Document gDzangVDe2ZEbYR8GGpB1EeeG

FILE NAME Kelly Moore KM DATE 1973 Nov 13 DOC KM018 DOCUMENT DESCRIPTION Report - Airborne Asbestos Fiber Counts for Paco Textures Corporation FIBER COUNTS AIRSORNE ASBESTOS ASBESTOS for Textures Paco Textures Textures Corporation Paco November \3, 1973 Personnel Pres Present Samp ies Collected | & Analyzed Mr. D. Merrill Corporation Paco Textures Mr. T. Fletcher (pacific) Crosfield Crosfield Harrisons ; Mr. J. Kleber Kleber By Union Carbide Corporation Inc. Mining Metals DivisDiiovnisLOiNon Falls New Niagara Falls, New York Niagara 01236 01236 PLAINTIFF'S PLAINTIFF'S -- -- 7 OBJECTIVES Monitor Airborne Asbestos fiber a manufactureorf Joint Cements at Paco Textures Corporation and Wall Textures San Carlos California OPERATION MONITORED of zone and environmental samples were collected October 17 1973 during Personal breathing and after the addition 210 to wall texture The bagger operator for that batch also monitored The required number of 210 bags were placed on a platform was adjoining the dry powder blender Bags were picked up slit and dumped into the blender one by one EQUIPMENT AND PROCEDURE - and dust counting were carried out in accordance with OSHA Regulation 1910.93a Sampling Zummalde and Brown method for counting asbestos fibers by phase contrast using the Bayer and Health Feb. 1969 microscopy Bureau of Occupational Safety Battery air pumps M.S.A. type calibrated to 2 liters per minute were used to environmental samples on millipore membrane filters collect personal breathing zone and : of 0.8 micron porosity Fiber counting was performed on a Vicker's phase contrast microscope utilizing a Porton . reticle for sizing and field definition TEST RESULTS Reported as fibers A fiber is defined greater than 5 microns in length per as a material having an aspect ratio cubic centimeter of greater than 3 air sampled INTERPRETATION a The O.S.H.A. regulations have been established with a limit of 5 fibers greater thTanWA 5 cubic centimeter of air sampled on time weighted average microns in length per where C = fiber count in The formula C T + C2T2 + CT describes time weighted average ET fibers and T = time For example the particular batch including bagging would dry be powder blender operator's exposure for 3.5 14 + 0.3 46 + 1.0 30 = 14 + 46 + 30 this 92.8 -90 1.0 fibers TWA This example based on the should number not be confused with an 8 hour time of batches per day as well as times weighted average of zero and near which would be zero exposure Sample Sample No 1 2 3 , 4 5 Field No 191 111 236 733 648 SUMMARY OF FIBER COUNTS Description Personal 14 min - Operator bringing 210 to loading platform and adding 120 to the dry powder blender Personal 46 min . - After addition of 210 during addition of other run Limestone equipment materials including limestone limestone is normally handled but an failure made it necessary to add by hand Personal 30 min - Operator bagging above batch of wall texture Environmental 58 min . - Four feet from charging hole 4-1 ft off floor on corner of bag preparation platform Monitored during addition of dry ingredients Personal 11 min ~ Same as 236 on a subsequent batch Fiber Count Fibers > 541 3.5 0.3 1.0 0.4 1.2 KMX 00170