c) (2) and (3). A list of approved equipment under Bureau of Mines Schedule 19B as specified in paragraph (h) is also attached. Your attention is also called to paragraph (c) subparagraphs (5) and (6) which require the establishment of a respirator maintenance program and the proper inspection, cleaning, repairing and storing of respirators. It should also be noted that under paragraph (d) cutting or machining operations such as those which are used at many works for the cutting of Marinite or other asbestos products must be provided with local exhaust ventilation and dust collectors in accordance with American National Standard Fundamentals Governing the Design and Operation of Local Exhaust Systems, ANSI Z9-2 - 1971, and also that employees whose exposure results from the spraying of asbestos or the demolition of pipes, structures or equipment covered or insulated with asbestos shall be provided with respirators of the type C positive pressure supplied-air category approved'under Bureau of Mines Schedule 19B. Paragraphs (e), (f) and (g) deal with the mixing of asbestos mortar, grout and plaster, the disposal of asbestos waste, and the cleanup of asbestos dust. For your further information, we are attaching a copy of Volume 3, No. U, Winter, 1971, of' the leaflet "Insulations Hygiene Progress Reports" which contain some very helpful recommendations for minimizing and preventing asbestos dust from becoming airborne in various types of industrial operations. Additional copies of this leaflet may be obtained by contacting directly the source of this publication. _______________ 0 ALCOA Industrial Hygienists December 23, 1971 Page 2 If you have any questions concerning this important matter, please do not hesitate to contact us. ROBERT P. CARTER RPC:lei TO: INDUSTRIAL HYGIENISTS cc: T. M. Brown, Pittsburgh - 2 E. C. Collins, Pittsburgh - 21 J. W. DeWalt, Pittsburgh - 2 W. B. Garyotis, Pittsburgh - 2 H. J. Goodyear, Pittsburgh - 7 O.P. R. D. Pulver, Pittsburgh - 21 V. W. Rieke, Pittsburgh - 2 H. F. Robey, Jr., Pittsburgh - 21 H. C. Sperry, Pittsburgh - 21 G. H. Farrah, EHL, ATC cc (letter only): Safety Directors (d) APC 004248 Environmental Science* LaborIW7 of The C*y Un*f*y OfNMYM INSULATION HYGIENE PROGRESS REPORTS FROM THE INSULATION INDUSTRY HYGIENE RESEARCH PROGRAM Irvine J- Mlkoff, M.D., Proiram Wrvetof Vot 3. No. 4 Winter 2971 Duct produced by w* of an unventi lated band taw. without the back light ing used here, much of the dust would not be visible. Cutting pipe with band saw equipped with high-velocity, low-volume exhaust system. Compare absence of any air borne dust with that shown in uncon trolled cutting (picture left) --Shipyard Procedures Guide-- Helps All Insulation Men The Winter 1970 issue of Insulation Hygiene Progress Re ports announced a joint effort by the Insulation Industry Hygiene Research Program, the U.S. Navy, the Department of Labor, and insulation manuifacturers and contractors to control shipyard asbestos dust exposures. As part of that effort, Duncan A. Holaday and William B. Reitzs of the IIHRP prepared a procedures guide for shipyard insulation application and removal. Because of its relevance to all insulation work, portions of it are given in this issue of Insulation Hygiene Progress Reports. A complete report was presented by the authors at the Inter national Symposium on Safety and Health in Shipbuilding and Ship Repairing, at Helsinki, Finland, on August 30, 1971. by Duncan A. Holaday and William B. Reitzs The general goal in all insulation work should be to maintain a clean environment Measurements of concentrations of asbestos fibers ("dust counts") in the atmosphere can be used to identify sources of contamination and to point out deficiencies in control methods. Primary reliance for control of ex posures, however, must be placed on faithful observance of operating rules. Control of Asbestos-Containing Dusts by Use of Substitute Materials Substitution of materials contain ing reduced proportions of asbestos or no asbestos at all, is becoming more common in ship construction. Before a material is substituted for asbestos, however, two auestions must be carefully considered: a. Has the substitute material been tested? If not, it may turn out to be of the same or greater hazard than the material of known haz ard. This sort of thing has hap- Here Are Some of Many Ways to Reduce Dust pened in other environmental situations. b. Does the new material meet engi neering specifications and will it perform adequately under condi tions of use? Materials containing reduced amounts of asbestos have been used in the fol lowing applications: a. Blanket and pad filling Substitution of the proper types of other pad fillers not only re duces asbestos dust during fabri cation and installation but also tends to lessen the problems dur ing subsequent "rip-out". Addi tionally, asbestos cloth which has been treated with a dust suppres sant is available and its use should also be encouraged. There are re ports that much less dust will be produced. b. Pipe covering and block Serious consideration should be given to those products contain ing lower amounts of asbestos fiber. Several British firms have introduced asbestos-free calcium silicate block and pipe covering. To date, however, this material has not been adequately evaluated in the United States to determine how it will perform in use. Reduction of Dust by Changes in Work Methods a. Mixing Asbestos Mortar This operation has usually been done at the job site. While the time spent in' mixing is quite short, considerable dust is pro duced. A tested method of control is to mix the mortar dockside under controlled conditions and package the mixed mortar in sev eral containers for transportation to the job site. Mortar is also available packaged (Continued on second page) APC 004249 Insulation Hygiene Progress Reports Vat. ]. Na. 4 wintar >971 Procedures Used at Puget Sound Naval Shipyard from the Insulation Industry Hygiene Re search Program Editor! V. J. Nicholson, Ph-D., Published at the Environmental Sciences Laboratory (Irving J. Selikoff, M.D., Director), Mount Sinai School of Medicine of the Gty Uni versity of New York, New York, N.Y. 10029 Advisory Council of IIHRP Irving J. Selikoff, M.D. Program Director and Chairman E. Cuyler Hammond, Sc.D., Vice President, American Cancer Society, New York, N.Y. Albert Hutchinson, General President, International Association of Heat and Frost Insulators and Asbestos Workers, Washington, D.C. Fred L. Pundsack, Ph.D. Vice Presi dent, Research and Development, Johns-Manville Corporation, New York, N.Y. PURPOSES OF THE INSULATION INDUSTRY HYGIENE RESEARCH PROGRAM (Continued from firit page) in several sizes of plastic bags which have a spout through which water is introduced. Sufficient wa ter is added to moisten the mor tar; after premixing, the bag is opened and the remaining water added. The carton in which the bag is packaged may serve as a mixing box and waste container. b. Precutting pipe covering and block in the fabrication thop Hand-cutting of pipe covering and block should be kept to an absolute minimum. Bend sections, pipe cover lengths, and blocks, should be cut in the fabrication shop on exhaust-ventilated equip ment How the Navy Does It At the Puget Sound Naval Ship yard, cut sections are dipped in water and then packed in plastic bags which are labeled to identify the location where they are to be used. The cut sections are still damp and relatively dust-free when they are applied and the plastic bags are available for use in collecting wastes. c. Pre-scoring blocks Insulation blocks should not be scored at the job site. Blocks which have been pre-scored by the manufacturer can be pur chased, or standard blocks csui be scored in the fabrication shop by using an exhaust-ventilated ga ig saw. d. Insulating pipe assemblies in the shop Some pipe assemblies are quite intricate and are troublesome to lag while in place. A satisfactory method of doing these jobs, purticularly during ship repair, which is employed by the Puget Sound Naval Shipyard, is to re move the assembly in conveniently sized sections and transport them to the shop. Here the old insula tion is removed, any necessary repair of the pipes performed, and the assembled section relagged. Relag in the Shop Not only is dust dispersion re duced, but it is much more con venient to re-lag the section in the shop than when it is in place shipboard. Any insulation which is damaged during transport and fitting is repaired after the sec tions are in place. e. Hand-cutting at job sites Some hand-cutting at job sites is unavoidable. However, dispersion of dusts by these operations can be minimized. A portable downdraft table is used by the Puget Sound Naval Shipyard. This table has folding legs so that it can be carried down companionways and set up conveniently to the work. A small industrial vacuum cleaner is the source of exhaust Scrap is dropped into a plastic bag and a (Continued on third page) 1. To develop improved methods for minimizing ex posure of insulation workers to dusts and fumes encoun tered in their work. 2. To disseminate knowl edge of these improved methods of dust control wherever they may be ap plied advantageously and to offer cooperation, advice and assistance toward their universal adoption. . High temperature mortar packed In plastic bag. Water is added to bag through spout and mortar moistened before opening. The moistened mortar is removed as required and mixing completed in shipping container. All wastes are placed in container and sent to disposal at end of shift Procedure used at Puget Sound Naval Shipyard for handling bend sections. Sections are cut in fabrication shop, dipped in water and placed in plastic bag. The bag is then labelled with the job-site description. APC 004250 Dampening fibrous glass blanket filler before cutting. Note lateral draft hood in-which fabrication is dona. (Continued from second page) dropcloth is placed on the deck under the equipment. /. Fabrication of Pads and Blan kets Pada lor valves and machinery should be fabricated in the shop whenever possible. Amosite has been largely replaced by fibrous glass filling with covers of an asbestos cloth which has been treated with dust suppressants. As an effective means for suppressing dust dispersion and collection, the fibrous glass blanket is unrolled, dampened and reroDed. This pro* cedure insures that all the blanket will be dampened. The blanket and asbestos cloth shapes are cut in the lateral draft booth. g. Housekeeping and Clean-up Essential parts of a dust control program are housekeeping and clean-up procedures. Meticulous attention must be given to re* striding the spread of dust and larger wastes. Use of a dropcloth under a work area vividly illus*, trates how much waste would be distributed over the general area or to lower decks if one were not used. Areas should be cleaned up at the lunch break and the end of each shift, using an industrial vacuum cleaner to collect dust and small scrap. In all possible instances, work men should clean up their own areas. Where work rules prohibit this, the clean*up crew should be under the direction and super vision of the insulation foreman to insure that proper attention is given to this important subjed. Reduction of Dusts by Use of Local Exhaust Ventilation a. Ventilation of Large Power Tools -Band Saws Extensive use of band saws both in dockside fabrication, shops and, on board larger ships such as aircraft carriers make emissions from band saws a major source of asbestos dust. Control devices for such saws have been known for years and are relatively sim ple. Conventional low-velocity, high-volume systems, using a negative pressure baghouse for air cleaning, are pradical in a fixed installation fabrication shop. Because some degree of porta bility is desirable in a temporary shipboard fabrication area, a high-velocity, low-volume dust collection unit is desirable for Portable downdraft table developed by Puget Sound Naval Shipyard for use shipboetd. Lightweight industrial vac uum cleaner is used as the air mover. Note plastic bag for scrap and dropcloth on deck. such use; it may also be suitable for fixed installations. The air mover is an industrial vacuum cleaner which pulls about 50 cubic fed of air per minute past the saw blade at velocity of more than 10,000 feet per minute. This system is a very efficient dust col lector. Units such as this can also be designed to control dusts pro duced by table saws and gang saws. b. Ventilation of Hand Power Tools High-velocity, low-volume collec tion systems control dust emis sions from most small power tools adequately. Saber saws for cut ting pipe covering and rotary saws for cutting asbestos cement board are well controlled with these systems. Control of Number of Workmen Exposed a. Scheduling of Insulation Work Standard industrial hygiene prac tices call for insolating operations which contaminate the atmosphere with toxic materials. Areas where insulation work is being done under conditions in which dust might be created should be iso lated by non-flammable curtains or other means. Whenever possible, work should be scheduled to minimize the numbers of other tradesmen in the area. Ship con struction operations are more readily scheduled than are ship repair or ship-breaking jobs. However, every effort should be made to keep the number of men exposed at a minimum. In par ticular, rip-out of old insulation should always be isolated and, if necessary, performed on an offshift Trained workmen supplied with proper protective equipment should always be used for rip-out work and it should be scheduled for rapid completion. Personal Protective Equipment In addition to dust suppression and Just control procedures, personal pro tective equipment is often necessary to reduce exposure and limit the spread of contamination. The equip ment described below is used in con trol programs. a. Protective Clothing Protective clothing is required to keep contamination confined to the work areas. One method is to issue disposable coveralls which can be removed when leaving the (Continued on fourth page) Use of dropcloth to contain wastes and facilitate clean-up. APC 004251 A small Industrial vacuum cleaner being used by a Local 62 asbestos worker (or dean-up. (Continued from third page) work area or some time prior to entering the locker room and - placed in plaatic bags for disposal. Retin Impregnated Paper A satisfactory type of protective clothing consists of resin impreg nated paper coveralls. These are inexpensive and readily disposa ble. They prevent spreading con tamination to laundries and elimi nate pilferage. They are worn for one shift, then removed and placed in plastic bags for disposal with other asbestos-containing wastes. b. Respiratory Protective Equip ment Occasionally some operations gen erate so much dust that it is virtually impossible to maintain satisfadory atmospheric concen trations of asbestos fibers and respiratory protection must be provided to the workers. A variety of respiratory protective equip ment is available from which devices suitable for various situa tions can be selected. American National Standard Z8&3-1971, Safety Guide for Respiratory Pro tection Against Asbestos-Contain ing Dusts (obtainable from Amer ican National Standards Institute, 1430 Broadway, New York, N.Y. 10018) should be referred to for detailed information. Invisible Dust It is emphasised that unsatisfac tory amounts of respirable dust can be present in tne air even though conditions are not visibly dusty. I. Air-supplied Respirators Extremely dusty jobs, such as ripout of old insulation where dust concentrations are very high, re quire use of air-supplied respi rators which will deliver cle.an, dust-free air to a facepiece or hood. Two general types are available: air-line and self- Saber saw equipped with high-velocity, low-volume exhaust system. powered. a) Air-line respirators in which air is supplied to a hood, helmet or facepiece give the greatest de gree of protection. Air is fed to the facepiece from a compressed air-line. The air source must be located in an uncontaminated area and if the source is not specifically designed for breathing purposes, a temperature sensing alarm must be installed on the compressor or a carbon mon oxide monitoring device must be installed in the air-line. Disposable Hood Anti-freexe compounds should not be used in the compressor system; water vapor must be removed by dessicant and oil mists removed by a filter. A plastic, disposable hood has been developed by the Puget Sound Naval Shipyard for situ ations where a very high degree of protection is required. This hood and other similar ones are available commercially. The air line should be fastened to the hood with a quick-disconnect fitting. Self-powered Respirators b) Air-line respirators connected to a compressed air supply limit movement, and this limitation can be troublesome. Self-powered res pirators do not impose such limi tations, but they do add to the equipment the workman must carry and they also require care ful maintenance. 2. Particulate-filtering Respira tors There are several types of par ticulate-filtering respirators. Those with a half-mask facepiece are considered most suitable for use by insulators. Only those ap proved for protection against as bestos dust by the U. 5. Bureau of Mines should be used. These devices are recommended for use in situations where the atmos pheric concentration of asbestos fibers is at relatively low levels. All the recommendations for res pirator-fitting, training of work men and maintenance, deUiied in Z88-3-1971 should be folh.wed. a) Reusable particula. e-filter ing respirators A variety of reusable particulate filtering respirators are available. To insure proper fitting, several different makes should be avail able from which the workman can select one. No one model respira tor facepiece will fit all faces. Routine maintenance is absolutely necessary to replace clogged filters and leaking inhalation or exhala tion valves. Unmaintained res pirators produce a false sense of security. Maintenance Troublesome b) Disposable particulate-filter ing respirators Operation of an adequate respira tor maintenance program can be troublesome and, if only a few men are involved, impractical. Disposable respirators are avail able which are designed to be worn for no longer than one shift and then discarded. Education and Training No dust control program can be effec tive unless workmen and supervisors understand the hazards associated with the jobs, the sources of the hazards and the reasons for following recommended procedures carefully. Understanding is only obtained by education of personnel and training in correct operating procedures. For an education and training program to be successful, both management and labor must be concerned and partici pate. As with all safety programs, it is essential that first-line supervisors be interested in and cooperate in the work. The harmful effects of neglect of pro cedures for controlling asbestos dust are not apparent for many years. Therefore, it is more difficult to con vince workmen and supervisors of the necessity of following rules for working with insulating materials than if more obvious physical haz ards were involved. Education in hazards associated with use of insulating materials and in struction in correct work practices should be included in apprentice training programs. PHOTO CREDITS: Pg. 1, I.I.H.R.P.; pg. 2, Ryder Industries and Puget Sound Naval Shipyards (P.S.N.S.); p. 3, P.S.N.S.; pg. 4, I.I.H.R.P. and P.S.N.S. APC 004252 RULES AND REGULATIONS 23207 To be a valid assay. the percent column recovery should be 1002 percent. (S> Identity. Proceed aa directed In 1141.821 of this chapter, using a 0.8 percent potassium bromide disc prepared as described In paragraph (b)(1) of that section. (7) Crystallinity. Proceed as directed In 1 141.604(a) of this chapter. 1150g.ll Minocycline hydrodiloridc capsule*. (a) Requirement* lor certification-- (rt Standards of identity, strength, ovality, and partly. Minocycline hydro chloride capsules are composed of mino cycline hydrochloride and one or more suitable and harmless lubricants and dil uents enclosed in a gelatin capsule. Each capsule contains minocycline hydro chloride equivalent to 100 milligrams of minocycline. Its potency Is satisfactory tf it Is not lees than 00 percent and not man than 118 percent of the number of milligrams of minocycline that It Is rep resented to contain. Its moisture content is not mare than 12 percent. The mino cycline hydrochloride used conforms to the standards prescribed by I ISOg.Ka) (1). (2) Labeling. It shall be labeled In ac cordance with the requirements of i 148.3 of this chapter. (3) Request* Ice certification; sam ple*. In addition to complying with the requirements of 1146.2 of this chapter, each such request shall contain: (1) Results of tests and assays on: (a) The minocycline hydrochloride used In malting the batch for potency, safety, moisture, pH. minocycline con tent, Identity, and crystallinity. (b} The batch for potency and moisture. (ID Sample*required: (a) The minocycline hydrochloride used ht mating the batch: 10 padngea, each containing approximately 300 milligrams* (t The batch: A minimum of 30 capsules. (b) Tests and method* of auay--(X) Potency. Proceed as directed in 1141.111 of this chapter, preparing the sample for assay as follows: Place a representa tive number of capsule* into a high-speed glass blender Jar with sufficient 0.1N hydrochloric add to give a stock solution of convenient concentration containing not less than 160 miengrains of mino cycline per mllUllter (estimated). Blend for 3 to S mlnutea. Remove an aliquot and further dilute with O.Utf potassium phosphate buffer. pH U (solution 4), to the reference concentration of 0.104 mierogram of minocycline per milliliter (estimated). (2) Moisture. Proceed as directed In 1 141.502 of this chapter. Data supplied by the manufacturer concerning the subject antibiotic have been evaluated. Since the ennditimy pro- requisite to providing for its certification have been compiled with and since not delaying In so providing Is In the public Interest, notice and public procedure anl delayed effective date are not prerequi sites to this promulgation. Effective date. This order shall be ef fective upon publication in the Federal Registei (12-7-71). (Sac. 807. SB Stat. 403, aa amended; 21 0.S.C. 387) Dated: November 21. 1871. H. E. SnoioMS, Director, Bureau of Drug*. (FR DOC.71-17TT3 riled 12-8-71:8:46 am] Title 23--LABOR Chapter XIII--Bureau of Labor Standards, Department of Labor PART 1516--SAFETY AND HEALTH REGULATIONS FOR CONSTRUCTION Standard for Exposure to Asbestos Dust Pursuant to section 4(b) (2) of the Williams-Steiger Occupational Safety and Health Act of 1870 (84 Stat. 1882, 28 UJ3.C. 653), 11518.S5 Of Title 29. Code of Federal Regulations, Is hereby amended in the manner indicated be low In order to prescribe a new stand ard limiting the exposure of workers to asbestos dust. The new standard limit ing the exposure of employee* to asbes tos dust is that adopted under section 6(c) of the WUliams-Steiger Occupa tional Safety and Health Act of 1970 and published In tbs Federal Rientn on this date. The standard Is hereby de termined to be more effective than that presently provided under i 1518.55 to the extent that it prescribes minimum levels of exposure to asbestos dust. Therefore, by operation of section 4(b) (2) of the Act the new standard issued under section 6(e) supersedes the con struction safety standard relating to ex posure to asbestos dust Section 1518.55 Is hereby amended by adding a new paragraph (e) thereto. As amended 11518.68 reads as fallows: 11S18.S5 Cases, vapors, femes, duMa, and mist*. a () Paragraphs (a) and (b) of this sec tion do not apply to the exposure of em ployees to airborne asbestos dust When ever any employee is exposed to airborne asbestos dust the requirements at f 1910.93a of this title shall apply. Effective date. This amendment shall become effective upon publication In the Federal Register (12-7-71). (8m. 4(b)(2), 84 Stat 1503, 28 0JB.O. S63; Sscrstary'* Order No. 19-71, <6 FJt 8784) Signed at Washington. DC. this 2d day of December 1971. Q. C. Qcentkxr. Assistant Secretary o/ Labor. [FR Doc.71--17835 Filed 12-4-71:8:47 am) Chapter XVII--Occupational Safely and Health Administration, De partment of Labor PART 1910--OCCUPATIONAL SAFETY AND HEALTH STANDARDS Emergency Standard for Exposure to Asbestos Dust Pursuant to section 6(c) of the Wtlliams-Steiger Occupational Safety and Health Act of 1970 (84 Stat 1586, 29 U.S.C. 6SS), Part 1810 of Title 39. Code of Federal Regulations (36 FJt 10466. May 29, 1971) is hereby amended in the manner indicated below In order to pro vide an emergency standard dealing with the exposure of employees to asbestos dust In light of Increasing Information on the results of exposure of employees to airborne asbestos dust. Including recent studies by the National institute for Oc cupational Safety and Health and others, and recommendations by the American Conference of Governmental Industrial Hygienists (ACGIH), It Is hereby deter mined that (1) exposure under the pres ent standard for asbestos dust in Table 0-3, 11910.93, of 13 fibers per milliliter greater than S microns In length or 2 million particles per cubic foot of air, which Is derived from an established Fed eral standard promulgated under the Walsh-Healey Public Contracts Act on May 20, 1969, constitutes a grave danger to employees exposed to this 8-hour time-weighted average concentration; and that (2) an emergency standard is necessary to protect employees from this excessive exposure. The National Insti tute for Occupational Safety and Health concurs that the' proposed change In the asbestos dust standard recommended by the American Conference of Governmen tal Industrial Hygienists should be the substantial base for the emergency standard. Action concerning the standard will be commenced under section 6(b) In the Immediate future. Any notice of pro posed rulemaking under section 6(b) wilt give notice of the emergency standard as a proposed rule and also of any ap propriate subsidiary proposals which may be required under subparagraphs (5) and (7) of section 6<b) relating to the ex posure of employees to toxic substances. Part 1810 is amended as follows: 1. Table 0-3 following i 1910.93 (36 FJt. 15104. Aug. 13, 1971) Is hereby amended by deleting the following: Asbeetoe a Sbera par milliliter graatar than 5 miaous U length at1 Mppef. Tremome-............ i tippet. aorngyiP "tTbio, Wa.3 FEDERAL REGISTER, VOL 24, NO. 234--TUtSOAV, DECEMBER 7. 1*71 APC 004253 23208 RULES AND REGULATIONS Aj aidended. Table 0--3 reads as follows: Tajlb 0-0--Mineral Dorrs BobtUses Uppd ki|/M* Bilks: OmUQlns: Quit* (rwplrmbls)............. HO1 ttms/M* \ %BI0rl- \ Qurti (total dost)................................. mjfU* OfMatattu UwMthe nhn *--* tb gooat or mtm fararalat far qerrtt. Tridyalta: Tim H tbi nto eelnnlsMil Ana bifar- male* far quarts. Aaoftfaau, toclwHnq natural dlatanaaoMiia certs_________ __ 26 SOmc/M* master (laaa than 1% ay*- taQUIalaafa..U..e.a..).:.................... 20 Boaimtoaa............................ ? Tata_................................ Partlaad aamant................. to Oraffaite (natural)................. It Coal dost (nuSnbl* fmelloa IMS than t% MOt).................................. %aiQi 2.4mg/M> far mam than t%S10w............................ liiKt m VnlatfiM DtttL' BsspfasMs frsertos............. Total dual........ ................ II 80 lOtna/yt1 %fllOH-2 6mt/M Norn Goarnloo laelora-- rappoOCSM-mlllloa paitteles per cubic meter partkke perc.c. MDBom of partfctao per cublo loot of air, booed on tmplrmr mmptao oooated by Ufbt-flold teebnks. * Ibt pweoDtafs of eryitallloo Slice la the lomnda b the amount delormlned from elr-borne eampleo, ex* eept la them Instaaeee In which other methods bare been fitaft |g IppUeobtO. I As detenarnod by the membrane Alter method et 430Xpheee oontreet mocalfleoUon. Both eooeeBtradoa end pecoeot qoorte far the appU* eetloo of thb limit ere to be determined from the fraotloa pemtnc n ebe selector with the loUowloc chencterteUa: AwodynBrnk dteatlcr (anil 4*adtj Bptaert) FtfetfU p>Hln< ekelor 3 IS 1N. aJ.sI 10 90 74 80 20 0 the meoonnmeati onder thb note tefer to the am of on ASO Instrument. If the respirable fraction of eoal dost b determined with a MRS the flsurs corresponding to that of 3.4 Ms/M> In the table lor cool dust b 44 Mt/W, 2. A new 11910.83a to added to Part 1910. The new 11910.83a reads as follows: 9 1910.93a Aabenlon dust. (a) The 8-hour time-weighted aver age airborne concentration of asbestos dust to which employees are exposed, shall not exceed S fibers per milliliter greater than 6 microns In length, as de termined by the membranes 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 IS minutes in an hour for up to 9 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 scribed In paragraph (a) of this section. Where such engineering methods are not feasible, or do not otherwise reduce the concentrations below those prescribed In paragraph (a) of this section, respira tory protective devices shall be provided and used in accordance with paragraph (c) of this section. (c) (1) O) When the limits of ex posure to asbestos dust prescribed In paragraph (a) of this section are ex ceeded and when engineering controls required by paragraph (b) of this section 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). (11) 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 ployer shall further provide for effective training or supervision of employees In the testing of respiratory protective de vices fbr fit before their use. (2) For an atmosphere containing not more than 25 fibers per milliliter greater than 6 microns In length over an 8-hour average, or more than 50 fibers per milli liter over any period of 15 minutes, a reusable or single-use filter type respira tor, operating with negative pressure during the inhalation phase of breathing, approved by the UJS. Bureau of Mines under the provisions of 30 CFR Part 14 (Bureau of Mines Schedule 21B), or a valveless respirator providing equivalent protection, shall be used. (3) For an atmosphere containing not more than 250 fibers per mlllllter greater than 5 microns in length over an 8-hour average, or more than 600 fibers per milliliter over any period of 15 minutes, a powered filter positive pressure res pirator approved by the UjB. Bureau of Mines under the provisions of 30 CFR Part 14 (Bureau of Mines Schedule 31B> Shall be used. (4) For an atmosphere containing more than 250 fibers per milliliter greater than 5 microns in length over an 8-hour average a type C positive pres sure supplled-air respirator approved by the UB. 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, cleaned, repaired and stored. (d) (1) When an employer has em ployees who are exposed to asbestos dust exceeding the limits prescribed in para graph (a) of this section and the ex posure results from the operations de scribed in the remaining subparagraphs of this paragraph (d), the employer shall comply with the requirements of these subparagraphs relating to the operations Involved. The requirements of this para graph are In addition to those prescribed In paragraph (b) of this section. (2) All hand- or power-operated tools which produce asbestos dust such ss, but not limited to. saws, scorers, abrasive wheels, and drills shall be provided with local exhaust ventilation and dust col lectors In accordance with the American National Standard Fundamentals Gov erning the Design and Operation of Local Exhaust Systems; ANSI Z9.2--1971. (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 (e)(4) of this section. (e) Asbestos cement, mortar, coatings, grout, and plaster shall be mixed in closed bags or other containers. (f> Asbestos waste and scrap shall be collected and disposed of in sealed bags or other containers. (g) All cleanup of asbestos dust and blowing shall be performed by vacuum cleaners. No dry sweeping shall be per formed. 3. Section 1910.12 to amended by changing paragraph (a) in order to apply the emergency standard prescribed in the new 11910.93a, which to published In this document, to construction work which to subject to the Act. Hie amendment to necessary In light of the rule of regula tory construction set forth In 11910.5(c). As amended, 11910.13 reads as follows: 1910.12 Construction work, (a)(1) Adoption and extension of es tablished safety and health standards tor construction. The standards pre scribed by Part 1518 of this title and in effect on April 28, 1971, are adopted as occupational safety or health standards under section 6(a) of the Act and shall apply, according to the provisions thereof, to every employment and place of employment of every employee en gaged In construction work. Each em ployer shall protect the employment and places of employment of each of his employees engaged In construction work by complying with the appropriate standards prescribed by this paragraph. (2) The standards prescribed In I 1618.53(c) of this title shall apply In the case of the exposure, of any em ployee In construction work to airborne asbestos dust. 88 989 Effective date. These amendments shall become effective immediately upon publication in the Fedxxal Rtoistxx (12-7-71). (See. 6(e), M SUt. ISM. 29 VS.O. 856: Sec retary's Order No. 13-71, SS F-R. STM) Signed at Washington. D.C., this 2d day of December 1971. G. C. Ooximtia. Assistant Secretary of Labor. (FB Doo.71--178S3 Filed 13-8-71:8:47 em) ,FEDItAl IfOISTU, VOL IS, NO. 234--TUI50AY, DIC2MSU 7 1*71 APC 004254