Document YDzjJDwyjbejabV9ep0pJvVZ8

Ui/'-oo & 22^ Prom: Mr. P. v.. Gregory . . , V.. .Mr. N. M. S'etchom fE L Mr. A . Pauley Mr. - '. c. Peny cred Ylffiom* Subject: Prelim inory Air Somplirr, Results for Y ibastos on Wcfober 26, 1967, Mr. M. E . Perry wonted to know If the asbestos insulators r* being exposed to ti^nifioont quantities of asbestos dust that would ba harmful to the health of personnel. Ha olio gov# me o "Coutloo" lebal which l now being placed on the shipping contolnert by the manufacturer. The Threshold Limit Value (1 >67) far asbestos dust hat been ettebiithed at 5.0 million partlclet per cubic foot (MPPCF) of air by the Aeiericon Conference of Governmental Industrial Hygienists. Even though there hove been tome recent comr ants about the hazards of the tmali pertlculatet versus the long fiber atbestot, the TLV makes no itotement concerning this. I understand that o statement It planned for Inclusion in the near future about the hazards of one type (crocIdolite), but the limits remain the seme If the original sampling and analysis methods ere used (impinger sampling and light field counting on microscope). Too, there have been several articles relating cancer with asbestos in a disease, mesothelioma (tumor developed from the cells in the pleura). However, there ere articles that attempt to discount this occurrence. AsbestosIs will occur otter long exposures to excessive quantities of asbestos with symptoms: cough, dyspnea (difficult or labored breathing) subetamol chest pains, decreased chest expansion, weakness, emaciation, clubbed finger tips, and curved fingernails. Individual susceptibility varies. In order to evaluate the potential hazard to health that might be creoted from worn with asbestos In the Technical Center, air sampling was required. ' hove been trying since early t-ovember 1V67 to do air sampling when work was being done with a significant amount of asbestos to give reliable data. Air sampling was done April 23 and 24, IVv . However, the air samples for the 23rd ware not satisfactory and required some changes in the impingers to obtain reiiobie sampling. A slight bend was put In the intaxe tube of the imp Ingen to prevent pieces of asbestos from falling into the collecting media. Air sample* were collected In clean (as particle free at possible) impin^en containing >C milliliters distilled wotar. Thata small impinjars wara worn by fha UCC 006853 -2- Insulator neor Ms breathing cone operatesI by e portable on-the-belt pump. A Greenburg-Smith Implnger containing ISO milliliters distilled Motor wot operated In the vicinity above the operation. The Insulator* worked up the plpo being Insulated toward this sompier. TKo ottached sheet show* Information about tho air sampling <*nd results. Tho results shew that excessive amounts of asbestos could hava boon Inhaled creates quite a bit of duct as dawn by ramplot 1 and 4, If a poutr mw Is used, this probably would bo much higher* Tho fitting did not crooto at much problem until tho Imulatoc was reaching around provlouoly Installed asbestos. In doing so, apparently final are rubbed off by contact and became airborne. This was a dusty operation which justified Mooring respiratory protection. rasp!ratamptaMil ,*** The person working with or near asbestos operations and nls supervisor should bo able to judge mbother it will bo dusty or not. Techniques such os inoSrtag doimn.iho oshsstoi ce it (s being removed will reduce tho slust evolved during dismantling operations. A portable high velocity exhaust vacuum (Industrial vacuum cleaner) may be utilised to Weep asbestos particles In air below the TLV at the sewing operation. The fitter may roduea the dustiness In his surroundings by handling the asbestos carefully end refraining from uwrn ternary contact with the materiel resulting from rubbing against, hitting together, or unusual pounding. The long tone air sample (Greenburg-Sr*ith) showed that significant quantities of asbestos did net become airborne above the operation. Vvhen the result was calculated as a 30-mtnute release the findings shew that a maximum of 7.1 MPfCF bscams airborne. A Ir sampling will be dene during future asbestos operations to further evaluate the conditions. f. Mliiamt/ebc tenht UCC 006854 ASBESTOS AIR SAMPLING BUILDING 770 - LARGE SCALE FACILITY Equipment: Midget impingers Greenburg-Smith impingers Distilled water MSA Monitaire Air Sampler Pumps Vacuum pump Bausch & Lomb Microscope (100X, light field) DUNN cell Date: April 24, 1968 Time: 950a.m. - 3:25 p.m. Collected by: R. O. Midkiff Analyzed by: R. O. Midkiff UCC 006855 Sample Sampling Flow Rate, Net Count Net Count Net Count MPPCF MPPCF MPPCF Sampler Number Time, min. Ipm <1C*j lOp - 50jj <I0jj - 5(^j <IOp IQu^SOju <IQp-5Q(u Worn by Operation & Location 1 21 (on-off) 1.7 509 25.4 534.4 13.6 0.77 14.4 Cutting; ground level 2 22 1.7 140 4.0 144 4.0 0.12 4.1 3 20 1.7 620 160 780 1&8 4.9 23.7 4 20 (cont.) 1.7 500 19.4 519.4 15.8 0.6 16.4 Fitting; pipe perpendicular to floor Fitting; large pieces than previously; reaching around the asbestos (hugging) Cutting; ground level 5 335 9:50 a .m. 3:25 p.m. 5 66 2.2 68.2 0.63 0.02 0.65 Greenbu rg- General Air; midpoint of Smith Impinger column (approx. 9' from floor 18 inches from column. No apparent up-draft In facility.