Document 3e3gpgErb52zxX1Kd6DgapqLn

M. S. RIGGS INTEROFFICE CORRESPONDENCE date April 16, 1979 cc 4' E. R. Averill ^ P. R. Chaney // L. Levin ( W. D. Mitterlehner Cs* W. E. Sweeney ASBESTOS CONCENTRATIONS RESULTING FROM 0/A INSULATION DEMOLITION HRH-9-4/79 MOBIL CHEMICAL COMPANY PETROCHEMICALS DIVISION February 10, 11, 12, 1979 3/ - - ca '* INTRODUCTION Six general area air samples were collected on February 10, 11, 12, 1979 during contract insulation removal at the 0/A boiler preheater to determine the presence of asbestos fiber. All Rcsendahl contract personnel working in this area were supplied with approved respirators and protective j. SUMMARY Asbestos concentrations are listed below by sample number, location, and date. The OSIiA pernsissable exposure limit (PEL) for employee exposure is 2 fibers/cc. Sanole No. Date O/A-l 2/10/79 0/A-2 2/10/79 O/A-3 2/10/79 O/A-4 2/10/79 O/A-5 2/11/79 0/.A-6 2/12/79 Location/Operation S. Side of Boiler 20 Ft. Downwind Near Boiler - Little Work In Progress Near Boiler - Insulation Cleanup Near Boiler - Insulation Cleanup Near- Boiler - Insulation Cleanup S. Side of Preheater After Cleanup Total Fiber Fibers/cc 48,900 0.81 3,700 0.06 25,600 0.42 9,800 0.16 96,500 3,700 1.6 0.06 05846 447616 M. S RIGliS l>"rEROFFfCE CORRESPONDENCE 2- - 4/16/79 Asbestos concentrations did not exceed 2.0 fibers/cc in any sample, however, this data may not be representative of personnel exposure at the breathing-zone. RECOrefENDATION In cooperation with Rosendahl, an additional series of employee breathing-zone samples should be collected at the tine of the next scheduled removal operation. The results of this monitoring should be provided to Rosendahl as documentation of compliance with the exposure limit and initial monitoring required in the OSIIA standard. BAL:j rt B. A. Larson Industrial Hygienist 05847 447617