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50933 /DOW CHEMICAL U.S.A. 72X1 TEXAS DIVISION FREEPORT, Tr;:^s 77541 ENVIRONMENTAL HEALTH REPORT AIRBORNE AS3EST0S SURVEY PERSONNEL MONITORING CHLOR-ALKALI , A-108 file mo- Al-8 22 natp February 19, 1976 AUTHOR. H- N. Edwards CHECKED DAT E. ??Jr. zc.. Summary Sixty workmen within the Chlor-Alkali area were monitored for potential exposure to airborne asbestos. No workman exceeded the present or proposed levels for a Time Weighted Average (TWA), but five workmen have a potential for exceeding the proposed peak values. It is recommended that peak level evaluations be made during the year. It is also recommended that your present personnel protective procedures be continued. ' ' It is further recommended that each workman be informed of the results of this survey, the hazards of overexposure to asbestos, and re-informed on the proper methods of control. This informing should be documented. CO CD CD CD CO DOW CONFIDENTIAL Di stribufion D. E. Billings A108 W. H. Caines OCD S. F. Edquist B2224 R. E. Flake B101 W. H. Fletcher B101 w. King A108 (2) RL R. Langner 1803 Bldg.-Midland ^Rarlene Swank 1803 Bldg.-Midland * F. D. Axe - California * C.- E. Caldwell - OCD * C. E. Halphen - Plaquemine --t" * R. D. Olson 607 Bldg.-Midland * C. L. Sercu - Ohio i J. D. Laman B1226 0. F. Schumm B101 File AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY 408777 File Al-822 2- - February 19, 1976 INTRODUCTION The Occupational Safety and Health Act (OSKA) requires that occupational exposures to airborne asbestos be controlled so that no worker is exposed to more than 5.0 asbestos fiber per cubic centimeter of air based on a count of fibers greater than 5 micrometers in length. These are determined by a Time- Weighted 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. ' In July, 1976, the limit will be lowered to 2.0 fibers per cubic centimeter. 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 Chlor Alkali I to evaluate the worker exposures by personnel monitoring. The tests were taken from November 4, 1975 - December 16, 1975. METHODOLOGY Airborne samples were collected using a Bendix Permissible air sampling pump (Bendix Corp., Baltimore, Md.). The fibers were collected by pulling air through a Millipcre filter (AAWG 03700) mounted in an open face Millipore disposable cassette. Flow rates for the pumps were calibrated at 1500 cubic centimeters per minute and sampling times were two hours or greater (Table I) . All samples were collected by Wayne King of Chlor-Alkali I. Samples were analyzed by Lee Martin of Central Laboratory using the following technique: Four marked squares, are cut from a filter about halfway 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 min.). The sample count is made on a Reichert Zetopan. Optical microscope using Normaraki interference contrast at 500 magnification. Counts are made for particles greater than 5.0 microns, and reported as fibers per filter square. Clearing solution: 0.1 g/ml clean Millipore filter paper in 1:1 diethyloxalate: dimethylphthalate. ST0003 I I 2 408778 File Al-322 -3- Februarv 19, 1976 RESULTS Results of the airborne sample analyses are shown in Table I. All levels are below the new proposed standards. DISCUSSION Samples collected during these dates show no levels above the 0. 5.fiber, new recommended standard, although several of these workmen do show a potential for overexposure, by possibly exceeding the peak of 5.0 fibers/cc. '; If a workman did receive all of the sample that is shown in Table I, in a 15 minute period, and then no other exposure for the rest of the day, then those whose levels are 0.156 (Table I) and above, would be over the 5.0 peak level. Five workmen would exceed this new limit. CONCLUSIONS Since an asbestos dust respirator is required by the workman handling the dry asbestos, no workman is likely to be over exposed even to the new standard. RECOMMENDATIONS 1. It is recommended that peak level evaluations be made during the year. 2. It is also recommended that your present personnel protective procedures be continued. 3. It is further recommended that each workman be informed of the results of this survey, the hazards of overexposure, and they be reinformed of the proper methods of control. This informing should be documented. 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