Document bOV7vkdNryJm2L858k31YMwek

iJaMSl **#?* l-i.nis gaaBaiBi^gaff US3 1 39 SiT.Cl + I \ MEASUREMENT AND CONTROL OF ASBESTOS DUST EXPOSURE C iZ TH ; ? PviSEC STANDaRC R A-riPMET SAFETY ENGINEERING ST APRIL 1973 OCT 1985 NOV 1984 S4T Page 1 ol 8 This standard includes requirements o' the Occupational Safei> and Health Act of 1970 (OSHA) as published in tne Feoera' Reaister OSHA information is pnnted in red 1.SCOPE 1.1 Thi** standard present* the permissible a*b<**IOi* duM exposure limit*, methods of controlling ahc*los dust exposures, special OSHA requirement** foi removal of asbestos insulation, respirator) protective equipment, and method of sampling asbesto** dust concentrations in the work areas. It provides sufficient information to cotnplv with OSHA and EI\A regulations but guidance from the I)u Pont Legal Dept (via the Departmental OSH Coordinator) should be sought whenever an interpretive problem arise"*. b. Removing, handling, and laundering of a<-hesto>*rontaminated clothing C. Cutting new or removing weathered asbestos cement (Transit?) siding, roofing, pipe. etc. or Haveg pipe and equipment d. Maintenance and operation of machinerv and vehicle brake lining** C. Opening boxes and removing new asbestos materials 1.2 An Asbestos Compliance Package can he obtained from the Occupational Health and ater Treatment group of ESD. Ref (1) contain* extensive additional information. 1.3 A comprehensive hook on asbestos removal and control has been published. Ref (14). It contains useful and detailed information on ashesto* removal tech* nique*. monitoring, and disposal. Also included are checklists for removal jobs and sample specifications for contractors, Th< removal technique detailed in the book is called ''negative air filtration*' and involves the use of a portable. HEPA equipped powered exhaust unit. That technique is abo explained in an Environmental Protec* tion At*enr\ report that ha* been reprinted under the title "Controlling A*Im**w* Contamination with INegative Air Filtration Svstems." Ref (]5i. The report contains a de tailed operating proeedun for asbestos removal and an evaluation form that would Ik useful in auditing the re* nioval job. It also contain** much of the same information in the more expensive* book identified a* Ref (14). 2. GENERAL 2.1 Asbestosis and cancer are associated with over exposure to asbestos. Historicallv. the incidence of these diseases has been significant!) higher among ashesto*. workers than among the general population Cigarette smoking greallv increases the incidence of respirator) cancers arising from exposure to asbestos. Asbestosexposed persons who smoke have a 53-fold increase in risk from lung cancer over nonsmokers. Ref (2). f. Handling asbestos materials used in production of Companv products 5. Repair of laboratorv equipment with asbestos insulated heaters, e.g.. ga* chromatographs, lab ovens h. Cleaning and maintenance of vacuum systems for collection of asbestos fibers I. Asbestos welding blankets and cloths j. Removing old asbestos floor tile and adhesive 2.3 Suitable* nonasbeslo* substitute* should b* u**<*d where practical and feaihh whenever the u*e of asbestos-containing material* can release a*be*to* fibers. ESD can furnish information on a.be*to* substitutes. 2.4 Some materials containing bound a*besto* filters, e.g.. Tran&ite siding or roofing, are not hazardou* dur ing normal use. Examples are: bonded compressed as bestos gaskets, asbestos roofing felt. Teflon' impregnated asbestos packing and fibrated asphalt cut back (mastic). These materials could become hazardous if asbestos fibers are released because of loss of binder or a ph> sical action such as grinding. Supervision should inspect use of these materials to determine if respirators are needed. 2.2 Principal potential sources of exposure to airborne asbestos dust in Companv operations are: 2.5 A material which contains asbestos which might become airborne should he treated as asbestos unless it is determined that the asbestos present is not a potential a. Removing old asbestos-containing insulation health hazard. Talc, vermiculitc. and other minerals are from lines and vessels, including gaskets on high- listed by Appendix 1 of Ref (1) as possibly containing temperature lines asbestos. Vendors and merchandise designations are given to describe materials and may not include all acceptable products. Substitutions by suppliers are to be made only on approval ot the local authority initiating the use of this standard SUBCOMMITTEE NO 40 TMS DOCUMENT IS THE PROPERTY Of E I DU PONT DE NEMOURS AND COMPANY THE TECHNICAL NOTE - FORMATION HERBNIM.Y NOT BE USED NOR REPRODUCED WITHOUT THE PERMISSION Of DU PONT q c u o 2 <0 --x oOT DU 039504 \77 S4T pE This Page Rev Nov 1984 MEASUREMENT AND CONTROL OF ASBESTOS DUST EXPOSURE SAT Page 5 b. All determination* shall be made by the membrane 61ter method at 480 to 450\ (magnific-tii n) (4 mm objective) with phase contrast illumination. All fibers meeting th< proper aspect ratio (3 to 1 length-todiameter) will be counted and reported as asbestos. C. A qualified laboratory: b. All employees working in jobs which are "xposed to airborne asbestos fiber concentrations of 0.1 fibers per cm3, or greater, of air 8-hour 1 U A. C. Those who during their. Du Pont employ ment have previously worked in jobs with an exposure described in 8.1.1. E. I. du Pont de Nemours & Co Industrial Hygiene Section Haskell Laboratory CR&D Dept Newark. DE 19711 In addition to Haskell, other accredited laboratories are listed in the AIH.4 Journal. 7.5 Employee Notification. Employees should be notified of exposure monitoring results. Any employee exposed above the OSHA limits [Ref (8)] shall be notified, in writing, within 5 days of the finding and of corrective action being taken. Notification is required even if employee was wearing protective equipment at the time of exposure. 7.6 Exposure records shall be maintained at least 30 years. Other record keeping requirements will gener ally require records be kept for longer periods. d. Those with a known off-plant asbestos exposure prior to or during employment at Du Pont. At time of employment and periodically thereafter, care should be taken to record an; history of off-plant exposure to asbestos. . Those with an x-ray showing changes of the type which are known to result from asbestos exposure. 8.3 "Guidelines for Physicians" [see Ref (5)] contains additional information on interpretation and frequency of x-rays for asbestos-exposed employees. 9. CLOTHING AND CHANGE ROOMS 9.1 Special clothing, such as disposable coveralls, head covering, gloves, and foot covering, shall be required where exposures exceed the ceiling limit. Section 3. and during removal of asbestos insulation. 6ee 4.4. All employees should be alert for potential heat stress during work, based upon the special clothing selected and work area temperatures. 7.6.1 Employees and former employees shall have reasonable access to records which indicate the employ ee's own exposure to asbestos. 9.1.1 Contaminated clothing should he vacuumed or wiped with a wet rag before the clothing is removed The respirator should be removed last. 7.7 Affected employees or their representatives shall be given reasonable opportunity to observe monitoring and review the results. 9.2 Change rooms shall he provid-d for all employee working in jobs in which the expo-urc limit- in section 3 are exceeded. 6. MEDICAL SURVEILLANCE 8.1 Medical Examinations. Preplacement, annual, and termination medical examinations shall be made available to employees in an occupation exposed to asbestos (as defined in 8.1.1 a through e). These exam-* inations shall include, as a minimum, a PA chest x-ray, medical history, and pulmonary function tests. 8.1.1 Each plant shall assure that all employees in the following categories receive the medical exam inations prescribed in 8.1: 9.2.1 Separate clothing lockers or similar arrangements are required in those change rooms to pre vent contamination of street clothe- from work clothing. 9.3 Laundering of asbestos-contaminated clothes must be done to prevent the release of asbestos fibers into the air. 9.3.1 Those laundering contaminated clothing shall be informed of the need to prevent release of asbes tos fibers. 9.3.2 Contaminated clothing shall be transported in sealed impermeable containers labeled per section 12. a. All employees working in jobs that require handling of asbestos which might become airborne (such as carpenters working with Transite, insulators, pipe fitters, and millwrights). 9.4 When maintenance is performed on changehouse air exhaust systems (fans, ducts, filters), personnel should be alert to the presence of airborne asbestos fibers and take appropriate precautions. Portions printed In rad moot OSHA regulations. Section 1910.1001 (formerly .93s) tor all sections except 5.2 which is covered by Section 1910.134 aniline + DUP 0949107 DU 039505 DUP 0949108 DU 039506