Document 6wnpdwD1mO35mOnR2EV9KRmdm

fLAMSlUft'S LXHiBIT INDUSTRIAL HYGIENE REPORT DOW-836 TEXAS OPERATIONS DOW CHEMICAL USA AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY FILE NUMBER: DATE ISSUED: PLANT CODE: FEBRUARY 10, 1989 - 00G - ----------- TITLE: EVALUATION OF CONTRACTOR WORK PROCEDURES DURING A TRANSITE REMOVAL PROJECT AT MAGNESIUM I Personal and area monitoring was performed during the removal of asbestos transite at Magnesium I on December 14 and 15, 1988. All personal and area sample results were below the acceptable exposure guidelines of 0.2 flbers/cc. Results of the five samples taken ranged from 0.002 to 0.082 flbers/cc with an average of 0.037 fibers/cc. The procedures outlined In the Texas Operations Asbestos Handbook - November, 1988 were followed during this removal project by Win Way contractors. The work area was cordoned off and all workers within the restricted area used approved respiratory protection and protective clothing. Disposal and clean up operations followed the handbook guidelines. cn --i o CD DISTRIBUTION: cn co CO cn D. E. Cragar, 8-101 W. Demain, 8-101 G. W. Engdahi, 1803, Midland C. L. Lee, A-650 L. D. Knox, A-650 J. E. Allen, A-642 G. Ruhmann, A-651 *J. E. LeBeau, 1803, Midland *L. W. Rampy, 1803, Midland M. G. Swank, 1803, Midland Cover sheet only RESTRICTED FOR USE WITHIN THE DOW CHEMICAL COMPANY ONLY 1HS FILE IA6-3445 - Page I EVALUATION OF CONTRACTOR WORK PROCEDURE DURING A TRANSITE REMOVAL PROJECT AT MAGNESIUM I ST00I5397 INTRODUCTION On December 14 and 15, 1988, Win Way contractors removed transite board from Magnesium I celling. Personal and area monitoring was conducted to evaluate potential exposures to asbestos during this operation. CONCLUSION All personal and area sample results were below acceptable exposure guidelines of 0.2 flbers/cc. Results of the five samples taken ranged from 0.002 to 0.082 fibers/cc with an average of 0.037 fibers/cc. Monitoring results have been communicated to Win Way contractors for employee notification. See Table I for sample results. RESULTS AND DISCUSSION All procedures in the Texas Operations Asbestos Handbook - November 1988 were followed when Win Way contractors removed transite board from Magnesium I's celling. The actual removal process lasted two days and occurred on December 14 and 15, 1988. A sizzors lift was utilized to perform this removal project. A double layer of clear poly was laid out on the decking and attached to the sizzor lift's midrail. Prior to removal, each transite board was wetted with amended water. Once removed the transite was placed on a double layer of polyethylene, wrapped and secured. This wrapped transite was then placed in a dino box for disposal. The polyethylene on the lift was rolled up and properly disposed of and the work area was thoroughly cleaned. Approved respirators and protective clothing were worn by all operators involved within this restricted area. METHODOLOGY Asbestos samples were collected using Gil Ian HFS513 air sampling pumps. A known volume of air was pulled through 25mm cellulose ester membrane filters, 0.8 micron pore size. Samples were collected at a flow rate of approximately two liters per minute. The samples were counted by McKee Environmental Health Services using NI0SH Analytical Method #7400. EVALUATION CRITERIA The evaluation of exposure levels were based on the following criterion. Asbestos ________ OSHA PEL 0.2 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 affects. !HS FILE #A6-3445 TABLE I ASBESTOS TRANSITE REMOVAL BY WIN HAY CONTRACTORS MAGNESIUM I Samole # Location/SS# Date Sample Time (min) During Sampling 8-Hour Asbestos Average fibers/cc Asbestos fibers/cc #1AR *2AR *3AR #4AR r6AR 455-37-8995 12-14-88 330-54-1321 12-14-88 6' from hoist 12-14-88 on ground floor 330-54-1321 12-15-88 455-37-8995 12-15-88 161 158 159 61 61 0.082 0.073 0.027 0.002 0.002 0.027 0.024 0.008 0.0002 0.0002 ST00I5398