Document e7dzwvVopjN74qL6ooNjrV5oq

y Inttr Office Communication >/ 'M S r \ [ 'u Qmaral Parte Division May 4, 1972 Plant Industrial Relations Managers Subject: OSHA Target Health Hazards The Department of Labor has identified five target health hazards that will receive priority in the inspection of industrial workplaces. These are: Asbestos Carbon Monoxide Cotton Dust Lead Silica '' Asbestos - A new standard is under consideration by OSHA that will be considerably more restrictive than the one adopted in February 1972. A copy of the current standard is attached. The provisions of 1910.93a (d)(3), (e), (f) and (g) have application within each of our plants where maintenance employes perform work on pipe Insulation containing asbestos. The proposed standard will incorporate periodic physical examinations to Bny employes exposed to asbestos hazard regard less of how limited that exposure might be. It is recommended that each plant * implement the requirements of the current standard Immediately and compile a list of employes exposed to asbestos for use by the Medical unit when the proposed standard is adopted. Carbon Monoxide - 0S11A is concerned with long term exposures to low levels of carbon monoxide. At the present time, the threshold limit value is SO parts per million for eight hours of exposure. Compliance officers consider an exposure to 500 ppm to be an imminent danger. A citation tor a serious violation would be issued if a level of 150 ppm were exceeded for one hour. Industrial Hygiene advises the minimum sampling procedure of an operation should be one sample per hour over the period of sn eight hour day. Each plant should have direct reading instrumentation for sampling carbon monoxide. Cotton Dust - The Industrial Hygieno Unit has given a preliminary interpretation that the srea of concern is confined to the processing of raw cotton. Dust from operations using processed cotton fabrics or threads would be considered exempt. Industrial Hygiene is seeking an official interpretation from the Detroit OSHA Office. j>0G7 1555 in' PRODUCED BY FORD SCF-FORD-0806 suoject: uenn target neauQ nazaras May 4, 1972 Lead - Lead-in-air hazards whether in the form of a dust or fumes from solder operations or other processes using lead alloys have a threshold limit value of 0.2 mg/M. This TLV is to be reduced to 0.15 mg/M^ later this year with the adoption of the new limits established by the American Conference of Govern mental Industrial Hygienists. While blood lead levels may be required on certain operations, low blood levels cannot be used as Justification for lead-ln-alr results above the established TLV. An Occupational Safety and Health Review Commission Judge has ruled that an employe cannot be used as a monitoring device. Silica - The threshold limit values for silica are listed on Table G-3 of the attachment. Again, these limits are based on eight hours of exposure. It Is recommended that you conduct a survey of your operations to determine those that may involve one of the five target hazards. Periodic surveys of the work environment should be conducted to assure that adequate control ventilation is present. Advise this office of those esses where a recent Industrial Hygiene survey report is not in file and we will coordinate the sampling of the current conditions. Attachment cc: J. B. Williams eddffi*-t' T. L. KOpke o o &n27 1f56 PRODUCED BY FORD n* * <0 31:6304 REFERENCE FILE y Tami O I Mwnn Dvra be used to meet the exposure limits pre comply with the requirements of these scribed In paragraph <a> of this section. subparagraphs relating to the operations Mgprf* Ucten Where such engineering methods are not Involved. The requirements of this para feasible, or do not otherwise reduce the graph are In addition to those prescribed auee: ____ concentrations below tho6c prescribed In In paragraph (b) of this section. paragraph <&) of this section, respira (2) All hand- or power-operated tools somtten* tory protective devices shall be provided which produce asbestos dust such as. but *110*44 turn Hotel dad)................ . and used In accordance with paragraph not limited to. saws, scorers, abrasive <c) of this section. wheels, and drills shall be provided with %6*0*+l <ei(i) (I) When the limits of ex local exhaust ventilation and dust col CrtototaMlr Um K the tilt calculated from Oil mini or nus tonuuUa ter TrUymlk VwXtbifiiM calculated (rom the ter* motet ter QUirU JUnorphoai. Indtttllflft Mtanl IfllntM (tea thin \% try*taJUne (Ulci). Htei .................................... IdAplUAC............................. TUe.................................... Portland cement................ . OnpMte (notunt).................. Coni dust (respirable (ration Urn thin l% 61Oi)................. . Tor non ibsn % BIO*............. lout or Naiiuct Dud posure to asbestos dust prescribed in lectors In accordance with the American paragraph <al of this section are ex National Standard Fundamentals Gov ceeded and when engineering controls erning the Design and Operation of local required by paragraph <b> of this section Exhaust Systems; ANSI Z9.2--1871. . 0 0 so SI 0 u Ktastel* SIOi 9 4(n|/M' 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 shaU re quire the use of respiratory protective de vices. The selection of respiratory protective devices shall be limited to those specified in the remaining sub paragraphs of this paragraph (c). v <U) The employer shall require that each employee test his respiratory pro (3) Employees exposed to the spraying ] of asbestos or the demolition of pipes, j structures, or equipment covered or In- i sulatcd with asbestos shall be provided y 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 nr other containers. Khnt/M* %6lO,+9 tective device before each use In order (f> Asbestos waste and scrap shall be l to Insure a proper lit accoidlng to the i collected and disposed of In sealed bags 7 manufacturer's Instructions The em-1 or other containers. : JUeptrsMe (ration.............. Tola) dud............................. u Imftel* 10 Iftmj/M' Non Conversion factory-- mppcfxU l*mllllo panicle* per cubic niter particles pr c.c KUUod of poiUcIn per euble loot of ilr, based on Implnftr maples counted by light-field technics Tkii pereentofe of eryiulllne slllci In the formuli ti tb* amount determined from alr-bome samples, is* cipl tn those Instincts In wbkh otbir methods hate been ifaowo to bo applicable i As determined by the membrane Alter method at 4XpbiM contrast TDicnifleatton Both concentration and percent quirts ter the ipptW ployer shall further provide for effective training or supervision of employees in the testing of respiratory protective de vices for At before their use. -- <21 For an atmosphere containing not more than 26 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 slnglc-use Alter type respira tor, operating with negative pressure during the Inhalation phase of breathlnc, (g) All cleanup of asbestos dust shall ' be performed by vacuum cleaners. No i dry sweeping or blowing of dust shall be / pei formed. ' S 1910.94 Ventilation. (a) Abrasive Wasting--(1> Defini tions applicable to this paragraph--(I) Abrasive. -A solid substance used In an abrasive blasting operation totlon of this Umll or* to bo determined from the fratioQ approved by the US. Bureau of Mines (11) Abrasive-blasting respirator, a piastal tlSMelfCtor with the lollowlni characteristics under the provisions of 30 CFR Part 14 continuous flow alr-llne respirator con (Bureau of Mines Schedule 21B>, or a structed so that it will cover the wearer's . Aerodynamic diverter (anil density sphere) Percent paesinc tectoe 1 00 SI 71 41 00 10 Oft 10 0 Tbe meieurimenU under this mi* refer to the use ( in A EC Instrument If the mpiribk friction of coal dust Is determined with i M HE the figure corrrspoiKJinc lo (hit of 2 4 in the table for coil dust U 44 Mf/ftlj 136 FR 23207 effective Decniebet 7, 1971| valveless respirator providing equivalent protection, shall be used. ' (3) For an atmosphere containing not more than 250 Abcrs per mlllllter greater than 6 microns In length over an 8-hour average, or more than 500 fibers per mUUUter over any period of IS minutes, a powered filter positive pressure res pirator approved by the US. Bureau of Mines under the provisions of 30 CFR Part 14 (Bureau of Mines Schedule 21B> shall be used. (41 For an atmosphere containing more than 250 fibers per milliliter head, neck, and shoulders to protect him * from rebounding abrasive. dll) Blast cleaning barrel. A complete enclosure which rotates on an axis, or which has an Internal moving tread to tumble the parts. In order to expose vari ous surfaces of the parts of the action of an automatic blast spray. (tv) Blast cleaning room. A complete enclosure In which blasting operations are performed and where the operator works Inside of the room to operate the blasting nozzle and direct the flow of the greater than 5 microns In length over abrasive material. on 8-hour average a typo C positive pres (v) Blasting cabinet. An enclosure sure supplled-alr respirator approved by where the operator stands outside and | 1910.93a Asheetos dual. (a) The 8-hour time-welehted aver age airborne concentration of asbestos dust to which employees are exposed shall not exceed 5 fibers per milliliter greater than 6 microns In length, as de termined by the mombrance Alter method at 400-450x magnification (4 millimeter objective) phase contrast illumination. Concentrations above 5 the VS Bureau of Mines under the pro operates the blasting nozzle through an visions Of 30 CFR Part 12 (Bureau of opening or openings In the enclosure Mines Schedule 10B1 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 288.2--19G9. ^v (0) The respirators provided each emA (vi> Cleon air. Atr of such purity that It will not cause harm or discomfort lo nn Individual It It Is Inhaled for extended periods of time. (vil) Dust collector. A device or com bination of devices for separating Oust ployee shall be properly cleaned, repaired and stored. Inspected^ ' from the air handled ventilation system. by an exhaust fiber* per milliliter but. not to exceed 10 fibers per milliliter, may be permitted up to a total of 15 minutes In an hour for up to 8 hours In an 8-hour day. (di <1> When n employer has em ployees who arc exposed to asbestos dust exceeding the limits prescribed In para graph (a) of this section and the ex (viii) exhaust ventilation system. A system for removing contaminated air from a space, comprising two or more of the following elements (a) enclosure (b) Engineering methods, such as but not limited to. enclosure, vacuum sweep ing, and local exhaust ventilation, shall posure results from the operations de scribed in the remaining subparagraphs of this paragraph (d), the employer shall or hood, (b) duct work, (c) dust collect ing equipment, (d) exhauster, end. (e> discharge stack. 3007 1557 Octupotlonol Sol**y A Hinllh Reporter PRODUCED BY FORD