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DOW CHEMICAL U.S.A. Building B-101, Phone 5037 TEXAS OPERATIONS FREEPORT. TEXAS T7S41 P. B. Jacobsen Brevard Company P. O. Box 922 Brazoria, TX 77422 FILE: B12-3062 Contractor Appendix Date: August 19, 1988 EVALUATION OF ASBESTOS LEVELS DURING REMOVAL IN THE APB AIR HANDLER ROOMS Brevard Company employees have been included in an Industrial Hygiene Survey conducted by Dow Texas Operations Industrial Hygiene Department. The results of this survey as it pertains to your employees is attached. It is your responsibility to inform your employees of the monitoring results along with the conclusions and recommendations. If you are not the correct person to receive this information, or if the address is incorrect, please contact Dee Barrow, telephone number 238-1281. Industrial Hygiene Services Texas Operations ST00I5258 THIS REPORT IS RESTRICTED FOR USE WITH DOW CHEMICAL U.S.A. AND BREVARD COMPANY. AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY ==QuaJltv=i INDUSTRIAL HYGIENE REPORT TEXAS OPERATIONS DOW CHEMICAL USA AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY FILE NUMBER: DATE ISSUED: PLANT CODE: B12-3062 August iy, iaa 01205 TITLE: ASBESTOS MONITORING DURING REMOVAL AT A. P. BEUTEL BUILDING, MAJOR UNIT DEMOLITION, APB AUTHOR(S) L. F. Bullard REVIEWERS) D. D. Hicks y 1 O^ungj ^4rthaJ _______ Pf^alsg. SUMMARY Asbestos monitoring was done during the removal of asbestos containing insulation from some piping associated with the air handlers in the mechanical rooms at the A. P. Beutel Building (APB). Area concentrations were less than the acceptable exposure limit of 2 fibers/cc. Potential contractor time-weighted average (TWA) exposures could not be calculated because one filter was overloaded with aust and fibers and one filter was tom during monitoring. All personnel within the restricted area used respiratory protection and disposable coveralls. The results of this survey have been furnished to Brevard Company, the contractor for this job. to --H CD CD cn ro cn to H. G. Ahlich, B-1053 *J. T. Barton, APB C. K. Browdy, M. D., B-101 *P. L. Cole, APB D. E. Cragar, B-101 C. E. Ford, APB D. H. Parish, APB Cover Sheet Only G. W. Engdahl, 1803, Midland *J. E. Lebeau, 1803, Midland *L. W. Rampy, 1803, Midland M. G. Swank, 1803, Midland RESTRICTED FOR USE WITHIN THE DOW CHEMICAL COMPANY ONLY File #B12-3062 INTRODUCTION Asbestos monitoring was performed during the removal of asbestos containing insulation from pipes associated with the air handlers at APB on January 3, 1987. Personal breathing zone samples and area samples were collected to determine potential exposures to asbestos and potential contamination of the area after the job was completed. The asbestos removal was done by Brevard Company and the monitoring was done by Donna Hicks, Joe Emmitte and Linda Bullard. CONCLUSIONS AND RECOMMENDATIONS Potential contractor eight-hour TWA exposures to asbestos could not be calculated because one sample was overloaded with dust and fibers and one filter was torn during monitoring. However, the four-hour samples collected were 0.11 and 0.12 fibers/cc. At the time of the survey, the Industrial Hygiene Guide was 2 fibers/cc. Area concentrations of asbestos before and during the removal operation ranged from less than 0.01 to 0.09 fibers/cc. All area measurements taken after the removal showed no significant airborne concentrations (<0.01 fibers/cc). Brevard Company, the contractor for this job has been furnished with the results of this survey. RESULTS AND DISCUSSION Table I shows the results of the personnel and area monitoring. Personal exposures were considered potential exposures since respiratory protection and disposable coveralls were used during the asbestos removal. All monitoring results were below the acceptable guideline for airborne asbestos of 2 fibers/cc. METHODOLOGY Asbestos samples were collected using calibrated Gilian HFS 113A and 513A air sampling pumps. A known volume of air was pulled through 25mm cellulose ester membrane filters, 0.8um pore size. Samples were collected at a flow rate of approximately 2 liters per minute. The samples were counted by McKee Environmental Health Services using phase contrast microscopy. NIOSH Method 7400 was used. EVALUATION CRITERIA The evaluation of exposure levels was based on the following criterion: Asbestos OSHA PEL 2 fibers/cc The OSHA Permissible Exposure Limit (PEL) is the time-weighted average concentration for a normal 8-hour workday, 40-hour work week, to which nearly all workers may be repeatedly exposed without adverse health effects. ST00I5260 2