Document BRm7Bz43QoQOpN60ay2v0jB3E

ASBESTOS FIBER COUNTS for Georgia Pacific Corporation Chicago, Illinois December 29, 1972 Personnel Present: Mr. M. Palrnowski Georgia Pacific Corporation Mr. E. J. Kleber Union Carbide Corporation Mr. T. P. Norris Union Carbide Corporation UNION CARBIDE CORPORATION Mining and Metals Division Niagara Falls, Now York PLAINTIFFS EXHIBIT SGP 0006578 DESCRIPTION OF PLANT AND TESTS Tests were conducted November 27, 1972 at Georgia Pacific Corporation, Chicago, Illinois, manufacturers of tape joint compounds. Dry ingredients are added at a loading hopper the load is then conveyed to a bagging machine. Both operations were monitored. APPARATUS AND PROCEDURE Sampling and dust counting were carried out In accordance with OSHA Regulation 1910.93a, using the Bayer, Zummalde 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 Leitz microscope utilizing phase contrast illumi nation at 400X and a Patlerson Globe and Circle reticle. Total dust was determined by light field microscopy at I00X. TEST RESULTS Three figures have been reported for each sample. They are: 1) Total Fiber - Any material 5 microns or longer having an aspect ratio of 3 or greater. Reported as fibers per milliliter. Note: This figure is considerably higher than the "possible" asbestos fibercount. The presence of Mica in the test accounts for the large figure. Mica, a mineral with a platelet-type appearance fits the strict rule of greater than 5 microns in length and having an aspect ratio larger than 3. However, It is obvious that these platelet structures are not asbestos,.nor even fibrous in nature. 2) Asbestos Fiber - Any material, 5 microns or longer, having an aspect ratio of 3 or greater, which in the judgment of the operator could possibly be asbestos. Reported as fibers per ml 11iIiter. 3) Total Dust - Any fiber or particle present. Reported as million particles per cubic foot. I NTERPRETATION SGP 0006579 The regulations have been established with the 5 fiber limit on a time-weighted average. This essentially means the figures must be arranged to show an employee's average Intake of fibers per milliliter on an 0-hour day. For example, the highest reading in the test was 3.6 fibers/ml. If this was the only contact with asbestos that day, the 2-minufe sample would be extrapolated to 8 hours, giving a time- wolnhtort .overarm of less than 0.02 flbers/ml SUMMARY OF DUST COUNTS N.B. No. Description 1929-64-1 EnvironmentaI - Bagging area, 3 ft. from operator (8 min.) at fill and dump area. 1929-64-2 Environmental - At loading topper during shaking (2 min.) of a load of dry mix. 1929-64-3 Persona I (2 min.) - Operator dumping Mica into loading hopper. 1929-64-4 Persona I (2 min.) - Operator dumping 2 bags 7RF9. 1929-64-5 Environmental - In office on top of file cabinets. "Poss1bIe" TotaI Fiber Tote Asbestos Count Count Dus Fibers/ml;?- 5 A Flbers/mlv 5/* mppe 0.9 2.6 e.e 3.4 6.8 o.c 0 82.5 51.1 3.6 16.0 18.'/ 0.4 0.8 2.C SGP 0006580 l