Document Oz5v9912BN6MVeOMLZyJDE58v

UJl/' &&o INTERNAL CORRESPONDENCE -- CHEMICALS AND PLASTICS o (Name) Irvlsicjn oc&tron lopy to Mr. A. S. Howard Mr. D. R. Paugh Mr. H. L. Reveal Mr. E. C. Shipley Mr. J. W. Biddle Mr. C. w. Carman Mr. G. F. Hurley Mr. L. R. Noble Mr. F. Williams P. O. BOX 8361, SOUTH CHARLESTON, WEST VIRGINIA 25303 Dale August 25, 1977 Originating Dept IH/EP subiect Asbestos Monitoring at Institute -j , , Gentlemen: On August 15, 1977, air samples were taken during the removal of insulation possibly containing asbestos from the breech work at the powerhouse at Institute. Two insulators wore personal sam pling pumps during the operation. Also, an area sample was taken twenty feet downwind from the job. The area sample indicated a concentration of 0.48 fibers/cubic centimeters while the personal samples indicated concentrations of 2.59 and 2.61 fibers/cubic centimeter. These concentrations are higher than the current OSHA eight-hour, time-weighted average of two fibers/cubic centimeter of air. Therefore, respiratory protective equipment must be worn in the area. Several workers were not wearing respirators at the time the samples were taken. Although water hoses were used to wet the insulation before and during removal, some insulators were working ahead of the water hoses and stirring up clouds of dust. Wetting with water significantly reduces emission of airborne dust when properly used. - The above air samples were sampled and analyzed by phasecontrast microscopy using Union Carbide Corporation, Chemicals and Plastics Industrial Hygiene Handbook Method Number 38C-29X4-Rla. This method is identical to the procedures used by NIOSH, the organization responsible for developing methods specified by OSHA. If we can provide additional assistance, please contact us. WFBJr/rnac Attachment UCC 000396 ( SAMPLING TIME CONCENTRATION DATEEMPLOYEE(MINUTES)FIBERS/CC 08/15/77 1032 - 1115 (43) 2.59 08/15/77 1033 - 1115 (42) 2.61 08/15/77 Area Sample 1045 - 1118 (33) 0.48 TWA FIBERS/CC 2.59 2.61 i, ..r**1-'1! / / UCC 000397