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completed, each pump was re -calibrated to determine the post-test value. The pretest and <br />post-test values were averaged over the total sample time to calculate an average value <br />that was used to calculate a total volume for each sample cassette. <br />After sampling, the sample cassettes were removed from the sample pumps and labeled, <br />packaged, sealed, and stored in a secure location. The following day, all samples were <br />shipped to ATEML for analysis. A completed chain -of -custody form, detailing the <br />sample I.D. numbers, date and time collected, analysis requested, and other project <br />information accompanied the samples to the laboratory is included with the laboratory <br />analytical results in Appendix B. Each sample was analyzed for asbestos by NIOSH <br />Method 7402 (Revision #1) using transmission electron microscopy. <br />Field monitoring of meteorological data was recorded electronically at the Stockton <br />Airport weather station. During the sampling event on May 4, 2012, the average <br />temperature was 63 degrees with a high of 72 degrees and a low of 53 degrees. The <br />average wind speed was 7 miles per hour (mph) out of the west-northwest with gusts up <br />to 25 mph and the average relative humidity was 63%. <br />The analytical results reported by ATEML for the asbestos samples are presented in <br />Appendix B. Using fiber dimensions reported in the ATEML report, the estimated fiber <br />Alik <br />volume of asbestos is 0.3125 cubic micrometers per fiber ( 3/fiber). Assuming a <br />specific gravity of 3 for asbestos, the concentration of asbestos were calculated for each <br />sample and are presented in the table below. See Appendix A for an example calculation. <br />Summary of Asbestos Concentrations <br />Forward Landfill <br />Sample Station <br />Average Flow <br />Rate <br />(liters/minute) <br />Sample <br />Volume <br />(liters) <br />Asbestos <br />Concentration <br />(fibers/cm3AO <br />Calculated Asbestos <br />Concentration <br />(119AA/M3Air) <br />A (upwind) <br />1.49 <br />849 <br /><0.0012 <br /><0.00I I <br />B (downwind) <br />1.52 <br />856 <br />0.0036 <br />0.0034 <br />C (downwind) <br />1.51 <br />849 <br /><0.0012 <br /><0.0011 <br />D (downwind) <br />1.51 <br />853 <br /><0.0012 <br /><0.00I I <br />E (downwind/duplicate) <br />1.52 <br />874 <br />0.0012 <br />0.0011 <br />Notes: ltg — Microgram <br />Asb. —Asbestos <br />m3. — Cubic Meter <br />cm3 — Cubic Centimeter <br />As presented in the table above, asbestos was detected at low concentrations in the <br />samples collected from sample stations B and E. However, the calculated asbestos <br />concentrations were well below the threshold value (action level) established for asbestos <br />(5.0011 µg/m3Air)• <br />-2- Geo -Logic Associates <br />