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I I 13 7 2 Plot Test Monitoring and Analytical Results ' Data collected during the pilot testing of SVE Wells W-1 , W-2, and W-4 are presented in Table 3 and include the influent pressures, influent temperatures, air flow rates, ' background VOC air concentrations, influent air stream concentrations, effluent concentrations, and field notes Data was recorded at five-minute intervals for the 1 30-minute duration of the test The data indicates that the SVE system was operating ' under normal conditions and that breakthrough of the GAC did not occur during the tests ' In general, effluent VOC concentrations were within an order of magnitude of ' background VOC concentration A grab sample of the influent air stream was collected in a TedlarTm bag 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 with chain-of-custody to Clayton Environmental Laboratory in ' Pleasanton, California. Upon arrival at the laboratory, the samples were analyzed for TPH-G and BTEX by EPA Methods 8015 modified and 8020 modified, respectively I The laboratory results indicate the presence of TPH- G and BTEX vapors in samples collected from each of the wells Table 4 provides a summary of the laboratory results, while laboratory reports are included as Appendix E The highest Iconcentrations of TPH-G (18,000 ppm), ethylbenzene (170 ppm), and total xylenes (570 ppm) were detected in the sample collected from Well W-2 Toluene was Iindicated at concentrations as high as at 260 ppm in the sample collected from W-4 Benzene was indicated at 53 ppm in samples from W-2 and W-4 I PL1W 181 63A1REPORTSSSITE ASSIMANTECAWANTECA RPT 1Ap,26 931 CanonletJ T-)v i ron mental