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20 Asbestos Sampling Procedure <br /> Sampling Procedures followed the National Institute for Occupational Safe hand Health <br /> (NIOSH)ASBESTOS by TEM: METHOD 7402 (reference method, Appendix A of the Air <br /> Monitoring Plan). Each sampling station consisted of a sampling pump (with a built-in <br /> rotameter), filter cassette, connective tubing, mounting materials, and a flag(Figure 3). The <br /> filters used in this procedure had 0.45 micrometers (pm) mixed cellulose ester membranes, <br /> 25 millimeter diameters, and were encased in conductive cassettes. The sampling pumps used in <br /> this procedure were GilAir-5 Constant Flow Air Sampling Pumps with a flow capacity of 1 to 5 <br /> liters per minute(L/min). The built-in calibrators on the GilAir-5 pumps were not accurate <br /> enough for sampling requirements. Therefore a bubble meter calibrator was used to determine <br /> calibrated values for each pump. The calibrator could then offer a"real"pretest value and <br /> provide a basis for determining a"calibrated" value on each individual pump rotameter. As <br /> directed in the reference method and assuming an insignificant amount of non-asbestos dust, <br /> each pump was calibrated to a volumetric air flow rate of 2 L/min before the sampling period. <br /> Sampling was conducted on October 1, 2008 and completed within one day. The field data are <br /> presented in Appendix B. During the eight-hour sampling period, Shaw personnel visually <br /> checked the sampling pumps on an hourly basis for fluctuations in the flow rate and corrected <br /> and recorded any deviations of more than 5 percent from the initial value. After sampling was <br /> completed, each pump was retested with the calibrator to find a"real"post-test value. The <br /> pretest and post-test values were averaged over the total sample time, and the average value was <br /> used to calculate a total volume for each sample cassette. <br /> All samples were packaged, sealed, labeled, and stored in secured locations per the reference <br /> method. The samples were then shipped to the approved analytical laboratory the following <br /> business day. <br /> i <br /> S -Shaw ErMrmnentai,Inc. 2.1 <br />