Document p2LmMoz5K0NDQYLk4mE9pne0d

DOW CHEMICAL U.S.A PLAINTIFF'S EXHIBIT DOW-757 April 13, 1987 TEXAS OPERATIONS 'REEPORT TEXAS 77341 9*lOS 1OOiS D. M. Remedy, A-651 xc: D. E. Cragar, B-101 W. Demin, B-101 J. L. Kiggans, B-101 C. L. Lee, A-650 A. L. McDowell, B-101 C. L. Sandlin, B-101 ASBESTOS MONITORING RESOLES FOR BRAKE SHOE REPLACEMENT & TRANSITS REMOVAL AT MAG*ESIUM FRDCUCTICN A MAINTENANCE IBS FILE IA6-3097 Asbestos monitoring was conducted during a brake shoe replacement in the A-631 shop and a transits removal an the A-604 , 605 bridge an January 23, 1987 and February 17, 1987, respectively. Hie monitoring was conducted as required by OSHA 29 CFR 1910.1926.58. Hie workers performing both jobs ware full-face respirators with high efficiency particulate filters. Qualitative fit testing was nrwiiu-t-gH prior to the start of the jabs. Hooded Tyvek disposable paper suits and rubber boots were worn to keep fibers off of the workers' bodies. Hie brake shoe replacement job required both of the brake shoes to be removed and replaced. Hie work area was barricaded with yellow tape. Polyethylene sheet was spread beneath the tew motor to collect any debris. Hie brake shoes were removed from the brake drum as they were wetted with amended water from a garden sprayer. At the end of the job, all tools were cleaned with wet, disposable rags. Hie brake shoes, the disposable rags, the polyethylene sheet and the disposable coveralls were collected and placed in an asbsestos-labeled polyethylene bag for disposal. Hie respirator cartridges were covered with plastic bags, sealed with rubber bands and left on the full-face respirators until needed again. Monitoring during the brake shoe replacement was conducted by hanging the filter cassettes on the tow motor in the proximity of the workers' breathing zones. One cassette was hung by the left brake shoe and one by the right brake shoe. This was necessary since the workers were required to squat in an uncomfortable position and were unable to wear the equipment and perform their job efficiently. AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY L10SI001S Oo ASBESTOS TRANSITE REMOVAL SAMPLE SOC. SEC. # FILE #A6*3097 MGA-6 317-60-5084 MGA-7 DATE 2/17/87 SAMPLE TIME (MIN) 390 480 CONCENTRATION (FIBERS/CC) 0.05 0.04 MGA-5 MGA-4 466-88-3014 2/17/87 390 480 0.11 0.09 FILE #A6--3148A MPAM-13 370-48-5794 6/1/87 270 <0.01 480 <0.01 MPAM-15 466-88-3014 6/1/87 270 0.01 480 <0.01 MPAM-2 454-15-0664 3/23/87 150 480 0.02 <0.01 MPAM-4 466-88-3014 3/23/87 150 480 <0.01 <0.01 MPAM-10 457-78-4884 4/22/87 210 480 0.04 0.02 MPAM-12 121-54-6079 4/22/87 180 480 <0.01 <0.01 JOB PROCEDURE: Bolts were burned off of the transite sheets. The sheets were wetted with amended water, and whole sheets were placed on plastic covered pallets. The plastic was wrapped around the transite for transport to a plastic lined asbestos dumpster. All workers were trained and wore full-face respirators with HEPA filters and Tyvek suits. METHODOLOGY: Standard monitoring methodology was used. MDS 7/15/87 F 'U 1* / ) / , - Vy K)ar*>e: j. i '-.jm v .jlh P ja n r. H u A -, |>. A H u ,.))Pa' z i l h l k ' l K3anie ST00I5050 IBS FILE #A6-3097 ASBESTOS MONITORING RESULTS FOR BRAKE SHOE REPIACEMENTAND TRANSITE REMOVAL AT MAGNESIUM PRODUCTICN A MAINTENANCE 2 The monitoring results from the brake shoe replacement were both below the 0.01 fiber/cc action level when calculated as an 8-hour time weighted average. Therefore, the precautions taken to prevent exposures to asbestos dust, i.e. respirators euid disposable clothing were not required by OSHA. Future brake shoe replacement jobs should be conducted in the same manner as the monitored job, except disposable overalls will not be required. A half-face respirator may be substituted for the full-face respirator, but a high efficiency particulate filter is still required by Dow. The transite removal on the A-604 , 605 bridge was monitored due to the potential for encountering friable asbestos in old transite. A site inspection of the transite showed that most of the material was non-frlable; however, Idle edges of sane sheets were damaged. These edges were painted with latex paint or sprayed with amended water prior to removal. During the transite removal, yellow tape prevented access to the bridge by Magnesium I personnel. A faiso ceiling was constructed to catch falling debris and to prevent water damage to the occputer terminals on the bridge. The transite sheets were placed on a plastic covered pallet, sealed and transported downstairs by forktruck to the asbestos daqpster. The bridge structure was painted to encapsulate any loose asbestos fibers. Then the polyethylene false ceiling was folded in upon itself and placed in an asbestos-labeled polyethylene bag for disposal. The two workers monitored during the two and a half hour jab had exposures of 0.093 fibers/cc and 0.037 fibers/cc as an 8-hour time weighted average. Since one of the exposures was barely below the action level of 0.1 fibers/cc and due to the uncertain condition of materials twenty or more years old, the procedures used for this jab should be used in future transite removals in the magnesium plants. Exposure monitoring should also be done until a statistically significant data base is established. M. D. Smyth Industrial Hygiene Services db T