Document MJ9N59aNwQmRvZgxy543yZ4Ly
INDUSTRIAL HYGIENE REPORT
TEXAS OPERATIONS
DOW CHEMICAL USA AN OPERATING UNIT OF THE DOW CHEMICAL COMRANY
FILE NUMBER ai.vm
DATE ISSUED: December 19,1988 H20U6--------------------
PLANT CODE:
TITLE:
ASBESTOS MONITORING DURING TRANSITS MODIFICATION AT B-1313 BY THE PLANT B CARPENTERS
PLAINTIFF'S EXHIBIT DOW-832
AUTHOR(S)
C. L. SANDLIN
REVIEWERS)
D. E. CRAfi&R..
y i Q. . (IaAMU
/-s-p9 I-3-Z9
SUMMARY
Short-term personal and eight-hour area asbestos monitoring was done during a transite modification job at B-1313 by the Plant B Carpenters on November 4, 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 and below the Permissible Exposure Limit (PEL) of 0.2 fibers per cubic centimeter for area samples taken during the job. The highest personal short-term level found was 0.037 fibers/cc. The highest area sample obtained was 0.004 fibers/cc.
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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 FOR USE WITHIN THE DOW CHEMICAL COMPANY ONLY
IHS File Bl--3401
Page 2
ASBESTOS MONITORING DURING TRANSITS MODIFICATION AT B-1313 BT THE PLANT B CARPENTERS.
INTRODUCTION
Personal and area monitoring for asbestos was done during the modification of transits siding at B-1313 by the Plant B Carpenters. The job consisted of cutting nine holes measuring approximately twelve inches by twelve 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
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 0.037 fibers per cubic centimeter during the thirty minutes that it took to to drill and cut the transits. All area samples ranged from less than 0.001 to 0.004 fibers/cc. 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 and removal of transite siding. The highest potential personnel measurement was 0.037 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.
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IBS File Bl--3401
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A8B88T08 MOVXTORXM DURING TRAM8ITB MODIFICATION AT B-1313 BY TH1 PLANT B CARPENTERS
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Table II shews the results of area monitoring during the drilling and removal of transits. The area measurements ranged from 0.001 to 0.004 fibers/cc. All measured concentrations were veil below the OSHA PEL of 0.2 fibers/cc.
The results clearly show that the potential for harmful exposure to asbestos during the drilling and removal of transits 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. pro-job meetings, ensuring job procedures are followed, etc. ). These procedures are designed to make the transits 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.
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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:
AGENT
EXPOSURE GUIDELINE
S2EBSE
Asbestos
0.2 fibers/cc (8-Hr.TWA) 1.0 fibers/cc (30 minute)
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.
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IHS File Bl--3401
TABLE Z
ASBESTOS MONITORING DURING TRANSITS MODIFICATION AT B-1313 BT THE PLANT B CARPENTERS
Master Number ,
Sample Number
133058
CS110488--4
139749
CS110488-5
Date
Sample Time (Mini
11-4-88
27
11-4-88
24
08HA 8TEL (30 MIX)
Concentration (fibers/cc) TWA
0.009
0.037
1.0
NOTBl
The following job procedure was used:
Twelve inch square holes were cut by drilling holes approximately every 3/4 inches around the outside of the squares and breaking the inside area of the transite out with a chisel and hammer. The transits material was kept wet during the entire job. A damp foam block was placed to the back side of the transite wall to prevent any pieces of transite from falling inside. 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.
T
IHS File Bl-3401
TABLE ZZ
A8B18T08 X08ZT0RZ80 ODRZKO TRAM8ITB M0DZTZCA7Z0V 87 B-1313 BY TH8 FXJUR B CMPUmi
ATSA
Outside yellow tape area
Sample
Concentration
Sample
Time
(fibers/cc)
Hvrabor_____ Eats________(Min)_________ twa________
CS110488-1 11-4-88
321
<0.001
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In warehouse on CS110488-2 cabinet under area where drilling transite
11-4-88
338
0.001
Inside warehouse CS110488-3 11-4-88 on drum rack
342
0.004
OSBA FBL
0.2
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