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1 <br /> Arig <br /> • June 21, 1993 Working To Restore Nature <br /> ARCO Service Station No 2130 <br /> performed on October 12 with the exception that groundwater samples were not analyzed <br /> for dissolved oxygen and soil gas samples were not collected <br /> Vadose zone pressure response and depth to ground-water measurements are summarized <br /> in Tables 1 and 2. The results of ground-water analyses for TPHg, benzene, and dissolved <br /> oxygen (DO) are summarized in Tables 3, 4, and 5 <br /> 1 <br /> Air Sparging/Vapor Extraction <br /> On October 13, 1992, RESNA conducted a combined air sparging and vapor-extraction test <br /> i <br /> to evaluate if vapor extraction is capable of capturing the off-gas (induced by air sparging) <br /> transmitted to the vadose zone. Vapor extraction during the combined air sparge/vapor- <br /> extraction test was performed utilizing an internal combustion engine, instrumentation for <br /> • measuring air flow, vacuum, air velocity, air pressure, and temperature PVC piping and <br /> fittings were connected to the existing vapor-extraction well VW-4 To create a vacuum <br /> zone that extended beyond the radius of influence of well AS-1, vapor-extraction flow rates <br /> ranging from 170 to 192 actual cubic feet per minute (acfm) were achieved Data collected <br /> 1 <br /> during the combination test were similar to data collected during the sparge-only tests <br /> Vadose zone pressure response and depth to ground-water measurements for this phase of <br /> testing are summarized in Table 6 The results of ground-water analyses for TPHg, benzene, <br /> and DO are summarized in Tables 7, 8, and 9 Results of vapor sample analyses for TPHg <br /> and benzene are summarized in Table 10 <br /> 1 <br /> Laboratory Analyses <br /> Soil gas and ground-water samples were submitted to Sequoia Analytical Laboratory Soil <br /> gas samples collected from the air sparge wells were analyzed for TPHg and benzene, <br /> 30003-5 8 <br /> N <br />