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50683 DOW-CHEMICAL U.S.A. TEXAS DIVISION FREEPORT, TEXAS 77341 ENVIRONMENTAL HEALTH REPORT AIRBORNE ASBESTOS PERSONNEL MONITORING CHLORINE 6 BUILDING A-5024 file no. A5Q-1686 n*TE Movpmhpr 22 f 1678 author R. N. Edwards 72V. CUee/ CHECKED. DATE Summary None of the 99 samples analyzed for airborne asbestos was above the required level of 2.0 fibers/cc. It is therefore concluded that employees are not being overexposed to asbestos within the Chlorine 6 area. It is recommended that each employee be made aware of the results found, the hazards of overexposure and the necessity for keeping these leyels below the prescribed limit. This informing should be documented. ^ 0 O cn cn cr> bhs Distribution D. E. Billings A-5024 R. E. Flake B-101 0. N. Hollis A-1201 r. j. Loftus A-5024 v/File L. W. Rampy 1803 Midland R. R. Langner 1603 Midland Marlene Swank 1803 Midland D. J. Roberts 2020 Midland * F. D. Axe - Pittsburg * C. E. Halphen - Plaquemine * R. J. McCormick - Strongsville * Neil Murray - Sarnia * R. D. Olson 607 Midland * S. A. Goode - OCD AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY p < -* File A50-1686 -2- November 22,1978 S T 0015665 INTRODUCTION The Occupational Safety and Health Act (OSHA) requires that occupational exposures to airborne asbestos be controlled so that no worker is exposed to more than 2.0 asbestos fibers per cubic centimeter of air based on a count of fibers greater than 5 micrometers in length. These are determined by a timeweighted average (TWA) exposure for an eight hour work day, and no peak concentrations of asbestos more than 10.0 fibers per cubic centimeter as determined by a minimum sampling time of 15 minutes. It is now proposed to lower the limit to 0.5 fibers per cubic centimeter with a peak of 5.0 fibers. This survey was conducted at Chlorine 6 to evaluate the worker exposures by personnel monitoring. The tests were taken from 9-15-78 to 10-18-78. METHODOLOGY Airborne samples were collected uaing a Bendix Permissible air sampling pump (Bendix Corp., Baltimore, Md.). The fibers were collected by pulling air through a Millipore filter (AAWG03700) mounted in a Millipore disposable cassette. Flow rates for the pumps were calibrated at 1100 cubic centimeters per minute and sampling times were three hours. All samples were collected by E. A. Engling and D. E. Lewis of Chlorine 6. Samples were analyzed by Central Laboratory using the following technique: Four marked squares are cut from a filter about half-way from the edge to the center. This section is then placed on a drop of clearing solution1 and placed on a microscope slide. The sample is covered with a cover slip and allowed to clear(about 15 minutes). The sample count is made on a Reichert Zetopan Optical microscope using Normarski interference contrast at 500 magnification. Counts are made for particles greater than 5.0 microns, and reported as fibers per filter square. RESULTS Results of the airborne sample analyses are shown in Table I. All levels are below the required limits. CONCLUSIONS Workmen are not being overexposed to asbestos within the Chlorine 6 area. 1 Clearing solution: 0.1 g/ml of clean Millipore filter paper in 1:1 diethyloxalate: dimethylphthalate. File A50-1686 -3- November 22, 1978 RECOMMENDATIONS It is recommended that each workman be made aware of the results found, the hazards of overexposure, and the necessity for keeping these levels below the prescribed limits. 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