Document ZJ5jg8eekevK9dadygwKxDev8

. *r ! . .* CHMiCAL3 AMD ?IA57!C3 INSMfUfE PLAN! I'. (). MIX CHARLESTON, WES)' VIRGINIA 253.'. rn (Namcj ijlVlSlOll Local..... Mr. D. D. Miller Building 8349 Institute Plant ....... July 21, 1978 ER-Industrial Hygiene iloyy to Mr. D. R. Morgan Mr. F. Williams Asbestos Demolition Monitoring Results - Tank 4621______________ irTJ-A: ?"OMf*TLY CONVEY M S'lTf'i.'TV'r; *JLT*I : O <5 Employees of Allied Insulating Service were involved in the removal of asbestos containing insulation from Tank 4621 during July 10 and 11 of this year. The material was old block KAYLO which was partially water saturated from breaks in the protective cover and the employees used reasonable care in wetting the sidewall material prior to the removal process. This job was generally performed according to the prescribed standards in that adequate wetting was ensured, signs were in place, area was marked with barricade tape and the employees wore 3M dust respirators. The current threshold limit value (TLV) for asbestos is 2 fibers per ml of air and when proper care is not taken the TLV will most likely be exceeded. The following data indicates the amount of fibers which were airborne and subject to being inhaled had the employees not worn respirators. Although they would not have been overexposed they should be encouraged to wear the respirators under these conditions because in addition to asbestos fibers there were also glass wool and other unidentified particulates. Date Name/Type Sample Fiber Count/ ml Air Comment AU4062 7/10/78 7/10/78 7/10/78 7/10/78 7/10/78 7/10/78 7/10/78 7/11/78 7/11/78 7/11/78 Area Area D. E. Taylor R. R. Horn R. R. Horn L. R. Clark Area Area T. C. Hammons R. R. Horn 2.2 SE of Tank 4621 1.7 SW of Tank 4621 1.3 Stripping blocks and cover 1.3 Stripping blocks and cover 1.1 Moving cover material to dumpster 1.2 Moving cover material to dumpster 0.1 At 6' near dumpster 0.1 6' from removal area 0.8 Shovel and removal of wet blocks 0.6 Shovel and removal of wet blocks Please call us on other occasions when large demolition jobs are in progress for inspection, even though we may not collect samples. H. H. Frazier INTERNAL CORRESPONDENCE -IEMICALS AND PLASTICS (Name) tsiofl stion y 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 Date August 25, 1977 Originating D.P.- IH/EP Subject Asbestos Monitoring at Institute FRED WILLIAMS 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. AU406 WFBJr/mac DATE 08/15/77 08/15/77 08/15/77 EMPLOYEE SAMPLING TIME (MINUTES) R. P. Williams 1032 - 1115 (43) W. G. Adkins 1033 - 1115 (42) Area Sample 1045 - 1118 (33) CONCENTRATION FIBERS/CC 2.59 2.61 0.48 TWA FIBERS/CC 2.59 2.61 --