Document QXL9pkKoLLwL1ka7L7gNXo075

U. S. DEPARTOEmr OF LABOR OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION REGION X SEATTLE AREA OFFICE ROOMX808CSMITH TOWER 506 SECOND AVENUE SEATTLE. WASHINGTON 98104 January 22, 1973 .^CfKTjS/y. TOi EMPLOYERS USING ASBESTOS SUBJECT* Asbestos Hazard Control GENTLEMEN* The enclosed package of selected materials is oriented toward the employers' role in developing an asbestos control program. If you have specific comments, suggestions or questions regarding the asbestos standard, please write them on this sheet and return to the course instructor, or by. mail at the aboye address. Sincerely, /\ 1 ' /.. . /-'-X'' ' R. L. Beeston \ Sc SGP 0006582 EMPLOYER'S ASBESTOS CONTROL PROGRAM CHECK-LIST The broad requirements of any asbestos control program should include : First: Initiate a respirator program immediately to reduce exposures until other contol measures can be developed. Second: Identify obvious dusty operations,or potential sources of asbestos dust. Third: Develop capabilities for both personnel and environmental monitoring. Otherwise the exact exposures or dust level ranges are unknown. Fourth: Examine work practices to identify those causing dust production and eliminate,modify,or explore alternate ways. Fifth: Initiate engineering controls that will have a sustained effect? such as, substitution of materials, new methods, ventilation control,iso lation, enclosure and dust collection. Sixth: An educational program is necessary to explain program directives, changes of work practices, techniques,and medical requirements. Seventh: Medical programs are now required. Each asbestos worker must be medically and environmentally monitored. Record keeping and availability of the records to both the worker,his physician and to 05HA or NIOSH are embodied in the requirement. SGP 0006583 ASBESTOH HAZARD CONTROL - GENERAL CHANGING \!0JK PRACTICES IS A S1'MPLK, ECONOMICAL, AND PRACTICAL APPROACH *1X5 CONTROL OH ASBESTOS DUST PRODUCTION Gome recommended practices are : 1. Use plastic waste bags Tor collection,transportation,and waste disposal of asbestos refuse. 2. Use a portable industrial vacuum cleaner for pick-up of asbestos waste and dust at the work site. 3 Use plastic impregnated paper coveralls and dust respirators for dusty operations of an incidental nature* The coveralls are throw-away and eliminate processing and cleaning. . L. Use down-draft ventilated portable work tables for precutting and assembly at asbestos materials at remote locations,mobile situations or inside ships. 5. Precut all block insulation in shops under ventilated condition and then deliver it to location. '1 ' ` . ,>f C. Package pre-cut block insulation in plastic and add water tocontain dust, maintain integrity of gores,identification,and ease of handling. 7. Reduce airborne asbestos dust 50 to *0 % by prewetting the materials before handling. P. Mix asbestos cement (15$) at remote locations under ventilated conditions. Mix small batches in plastic bags. 9. Spread plastic or canvas drop cloths at work site to contain and facilitate clean-up. 10. Conduct modular assembly of asbestos materials on piping prior to installation. SGP 0006584 11. Consider disposable forms of respiratory protection for onetime or intermittent use situations. (U.S. Bureau of mines Approved.) 12. Substitute non-asbestos products whenever suitable,acceptable and feasible. 13. Use e ^closures to limit the spread of dust from unit operations. 14. Seper te clean-up areas for workmen. 15. Limit exposure of other trades in the vicinity of asbestos work. 1A. Develop asbestos work stations,, either portable or stationary , to control dust production. # 17. Develop suitable storage and storing areas. Some practices that produce high asbestos dust,,leyels s and SHOULD be prohibited 1. Do not 3lean up fallen asbestos debris with brooms or brushes. 1 2. Do not allow debris to be thrown from staging or from one deck to another. 3. Do not shake coveralls or drop cloths. 4. Do not remove respirators before asbestos dust laden clothing. 5. Do not clean dusty clothes with an air gun. 4. Do not vent asbestos dust picked up by ventilation into adjoining work areas,or ships compartments. 7. Do npt wear respirators covered with asbestos dust. 8. Do not wear street clothes to handle asbestos materials or under known dusty conditions. 9. Do not use asbestos for welders pads. 10. Do not allow uncontrolled cutting,ripping,sawing,or bracking of asbestos in small enclosed spaces. SGP 0006585 TYPICAL OSHA SAMPLING DATA SHEET Substance: Asbestos 4 Standard;2 CFR Ia10.3a(b).(l) and(3) of June 7.1972 8-hour tine-weighted average:5 fibers,longer than 5 micrometers,per cubic centimeter of air. > Ceiling concentration;10 fibers,longer than 5 micrometers,per cubic centimeter of air. Analytical Method: Fibers court id at 400-A50 Magnification,using phase contrast ilium, nation, with sample mounted in high-viscosity solution of membrane filter material. Sampling Equipment: Personal sampling pump plus Millipore type AA Filter (37mm,0.8u pore size). Face cap is removed and filter used open face during sampling. Sample rate: 2 liters per minute. Sample Size: Minimum period of 15 minutes for evaluation of ceiling limit. Several samples of up to k hours for evaluation of 8-hour average. Samples with a visible deposit may be too heary to count. Compare with a clean filter. Heavy concentrations of visible dust in the air (100-500 fibers/cc) may require short sampling periods ofonly 5 minutes,or less. Blanks: With each batch of samples submit two filters which are subjected to exactly the same handling as for the samples except that no air is drawn through them. Lqbel these as blanks. Shipping: The cassettes in which the samples are collected should be shipped in a suitable container,designated to prevent damage in transit. Formula used for Limits: E= Vi CT+.... C T 22 nn F=equivalent exposure for the 8-hour workshift. C][=fiber concentration for the period T^ T^^time in hours at '^ncentration C^ n~= a series of nurmbered samples and exposure times. SGP 0006586 FATE OF INHALED ASBESTOS FIBER Breathing ?one Anr Containing Asbestos Fibers Total Range : .01 up to 100 microns, Inhalation 75 $ Retained in 2 to 10 micron Range Lungs Pharyngeal Tract 25 % ] ietained 50 % Retained 12 Hours After V/ . Lungs 12.5 % Few Hours After ------------------------------: Gastro-Intestinal Tract 12.5 % Retained Range : .5 to 5/1 A2.5 % Accumulated 120 Days After Few Hours After Lungs Castro-Intestinal Tract 99% plus of Re?rnining fibers dissolved, remaining fib- iAfter several months nearly all cleared or macrophaged in tissu^ ers CLEARED of the fibers will be excreted Range : .5 to 3 Long Term Effects Promote ASBF.STOSIS And Probability Of Cancer Long Term Effects Promote Probability Of G.I. Cancer SGP 0006587 PREDICTED ASBESTOS DUST CONCENTRATIONS (Taken From Actual Measurements Of Industrial Operations ) T'Te of York Present 1. Mixing & Applying ''enoit and Cl oth to Insulation Material Good Ventilation 25 Poor Ventilation 4*6 Improved .5 1.0 Change of York Practice & AoDroved Respirator .05 .10 2. Cutting & Applying Insulation Block or Sections to Piping Good Ventilation "por Ventilation Cutting Materials ^cvror Later Use in Cut*ire Sheds 5.2 11.5 7. A 1.5 \JO\ \n .30 .50 .20 3.Spraying Turbines or like Machinery in partially enclosed Spaces Sprry Operator Hopper Fender *7 10 .7 .1 3.C 1,0 U. Asbestos Cloth ; Cutting 25-30 Fitting,glueing ^Installing 10 .5 5. Magnesia Block Cutting Ventilated Unventilated 10 IOC (. Anosite Cloth Cutting 5-15 5 20 5 1 5 1 7. Asbestos Cloth Cutting Ripping Cutting 50 10 2 2 1 1 II SGP 0006588 ?-roe of V.'ork .Present P. Amoslte Installation 10-45 or Ships(enclosed Spaces) ''agnesia Block Cutting v installation Ventilated I'nvent Hated 5 25 10.Asbestos Cement. Mixing Open inclosed Bag 100-200 3 Improved 10 Change of Work Practice & Approved Respirator 21 51 25 10 11 l". .'-'pray'ng Asbestos Materials(5Js) on New Puiiding 12.'T3xing ^Charging at Hooper 4S-1C0 / 1.0-40 50 10 13.Incidental Exposurefron Spraying IJozzle Feet away 14.'letting Down of nip-out materials 40-40 75-100 50-70 . . -30. 20 15.Pip out of Materials-rUy 1/'..Bra^e Shoe Repair Shop 200+ 25 1?. Coveralls Covered with Asbestos Dust 5 (intermittent) 100+ 10 1 10 5 5 5 50 2 >1 > SGP 0006589