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13 <br /> 7 2 Pilot Test MonitDring and Analytical Results <br /> Data collected during the pilot testing of SVE Wells W-1, W-2, and W-4 are presented <br /> in Table 3 and include the influent pressures, influent temperatures, air flow rates, <br /> background VOC air concentrations, influent air stream concentrations, effluent <br /> concentrations, and field notes Data was recorded at five-minute intervals for the <br /> 30-minute duration of the test The data indicates that the SVE system was operating <br /> under normal conditions and that breakthrough of the GAC did not occur during the <br /> tests <br /> In general, effluent VOC concentrations were within an order of magnitude of <br /> background VOC concentration A grab sample of the influent air stream was <br /> collected in a TedlarTm bag at the end of each test to determine the actual TPH-G and <br /> BTEX concentrations in the soil vapor The samples were placed in a cooler with blue <br /> ice and transported with chain-of-custody to Clayton Environmental Laboratory in <br /> Pleasanton, California Upon arrival at the laboratory, the samples were analyzed for <br /> TPH-G and BTEX by EPA Methods 8015 modified and 8020 modified, respectively <br /> The laboratory results indicate the presence of TPH-G and BTEX vapors in samples <br /> collected from each of the wells Table 4 provides a summary of the laboratory <br /> results, while laboratory reports are included as Appendix E The highest <br /> concentrations of TPH-G (18,000 ppm), ethylbenzene (170 ppm), and total xylenes <br /> (570 ppm) were detected in the sample collected from Well W-2 Toluene was <br /> indicated at concentrations as high as at 260 ppm in the sample collected from W-4 <br /> Benzene was indicated at 53 ppm in samples from W-2 and W-4 <br /> PLOW 591 634yREPORTSSSITE ASSWfANTECAWIANTECA RPT 1Apr 26 931 CanoweEnvironmental <br />