Document b5ZKY2Yrgbb8Q7m2GeBOkwaq3

M? * PLAINTIFF'S EXHIBIT TEX-112 Mr. W. C. Patterson Houston, Texas In my memorandum of February 25, 1974, transmitting the report of an Industrial Hygiene Survey conducted the week of November 26,. 1973, it was stated that results of' asbestos sampling conducted during the survey would be transmitted at a later date. We regret the delay in reporting the results of this sampling, however, it was due to curcimstances beyond our control. Attached is an original and one copy of a report of .the results of asbestos sampling conducted at the Puget Sound Plant during the above dates. It is assumed that you will forward one copy to Mr. P. C.- Templeton. If you or Mr. Templeton should have any questions, please contact me at your convenience. ." HLH/dem cc: PGT.DMM-WAD-RTR H. L. HOBSON j WA-TEX 000090 I. , ~ .-*! INDUSTRIAL HYGIENE SURVEY PUGET SOUND PLANT ANACORDES, WASHINGTON November 26 - 29, 197$ By H. L. HOBSON, INDUSTRIAL HYGIENIST HEALTH DIVISION, TEXACO INC. HOUSTON, TEXAS SUMMARY An Industrial Hygiene Survey was conducted ..at the Puget Sound Plant in order to determine exposure levels of insulators handling asbestos products. Unfortunately, due to the infrequent use of asbestos insulation and the seldom occurance of asbestos insulation removal, sampling of a magnitude necessary to make a complete evaluation was not possible. The operation which was surveyed included the dry'stripping of existing asbestos insulation and the replacement of this insulation to its original location. It was determined that exposures were below current maximum allowable concentrations based on one ten minute sample. FINDINGS On November 28, 1973, breathing zone samples for .airborne asbestos fibers were collected using Mine Safety Appliances (MSA) monitare pumps, and appropriate gridded milipore filters with open face. The co-operation of Mr. Tom Scoggin was solicited in order to collect samples. Activities sampled were divided into two segments, the first of which encompassed the removal of dry preformed asbestos insulation from a horizontal pipe run, and secondly, the replacement of this same insulation on the original pipe. A summary of sampling activities and results of microscopic counting is presented in Table I. Milipore filterswere counted by two separate and independent groups; Beacon Research and Technical Laboratories, Texaco Inc., Beacon New York and the Bernville Biological Laboratory, Bernville, Pennsylvania. The results obtained by these laboratories are comparable and averages of the two counts obtained are used in calculating exposures. Regretably, filter No. 2 was lost in transit and therefore, results are not available for the second phase of the work performed,- It should be noted that the work being performed during the first part of the sampled operation would be expected to generate the highest level of airborne asbestos fibers concentration. Consequently, one would expect that should the results from sample No. 2 have been available, it would have reflected a concentration lower than that of sample No. 1. ' WA-TEX 000091' . .. -2- Because the use o asbestos insulation at Puget Sound Plant has been discontinued, and because the stripping of existing asbestos insulation is only very infrequently performed, this very brief operation, which was especially conducted for the purpose of sampling, was all that could be generated. . Sampling times of the duration in this report are satisfactory only for the evaluation of the maximum allowable concentration as established by the Occupational Safety and Health Administration Standards of ten fibers per cubic centimeter greater than five.micrometers in length. Results indicate that this type of stripping operation performed under dry conditions very nearly approaches this maximum allowable concentration but does not exceed it. It is therefore most important that whenever possible, all asbestos stripping operations be performed under wet conditions. It was not possible to evaluate an eight hour, time weighted average for comparison with the threshold limit value. The co-operation and assistance of Mr. Scoggins and Mr. P. G. Templeton and his staff are greatly appreciated. ' H. L. HOBSON i WA-TEX 000092 . s i to c g *rf s (o0 t<oj> gf *tQo c 5 * CO H too *p C0O) 8 cd 2 B s A Vi O V* O t? fan. 0) I 1& CO P|s O' < to is+> So 1-0 to d p *DrOl s Is m H *3 fe s \0 5 i iS3 CO to a> & 35 3.. fc to o 04 -* cn I E* s a tQo) f I* (0 s8 S r? 8 01 0 *t0po) eg 1 VOv4*' ) WA-TEX 000093 > * rv *