Document 7O54vpjOYEEy2Y3MZyEMREY0j

Shell Oil Company Shell Chemical Company Interoffice Memorandum JUNE 29, 1987 FROM: J.E. BARTON, INDUSTRIAL HYGIENE ASSISTANT, HEALTH & SAFETY DEER PARK MANUFACTURING COMPLEX TO: J.W. OVERMAN, PROCESS MANAGER CAT CRACKING & GAS DEER PARK MANUFACTURING COMPLEX SUBJECT: MONITORING RESULTS FOR INORGANIC LEAD AND HEXAVALENT CHROMIUM DURING ABRASIVE BLASTING AT CC&G Attached are Industrial Hygiene monitoring results for total dust, inorganic lead and hexavalent chromium which were collected downwind of the abrasive blasting at the Cat Cracker and Gas Fractionator Units. The sampling results may be compared to the following exposure guidelines: Eight-hour time-weighted average Inorganic Lead Hexavalent Chromium Total Dust 0.05 mg/m3 0.05 mg/m3 10.0 mg/m3 One personnel sample wascollected on the CCU Compressor Operator to evaluate exposure potential to personnel working in the vicinity of the abrasive blasting area. The compressor operator was monitored because it was primarily the compressor area being affected by the abrasive blasting at this time. All of the area samples were positioned within 1-5 feet of the barricade tape which identified the abrasive blasting area. All of the area sampling results received to date are below the exposure guidelines for inorganic lead, hexavalent chromium and total dust. The results of both area and personnel monitoring should be posted in an aria accessible to the personnel who work in the Cat Cracking and Gas Fractionator areas. Your cooperation with Industrial Hygiene in establishing and following requirements relative to the abrasive blasting is appreciated. If you have any questions regarding these monitoring results please call me at 7342. ^^J.E. Barton Attachment CHBT8718104 LAM 006137 DPMC-18019 cc: W.B. Austin A.F. Schmit P.M. Spicer T.A. Roberts R. 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