Document 1QakgZ9NXb4Yz3k2bo2gJ1Rym

PLAINTIFF'S EXHTOTT OTrCMS'CORVTITC iBEiRGlAS IN72A-COMPANY CORRESPONDENCE To Mr. D- M. Barthold - Toledo frw* Mr. D. W. ' Ladd, Jr. - New Ter1c KATLO EXPANSION Dear Ibvs* ou October 9, 1967 J. N. Beveridge - New Tork L. Z. Sadosky - New lark / B. E. Boyd - Toledo 0. 7. Fletcher * Toledo R. S. Grant - Toledo Wayne Johnson - New Tork H. E. Roche - New Tork T. H. Theiraa - Toledo- W. W. Boeschenstein - Toledo t') Kith respect to your mamorandua of October 3rd to Len Sadoaky an subject matter. I there is one other consideration which is of paramount importance to this whale subject. As yoa ire well aware, the Government will probably blow the whistle relative to the use of asbestos in the not too distant futon and, before we enbaxk upon a substantial expansion prograa at Berlin and/ or consider potting a new facility in tbs Southwest, ve bad bettor be damn 3ura that we have an answer to the asbestos threat. Work has been dons an this in the past and, to date, than has been no successful answer. .. By copy of tMj naroorandan to Jack Thoms, X an asking that he give us ~pnr1ffr irrTilifflm nnti dlmrtlnn nn the irr eWll+y iH iru-Hwg _to Qirlnyr the asbeetos Tffbbleiu It nay be that, if' tfcen Is BO answer to tho" asbestos situation, ve should promptly enbark upon an aggressive process prograa to find a way to manufacture a Hhlti-Temp type product at acceptable gross narglns. / / As soon as you and X hear bade from Jack ihonaa, ve should plan to gettogether and discuss this natter further- Best ngards, (2jJ>cJUS HJL/eJa D. W. Ladd, Jr. si 01 025 0132 ~S) L'T" :>jcr ?Lf.r Ovjass-Illir.ois C-i:.ss Ccr_pro;. SnTcvillc. Jersey lay 23, JC01 I.. r.: =y Th; Saranac Laboratory Saranac Laho, Sen Terh Submitted Arthur J. Vorvald, Il.D. Director, Tho Trudeau Foundation and The Saranac Laboratory In cooperation 7.1 th: L'dword C. J. I r oar Thoses 11. Durian Donald A. Bailey Kepcrt of I'u.-lo division rl: of cl:c :.c.ylr ; c." . . . t. J J! m jl? ni} yjn3 m- i?iii amill t: . .u.-l . 2i fi_ ruuuu rut:;.-, cru.' o'-erie "rylrr j?- ?c ccvs:-. r;r:.c.*.;*.r 1 :.i : ere r.-Cs to do-rcrutirc. or.*. <:. c'.i l .cv. a: :z.i - rvr.; t: tl`c v.o:-;-.-crc e.:-r esc . w. l -- c"ic* c*i* 'ri.AVnic ?*. ***? ::r:r ir; vb.c cir-flovocd auirriil. cov. oV r :.;.:cr..:i.ly prcocrtc prior ruicu :: _o . ir. I c:-.- ruuii ns .01 nicrer.s ir. sioi. Cue .`.>.u : v..a z:-l:t-a on January SO. virile via oust survey --.us ether sire rare collected Ir.trr by Join: -:=zesr si1 s'.s Ccr.poay. Ilia roar motorialo else rsre crroulo. cc cctomirsti cpprosiastely. : t-Iliir.oi ccrenaitic. Corpse si tica of 1`ocarir is sard "i.uirl-sd ~ i r.rlust ?bc coonsoition end ij&ruiolc size of tho priorip:1 rev :.uT'.r:.ui: I;lch trr-: used In the nmufacwcre of -ho predust iij.yi. ci o indieuteC trble 1. In addition tc r^tcris.!** * s ci* ~ 42 OiS 0783 - Cro-zV.iV rind cement arc required but these tro iterr.a aro cat related to ry durt hazard. Cf tho Ei:: rr.T: materials described is table 1, ell except cuicl: lira bo regarded -us potentially hassrdous end capable of causing z. scrieua paouncconicsis. Inhalation of uaositc or chrysotilo can produce c. s', osteal a v.d inhalation of silica ficur cr Tripoli can cause eilicssis. linunraacecua earch on inhalation is capable cf producing a diffuse fibrosis which is unlike silicosis or asbostosis but which may bo quite disabling. The finding that the ssmplo of aresite had a quart2 content of 21 per coat ir. quite surprising. It is thus apparent that exposure to this com mercial fora of ar.osito say present a potential hazard cot only from asbestos fibers hut also from frse-silica particles. The ficished produst, Xaylo, appears to consist principally of a crystalline form of calciua r.ilicato c.hich yields a characteristic ::-rty diffraction pattern. Petrographic and chemical eaanination revealed, however, that other constituents oro present in the material. /. ser.pla of light grade Kaylo was shown by analysis to have a cuortz content of about S per cent; foV the heavy grade the Talue was about 5 per cent. Both grades also contained noderate cnounts of asbestos. In e sample of the light grade the asbostos was in the form of chrysotile which comprised approximately S to 20 per cent of tho sample. For a sarnie of the heavy grade the chrysotile content was ostinatad to be about 5 to 10 per cent but, in addition, abcut 3 to 5 per cent of araosite asbestos was seen. Carbonates mado up about 1 per cent of each grade of Koylo. 42 016 0784 ( Ccnssrtratica ri. 'Jc "oosj tics cf /tr.ccrr.iric fust . T.:o csneererstion o. she atrosph-ric dust to s.hicii the; '..'s.-isr.: c t:zsosed at various paints is el.rsn by the bust course in tabic 2, ruticu pertinent ts ths eparations cr conditions r.t each sc.v.rling ire i/.eluded in the table. A cuss:ary ef the duct ecu -tc is r.s id Surlier thssi ICu Lamer Router machine 4.4 million c.oc. Centos aisle 3.4 0. j 6 o Eatch weighing rcca B.4 A Asbestos unfcagging soon 5.9 0.26 0.1-1 5 cast finishing line 6.3 0.45 6 Frc-hardsner 2.2 o.cs 1`iror balcony 5.2 c.oo Tho cenpositicn of the cate riel suspended in the sir cs saves, re- rs-scatativo locations is revealed by the analyses in table 3; isos, tr.a cat:, in table 4 the v/oight of dust in the ataoaahere at t'noso ceres. locc.sisn; can be calculated. Thus, the dust load of the general plant air (sample t}ZA) wajs 0,2 graa in about 17,000 cu. ft. of air cr 0.01 mg. per cu. ft., while the dust load of the ctcosphere tt the other locations ranged iron 0.06 to 0.4 ag. per cu. ft. The hazardous fraction of the duct consisted of tho free silica components (quartz end diatosacoou3 earth) and the asbestos components (anosito and ehrysetile). These hazardous consti ( tuents generally made up a large porticn of each dust sample, as tho 3 42 016 0785 ! iVl=i| ij! hi I!ai til 11J I s! iifi J433i 9Ui .-?cllb'-:i.r.i; table r7s:ele: funeral reaching ore: /.eberic:; er.d: '-'.r.cr.'.l pir.-z air r..r.iE;'.ir.f i;.ac 1 out r r re e`i.inc 2';::car end true': A;bestc:i chr-Dcdiiij; rccn rrcc riiia C . . > w . W . . i ter ecu CC- 3j 1C-ZO IC-.vJ o*-3 S>*3 4*7 A?'-ior to; ccr.r :r-.: p:'i* cc"*: w" * '3 -52 ; fl? 10-23 I';- corral.-ting tha values for concortrati-T.: md c.c~c;:'j otaa etnarpheric dust at cash snarling paint, a fair id:;, of tdr aairn;;.:.;. dart hr.eard ax thane acints nan be obtained: fanplos 1 and 5A Routor nschiao 2 " SA Center aisle S " . 1A 3atch weighing roon 4 " 7A Asbestos unbagging rocc 5 AA Saot finishing line C " 3A Pre-hardener 7 " 2A Ifisrer balconyt asbestos tank - GA 3oxcar end truck Ataacphcric Concentration Particles per cu.ft, of sir 4.4 million 3.4 8.4 6.9 8.3 2.2 5.J rrce sirr.cu. ccm agents per cent crrv.or.yr.." par cc:.;v- 1-3 6-12 18-oC w <***"-'ai 40-55 22-24 C-5 V>wr\k>*r.w-\ - 5-5 15-30 10-20 .4,2 016 ..0.7S6 C-c- ( Cc--:-, ?hr> results of tho duot uurvay. which included the is: r~ ritc.-ir Ir. ar.d afcr.ocr.-'rcric duet rj-.d a id.:lied either of duaS cor: r.i'i'j it jpuersat that ccr.cidereblo attcnaica had teas give: slant t-s the ccr.trcl of oust. 3xhsu:t cvstcr.s ef roravieg tho OUST hesa inatalied end the aa-cotai of curt ctspcsacu ir. the pi: ns rjv--islsd by the curvcy to bo at relatively lor levels, ortr. ir. cany areas of tbs el cut uar.arcous free silica aad r.ir.craij cenpriand a Irxr? portion cf tho air-florted rate: "7ary i.tpcmut that effective dust control ncacurcs be rai: *11 tires so that the cliesorinatier of 'or.safe nr.cvrts of d; ;=t arto atmosphere rill *oc prevented, A nunder of agencies hsv* surrrrtid threshold or ------ r.llcvratlo limits far tho concentration of dusts. in industrial a f..;a sphere. la 1545 the I-npsrsrsnh of Health for the Ststo of '.'err Jo rosy Lua'c:--.cd lie Saranac Laboratory that the Departsart followed t ''Sanitary Cod-.-r -.-.'..oh racorcends certain threshold Units for dust enposure. A saaav.hut similar code has recently been developed by tho Ar.cricca Cca.'sreaco of Governmental Industrial Hygienists. Threshold vaiuos established by those codes are as follcrsi (The threshold values ere given on the nort page) 42 016 0787 ~5- f\ra:-::.:.;;;: I'cy z:t, iZil ( tiauirun Allowable Concentration (?ariielas per cu.ft. of air) >svr Jersey ccd-? Ar.. Csr.f. Gov. r.csc .. Z * Z 'J J 3 5 million 5 nillisr r rec* Total dust i.uro them " " t`0.1 dG/> to VO,'c s'- to co;i S/" to <0;:: leas than 5,v 5 10 20 50 50 5 20 50 50 revit?; of tho survey cn.ua Ji.sulosas that in certain arano (such as uir. hate:-, weighing room) free si lien cenprisad a large pcrtj.cn of the cucu to --hieh the worhcrc ?.cro enocood; in other areas (asbestos tanl: and coxanr; a so echos '.tc.3 the principal ccupcuent of the air-sucoenaod natsrial; cud ir. suili other localities (c civicr ciclo acid a coasts 3 uneagginj rose:} cv.ts tenuis.! ceouuts of beth free silica end asbestos waro presecs in the chr.osphoric dust. It ie thus apparent that although she dust counts of tho seven iupinger samples wore all below 10 cillicu, and therefore rela tively lew, the rather high quarts or asbestos content of tlia air-our.pmdsd caterial tended to create in certain areas a condition which night 'os hazardous, or at least one which approached tho maxima allowable Unit established by cods. Specific examples would be the exposure to free silica in the batch weighing room and to asbestos in the asbestos unhanging roon. Also, the concentration of asbestos dust inside the boxcars probably exceeded safe limits. Although a dust count ms not made during the survey 42 016 0785 -6- r--- .. r-w -- 1 ( for that sampling point, xho weight cf cusi collected there riih the vac-.rex cl&cxer caries end filter p:?cr indicntac thet the dust cctc.catre.ti.ts in side the tc.-ccr v:as possibly of the erder of 3 million or r.nro. iiv.ee scout cv.e-ihird of ths dus; rat csbciict, it zr.ev.s likely that a pci;t'ci;i'i. haiardctt ccaditica existed. :. Ic is suggested that riair.ua: exhaust rcrdilation rotes v.iiich fill provide cffoccivo dust crllsctioa for each broach of the cur; control cystrvi 'or ?ate:T.imcs, ur.lesr this ha:: alrocdy hear dcr.r, nr.d that the auction of these branches '02 checked periodically. Static pressuro msssurensats can be used to na.asurc c.ir fior. 2. The cracust oyster, fer tha a abactor, unbagping roc.a afcouic bo recesigicd ao that tho auctiaa heads rill be iccatod close ta the peixie v<here the dust is produced to collect it before it ccntrclr.cucc tho general air. It eight be feasible to bump tha asbestos bars into a snail hopper end chute rather than on to an epoa platfcm. `Civs hepper could hare * rotary feuding device fer '.coving tho asbestos cu no Ci.a riffle tables.^ The tables should be partly enclosed by placcic hccia and ahould be exhausted. Ilousolcoepicg in the arer. should be impress:' by periodioally cleaning the room of the accumulated dust. 3. Housekeeping practices could be improved in a number of areas of the plant. At the router machine the dust should bo removed f:ron co.c rr.achino carriage regularly and a sufficient number of container-* vided-'for the proper disposal of tho traste materiel. Cn tho miner balcony caro should be taken to avoid cpilling dry du3t una tho t s 7 42 016 0789 O--cr r.i.', txy r.:-, it-- ( should, ba clccnod psriodicslly. -1. Sp-clai attention should be give:: to housekeeping in those r.racc vr-orc silica flour, tripoli. diatoaaceous earth and asbestos arc handled. It v.-it noted curiug the survey that togs cf those nnterinls -xre stored in large piles throughout the plant eras rhiore space was available. Soros cf tho bags wore erc.hcn and covered with dust. Duet arising fro.i this ccurco would tend to contaxinste tho ataaopherv of the entire 3. It i;; reoerreoncisd tint a ruction hood bo installed in frcr.t of thv oporator v.ho annually turns over the Haylo tilao cn tho conveyor belt. 6. All employees meriting at points There dust is created should ba educated in good dust suppression practices. As an added safeguard. i1 it is suggested that those who work at dusty jobs be roquired to chanrn tkoir work clothing frequently. 7. Siaco it appears that no:: loading ben care are probably erxooed to a hnoardous concentration cf air-suspended asbestos fibers, it is ruooxuo.'idcd that the non wear U.S, Bureau of Itines approved respirators during that operation. It would ba preferable, of course, to reduce the dust concentration by exhaust veiroilaticn or soae other practicable xathod if at all possible. 8. Dust oount surveys should be made in the plant at regular coathly intervals until a law level of ductinesa in each potentielly-hasardous :r?r. is established. The survoys can then bo done less frequently. 8 42 016 0790 Ur 9. Tsc nointcnaaoe of tho scrltiag tL7irca.tant in a condition vliico conforms to rcgolomiens pro.'.uluatod by lceel health agencies cr chic! is in aucori 7.1th aasapt-.c standard s of pood practice should rot to era;idcrod as a ec.-plsse projection for a "ori-cr ire;.; ccquiiu.r.e a disease sa the result of hi5 oecupa tier.. It ir serongly recomendcd that at tho Cc.ylo plant r. ssdicei p rograr bo maintained which vroaid require a pro-er.pioyuent or mimetic;a. including a roentgenogram of tho chest, of all proipocriro employees end a routine chest rc.-rtgras-gran cf all regular --orirers at intcrral3 of onr.o each year. Cush a r.rorran should rovsal the so indiTd.dur.lr who ere unfit fer employment :a a dusty trade. Cf nest importance, any caoo of disenoo which right develop ir. the regularly employed workers T.euld fee found early, bofore it became a seriov.r. hanith prob lor: to tho indr.^idual mu .r. liability to the management. ^ 016 0791 l'ubio i c- - - ; - .. ( AfALTSIS OF RA" t/ATIT. I/iLS USZI> ~V. ? vr.::j?kczz?.2 cf faylo Fatcrial Anseise Composition Size cf Particles The bull: of the nr.ssi-ic* T.es fibrous. Liny cf the fibers VTcro separated; they did not possess the high degree of fier.iciiity of chrysoiile, Grains cf chlo rite cr serpentine vr: ro ad hering to sc;:s of the fibers. The sor.pla of the cr*osite brought back free the F-aylo ::Jsat hid e everts esntcr.t cf ?1 per cost. Fast cf the fibers r;cre savai**.! hundred ricrcas te several c.u. is. lenRuh; relatively far '.-are shsrzrr than 50 micrczc, Lory of these jl.sr ; fibers were 1 cicrcn cr less in die netor arc, unlike chryrouiic. rare generally straight or only slight;;/ curved. About 6 per cent of the material (by might) would peso ikrsu a ICO icech screen; in this sralli.ihen-lOC' cesh fraction about enc-vki.of the fibers rare longer than cl microns end fer every fiber there :.rr about 6 particles. Chrysctiic i!or= then 0 err cent fibrous clurysstil?, Adher ing to acne cf the fibers v-ere grains cf chromite {?}, carbonates. a fcs grains of mssire serpentine rad a lrr.ee cf cliriee. About 0.5'j q-.i3.rtz also "as present. The fibers ttci-c veil separated, i'ary wore several hundred rr.cress long and save t.crc several- ires. in length. About 10 per cent of ths notarial (by might) veuid pass through a ICO isssii screen; in the steal ler-than-lCO mesh fraction a:cue eno-fearth of the individual fibers were ienger then 23 microns sad icr aver;' fiber vac re -..ore about .12 ear:: clor. :t vhar- fraction mesinsi bundles nsre about as numerous as t-_: scurr-atcd fibers. Distoeacccu: COi'tk Principally natural aiatonacecus earth with u trace of quarts. Probably sons clays, ware preseat. Diatcms rare the fresh rater variety it). Probably acre than 50 te ?o per cent of the particles wore smaller than 1 micron. Quick lime Eeorly all line, with 0t2/i quarts end tracos of carbon* atos, feldspar end glass. Costly smaller than 2 microns era rarely larger than 10 microns. L'ary clusps larger than 30 microns rsrc seen. Silica flour Almost entirely pure, finely-ground quartz. Probably more than 95 per cent cl the particlos T/era scalier timn-5 microns. Tripoli Almost entiroly crypto crystalline quartz. Probably mcro than 95 per cent ef the particles rere- sculler than l nicroaa; only raroly rere any lengcr than 40 microns seen. 42 016 0792 '.'able 2 C-. ccb'CEr.iL'A'io:: cf ArvospEZurc lust a? various s.u^Liirs points All r.z'-plcs were tskan nith uks midget inpirger. T.-.c collecting fluid ~n- . SS. ccr/l alcohol. S-`: :r ~r.c>.ine. Taks:-. at "if- ?,!?.; 10 r.ir.. sr.imlin:. t:.r.n. r.::uc'..- r. :.-h_ce curcing E.v'lo blacks into pipe iaruintica fr.ms. Zr -- risressrted e:r>ocure of two cn ct router rrehire outlet removing !:; fornc ard applying cloth coatings, i. light j.lua --s c;r:.:;od c-_ s.:a fr --1 :h c&npror.ccd air c.i-rr.y guns to nn'ra too cloth c.chtrc to tl-.a "cyi:. I'i . parts cf thr machine wsro cacloted by sheet total housings thisa r: re enhuuseed by c central cuetin cystos. She c::.aust points rsr: cV.sc':: a by cooks tests and vcrc feusvi to hove ctrcrg euctisn. This zl~z ccutrsl erhaust oyster: also ccrved its v.-cst finishing line, which was r.ct im cocroT-.cr a'w foe tle.o, Sinac the erhsust peirtr- of the vast lino vers closed of.? by c: zzzis* the velum of eEhr.s;t at tbo reutcr itocoiro vac substrata: U" increased,. Use router nit v.o.s lets tod in the open pleat area. I'scrretoly hr ivy Lzc^ulz.ic.iS of Ksylo duti ::vurcd ii.c uLclcrcorricyo of the nr-shino. 'fh: c; orators discerned brekss. V.i-css cf insulatios by throwing thss inis css-, c-.rtaioorr. Several ccntriaore v:-e filled in r, short tic.e end the sr.cns: G.' ::zoris fell to the fleer. Zovsekcec is.g in the rrcaiac area ns cri" fai; , lust concentration: particles per cu. ft. of air *1.1 rillieu ssallsr than iCu. {nearly ail cf a ::: particles appeared to bo Uu cr leas i:a l-sayth, C.OS c-illior. larger then 10,1. ;1C to 2C>- it. lisaale l2: Carter aisle. Lukes it tklD ?,Z. j 1C :.-lu. srrvlisg tino. General air sample along orator e.islc. batman diract-lirca criirs oiai rotor units, The unite mra of a cccpiately endorse construe ties, fni" a slight volume of steam ms noted escaping into the general air. laucoh.'ip.at ~as good. Cust concentration: particles per cu. ft, cf air l.i aillien snailer than lCp,. (Host of the ta:`*ii;.enre Su cr les3 in length.) . 0.1S million larger than lO^. (10 to 2Cpi in lar.rili. Sarple ^3: Batch weighing room. Taken at Si30 P.H.j 8 nin. sanpling time. Gonoral air samle in baton weighing room area. i?o weighing was being ::i: tr tine of sampling was does to the changing of shifts. Other ncrnil ac.i. ity ms going on, Eousekeeping in the ltc& T7-s in fair to goon order red cat general ventilation conditions vrsro good. Th-j dumping points of the dust storage bins into the neighing containers mere each provided rrith e.-daiust eye- tens,- These oxhaust points v/ero checked by ssnke touts and the suction u-: found-to be only fair. During an inspection mde ctrlior in tho day visib'c amounts of dust were seen tr esiape into the general room air fren the d-ais - irg points during weighing. Duct conccr.tration: particles per cu, ft. of air 8,d Eilliea snailer than 10n. (Kest of ths partis .i trere fii or lees in length.) 0,36 million larger than 10ii. ( wmi Tabic 2 (Ccnviaucd) c---:r; '1y c: , . .. C;-;>lo i!<:. Ks'josxzz ur.bar :.-= - i;:~. Taken e 4:00 P.'J.; e rein. s.-rpliug eirc. Eaporurc c: -z-ri:: t.is-'jstos uabr.pgin" roan. A coaplcis cycle cf yc. i T2S dor.a iralvb-i.'g c-.:nlr.g c: 200 lb. bey cf nmasita lcns-fibcr asbestos, itr:?*.-..: it c:; c. piuii'cfeeding the rilh'lo table tr.d feeding asic.raoo La:: in '.a-.is: rill. The roe:: arc ccn.jlctcly ccclosei sad uus e-ihauaeob iYorr r.vc por.uir. iu tho coiling. The door --,*c cpsn to admit bags of asbestos s.:.d :.r. t?Ae air for ventilation. A visible dead cf cist in the tir v.-_ a prsoirv; h:ri-.g sac vn'iagging eprr.-.tior. L'o'i:nt>ly heavy acsunulstisos a0 liter '..rosm on vha ro.ch.iac avri'r.acs and .calls throughout tha rare:. Ora-:'" the '-ir.u.g operation the a.crr.v.ar. v.hz v.as statical'! in the stream :<1 n;.r ccriing -=to t:.a rocn, vors a iiiter-tyse rscoiratar aoorcTsd oy tha 0.0. I.i.-;_ nf lilacs. Cast ccnceatratior.: [.articles car su. ft. of air C-.2 ail lies scalier than 10;i. (Hast cf the parti cles wars |i or less in Iceylh.) C'.IC- r Him larger tan ICi. (Kcnr 10;. ir. lcn;-:i. , >i 2 ; J: hart riii:.s'*..ini=' lire, Token at 4: 15 P.r.; 5 rin. 3;::h::;, T::y.'uvc of Torlm.r:: erni)** 'birrin': i'r.ylo structural tiler by ivsi i cn a . .rarryir bolt licitcc in Ac ccr.tcr of too finishing line. All laaar.t tr.i; icccch..r" operations -.-ars tr.cicscd and cere provided rith enhausr:., for::-: ; ;c juaircivier. of dust ~rc raised T.hcr. iha ran turaed the tiles. The fir.:, shin-inc --is Iccr.tai in the setc plant arcs., icuscke-}~z~ res c.oad. fist coacar-trr.tiea: particles car cu. ft. of tir 6.3 aillioa smaller tha* 10ji. ( lest of she carcits itsre Sii or less in lan-nh.) 0.45 million lurgar than lCn. (foatiy 10 to lh ir. length; oas vas 1-ZZc. long.) Sac;la 5: Pra-hsrdcnrr. Tsh:r: at 4:-13 ?.",; 10 ran. simpling tiro. Pro-hardonor end tils pouring Eicliino, B unit. General tir :a.:.r)ic 0y area in Y.hich three lien operated the unit. A vet slurry of 1`aylo era poured Into nclca tr.d than passed through a stem chest iats tha pra-hLrdar.sr. A aoderato aaouat of saean c-cs in tha atmosphere trend the nachir.c. Dust conc^ntraticn.- particles per cu. ft. of air 2.2 million smaller than 10n. (Tost of the purciiclas ^?ore leas than ii i-c length.} 0.45 nillion largar then ICji. (Up to l;i ia Icar:... Gonclj ^7; Hirer balcony. Talxn at 4:55 P.ll.j 10 Bin. sampling tins. Central air sample in 'rest end and center cf the miring balcony. Irro nen irere.doing their noncal work. Os.a am added lias-, silica and cencnv to a. miner unit from several portable containers. All tha siror units T.aro covered. Accvnralaticns of bus's frox spillago cere present cn ail fro mixer units aid on parts cf tha floor area. Oust concentration: particles por cu. ft. of air 5.2 Billion smaller than 10^. (Host of the particles trere less thsn in lenyih.) 0.00 rillicn largar than 10u. 42 016 07J AlALYOIS C7 SAtrlYS 07 ltt5?ZZ?.lZ LOST r.---- -- , " ' fSV EL-.-bct*- 1A 2A si':- cert c:r c:. 5A per ce.:t per cent per sc;-.-; 2 5 3-3 3- : PA ; cent uer ... . - d Cilci-itc C CMCC 2-2 &-J.S ". *r 1>2C' ^ -.* s. i==| ijji jill j|;l ml Hi JmI I? S3i ai;ll! -' *** ` *iITn *3 ft , i-mp.-e ciT'-e.-.n:. : c;i:'ieemii-c c;.e :o:.v. ccs:-: ccr :... 5--* i Fibers ceid L-v.rc les of auosita up to ss-rsral c::.. 3:., iiuch of tbs fnr site fcstv.'oer 10 me ICO nicrces in lo:;.: *A. Tio sLiositc ccmrrcd mostly as 20 to ICC iiicrcn iibrr:; r. i bundles of mesits unro uotsc. ilio chryaotilo eras presen.: prrtielly ouenad bundl-ss several hundred 'lisreus icur. SA. The bulk of sample $a v.-as eu unidentified isotropic u.: eeri; vita. a Ion :'.r.dcr. of refraction. Possibly it :.t.r secrproes ca or a loss porous forn of Se.ylo. i'vcb of it cscurrsa rr. rosette-like rnssss. 6A. The bulk of tbs fibrous catcris.1 appeared to constsv Eostly 20 to 100 nicrois lenj sene mre ssTsral hundred lonj;. 7A. The erooito occurred as flexible fibers 2J to lie e . : i also as bundles several hundred rdcrc-us to several v Fibers shorter unm 20 ni crane ppoa:-'sd less floetlb 07tile. It is doubtful vhr; mush or try c:-..y:;-tlio ;... this nrylc. 42 Olo Tr.bla 4 DAT;-. FC3 S'.1!?LE3 OF AIVOSPEESIC DOS'.' .... " . . !'py 1-. 1 r :L S.-i.:; Ir r.v-.trr tfsic!*6 oi cruet crUcc'ccd Description of cru:.!^ c 1.0 Coli-occd in rcusral woi-liirr cm freu 10:-.0 <-.i\ 4:50 F.L'. (6.5 cru.) on Jtn. 31. iiol. i. 2.S Collcstud at asbectes trak fror. 10:15 -'-.I!-, tc 4:10 ~ (C.25 lua.) ca fib, i, 1551. o- 0.2 Ccrcrci elect cir scnele eollscucd frun C:25 i-.L`. tc 3:2C P.il. V.I iru-s.) oa Feb. 2, 1251. Ch 2.4 Collected ct fiaichins lino fron 1C:30 i.z, tc 4:30 ?..L1 (G hi-s.; cn Feb. 3, 1951. 5; 2,9 Collected r.t rcuter fror. 9:00 d.L\ to 2:C1 (6 hr:.. oa Feb. 6, 151." -- 5.4 Collected in bon car froa 8:50 A.i.i. to 12:0 [Z.i oa 7cb, 12, 1S51 end while lotdins trv.ci: free: 1:CC id 3:00 F.IT, (2 lira,) on Feb. 15, 1551, ?i 1.1 Collected ia asbestos shredding; roca iron. 1:C0 1'v: 4:00 F.il. (3 hrs.; on Jen. 30, 1953.. ROTE: Tha sanples of atsospheric dust fcr analysis ware collocted on a paper filter irith a vccuun cleaner. The to lime of air saspled wa3 about 2400 cu. ft. per hour. 42 016 0796