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AIRBORNE DUST COUNTS for 11 PLAINTIFF'S EXHIBIT UC-4121 TAPE JOINT & TEXTURE PAINT COMPOUNDER. October 5, 1972 Personnel Present: E. J. Kleber Customer Service Representative Union Carbide Corporation T. P. Norris Midwest Region Sales Manager Union Carbide Corporation UNION CARBIDE CORPORATI DM Mining and Metals Division Niagara Fails, New York X 410734 The results of microscope counts for air samples collected at September II, 1972 are attached. Apparatus & Procedure Sampling and dust counting were carried out In accordance with OSHA Regulation 1910. 93a. Unlco Personal Air Samplers, 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 Patterson Globe and Circle reticle. Total dust was determined by light field microscopy at I00X. Test Results Two 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. 2) Total Oust - Any fiber or particle present. Reported as million particles per cubic foot. Enclosed for reference is a copy of the OSHA Standard for exposure to asbestos dust, which includes silica and inert dust limits. X410735 SUMMARY OF OUST COUNTS N.B. No. 1929-18-1 Personal Description - Dumping of Canadian asbestos during preparation of a batch of ready mix Asbestos Fiber Count ribers/ml> 5^ 2.59 Tota 1 Oust mmppcr 9.61 1929-18-2 Environmental - Twin mixing area 5 1/2 feet above hooded mix tank. Area where batch of dry joint cement (spray) is being prepared 0.54 2.17 1929-18-3 Personal - Twin mixing area during dumping of Canadian asbestos, CaCo3, clay, mica, cellulose and starch into hooded mix tank during preparation of dry joint cement 1929-18-4 Personal - At surfacer mixer during dumping of Ingredients for spray compound con taining CaCo3, clay, asbestine, cellulose and T-135-0 1929-18-5 Environmental - Bag filling area, 5 1/2 feet above floor near operator 3.34 4.66 1.71 9.09 26.32 5.13 X 4107: