Document jKqr5MjO6Gk5Rxq0zx2QdR22

SAF-.||MP Houston, Texas July 21, 1982 SAF STUDIES, SURVEYS & REPORTS Texaco USA Amarillo Plant Asbestos Mr. E. A. Enloe Amarillo, Texas Please find attached a survey report for potential exposure to asbestos at the Amarillo Plant. Both breathing zone and area samples were collected by Mr. B. R. Melton, May 17 June 8, 1982. Breathing zone samples represent potential employe exposure to asbestos during stripping from overhead lines and are within acceptable limits. Area samples were obtained in the vicinity of the atmospheric tower (DCU) following an earlier stripping operation and during the CPS/DCU/CRU down period. These samples indicate that residual asbestos contamination levels are well within the OSHA standard. The current use of respiratory protection and disposable coveralls and the practice of wetting insulation before and during removal are providing effective control for exposure and residual contamination as indicated by this survey. If there are any questions, or assistance is needed, please contact Mr. J. W. Nisbet of this office. JWN blh:B/y Signed; 0. RIGDON 0. W. RIGDON J!i23'82 WA-TEX 006134 WA-TEX006134 t AMARILLO PLANT ASBESTOS SURVEY MAY 17 - JUNE 8, 1982 Sampling by: Report by: Mr. B. L. Melton Industrial Hygiene Technician Texaco USA Mr. J. W. Nisbet Industrial Hygienist RESD I. SUMMARY Air sampling to determine potential employe exposure to asbestos was conducted at the Amarillo Plant. Breathing zone samples were obtained when an insulator was removing asbestos insulation from overhead lines for maintenance purposes. Area samples were obtained in the vicinity of the atmospheric tower (DCU) immediately following a stripping operation. All potential employe exposures were "within the respective OSHA standards. Analysis of insulation material removed during^the stripping operation showed that it contained 35-45% amosite and 5-10% chry.sotile type asbestos. The current practice of following work procedures and utilizing personal protective equipment helps to ensure that exposure during the task and residual contamination are l properly controlled. These practices are especially important since amosite is considered a more hazardous form of asbestos compared with the other forms of the material typically found. II. SAMPLING METHODS AND ANALYSIS Both breathing zone and area samples were obtained on three-stage mixed cellulose ester fiber filters utilizing a calibrated Bendix-44 sample pump. Subsequent analysis was performed on phase contrast miscroscopy by the NATLSCO Environmental Sciences Laboratory, an accredited industrial hygiene facility. Bulk samples were analyzed by polarizing light microscopy. WA-TEX 006135 WA-TEX006135 I III. RESULTS AMD DISCUSSION Results are provided in the attached Tables I and II. The breathing zone samples indicate potential ceiling limit exposures from 0.51 to 4.3 fibers per cubic centimeter (f/cc). Area samples indicate asbestos concentrations of less than 0.01 to 0.03 f/cc based on an eight-hour time weighted average (TWA). The "less than" indicates a concentration below the limit of detection. The OSHA standard for asbestos specifies an eight-hour TWA of 2 f/cc and a ceiling limit of 10 f/cc.. Breathing zone samples indicate potential exposure to' insulators below this standard. The ceiling limit levels determined here are considered "potential" exposures since insulators wore approved re'spiratory protection while performing the task. Area samples indicate no significant residual airborne asbestos following the stripping operation. Bulk sample analysis of insulation indicated significant amounts of amosite type asbestos. Importantly, the ACGIH recommends an eight-hour TWA specific for amosite of 0.5 f/cc, considerably lower than the OSHA standard referenced above for all forms of asbestos. The ACGIH standard for amosite is based on the increased carcinogenic potential related to this specific substance. This standard should also be used for exposure comparisons wher^ amosite is suspected, or determined to be, a component in stripped insulation materials. IV. RECOMMENDATIONS I The continued use of work procedures and personal protection during insulation stripping is important and should be periodically reemphasized with employes. Work procedures are especially important due to the'amount of amosite asbestos recently determined in several Amarillo Plant Insulation materials i Work procedures include the thorough wetting of insulation prior to and during removal and the disposal of asbestos-related material In properly identified and sealed bags. Personal protection includes the use of approved respiratory protection and disposable coveralls during the stripping task. While this task is typically of short duration and performed infrequently, contamination can remain and result in subsequent exposure. It, therefore, necessitates the continued adherence to the procedures and use of the protection WA-TEX 006136 WA-TEX006136 i -3- f- described above to ensure that exposures remain within acceptable limits. s Additionally, it is important that we maintain the current medical surveillance program for insulators. Annual physicals with particular attention to the lung, combined with pulmonary function tests, are the main requirements of this program. WA-TEX 006137 WA-TEX006137 CO *-- exl CO dr o o. Ui <M ce o r=> *~ z -j >UJ s> D. z> CO fr-- co z tu <T -* o<tn_ * U. uj ou.-- -Q H* UI . a: -UtUO mesa. <<XLU -a. a: --xoce '. 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