Document 82EpX6jmLEXoqEyannMkx0e9a

wn!:j V iMTcnfiAt, ocnniapONDBNOti n, 08804 UNION CARBIOR CI9ESM1CAI-S COMPANY ihstttutb plant p. o. box 2831, charleston, wist Virginia U(n*m> Mr. 5. C. Giainbruno Cm#4r ivnHtm Industrial Relations 23 October 1963 OrigiMN*f o*pi. Medical Department - Plant 512 Cw * Mr. L. tl. Dickinson Mr. N. s. Eastman Mr. R. A. Huber Mr. B. r. King Hr. n. M. Best Dr. c. u. Demcld Mr. iukbi . Insulation Block Djst Survey Mr. Construction Insulation Shop Mr. Plant 511 Mr. Mi-. Mr. L. B. Weddell - Safety Dept. Enclosed is a very excellent and very complete Industrial Hygiene report on the potential hazardousness of "Thermobestos", "Kaylo" and "Carey-Temp" insulation blocks which have been processed in the Construction Department's Insulation Shop. The report points out definitely ttiat "Thermobestos" and "Carey-Temp" insulation blocks cannot be fabricated safely with existing equipment, but that "Kaylo" insulation blocks can be fabricated safely. Mr. Peele's recommendations are quite definite and I am sure that you will wish to comply with them. I believe this particular project should be considered completed. If there are any oonments, suggestions or criticism, please direct these to me. HJSrhl Enclosures lNIXJSl'KlAl. IlYtfUIL Construction Insulation Shop - Building Sll-2018 Report 63-IH-3-G-1 808805 SUMMARY : The Consti'uction Insulation Sliop (Building 2018), riant S12 location, routinely fabricates large quantities of insulation block with ventilated bard saws. Tliis noi'c efficient px-ocedure of fabrication lias replaced an older, time honored, practice of using simple handsaws to do the job. However, it has, at the sure time, created a health hazard resulting from exposure to excessive concentrations of atmospheric dust. The liazanJ to health has been evaluated and reported previously* with the result that one material, "ThermobeStos" was clearly identified with the hazard (exceeded TLV) and another material, "Kaylo", was safe to fabricate (within TLV). The present report (the third on this subject) was initiated in an attempt to supply answers to three basic questions: (1) was there any error in tlie original evaluation of "Kaylo", (2) can supplementary exhaust ventilation reduce the "Tlicrniobestos" hazard to within safe acceptable limits, arid (3) is a hazard to health produced in the fabrication of a third material, i.c., "CoreyTemp". The information uncovered in the present evaluation reveal s the following facts: 1. "Kaylo" insulation blocks c.m l>e safely fabricated with tlic existing equipment. 2. "Thermobestos" insulation blocks cannot be safely fabricated at . Lire present time with existing equipment, but could be safely fabricated if the exhaust ventilation is improved. 3. The TLV (Threshold Limit Value) for "Carey-Temp" is identical with that established for both "Kaylo" and "Tlicnnoboslos", i.c., 20 mppcf (million particles per cubic foot) of air. 4. "Carey-Temp" also cannot be safely fabricated with the existing equipment, but could be if improvements are made in the ventilation system. 5. The original "downdraft" exhaust ventilation rate:;, <>n oiiher hind saw, do not meet the recorrmended capture velocity l'atc of 4,000 fpm (feet per minute). G. Tlic supplementary "overhead" exhaust ventilation on loth hind saws, is an improvement and llic rates do meet the ivoimiunded ` capture velocity rate of 4,000 fpm. * I.II. Reports G2-1II-1-C-1 and 62-IH-2-G-1 808806 intro; :i 'lti'':: A report, submitted in ll*rch 1962, stated tLit an inhibit n iia/.aiTreilth was produced in the Construction Insulation Shop whenever "Tnoi:: i-jstos" insulation blocks w^re fabricated. In July 19G2, a 6econd survey was co nducted in order to evaluate tliree new "Thermobestos" materials which hoc ic:i applied hy the mmufacturer for evaluation. This survey revealed that, alt-hough the inhalation 1 wizard io health lad been substantially reduced from that a- 'antur' ! during the first survey, the atmospheric dust concentrations l.cing, emit 'inr-inj; f-'.l rication of there new products, were still in excess of the Thru i . )j -1 I. in it Values as designated in the first report. Therefore, all reconir.endaLion. ; shoe.: I remain exactly an mated in the initial report of March 1962. The manufacturer and Union Carbide's Purcliusing Department, expressed a great deal of concern about the findings revealed in tliis initial re.fort when it was uncovered Lint the manufacturer's Research Department also lull evaluated thaue materials an. 1 was not able to produce results comparable with ; 1 r.* contained in the report of Kirch 1962. That is to say, the atmospheric dust concentrations reported by tlie manufacturer, when processing ''Thermobestos" insulation blocks, wore substantially higher than those revealed in Report L2-1H-1-G-1. This revelation disclosed the need for a more extensive evil nation of this problem so as to resolve all differences of opinion relative to the atmospheric dust exposures in this environment. This decision in favor of further evaluation, proroUd the production of a much more extensive study than was originally planned, a study which eventually encompassed three separate intervals of dust sampling, analysis, and evalution before all of the unanswered health problems could be resolved. DISCUSSION: These Uiree investigations were actually initiated for the general p u.oses of Loth clarification and identification - purjosely for clarification of the actual hazard to lioalth (if any) connected with tlx: fabrication of three different insulation materiaLs and identification of acceptable measures for use in reducing all exposures to within safe acceptable limits. However, each investigation occurred for clearly identifiable reasons as explained below: The investigation of 24 Jan 63 was conducted because: 1. The Johns Kinville Company r.uliaitted a report, y -' I// tl, ir Research Department, which contained data th u. res: 1 t -:1 with tliat submitted by this department in Report r.;-lh-1-. 2. Tliis department desired to dwi !y the roar-nr. T : : discrepancy between the two r-qorts and to' V* at ilv ; it ivaiy, the actual conditions as tbr/ <':-:ist in lli: w >t ir.g ronim.-ig . The i lives Ligation of 25 and 26 !' ! lid win condii-d'--! 1 1. In the preceding invostigai.i .n, the two inrul * i: . is-rei i ils in question, i.e., "ThenroLe: to;" and "TayJo" w-i In red .`advertently during the cam" afternoon, a j re .-c:) ir which v.js not in keeping with an attempt to : j'imul ale ih - -nidi Lions ' tlx? original report. In the original rep), ` h mt. ri.il v evaluated on separate occasions no as t < ; lu-lu i the 1 'ssibility tliat any one sample might contain du x. ; iuocd hy Loth operations. 808807 2. The "Kaylo" insulation material liad to be re-evaluated. 3. The Construction Insulation Slop requested tliat a new insulation material, i.e., "Carey-Temp", be evaluated. The investigation of 6 Mar 1963 was conducted because 1. The Construction Insulation Slop recently liad installed supplementary exhaust ventilation on both band saws csvJ desired to know if this additional control method would reduce the "Thermobestos" dust concentrations to within safe acceptable limits. -- ------------ A comparison of the reasons listed above discloses tliat each was different .in content and concerned actually with different investigations but all were interrelated in part, i.e., each was concerned with the came environment, the same location and the same specific methods of fabrication. Consequently, the sampling procedures, utilized in each instance, basically were identical and in accordance with tlie following condensed explanation: First: Two methods of fabrication, i.e., cutting and edging, and cutting a radius, were evaluated at each band saw since this isstandard'practice followed rrrthc fabrication- of any insulation material. Second: The environmental conditions of both preceding, reports, i.e., 62-IH-l-G-l and 62-IH-2-G-1, were duplicated in that all outside.doors to the building were closed. Third: Each dust sample was collected in the operator's breathing .zone as he worked in the fabrication process. Fourth: The complete fabrication of "Carey-Temp" insulation blocks was evaluated in two ways: First, with all available ventilation in operation and second,with only the-original * downdraft ventilation in operation. Specialized campling procedures were utilized also during portions of the latter two investigations, in an endeavor to evaluate tlie .airpleT. -ntary exliaust ventilation system which had been installed as rcconiTrii.lct.'.. Tnose were as follows: Tirct: The complete fabrication of "ThonncLcr!<>::" innil-.ition blocks was evaluated in two w.iyn: First, with all -r/iilablo ventilation in operation and second,with only the original downdraft ventilation in operation. Second: The complete fabrication of "Carey-Tem;." irI ion bit .kr, was evaluated while utilizing all available exhaust ventilation. 808808 'i. It in necessary to explain that "Kaylo" insulation blocks were not included as a part of this evaluation since the initial investigation, (performed without supplementary exhaust ventilation) disclosed only one exposure exceeding tha TLV of 20 mppcf of air and, therefore, it could be assumed that any ventilation that might be added should be more than adequate in controlling the hazard. EVALUATIONS: A. Atmospheric dust exposures: 1. The concentrations of inhalable dust, present in the breathing zone when fabricating any one of the three types of insulation materials, were determined in accordance with the following procedure: a. Three locations and nine different conditions of exposure, as described on Page 9, were selected for evaluation. b. Atmospheric dust samples were collected through the use of the impingement* principle of air sampling. The midget impingcr apparatus (described on Page 5 ) served as the instrument of use. c. The concentration of dust collected in each sample was established through the use of standard light field microscopic counting techniques as described on Page &. 2. `The size of the particles of inhaled dust was determined, for both "Kaylo" and "'niermobestos", in the initial survey of 1962 in accordance with the procedure described on Page 5. Consequently, no effort was.expended to repeat the determination for any of the insulation materials since the sawing techniques as well as equipment, i.e., saw blades with three teeth to the inch operating at 2200 linear feet per minute, were identical on both occasions and, therefore, the size of the particles should not be expected to deviate to any great degree from the prior recorded values. 3. The composition of the dust, i.e., percentage crystalline free silica or percentage asbestos was determined for both "Kaylo" and "Thennobestos" in the initial survey of 1962. Consequently, no effort was expended to repeat this determination since the materials used on both occasions, were reported as being identical in composition. However, since the composition of "Carey-Temp" was not established at any earlier date it was deemed imperative that it be determined and reported at this time. This was accomplished as described on Page 5. B. Local exhaust ventilation controls: 1. The velocity of tlie air being exhausted tlirough the ventilation liood openings on both band saws (#1 and #2) was measured through tlio use of a Model 60 Anemotherm air meter. 2. Four variable conditions of interest were evaluated: a. The velocity of air through the downdraft hood on both saws with all other hoods on the system closed off. * This means to strike against, as (in this application) the striking or dashing of atmospheric dust particles against the bottom of a small impinger flask containing a specific volume of dust-free water as a collecting medium. 808809 b. The velocity of air tlirough the downdraft IkxxJ on both saws with all otlier hoods on the system open. c The velocity of air through the supplementary overhead hood on both saws with all other hoods on the system closed off. d. Die velocity of air through the supplementary overhead hood on both saws with all other hoods on the system open. PFjDCED'JKES: Doth sampling and analytical methods were as follows: SAILING: 1. All samples used in determining the actual concentrations in air were collected with a midget impinger apparatus, sampling 0.1 cubic feet of air per minute through impinger flasks containing 15 milliliters of double distilled dust-free water. 2. All samples used in obtaining particle size distribution data were collected on millipore filters connected to a small battery-operated pump. ANALYTICAL: 1. Each dust sample was evaluated through the use of a counting procedure referred to as the light field microscopic counting technique.* The particle sizing techniques were derived from two separate sources. First, the sample was prepared for sizing in accordance with a permanent mounting method.+ Second, the actual sizing was accomplished in accordance with the recommended technique depicting the use of a filar micrometer and a standard microscope while using both the 43X (high and dry) and the 97X (oil inmersion) objectives.* 3. The evaluation and free silica determination of "Carey-Temp" material was accomplished through the use of two methods. First, tlirough information supplied by Mr. E. D. Ermenc, Director of Research of tlie Philip Carey Manufacturing Company and second, through contracted analysis performed by Mr. Thomas M. Durkan, Chief Chemist for the Trudeau Foundation, Inc., Saranak Lake, N. Y. FAULTS: See Pages 8, 9, 10 and 11. * Drinker and Mulch: "Industrial IXist", 2nd Edition, pp. 152-153, McGraw-Hill Book Company, Inc. Mew York, 1954. Pautus, 11. J., Talvitie, N. A., Fraser, D. A., and Keenan, R. G.: "Use of Membrane Tilters in Air Sampling", A.I.II.A. Quarterly, Vol. 18, p. 269, September, 1957. t Drinker and Hatch: "Industrial IXist", 2nd Edition, pp. 166-179, McGraw-Hill Book Company, Inc., New York, 1954. 808810 fi. CONCLUSIONS: Relative to dust exposures from Graph HI 6 Tables on Pages 8 & 9: 1. "Thermobestos" insulation blocks should not be fabricated when using only the original downdraft exhaust ventilation. 2. "Kaylo" insulation blocks could be fabricated safely when using only tiie original downdraft exhaust ventilation if existing leaks, observed on the H1 band saw, are corrected. 3. "Kaylo" insulation blocks definitely may be safely fabricated when using the entire exhaust ventilation facilities now available, i.e., hoods above the blocks as well as below. From Graph H2 i Tables on Pages 869; 1. Methods of handling "Thermobestos" blocks (preparatory to sawing) and scraps (after sawing) contribute greatly to specific individual exposures as demonstrated by the following facts: a. The fabrication process, which always begins at the if2 band saw with___ the simple cutting of each 18" x 36" x 4" block into three smaller blocks about 18" x 12" x 4", is normally the least dusty of all the fabrication operations as revealed by the samples taken on 24 Jan 1963. b. However, on 6 Mar 1963, this operation was revealed as being one of the dustiest, regardless of the ventilation being used. c. There was only one major variable between the samples taken on the two dates, i.e., the method of handling the blocks preparatory to sawing. Consideration of the procedure used on these dates reveals: (1) tliat on 24 Jan 1963, the blocks were rolled up to the saw after having been removed from their shipping cartons and stacked on a "dolly" for easy individual removal and (2) on 6 Mar 1963, the blocks were not removed from their shipping cartons until needed by the worker. A large amount of dust is produced when blocks are removed individually from the cartons as a result of the natural abrasion produced when one block is pulled over the surface of the other. Consequently, the dust concentrations on this date at this location were greater than normal. 2. The supplementary overhead ventilation (added since the time of the preceding two reports) does successfully reduce the dust exposures. However, it does not reduce "Thermobestos" dust exposures to within safe acceptable limits when cutting radii. From Graph ft 3 l Table on Page 9: 1. "Carey-Temp" dust concentrations for each exposure was substantially greater than the comparable "Thermobestos" dust concentrations and in excess of even the most lenient TLV established for Jiuman exposures, i.e., 50 mppcf of air. 808811 7. 2. The existing exhaust ventilation system as installed on both band saws is incajuble of reducing the dust hazard, associated with the fabrication of "Carey-Temp", to within safe acceptable limits, i.e., 20 mppcf of air. Relative to the exhaust ventilation system: 1. The duct velocity in the downdraft ventilation system on both band saws is far below the recommended value of 4000 fpm. 2. The duct velocity in the overhead ventilation system on both bind saws is equal to or more than the recommended value of 4000 fpm. 3. The velocity in the downdraft ventilation systems for both band saws could be increased by patching all holes, leaks, etc., now in existence. RECOMMENDATIONS: 1. Do not fabricate 18" x 36" x 4" "Carey-Temp" or "Thermobestos" insulation materials unless: . a. The atmospheric dust problem can be reduced to below 20 mppcf of air through the use of improved ventilatjbn techniques or repairs to the existing system, or b. The manufacturers of the two makes of insulation materials are able to produce a product which will not release, upon fabrication with a band saw, dust concentrations in excess of 20 mppcf of air. REP: hi 23 October 1063 Submitted 808812 -............... INDUSTRIAL IriGIDK SURV1.Y Evaluation of Atmospheric IXist Conditions at tho Construction Insulation Shop Table #1 Atmospheric Djst Concentration Data Collected When Using Only Partial Ventilation, i.e., Only Below the Blocks Date 25 Feb 63 24 Jan 63 6 Mar 63 25 Feb 63 24 Jan 63 6 Mar 63 Cutting S Edging Insulation Blocks Type of Material Kaylo Thermobestos It Kaylo Thermobestos tt Description of Location #1, i.e,, South Side of the #2 Band Saw ^ II II It It II It II II ^ II It It 1? It It It It #2, i.e., South Side of the 01 Band Saw 1^2 u it ii i* it ii ii ii it m m it it it Concentration in mppcf 9.32 10.00 51.50 17.92 26.36 42.70 Date Mar 62 25 Feb 63 Mar 62 24 Jan 63 6 Mar 63 Mir 62 25 Feb 63 Mar 62 24 Jan 63 6 Mar 63 Cutting a Radius on Insulation Blocks Type of Material Kaylo II Tliermobestos II It Kaylo II Thermobestos II II Description of Location #3, i.e., South Side of the 02 Band Saw #3, It tt tt tt It ft tt fl 03, II It tt If If tt II ft #3, 03, II tt tt It II It II II If If tt II It If ft II 04, 04, i.e., It South ft Sidfte of If tlie If 01 ft Band II Saw fl 04, II If It t If If If If 04, It It It fl II II II fl 04, It ft tt If II II II II Concentration in mppcf 17.10 3.30 101,40 69.50 36.82 3.06 29.35 83.30 66.60 70.00 808813 Date 6 Mir G3 26 Feb 63 6 Mir 63 26 Feb 63 Tabic n Atmospheric Dust Concentration Mata Collected When Using All Available Ventilation, i.e., Both Above 6 Below the Blocks Cutting 6 Edging Insulation Blocks Type of Material Tliermobestos Carey-Temp Thermobestos Carcy-Temp Description of Location #la, i.e., South Side of the #2 Band Saw II It H H H N It II #2a, i.e., South Side of the #1 Band Saw 02a ii H 1 it > H n H ii Concent rv.t ion in mppcf 30.20 51.70 17.50 68.20 Date ^ 6 Mar 63 6 Mir 63 26 Feb 63 26 Feb 63 Cutting a Radius on Insulation Blocks Type of Material Thermobestos Thermobestos Carey-Temp Carcy-Temp Description of Location #3a, i.e., South Side of the 12 Band Saw #4a, i.e., South Side of the 11 Band Saw 11 ii it ii y n if ti #Sa, i.e.. North Side of the fl Band Saw Concentration in mppcf -22.42 51.70 85.40 100.90 index for Graphs #1, #26 S3 //l South Side H?. - Cutting Blocks - Ventilation Only Belov II7 II3 r 11 nII II 87 It It - Edging "- - Cutting a Radius - //l . '/hi : II.\i :: it " " II SI It 97 II HI II It It - Cutting Blocks - - Edging " Both A'.ovo It tf 'Low it #3.i M II H2 tt - Cutting a Radius - ;/4".4| -~ M 111II IT A ft -- -- n/7/55a =- N/foorth Side Hi Rind Saw - Cutting a Radius - Ventilation Both Alow r. Below Trial 1 2 3 Trial # 1 2 3 Table 113 Determination of Percentage Crystalline Free Silica Present in "Thermobestos", "Kaylo" 6 "Carey-Temp" as Quartz by the "Talvitie" Method 808814 10. "Thermobestos" (As Contained in Report 62--III-l--G-l) Wi in Grams W2 in Grains W3 in Grams % Free S1O2 0.5002 0.5000 0.5002 0.0390 0.0347 0.0396 0.0069 0.0068 0.0082 Average Percentage Crystalline Free S1O2 = 6.4 6.42 5.58 6.28 "Kaylo" (As Contained in Report 62-IH-l-G-l) in Grams W2 in Grams W3 in Grams % Free S]_02 0.5000 0.5000 0.5000 0.0807 0.0730 0.0563 0.0433 0.0364 0.0190 Average Percentage Crystalline Free S1O2 = 7.4 7.48 7.32 7.46 "Carey-Temp" (As Reported by Mr. Thomas M. Durkan) 4 October 1963 # Table 04 Ventilation Rates on Two Band Saws 808815 11. Date Hood Being Band Saw Clicked Description of Condition Vent Hation Pate in fpm ------ 25 Feb 63 6 Mir 63 25 Feb 63 6 Mir 63 25 Feb 63 6 Mar 63 02 If 2 H2 II2 02 n Downdraft It If ft II If 25 Feb 63 Mir 63 n n OverhIfead 25 Feb 63 II2 . If 6 Mar 63 ___ 02 II Only Downdraft System in Operation II II II II II Downdraft 6 Overhead System in Operation If II If II It Every Hood in the System Open If ft II fl If tl Downdraft Overhead System in Operation tl tl ft U 11 11 Every Hood in the System Open II If It II 11 f 1500 1'iSO 1200 1200 050 900 6500 U800 . 4000 - 25 Feb 63 6 Mar 63 25 Feb 63 ^ 6 Mar 63 ^)25 Feb 63 6 Mar 63 25 Feb 63 6 Mar 63 25 Feb 63 6 Mar 63 01 01 01 01 01 01 III 01 01 01 Downdraft II If It ft II ,, Overhead tl n if Only Downdraft System in Operation II If II II tl Downdraft Overhead System in Operation it n it it it ii Every Hood in the System Open II It II It If II Downdraft Overhead System in Operation It II II ft fl fl Every Hood in the System Open It t II It II II 2100 1500 1600 1150 1100 5500 4500 4200 t h- --07* O < --J s zH h- < U cc CQ iDn Z Ul > H* k&a u<. m < Otf UJ O 0 X hin" UJ dC 5: $ cO 0 O0 CO UJ 0C D in O tt UJ X h* >- Z 0 CL X 06 X h-- Ul 0 iHn -j > in O <X Ou 9 Band S r 808816 k #2 Ita d Saw Ita d S t* Band S jtv jo jrxidu irr nuot jrjjuoouo,*) ft oo tsOv* z ? u f-- O u Cl XX O IM ct > 6 WI _4 oM. 571 X D to to X A. n tM a. < MVI to > K nt O H oo to h> to IA4 o 5p. CJ OK SEfM h* tO tM X h- X5 CV J*H V C9 -TMW V tv f >1 19 n* IV JW 80881 \i C9 9 f l B u t S* jO 3* n d Saw Baj>4 S t * 8a4 Sa / l . (oi # C9 H t KiHC9 J^VI 9 IC9 f *>1 JTV JO joddui UT UOiaPvUUDOUOO f l f t f \ / IBand ! * S and Saw Band Saw Sand Saw Sand Saw 808818 > \jC 1f > ifiT^nasAi- o^rmnarowooNOB 808819 MMS'Ct! CA?If3IF*r CHttKIBGAUB COMPANY INSTITUTE PLANT f. 0. BOX 28)1. CIIAMSfON, WIST VIRGIN. It IHtMtl K. J. Sexton, M.D. C***T Medical Department - Flant 512 CffH Mr. I.. N. Dickinson Mr. N. S. Eastman Mr. S. C. Giambruno Mr. R. A. Huber Mr. H. F. King Dr. E. M. Best Dr. C. U. Demehl Mr. J. W. Mr. P. E. Mr. R. A. Mr. D. R. Mr. N. H. Mr. L. B. Hr. F. G. d(." ~ 29 November 19G3 Ori9h*iim, o?t. Industrial Hygiene - Plant 512 llffir foftT Construction Insulation Glop Building 511-2018________ -- -- _________________________________ _____________________________________________________________________________________________________ In accordance with Mr. P. E. Henry's request of Thursday, 7 Nov 63, I have investigated the fabrication of "Carey-Temp" pipe covering. This operation is carried out with band saws and, on the basis of visual observation alone, it has been decided that there should be no health hazard associated with this particular type of operation. This investigation took place during the morning of Tlwrsday, 14 Nov 63, in the company of Mr. K. B. Lanham, Foreman of the Fabrication Insulation Shop, and consisted merely of observing the process of the cutting of half sections of eight inch diameter "Carey-Tcmp" pipe covering with a lurid saw. Wo effort was made, at that time, to determine the actual concentration of atmospheric dust being produced during this operation. It should not be necessary to perform this specific test so long as working conditions are not altered appreciably from those observed on this date. However, a more thorough evaluation of these conditions will be performed if Cl) it is'specifically ;ve,j jested, (2) employees begin complaining about reactions such as no: bleed, etc., (3) a thicker material, i.e.,more than two inches in diameter r substitute'1 for fabrication, or (4) the fabrication shop begins cuttiv e ich curved half-section from large blocks of "Carey-Temp". Very truly yours. Rj:i-:hl R. E. Pcelo Industrial Hygienist * *I \' j1 .. 9f }, k ' i U >, . ' i' > 11 M. ' r. ')'0 i)LM O l >1 E it] I e IJ I V I 5 \ G M i*.sn:u!i ri/w: i . n-.u: , > 808820 i < - ; - '.:.i i. I - ; '.I ' j I !,d .stria!. ilv:'i'j.T: - 'Ji." \ foi'l ! i .. 11 j ' .< 'm flit.*.- 'ny ..I'M f\ .. - '} ;i ' .v'iji . "v*** . i1 ! r.' j'i I! vl' : .1/ " i:.: La!'10!. .>.* Tulv* ix'ceivcd results from the cu'-t tvc.irljj.r, s<;ri':s .or; '* ad . : v.' :r jlf.-p wnile ti.c ..rad ^rinuer machine was hcinr used t ; cut -i: " ir.-1.! . i; t " < r, `iher.e ri.ilts indicate th.it r!ie ha.vu*! to liealtl. frr. -luM i: r <tuU'j!i i . very :;li;;ht an'J sh.-uld not j in-exit env r.c.ri :?. tic m-vrhjn aixjrntor if conducted in a similar .winner t o'he t- : ;tor ions. I.urja/, 'u: conversation, you mer.ciuicl Uv\t yti .mt\<'i>.te hir to cui..>uer Libation in tl*i slop and also *rwi> in.- certain r>H'i at ii - i:.! .!?;:* ex.-Mti .t sy.t'jri. It is our mcct;ir:rlit ion t'.it the'" cln;i - r vat t tneir ''deletion in the near fut ux; .is to further :d t'1 o{ j ... !:: r rrjnpi tely f luili/V. f.' im'-rstic it Lon, .. r i- i* i- < t ' !-r, Liuf. when r.orc 'Jarcy-'i'.v.:." in :cci i:; : . ! . c.. a.i! nsctli: i cat ions have t<-!i !v ' / 11 , ' inter?'! :* tried, -'on Mv v- ,'! . x.s 11.- ii.u:!. di:::*irtr./.'it. .'iv trnl ir . -j :i., *'i .1 ^ ). L'. r. '.