Document O15Y1n2nb3b5ed3rkpEgj4G1X

THE DISCOVERY COMPANY UNION CARBIDE CORPORATION MINING & METALS DIVISION P.O. BOX 579 NIAGARA FALLS, N. Y. 14302 TEL: 716-278-3376 November 21, 1974 Mr. R. Favero Georgia-Pacific Corporation 1466 White Circle Marietta, GA 30060 Dear Mr. Favero: Enclosed is the report of our findings for the asbestos fiber count conducted October 28, 1974 at your plant. We believe the report to be selfexplanatory, but if you have any questions, please do not hesitate to call on Jack Walsh at our Atlanta sales office or me directly. Very truly yours Customer Service Representative EJK:cjb Enclosure CC: Mr. J. E. Walsh I V. SGP 0022068 AIRBORNE FIBER COUNTS for Georgia-Pacific Corporation Marietta, Georgia November 20, 1974 Samples Collected And Analyzed By: E, J. Kleber Union Carbide Corporation / Union Carbide Corporation Mining and Metals Division Niagara Falls, New York SGP 0022069 (OMin|m OMJ) ^oajj (oti.i* OBJECTIVES Monitor airborne asbestos fiber at Georgia-Pacific Corporation, Marietta, Georgia, a manufacturer of tape joint compounds. OPERATION MONITORED Air samples were collected October 28, 1974 during the manufacture of ready-mix tape joint compound. Personal breathing zone samples were collected from the operator who actually made the additions to the mixer. Environmental samples were taken near the site of asbestos addition and in the raw materials storage area. EQUIPMENT AND PROCEDURE * Sampling and dust counting were carried out in accordance with OSHA Regulation 1910.93a, using the Bayer, Zuinnalde and Brown method for counting asbestos fibers by phase contrast microscopy (Bureau of Occupational Safety and Health, Feb. 1969). Battery-powered air pumps. (M.S.A. type) calibrated to 2 liters per minute were used to collect personal breathing zone and environmental samples on millipore membrane filters of 0.8 micron porosity. Fiber counting was performed on a Vicker's phase contrast microscope at 400X utilizing a Porton reticle for sizing and field definition. TEST RESULTS Reported as fibers greater than 5 microns in length per cubic centimeter of air sampled. A fiber is defined as a material having an aspect ratio greater than 3:1. INTERPRETATION The OSHA regulations have been established with a limit of 5 fibers greater than 5 microns in length per cubic centimeter of air sampled on an 8-hour, time-weighted average (TWA). The formula C-jT^ + C^T^ + CnTn describes time-weighted average where C = fiber count in fibers/cc and T = time. In this situation, a time-wighted average could be calculated for the operator using personal breathing zone samples 0-20, 0-3, 0-6, 0-24, 0-36, 0-7, and 0-27 as follows: (3.9)(6) + (7.1)(4) + (2,5)(14) + (3.3)(13) + (0.4)(17) + (3.0)(13) + (0.6)(22) 6+ 4+ 14 + . 13 + 17 + 13 + 22 2.1 fibers/cc time-weighted average. This time-weighted average is, of course, for this day only and day-to-day variations could change these numbers considerably. Since this calculation only covers 89 minutes out of the 480-minute (8-hour) day, the 8-hour, time-weighted average is open to broad interpretation, for example, if the operator only handled asbestos for 89 minutes a day and if it was assumed that sample 0-27 represented his exposure for the rest of the day, an estimated 8-hour, time-weighted average could be set up as follows: SGP 0022070 -2- (3.9H6) 6 (7.1H4) + (2.51(14) + (3.3)03) + (0.41(17) + (3.01(13) + (0.6)(413) 4+ 14 + 13+ 17+ 13+ 413 42M ,, 480 0.88 fibers/cc TWA. In either case, all figures are well within the OSHA limits. .1 . SGP 0022071 issii*: SUMMARY OF FIBER COUNTS Sample No. 0-29 Sampling Time 13 min. ^0-20^) v ^ /' 6 min. 0-3 4 min. 0-15 0-6 \ 10 min. 14 min. 0-9 0-24 14 min. 13 min. 0-23 29 min. 0-36 0-7 0-27 0-26 17 min. 13 min. 22 min. 15 min. Description Flbers/c >5>w Environmental - Located in dry blending area, 2 ft. from hopper, 3-1/2 ft. off floor. During lunch break, no activity in the area. 1.9 Personal - Operator (Larry James) weighing out 212.5 lbs. 7RF9 and 87.5 lbs. SG-210. Includes adding these products to mixer. 3.9 Personal - Operator (Larry James) adding other dry ingredients to mixer and disposing of all bags In baler. 7.1 Environmental - Same location as 0-29 during addition of dry ingredients. 3.6 Personal - Operator (Larry James) between batches attending to other duties. (Helping packaging, marking cans, etc.) Generally not in dry blending area. Environmental - Same location as 0-29 between batches. 2.5 2.3 Personal - Operator (Larry James) preparing new batch of TJC. Includes addition of all raw materials and bag disposal. 2.3 Environmental - Same location as 0-29 during make up of batch of TJC. Includes time between batches. 1.2 Personal - Operator (Larry James) between batches. 0.4 Personal - Operator (Larry James) preparing new batch of TJC. Includes bag disposal. 3.0 Personal - Operator (Larry Jamas) after completion of duties at dry blending area. 0.6 Environmental - Located in raw materials storage area approximately 50 ft. from dry blending area. No asbestos within 20 ft. 0.2 SGP 0022072