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10 flow rates were measured using a hot wire anemometer and a digital readout with an electromechanical totalizer The vapor concentrations in the influent and effluent air stream were quantified using a PID equipped with a probe to detect VOCs The air quality in the exhaust stack was monitored closely for breakthrough of the GAC vessels 6 2 Pilot Test Monitoring and Analytical Results Data collected during the pilot testing of SVE Wells W-1 , W-2, and W-3 are presented in Table 3 and include the influent pressures, influent temperatures, air flow rates, jbackground VOC air concentrations, influent air stream concentrations, effluent concentrations, and field notes Data was recorded at five-minute intervals for the duration of the tests The data indicates that the SVE system was operating under normal conditions During the final test of the Site, at Well W-1 , monitoring indicated that chemical breakthrough of the GAC vessel had occurred after 25 minutes of operation The SVE system was shut down immediately after the breakthrough was detected In general, effluent VOCs were within an order of magnitude of background VOC contaminants, as indicated by the PID It should be noted that the PID does not detect VOCs in the TPH-G range Appendix F provides plots of the background, effluent, and influent concentrations over the time of the tests A grab sample of the influent air stream was collected in TedlarT"" bags at the end of each test to determine the actual TPH-G and BTEX concentrations in the soil vapor The samples were placed in a cooler with blue ice and transported to Clayton Environmental Laboratory in Pleasanton, California, for analysis under a proper chain- of-custody Upon arrival at the laboratory, the samples were analyzed for TPH-G and BTEX by EPA Methods 8015 modified and 8020 modified, respectively W 191 634 REPORTSISITE ASSILOCKEFORMLOCKEFORO RPT Ap,d 26 19931 Canonlel 3 L m 1 on n it-1 td 1