Document aBRRkp7B7exyRwNNXDGer1q2e

! ' ! VK Inter Ottiea , , 5 - ' , ?! \ \ , ! J Mr. iLeroy'Jaggers, Section Supervisor Reliability Laboratory, Building ^ Personnel and Organisation Start - 29*April 1983 ce ` R.Albertson; : G. Bejaa J. Brovaga,,,,, S.Pant, M.D 'M Subject : Industrial Hygiene Survey Asbestos] Exposure s at Brake,, and' < Tire ` Laboratory:']< ff, j \ " !r! * , i Is' * " ` ;1 Ai' wqua'ated, ad industrial,hyg^xu^:studyy-uaa:;'Casducted;:(at''the; Brake''and Tire 1 <, y,;> 'LaboratoryBesearcb> and Engineering, Building.:; The 'purpose: of the"study ' \ : r l-taa to da,tet the presence and' to deterninsiquaatities .of airborae 'asbestos M! 1 . ^fibers generated durin^,ytnka/>MU. sd':perforBBUicej;jteisting.:::':'EBployee::>concerns ./ ;- :^'.-:''y^ :about:'working.wi^;asbestos>ladeh'uterialsy^oopted'the1 study. Several^1 : 's y! y :ybreathing''zona,areai <and;,bt^''.saBples:wr%ycollected':over::a>,tyo<-donth'>period 1V. :^T,y^jifila?rik^atts'nti :toydoeua6ntybbnditionsy;b^ryt?'Tarietyfof:;dyhaaoheter operations i f ><' '^f'pr^cedureis./;' rV'{is K. ,;y, t;if yf; J** , ' i `: ";;,`y:: ;yKLaboratory^ |tirake" 'testdngj-;troi^^ technicians who operate i ; t*':! ;:-:eitber,ya:ytwo-etage our-stage'^brake; dynaooneter.' Operations; can be Vcontinuous, > ;v y?f 1:;yhut':;bo recently jS^ydulingl^sIbMnrfia^qttni^fi'^utine'/operation's":'last'/several days and fundamentally include -`"' fir , i uu l,h ' ` f ? *' ' ' '; . , . . Oyhahoneter set-up, including then&ocouple, placeoent ; and; sone brake sanding > . j' 1' ;/''/ '[! frequent ' braka:;yinspectiqns^ -i; l ^fv^fI[.yv*:: ?>' '''it','' <4 `;'ti; i > - ' ' : ; . /iRunning aiaulations (includihg fade.axid recoTeiy) t v \ ' ' i ^ *: ; y , , i: . .y ah yy^y ; ` " :: ' Both dynaaooeter test cellsyare yentilated tc ngulate bnke temperatures as well . y as to control duat generation. The tyo-stage<taiitjis noreieffectively enclosed > 'ty'' ; than the four-rtage unitL In 'the past/ set>\9, inspections, and clean-up involved Yyy-yy, ooqprasaed air blow-off. This practice; Bust beSdiscontinued and is in the. process of being eliminated with the purchaw of an asbestos-approved vacuum cleaner. ' l-'t,y`,i ;l' -V,.-k::: ? '>'^^''0%^:': ,rs .. ' . -,y.' ' `' :;'r;y :> * ' >r^i( ( , `. \ `i tjlx* ly 'in >\ '5 . > { ' {. > ' y, As specified in 29 CTE 1910.1001, aembnne-fliter phase-contrast microscopy is , (` the teofanique advised for eo^dience puriwaes. Basically,,this as;thbd,involves ^ 1 fiber counting of any fiber greater than five microns visible at 450 I ^, ' 4' - magnification under' 'pha at^-yiw*" 1 . Two dravbaeks are apparent, ? - > vth this aathod: t ^ v! ' >, ' . , , ' s .f ' : 1. It lacks specificity for exact fiiar id^ntificatian in that any fiber:such , as glaas fiber, cellulose, etc. can be cbuntad if it fits the length (>5 nicrahs) or aspect ratio (3il) criteria (length to width). . . ' , , - ',, >>/ rjvyyy;. y ^ y-!,y<!, ,y / * . Ji 2. It ,does not account for the prasenee of shoft fibers (<3 nicrons) that nay be toxicologically significant based on eurrent sciantifie information. , i. !' > - M ` SCF-FORD-3310 . , ' V,*1 Mr.: Leroy Jaggera '' , -- 2 --! 1 _ ' ' ' i 29 April 196] ' i Therefore, to supplement fiber counting deficiencies, further analysis; was performed an various bulk! samples collected. , Either X-ray diffraction or polarized ligbt microacopf vas uaed to identify specific fibers et a 1% detection level. ,si, , ^} - \ , Re suits ' , 1 '' 1' , Fiber counting results are;presented in Table I, and bulk sample identifications are presented in Table IX.! These results, along with survey observations, indicate that: ', 1 , In aoat breathing zone samples collected tbs average airborne fiber concen trations >ero below tbs permissible closure limits sad below tbe medical action limit. ^ , 'V , The average airborne fiber concentration collected for R. Brandon on 2/8/83 was above the medical action limit. However,' upon further analysis, it-was difficult to distinguish between fibers of asbestos or, cellulose with polarized light nieroscopy. On subsequent samples tbe average airborne concentration for. this employee 'was;.below,-the medical action limit.' ' - ' (r 1 , * (* 1 -yi *, t* , , ^ 1 i1 |; , < 1 s ^ , , , 1 , ` , The average airborne fiber eoneentrations collected at various areas,,were , essentially at background levels. , 1 j i;'< ,'< , 1 ' 1 ,',*i`n-' . " ' '" The presence of the ehrysotile form of asbestos was found in an example of a typical brake shoe tested at the Brake and Tire Laboratory. < i* i, ` ; " f* I' , i11'i`,V* Mr*1'; , '*'?' , Residual dust. samples collected from the two-stage1 dynamometer indicated non-deteeted levels of asbestos at a 15 detection limit. This does not preelude asbestos from being present at a lower percentage ppm level. - ` Pipe insulation situated above the Brake sad Tire laboratory contains asbestos. , ' '' ' RECOMHETOATIOHS. l' Cbxysotile asbestos is a major constituent of brake lining, materials. Biological effects from exposure to this fiber have been well established. Complications are inherent since degradation of thie asbestos can occur' from thermal stress . to a recrystalixed form, fosterite, whose toxicology is still unclear but, may be related potentially to eilica. In addition, thie thermal change may not be cosplete, and,ehrysotile fibers ,emn still be present in the residual dustaaa free fibers. Therefore,'the following recomsendatione are relevant: 1. Prohibit the use of compressed;airblow-off,at any time. In,its place , substitute vecuas cleaning withCoapeny-approved vacuum eleansrs (99*75 ' efficient at 0.3 mierena).^ . '1 ` ' ,' 2. Vacuum cleaner bags most have warning labels that are readily visible. 3. Asbestos waste moat be disposed in accordance with OSHA 29, CF& 1910.1001(H) and other prevailing EPA regulations. ,, 4. Msdical eurveillence is required for:&. Brandon. 1 5. Respiratory protection training is needed in thie .area., la addition, protection is adriaed during inspection, sanding, or drilling. . > Mr- Leroy Jaggera 3 - ' 29 April 198* 6. Consider a H"iring cessation program for this area. It is well documented that aaoldLag can aggravate asbestosis and possibly increase tbe potential of developing pulmonary, pleural, peritoneal, gastrointestinal, or - laryngeal cancer. 1 , . * ' ' 1 . >" ' 7i Encapsulate or clean up pipe insulation that is falling on surfaces in tbe Brake, and Tire laboratory. 11 > ` 8. Continue employee training on tbe hazards of, asbestos and proper work 1 procedures to minimize exposures. , ' 9. Encourage good housekeeping practices and frequent band washings. 1 ' 1 ` * - ` ' * / t '' If \i ' * 1 10." Contact Station Source Environmental Control Office (SSECO) for documenting ` quantities of asbestos fibers,being'exhausted into outside environment. '< 1 1 7/' > .17 1 i7.'A7'"7r I \' 1 Pleaee respond to Hr. B.Vabeke, Supervisory Industrial Hygiene Services, Boom 104, Central Laboratory, with your, plans to be taken or actions already ' performed+on these recommendations.1I; ' >f - > -,.- , jb: ' -r ' Attachments A. E. Amberg, Ina)strial Hygienist '/1 Industrial Hygiene & Toxicology Department Employee Health Servioes ' i' , 1 '< /! ^ ^ iV'j-, ') ` ' *;, ;* i 9