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Central Coast Analytical Services (Central Coast) of San Luis Obispo, <br /> California performed the analyses. As stated in Section 1 .0, the <br /> laboratory analyzed for VOCs using GC/MS instead of using a gas chro- <br /> matograph with electron capture and photoionization detectors as <br /> described in the Guidelines. Due to the elevated VOC concentrations <br /> in the gas samples, the laboratory had to use smaller sample volumes, <br /> thereby increasing their standard laboratory detection limits. As a <br /> result, the laboratory detection limits for ethylene dibromide and <br /> chloroform are above their respective regulatory detection limits. <br /> Analytical procedures are presented in Appendix D. <br /> 2.4.2 Integrated Surface Walk <br /> On May 25, 1988, the integrated surface sampler was used to collect a <br /> surface air sample of approximately 8 liters. The site was dry and no <br /> rain had fallen for 72 hours. The sampling probe was held approxi- <br /> mately 2 to 3 inches above the disposal site surface, and the collec- <br /> tion flow rate was set to approximately 333 cubic centimeters per <br /> minute. The actual flow rate was also recorded. A technician walked <br /> the grid continuously for 25 minutes through a course of approximately <br /> 2,600 linear feet. <br /> An anemometer and wind vane with a continuous recorder were installed <br /> at the landfill site to record wind speed and direction data. Both <br /> wind speed and direction were recorded continuously during the inte- <br /> grated surface sampling period. After the integrated surface walk <br /> area had been sampled, the wind speed data were reviewed. The wind <br /> data were evaluated and the sample was considered valid according to <br /> the criteria in the Guidelines since the average wind speed did not <br /> exceed 5 mph and instantaneous wind speed did not exceed 10 mph. <br /> Table 1 presents the integrated surface walk wind data. <br /> Immediately after collection, the bag sample was analyzed in the field <br /> with an organic vapor analyzer (OVA) for total organics measured as <br /> methane. Within 72 hours after collection, the bag sample was ana- <br /> PJ9 9390304.00D 2-3 Rev. 0 09/20/88 <br />