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04 January 2002 <br /> AGE-NC Project No 95-0137 <br /> Page 2 of 6 <br /> ' vacuum pump attached to the influent and effluent stream The samples were labeled,placed in a pre- <br /> chilled cooler and transported undei charas-of=custody to transported to McCampbell Analytical Inc <br /> (MAI)in Pacheco,California,a California Department ofHealth Services(DHS)-certified laboratory <br /> The samples were analyzed for <br /> t • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether <br /> (MTBE) in accordance with EPA Method 8020, <br /> The i esults of the laboratory analysis are summarized in Table 1 <br /> ' 2 2 SPARGE SYSTEM OPERATION AND MONITORING <br /> A compressor-based EnviroSparge IAS system was installed at the site, 08 August 2001 The <br /> comps essor was connected to the sparge wells using the previously installed one-inch diameter PVC <br /> underground pipe network The IAS system delivers 6 standard cubic feet per minute (scfm) at a <br /> pressure of 10 pounds per square inch, adequate to displace the static water within each sparge well <br /> The F <br /> EnvioS ar e IAS system began full-scale operation on 08 August 2001 The IAS system was <br /> F g g <br /> monitored and serviced over the quarter The dissolved oxygen In the ground water wells was <br /> measured i egularly during the quarter Dissolved oxygen has shown a low to moderate increase in <br /> ground water wells since the initiation of the remediation system The spargrng flow rate was adjusted <br /> to approximately 6 scfm and to a pressure of 10 psi <br /> 2 3 WELL MONITORING AND EVACUATION <br /> On 04 Octobei 2001, a Sohnst water level meter was used to measure the depth to ground water in <br /> ' gi ound water monitoring wells MW-1 through MW-5 The depths to ground water are sunmanzed <br /> in Table 2 <br /> After ground water depth measurements were recorded, a minimurn of three well casing-water <br /> volumes of ground water were purged from wells MW-1 through MW-5 All wells were purged using <br /> new, clean, disposable and dedicated plastic bailers Temperature, pH, and conductivity were <br /> measured at regular intervals using an Oakton water analyzei Purged water was stored on-site in <br /> . Advanced GeoLnvnranmental,Inc <br /> 1 <br />