Document yB0dwreBxOrb3vOG3GOapJ2r
PLAINTIFF'S LXilimi
INDUSTRIAL HYGIENE REPORT
TEXAS OPERATIONS
DOW CHEMICAL USA AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY
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FILE NUMBER: ft11*1403 DATE ISSUED: December 19, PLANT CODE:04700"
1988
TITLE:
ASBESTOS MONITORING DURING TRANSITE REMOVAL AT A-1128 FOR PLANT A REFRIGERATION
AUTHORS)
C. L. SANDLIN REV1EWER(S)
D. E. CRAGAR SUMMARY
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Area asbestos monitoring was done during a transite removal job at A-1128 Refrigeration Shop on October 4, and October 17, 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 Permissible Exposure Limit (PEL) of 0.2 fibers per cubic centimeter. The highest level found was 0.006 fibers/cc during the transite removal job.
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Distribution:
D.E. Cragar, B-101 C. K. Browdy, B-101 A. E. Davis, A-1128 L. E. Mowens, B-129 s. L. smith, B-108
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 All-3403
Page 2
ABBE8TO8 MONITORING DURING TRANSITS REMOVAL AT A-1128 FOR PLANT A REFRIGERATION.
INTRODUCTION
Area monitoring for asbestos was done during the removal of transite siding on the Plant A Refrigeration Shop, A-1128. The removal was done by Industrial Specialist Contractors. The monitoring was done to ensure that the use of approved job procedures would result in acceptable airborne concentrations of asbestos.
CONCLUSIONS AND RECOMMENDATIONS
ST0015380
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 0.006 fibers per cubic centimeter during the transite removal. All 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.
RESULTS AND DISCUSSION
Table I shows the results of area monitoring during the removal of transite siding. The highest area measurement was 0.006 fibers per cubic centimeter, located down wind on the restricted perimeter line. Results showed that all measured concentrations were well below the OSHA PEL of 0.2 fibers per cubic centimeters.
The results clearly show that the potential for harmful exposure to asbestos during the transite removal jobs is very low. 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.
IHS File All-3403
Page 3
ASBESTOS MONITORING DURING TANSITE REMOVAL AT A-1128 FOR PLANT A REFRIGERATION
METHODOLOGY
Asbestos samples were collected using Gilian HFS S13A 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.
ST00I538I
EVALUATION CRITERIA
The evaluation of exposure levels was based on the following criterion:
AGENT
EXPOSURE GUIDELINE
SOURCE
Asbestos
0.2 fibers/cc
OSHA (PEL)
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.
IHS File All-3403
TABLE Z
ASBESTOS MONITORING DURING TRANSITS REMOVAL AT A--1128 TOR PLANT A REFRIGERATION
ST00I5382
Area
Sample Number
In shop on top of cabinet near side working
1-10388
In shop area on back side - on top face shield case
2-10388
Outside perimeter 3-10388 line down wind
Inside office area located near outside door
4-10388
Inside shop area 1-101788 near removal site
Inside shop area 2-101788 near removal site
Date 10-4-88
Sample Time (Mini
394
10-4-88
398
10-4-88 10-4-88
387 399
10-17-88
420
10-17-88
420
OSHA PEL
Concentration (fibers/cc) TWA 0.002
0.004
0.006 0.005
0.001 0.001 0.2
INDUSTRIAL HYGIENE SAMPl' RECORD
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