Document JJ2Re318b5MoXZkNV26a88pNX

iName) vior> *ti`on y to Mr. D. H. Cook Trlr. 5583 (511) Mr. G. F. Hurley Mr. R. F. Painter Mr. H. L. Robinson Mr. E. C. Shipley Date May 25, 1979 Originating Dept, Technical Center IH/EP Subject Asbestos - Stripping Old Insulation PROJECT Survey for asbestos exposure of insulators stripping insula tion from still column in Building 707. DATE OF SURVEY May 15, 1979 SUMMARY Exposures were higher than expected for this demolition job, 2.2 and 0.9 fibers/cc TWA for Finney and Miller respectively. The fact that they were wearing respirators allowed the normal standard without protection of 2 fibers/cc TWA to be extended ten times when employees are protected during demolition or removal of material containing asbestos. This exception only pertains to work situations where it is not feasible to control dust with engineering controls. DISCUSSION Construction insulators were asked to remove insulation from BS-62 in Cell-11 of Building 707. This still column extends through three levels of the cell and is approximately eight inches in diameter. The insulation was wet down with water as much as possible and every precaution to reduce asbestos exposure to employees was followed. These precautions include; approved dis posable dust respirators, coveralls, gloves and bagging and labeling of stripped insulation for landfill. UCC 024351 - Mr.. D. H. Cook 2 5/25/79 The Technical Center Industrial Hygiene group sampled the insulators in the morning of the fifteenth and for a portion of the stripping job in the afternoon. From the data collected, we were able to determine the time-weighted average of asbestos exposure for Mr. Charles Miller and Mr. M. Finney. (See following results.) RECOMMENDATION The best control for asbestos exposure is wetting the material down before demolition starts and to follow the outline prescribed in the Construction Department Safety Procedure Manual, Section VIII, Procedure 22. We would like to emphasize the importance of this procedure and especially the instructions found in paragraph three. RESULTS Date 5/15/79 5/15/79 5/15/79 5/15/79 Personnel M. Finney M. Finney C. Miller C. Miller Time 0950-1115 1300-1400 0950-1115 1300-1400 Liters of Air 170 120 170 120 Exposure, Fibers/cc >5 pm TWA 4.6] .< 6 l] ------j> 2.2 2.0l < 2.lJ ------> 0.9 REFERENCES Volume 38C-29X4-Rla Asbestos, Dust Determination By Membrane Filter Technique Using Phase Contrast Microscopy REPORT PREPARED BY G. W. Bott Technical Center Industrial Hygiene Department APPROVED BY G/ F. Hurley y UCC 024352