Document 50rv7bVJEgbOGZwbnBajGq0Be

I* May 29, 1992 Dow U.S.A The Dow Chemical Comcany P 0 Box ' 50 Piaquemihe Louisiana 70765-0150 Daniel Cortez Eddie Guillory Petrin Petrin cc: Rodney Bordelon Building 4106 Methanes 4601 Asbestos Monitoring Enclosed are sample results for potential exposure to asbestos. The OSHA 8-hour permissible exposure limit for asbestos is 0.2 f/cc >5 microns and the 30-minute short term exposure limit is 1 f/cc >5 microns. The results displayed are based on sampling duration. The data sheet shows the results of exposure using two methods, the Limit of Detection (LOD) and the Limit of Quantitation (LOQ). Included on the data sheet is an explanation of the method Limit of Quantitation. Thank you, Darlene S. Creel Industrial Hygiene Ext. 6181 Building 3502-E Attachment dsc ASBESTOS MONITORING DATA RESULTS; METHANES 1992 **LOD **'LOQ EXPOSURE GUIDELINES 8-HR. TWA LIMIT - 0.20 FIB/CC 30-MINUTE LIMIT = 1.0 FIB/CC LIMIT OF DETECTION = 7 FIB/MM2 LIMIT OF QUANTITATION = 100 FIB/MM2 DATE SAMPLE * PERSONNEL DESCRIPTION 5/20/92 12452 *435-06-2532 Insulator: Removing ACM from 10* condensate line running East/West from distillation. WET METHOD USED 5/20/92 13468 *433-19-2653 Insulator: Removing ACM from 10" condensate line running East/West from distillation. WET METHOD USED. DURCMIN) 30 YQL(L) 75 "LOD FIB/CC <0.01 ***LOQ FIB/CC <0.51 30 75 0.31 <0.51 * The proper protective clothing was worn during the job. North 7700 Respirator with HEPA filters were worn during the job. Note: The Limit of Quantitation has been defined as 100 Fibers/MM2 using the minimum fiber loading criteria specified. In die NIOSH analytical method 7400, the staled range of the method is 100 to 1300 Fibers/MM2 filter area. Although samples below this range can be analyzed, the method has not been validated below 100 Fibers/MM2. However, the NIOSH method 7400 also establishes the estimated Limit of Detection as 7 Fibers/MM2 {Reference OSHA Std. 1910.1001, Appendix B). Based on this information, we will establish 100 Fibers/MM2 filter area as our Limit of Quantitation and 7 Fibers/MM2 filter area as our Limit of Detection (which is more representative of the actual fibers present} for asbestos monitoring. We will report both Limit of Quantitation and Limit of Detection. If only Umit of Quantitation were expressed, the minimum reportable result would calculate to be 0.04 Fibers per cc for an 8-hr. Time weighted average sample at a flow rate of 2 liters per minute and 0.6 fibers per cc for a 30 minute time weighted average short term sample at a flow rate of 2 liters per minute. 00 A ]14790 .`-.I JO T l>OI4T T AL