Document Qkmmk0REGvmOKNm64ee2EZx16
INDUSTRIAL HYGIENE REPORT
TEXAS OPERATIONS
DOW CHEMICAL USA AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY
FILE NUMBER; DATE ISSUED; PLANT CODE;
March 9, 1989
82 bo 6
TITLE
ASBESTOS MONITORING DURING TRANSITS REMOVAL AT FABRICATION SHOP, B-105, BY THE PLANT B CARPENTERS
AUTHOR(S)
R. L. WOOSTER
REV!EWER(S) SANDLIN C. ^jJanjteCr.
C
SUMMARY
Area asbestos monitoring was done during a transite removal job at B-105 Fabrication Shop on February 9, 10 and 13, 1989. 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 Permissible Exposure Limit (PEL)' of 0.2 fibers per cubic centimeter. The highest level found was 0.05 fibers per cubic centimeter during the transite removal job.
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DISTRIBUTION D. E. Cragar, B-101 C. K. Browdy, M.D.,.B-101 W. J. Landry, B-3501
S. L. Smith, B-108 J. E. Oswalt, B-106 F. H. Koppe, B-106
T. Easley, B-105 D. F. Gonzales, B-105 M. G. Swank, 1803, Midland G. W. Engdahl, 1803, Midland *L. W. Rampy, 1803, Midland
*J. E. LeBeau, 1803, Midland *Cover Sheet Only
RLW
RESTRICTED FOR USE WITHIN THE DOW CHEMICAL COMPANY ONLY
IHS File Bl-3467
Page 2
ASBESTOS MONITORING DURING TRAN8ITE REMOVAL AT FABRICATION SHOP/
6-1051 BY THE PLANT B CARPENTERS
INTRODUCTION
Area monitoring for asbestos was done during the removal of transits panels located in the Fabrication Shop, B-105. The removal was done by Dow Plant B Carpenters. The monitoring was conducted to ensure that the use of approved job procedures would result in acceptable 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. The highest level found was 0.05 fibers per cubic centimeter during the transits removal. All exposures exposures were potential since workers within the regulated areas wore half-face respirators with high-efficiency particulate air (HEPA) cartridges.
2. 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.
RE8ULTS AND DISCU88I0N
Table I shows the results of area monitoring during the removal of transite panels. The highest area measurement was 0.05 fibers per cubic centimeter, located in the shop area near the removal site. Results showed that all measured concentrations were well below the OSHA PEL of 0.2 fibers per cubic centimeters.
The results clearly showed that the potential for harmful exposure to asbestos during the transite removal job was very low. As long as the proper procedures for asbestos handling are followed there should be no problem of overexposure to asbestos. The procedures for transite removal are outlined in the Texas Operations Asbestos Handbook.
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IHS File Bl-3467
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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. NXOSH method 7400 used.
EVALUATION CRITERIA
The evaluation of exposure levels was based on the following criterion:
AGENT
EXPOSURE GUIDELINE
SPEBSE
Asbestos
0.2 fibers/cc
OSHA (PEL)
The OSHA Permissible Exposure Liftit (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.
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IHS File Bl-3467
AREA
TABLE Z ASBESTOS MONITORING DURING TRAM8ZTB REMOVAL
AT B-105 FOR THE FABRICATION SHOP
SAMPLE NUMBER
DATE
SAMPLE TIME (MIN)
CONCENTRATION (ibers/cc) TWA
In shop area near removal site
2889-2
2-9-89
Outside perimeter line near disposal pallets
2889-3
2-9-89
In shop area near south door
2889-4 2-9-89
In shop area near removal site
2889-5 2--10-89
Outside perimeter line near disposal pallets
2889-6
2-10-89
In shop area near south door
2889-7 2-10-89
In shop area near removal site 2889-10 2-13-89
Outside perimeter
line near disposal
pallets
2889-11
2-13-89
In shop area near south door
2889-12 2-13-89
441
441 441 435
455 450 335
331 331
0.050
0.004 0.006 0.010
0.004 0.003 0.006
0.003 <0.010
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McKEE ENVIRONMENTAL HEALTH SERVICES
lllUSugcpurk I (ouMton. TX T70H9 (713) 48I-JK01
February 20, _989
LAB ANALYSIS REPORT
Client:
Test Performed Lab Nuibtr:
Dow Chesicai USA Attn: K.J. Sorrell*. B101Y
Texas Operation* Freeport. TX 77541 NIOSH Analytical Method #7400 Fiber Count* (Asbestos) 6992
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rlttids
Fibers
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27.5
35.03
2A 100
6.
7.64
" 3A
100
3.
3.82
4A 100
1.5
1.91
5A IOO
5.
6.37
" 6A
100
7.
8.92
7 A 100
20.
25.48
" SA
IOO
2.
2.55
9A 100
6.
7.64
" 10A
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13.
16.56
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1.5
1.91
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3.82 2.55
92 101.
i28.66
2 100
H 100
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5 100 100
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10.5
13.5 20.5 10.5
9.
13.38
17.2 26.11 13.38 11.46
8 IOO
0.5
0.64
9 100 10 100 tl 11 100 12 100
2. 11.5
7.
1.5
2.55 14.65
8.92 1.91
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101.5
587.7
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22.93
i
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68
102.5
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