Document 2jz9wbRnZppyK4Qp3m3JQKdZg

E. I. du Pont de Nemours & Company Mco*^o**ro Wilmington. Delaware imm ENGINEERING department louvicrs building cc: 2. G. Windsor-Enp.Rel.-Wilm. Subcommittee Members J. D. Anthony - ERD H. A. Heidelberger - Design C. F. Reinhart/R.J.Hubiak-Emp.Rei.- Haskell Lab J. S. Queener-Emp.Hel.-Wilm. A. R. Sassaman-Tex.Fib.-Exp.5ta. A. J. Geib - F & F - Wilm. C. W. Bowen-5iochem.-V.ilm. September 11, 1972 Serial Letter 4013 R.L.CARLTON, BIOCHEM., WILM. (2) H.E.ROBBINS, CENT. RES., EXP.STA. (2) H.3.EATON, ELASCHEK, WILM. (9) J.C.BRECKENRIDGE.EMP.REL. ,WILM. (1) C.D.BROWN, CONSTRUCTION, LOUVIERS (1) R.F.STEWART, DESIGN, LOUVIERS (8) J. ?.KLIMOWICZ, ERD, EDL (1) F.J.MAHTIN, ESD, LOUVIERS (1) H.H.hOHL, F&F, WILM. (12) V.E.NEFF, FILM, WILM. (7) V.H.MC COY, IND.CHEM.,WILM. C.W.ANDRUS,INTL., WILM. J.V.FLYNN, ORCHEM, CH.WhS. J.J.LAURINO,PHOTO PROD.,WILM. R.H.MC CONNELL,PIGM..EDGE MOOR K.W.DAHL, PLASTICS, WILM. T.C.HILL, POLYMER INTER., WILM. H.G.SHULBY,PURCHASING,LOUVIERS J.A.SIGMAN, TEX.FIE., WILM. R.H.GRUSS,REM.ARMS,BRIDGEPORT \L; 11) (c) (5) (6; ;~) .11) .2) STANDARDS SECTION - SAFETY & FIRE PROTECTION SUBCOMMITTEE The following new standard is forwarded for its second review. Please return your comments or approval on the attached form by October It, 1971. 3*T - ASBESTCS DUST EXPOSURE, MEASUREMENT AND CONTROL The above standard was submitted initially November 3, 1971, and a number of comments were received. It was followed closely tv the issue of an emergency,temporary Standard for Exposure.to Asbestos Dust under the Occupational Safety and Health Act (OSHA) on December 7, 1971. The permanent regulation was issued on June 7, 1972. In view of the comments, the new regulations, and the subsequent discussions concerning the proposed revised star.aard, it is being resubmitted for further approval cr comments. The standard has been reorganized to include the essential requirements of the C5HA regulations ana facilitate compliance. The Employee relations -apartment currently is reviewing two items for possible aooitior. to the a. ; statement that CSHA regulations also cover r.edica* examinatiun- and records. The latter previously were consioereo outsiue tne scope of suer, a stanoara. ur.-wompar.y :i_ter cou. investigatea currentl; capaoi ect < ; r. = - -- DUP 1153842 DU 062070 TOXICITY MEASUREMENT AND CONTROL OF ASBESTOS DUST EXPOSURE ISSUED SAFETY ENGINEERING STANDARD S4T Page 1 of 5 Any portion of thi or referenced document printed in rod is a mandatory requirement of tho Willioms-Stei Occupotionol Safoty and Hoolth Act of 1970 (OSHA) at publisKod in the Fodoral Ronistor. 1. SCOPE h This standard presents the permissible exposure 2 V limits to asbestos dust, general information on methods Ul * U of controlling asbestos dust exposures, and describes an Ul 0 acceptable method of sampling asbestos dust concentra tions in the work area. 'i % n 2 Ul 0 U ul 82 < *5 ot 5* Z0 Z GENERAL Z1 Asbostosis and lung concur have long been associ ated with exposure to asbestos. Historically, the incidence of these diseases has been significantly higher among asbestos workers than among the general population. Z2 Principal sources of exposure to airborne asbestos dust in Company operations have been: < 3 ft t-- a z - 0z wU U0 o2 a. Cutting insulation by power saws in fabrication shops b. Opening boxes and removal of new insulation c. Removing old insulation from lines and vesaels d. Mixing asbestos to form cement ft. 0 0 z a. Removal of clothing after completing insulating 25 duties wI *1 f. Cutting asbestos shingles, Transite, etc V-i wE 5S g. Spraying insulation or fireproofing T! 35 h. Asbestos materials used in production of Com 0 ? pany products 0<n 10 Z3 Permissible Exposure limits. Asbestos dust concen- it ; tralions in air shall not exceed an 8-hour time-weighted ! average (TWA) of 5 fibers longer than 5 microns per cubic centimeter (cc) of air. At no time may the concen zo tration exceed a ceiling of 10 fibers longer than 5 microns per cc. Z3.1 The 8-hour time-weighted average (TWA) is the average concentration occuring over a period of 8 continuous hours. Z4 Control methods, such as hut not limited to, enclo sure, vacuum sweeping, and local exhaust ventilation, shall be used to meet the permissible exposure limits,^ i section 3. Z5 Respiratory protective devices, shall be provided and used where such control methods are not feasible, or do not otherwise reduce the concentrations below the permissible exposure limitajsec section 4 Z6 Hygiene requirements are included in section 5. Z7 Sampling. For sampling equipment, monitoring, analysis record keeping, and warning signs, see section 6. ZS Nonqsbestos bearing materials should be substi tuted where asbestos contributes to a dust concentration exceeding the permissible exposure limits. 3. CONTROL OF ASBESTOS DUSTS 3.1 Handling Asbestos Insulation 3.1.1 Cartons of block insulation are a potential source of severe dust exposure and should be handled with care. The rough, abrasive nature of the block mate rial creates dust within the cartons. 3.1.2 Cartons of new insulation should be vacu umed upon opening, and prior to removal of blocks, to remove dust. * 3.1.3 Asbestos blocks must be handled with care . at all times to minimize dusting. 3.1.4 Purchase of biock insulation with a glaze coating is recommended. This makes it virtually dust free for handling purposes. 3.2 Asbestos Cutting Operations 3.1) All hand-operated or power-operated tools which may produce or release asbestos fibers in excess of the permissible exposure limits shall be provided with a dust collection system, see 3.6. Z3.2 After July 1, 1976, the TWA is reduced from , 3.Z2 All major power-cutting machines should be 5 to 2 fibers longer than 5 microns per cc. 1 isolated in a separate working area. inPortions prlntsd In rsd mssf OSHA regulations, Soctlon 1910.93o ; Vendors and merchandise designations or* given to describe materials and may |not include oil oeeeatoble produets. Substitutions by suppliers oro to bo mod# [only on approval of tho loeal authority Initiating tho uso of this standard. DUP 1153843 SUBCOMMITTEE NO. tl DU 062071 S4T, p 2 MEASUREMENT AND CONTROL OF ASBESTOS DUST EXPOSURE 3.2.3 The work am shall havr a vacuum cleanup ' syslrm. This can be a system of hoses connected to a central vacuum system. All parts of the room must have daily vacuum cleanup of ledges, shelves, floors, and machines. ] CAUTION: No dry sweeping shall be performed. Air 1 /hose is not to be used as an aid in cleanup. 3.3 Asbestos-Cement Mixing i 3.3.1 Asbestos cement, mortar, coalings, grout, and {plaster shall he mixed in closed bags or other containers. b. No bypass devices c. No leakage of unfiltered air d. Ability to empty hoppers without Treating visible emissions of particulate matter a. No torn or ruptured hags f. No worn or lhr*adbarr hags g. No improperly positioned bags 4. RESPIRATORY EQUIPMENT 3.3.2 Any dried-out cement should be discarded. Do not attrmp to rework it. 3.4 Removal of Asbastos insulation 4.1 Respiratory protection shall be provided to all j personnel in areas where the permissible exposure limits: may be exceeded,j Refer to S2H for general description of | equipment. 3.4.1 Insulation to be removed and discarded should be dampened prior to and during removal . whenever possible. | 3.4.2 Employees engaged in dismantling asbestos insulation shall wear atmosphere supplying respirators, 1 see 4.1,1. 4.1.1 Abnoepharo supplying respirators (Type"C" supplied-air or self-contained), Bureau of Mines Schedule 19B. will provide complete protection.iThev are required | lor dismantling and spraying asbestos, or when the I concentration exceeds 10 times the TWA or ceiling limit of 2.3. I 3.4.2.1 The removal of insulation, fabricated and j protected to withstand repeated removal and remstal- , lation for equipment maintenance or other reasons, is J not considered "dismantling." I 3.4.3 Scrap insulation shall be collected and dis Leed of in labeled and sealed bags or other containers and shall follow plant and local government regulations. For caution labels, sec 6.6. 4.1.2 Mechanical filter-typ# respirators. Bureau of Mines Schedule 21B, will aflord adequate protection in lower concentration cases, and where ambient oxygen does not fall below 18 percent iThey are required when the concentration is between 1 and 10 times the TWA or ceiling limit of 2.3.1 Manufacturers recommendations for their application and maintenance must be followed. 3.5 Asbestos Spraying. Employees engaged in spraying asbestos for insulation or fireproofing shall wear atmosphere supplying respirators,jsee 4.1.1. j j 3.6 Exhaust ventilation and dust collection system shall j j be in accordance with ANSI Z9.2, Fundamentals Gov- | erning the Design and Operation of Local Exhabst Systems. _ 3.6.1 Caps or dampers should be provided in | each intake hose and machine connection to maintain ' capacity of the system. However, care should be taken to assure that connections are open at the equipment bring operated. 3.6.2 Discharge should be into bag fillers which mrel the following criteria: a. Cotton hag filler having air (low permeability not exceeding 20 cfm/xq ft 4.2 Each employee shall be instructed in testing respira tory devices for proper fit and be required to do so prior to each use. 5. HYGIENE 5.1 Respirators and masks must be kepi cicar. and sterilized prior to reissue. 5.2 Special clothing, a change room, and duplicate lockers must be provided for employees exposed locnncentratioqs which exceed the ceiling limit of 2.3. This is to prevent contamination of employees' street clothes from their work dot hes. 5.3 Food, gum, tobacco, or other material placed in the mouth should not be kept or consumed in work areas. lo"* pflntwj In OSHA fgulotlont, Section 1910.93qTJ j'i'lUQi DU 062072 ST. MEASUREMENT AND CONTtOl OF ASIESTOS OUST EXPOSURE S4T Foge 3 8. SAMPLING i. I Monitoring. Sampling nf each operation must br fnr m leu*t 1.1 minute* duration and taken in a frequency nnd imlirrn in arrurnlclt represent the employee's ex. pnrr urn his work period. If mulls indicate a level , nf niwin* dust in exceeds of ihr limit, the operation , *hnuld br reviewed m reduce exposure. see 2.4. and I resampled. Thr initial samplinf program must determine ' Ihr 8-hour lime weighted average. Intervals between 'ample* shall not exceed six (6) months. 6.2 Equipment. Samples may be taken with a portable batters-operated air sampler attached to an employee's belt or placed in the work area. CAUTION: Samples may not be collected in basardoua areas, as defined in DEID. without a permit to use a spark producing device. 6.2.1 Pump Mirronaire or Model Cl 15 Bendix Corp Environmental Science Diviaion Towson. Md 21204 or Gravimetric or Monitaire Mine Safety Appliances Co 230 N. Braddock Ave Pittsburgh. Pennsylvania 15208 Either unit must include battery charger and battery; carrying rase is optional. 6.12 Filter Millipore No. MAWP--037--AO filler, while. nongriddcd. 0.8 micron pore j (lillipore Corporation Bedford. Massachusetts 01730 6.3 Procedure 6.3.1 Flow through the pump should be calibrated, with the filler in line for each pump. 6.3.2 Clip filler holder in lapel or shirt pockri a. close ns possible to the person * mouth. This method nf personnel snnipling i* preferred 6.3.3 If a sampler is affixed permanently in u work area, suspend the filler iis close n* |w>**il>lein die |Kr*iui breathing tone at the job to hr monitored. 6.3.4 Remove top section of the filter to expo*e ihe full filter face. 6.3.5 Turn on pump and set at approximate!' two (2! liters per minute rale. Check rate periodically. When finished sampling, turn off pump and record elapsed sampling time. Sampling record forms. EN--2731 (see Figure 3) are available from Stalionerv Stores. Eng Dept. Wilmington. Del. 6.3.6 Replace filter lop after sample is collected and aeal with tape prior to shipment. 6.4 Analysis. Completed samples (exposed fillers I are placed in mailing lube, sealed, and sent to a qualified laboratory with two copies of the sampling record. Indude an unexposed filler with the sample which has been handled in the same fashion without drawing air through it. Qualified laboratory information is available from Haskell Laboratory.* I 6.4.1 All determinations shall be made by the mem- ! brane filter method at 400--450X (magnificationI (4mm ! objective! with phase contrast illumination. | I 6.3 Rocord Reaping. Record* of personnel and environ- I mental monitoring shall be maintained for three (3) years i and made available upon the request nf authorized rep re- ' senlatives of OSHA and NIOSH f .National Institute of | Occupational Safety and Health!. , 6.6 Warning signs conforming to Figure 1 shall br j posted at all approaches to areas where asbestos eonrrn- (rations may be above permissible exposure limits ai a sufficient distance to permit an employee to read me s.gns and take necessary precautions Delore entering the area. Caution labels conforming to Figure 2 shall be used to identify containers of raw materials, scrap, waste, otner products containing asbestos, and asbestos contaminated clothing. Portion* printed in rod moot OSHA rogulotfons. Section ! 910.93a. DUP I 153845 DU 062073 $41 S4 T measurement and control OF ASBESTOS DUST EXPOSURE YHow Utter* on block boekground Block lotton on yoliuw boekground Latter *rtot ond stylo* to bo of Ippot Of vi 11 bi0 OB that llltod bolow I Sons Serif, Gothic,or Block 3 Son* Serif, Gothic, or Block * Gothic 1 -- i u al height of tho uppor of ony two line* - Ps 1 0AW.TION ASBESTOS DUST HAZARD Avoid broothing dwtt *>fnd protective equipment Do not remain In oroo vnleee yeur work require* It Breathing dwot mey bo heserdeu* to you? health FIGURE 1 - CAUTION SIGN - ASBESTOS OUST CAUTION Contain* oobesto* flbort Avoid creating dui* | Breathing aiMttoi dust j moy cou*e aertou* bodily j harm i Laboi sue ond printing to bo roodily viBlblo ond logiblo. FIGURE 2 - TYPICAL CAUTION LABEL od 2 moot OSHA requirement*, Socflon 1 9'0.93 , 0 up 1 '53846 DU 062074 IXJ731 MEASUREMENT AND CONTROL OF ASBESTOS DUST EXPOSURE E. i. DU PONT DE NEMOURS & CO.-CONSTRUCTION DIVISION AIRBORNE DUST SAMPLE WORK SHEET1 2 SITF WfATUfD INSTRUMENT NUMBER: SAMPI F TOTAI TIMF TFMP DATE SAMPLED: QH WORK LOCATION: HRS. VOL. SAMPLED: 1. PUMP RATE:CC/M TIME:CHECKED BY: SPECIFIC PRODUCT AND MATERIAL. OPERATION: VENTILATING CONTROL: DRAFTS. 2. PUMP RATECC/M TIME:CHECKED BY: SPECIFIC PRODUCT AND MATERIAL. OPERATION: VENTILATING CONTROL: DRAFTS: 3 PUMP RATE CC/M TIMECHECKED BY SPECIFIC PRODUCT AND MATERIAL: OPERATION: VENTILATING CONTROL. DRAFTS: *. PUMP RATE:CC/M TIME:CHECKED BY: SPECIFIC PRODUCT AND MATERIAL: OPERATION: VENTILATING CONTROL. DRAFTS 5. PUMP RATE .CC/M TIME. .CHECKED BY 6. PUMP RATECC/M TIME:CHECKED BY. SPECIFIC PRODUCT AND MATERIAL. OPERATION: VENTILATING CONTROLDRAFTS. 7. PUMP RATECC/M TIMF SPECIFIC PRODUCT AND MATERIAL OPERATION VENTILATING CONTROL. DRAFTS ______________ CHECKED BY: 8 PUMP RATE CC/V TIMECHECKED BY SPECIFIC PRODUCT ANO MATERIAL OPERATION VENTILATING CONTROL DRAFTS S PUMP RATE _________ CC/M TIME ____ ________________CHECKED BY __________ SAMPLE TAKEN BY SlONATUflC .DATE FIGURE 3 - TYPICAL SAMPLING RECORD FORM SiT Pag* 5 qUP 1153847 DU 062075