Document QXnX40aD9nxzqd6OKdDDJKnq6

PLAINTIFF'S EXHIBIT INDUSTRIAL HYGIENE REPORT TEXAS OPERATIONS DOW CHEMICAL LISA AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY rlenumber:b1.,402 DATE ISSUED: December 19, 1988 PLANT CODE:82006 TITLE: ASBESTOS MONITORING DURING TRANSITE MODIFICATION AT B-6803 BY THE PLANT B CARPENTERS AUTHORS) C. L. SANDLIN REVIEWER(S) D- E. CRAGAR SUMMARY &.X ll g- A /-s-rt /~3-f9 Short-tens personal asbestos monitoring was done during a transite modification job at B-6803 by the Plant B Carpenters on November 9, 1988. The monitoring was done to ensure that the approved asbestos handling procedures would result in acceptable airborne concentrations of asbestos. All measured asbestos concentrations were well below the OSHA STEL of 1.0 fiber per cubic centimeter (30 minute period) for employees performing the job. The highest personal short-term level found was 0.063 fibers/cc. co CD O cn co co Distribution: D.E. Cragar, B-101 C. K. Browdy, B-101 H. C. Hewett, B-3501 J. E. Oswalt, B-106 S. L. Smith, B-108 A. M. Stevens, B-106 G. W. Engdahl , 1803, Midland M. G. Swank, 1803, Midland *J. E. LeBeau, 1803, Midland *L. W. Rampy, 1803, RESTRICTED f=OR USE WITHIN THE DOW CHEMICAL COMPANY ONLY IHS File Bl--3402 Page 2 ASBB8T08 KOHITORINO DURING TRANSITS MODIFICATION AT B-6803 BY THS PLANT B CARPENTERS. INTRODUCTION Personal monitoring for exposure to asbestos was done during the modification of transite siding at B-6803 by the Plant B Carpenters. The job consisted of cutting two holes measuring approximately 2 to 2 1/2 inches. The monitoring was done to ensure that the use of approved job procedures would result in acceptable airborne concentrations of asbestos. CONCLUSIONS AND RECOMMENDATIONS STOOI 5374 1. All measured asbestos concentrations were well below the OSHA Permissible Exposure Limit (PEL) of 0.2 fibers per cubic centimeter and the OSHA STEL of 1.0 fiber/cc for a thirty minute period. The highest level found was 0.063 fibers per cubic centimeter during the thirty minutes that it took to to drill holes in the transite. All exposures were potential since workers within the regulated areas wore half-face respirators with high-efficiency particulate air (HEPA) cartridges. 2. A local exhaust method was used during the drilling and removal of the transite material. The method used is described on Table I of this report. Texas Operations asbestos handling procedures must always be followed. The Texas Operations Asbestos Handbook and Safety Standard T-12 must be reviewed. These procedures are designed to make the transite removal jobs safe. If these procedures are not followed, a potentially serious exposure or safety situation may result. For this reason, the asbestos handling procedures must be reviewed, understood, and enforced by all personnel involved in the asbestos removal jobs. RESULTS AND DISCUSSION Table I shows the results of personnel monitoring during the drilling of transite siding. The highest potential personnel measurement was 0.063 fibers per cubic centimeter, for the 25 minute job. Results showed that measured short-term concentrations were well below the OSHA STEL of 1.0 fibers per cubic centimeters for a 30 minute period. IHS File Bl-3402 Page 3 ASBESTOS MONITORING DURING TRANSITS MODIFICATION AT B-C803 BY THB PLANT B CARPENTERS DISCUSSION AND RESULTS (CONT') The results clearly show that the potential for harmful exposure to asbestos during the drilling and removal of transite jobs is very low when local exhaust ventilation is used when glove bag or enclosures are not feasible. However, improvement is needed in the asbestos handling procedures (i.e. pre-job meetings, ensuring job procedures are followed, etc. ). These procedures are designed to make the transite removal jobs safe. For this reason, the asbestos handling procedures must be reviewed, understood, and enforced by all personnel involved in the asbestos removal jobs. ST00I5375 METHODOLOGY Asbestos samples were collected using Gilian HFS 513A and 113A air sampling pumps. A known volume of air was pulled through a 25 millimeter mixed cellulose ester membrane filter, 0.8 micron pore size. Samples were collected at a flow rate of approximately 2.0 liters per minute. The pumps were calibrated before and after the sampling, and the samples were counted by McKee Environmental Health Services using phase contrast microscopy. NIOSH method 7400 used. EVALUATION CRITERIA The evaluation of exposure levels was based on the following criterion: AQEWT Asbestos EXPQSVRE SEIDELIEE 0.2 fibers/cc (8-Hr.TWA) 1.0 fibers/cc (30 minute) SOURCE OSHA (PEL) OSHA (STEL) The OSHA Permissible Exposure Limit (PEL) is the time-weighted average concentration for a normal 8-hour workday, 40-hour work week, to which nearly all workers may be repeatedly exposed without adverse health effects. The OSHA Short-term Exposure Level (STEL) is the excursion limit averaged over a thirty minute period. IHS File Bl--3402 TABLE Z ASBESTOS MONITORING DURING TRANSITS MODIFICATION AT B-6S03 BY THE PLANT B CARPENTERS ST00I5376 Master Number 138138 134272 Sample Number CS6803-1 CS6803-2 Date _ Sample Time (Min) 11-9-88 24 11-9-88 25 08HA STBL (30 MIN) Concentration (fibers/cc) TWA 0.02 0.06 1.0 NOTE: The following job procedure was used: Two holes, approximately 2 to 2 1/2 inches, were drilled through a transits wall.The transite material was kept wet during the entire job. During the entire procedure a HEPA filtered vaccum was used to in the immediate area of the drilling to remove any contamintation. All the requirements in Section XI, under Transite and asbestos shingles cutting, drilling, or abrading minimum requirements were followed during the job. STOOI 5377 IP1UU61K1AL HTUltNt 5NVl <tUJKU rCtcJU. ?ZLOO(s p:t^ NO. &!' 246 2* )PR0CE; OAj^ty^tb^)/A*u,*at, *X'&,&03 1DATE //-?-gg Material Qj^is^ros[sampling method |r;PE or pu^T// ^ Iflow set AST/nrnf|f4to/7ww/4RrvAa&TtEe [trapping ^mediumFACfaT*>7zZ. F-MARKS (VBrTIIATlON. ETC.) Q&dpssn-f*/ZS oZP&tA?* 9L- JL* -/ra . I y. ?_ (-I-t-J--Y--Y-,ia--u--i-s--* *.ZTTT^.. TV'T-^ - v / AJ sample SAMPLE NO DESCRIPTION j. PUMP <3099 ?/VCtKJ /&?/Z - 4?/Q 3 /)Ta<6/z it--/ ? SL 6sli43 At ` y^t,, A* ROTO- TOTAL METER TIME START STOP z TOTAL LITERS A/R: 4tJlc&Ko ^ ~---^rvrf r rr^a. firm r ~~ -Z/X yazo-l. eumelIJn JPJctOrJz rrxLXTtJL * CLta3 #9- CC-/m<A/ START 92. s- STOP total liters air: .sv. ft T7E. JL22 PUMP S/N (2i P- 3 $/<?~n/c <9 START STOP TOTAL LITERS AULL signature: . 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