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06 January 2006 <br /> AGE-NC Project No 99-0637 <br /> Page 3 of 4 <br />' 33 OZONE INJECTION PILOT TEST <br /> Ozone infection began at the site on 31 August 2004 Currently the ozone system infects ozone for <br />' a 1 hour duration into one ozone infection point at a time After completing a cycle through the nine <br /> ozone wells, the ozone injection ceases for lhour prior to beginning the next cycle The injection <br /> pressure is approximately 8 to 10 pound per square inch(psi)and the rate is less than 18 stand cubic <br />' feet hour Ozone remediation field data is presented in Table 4 <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br />' 0 The ground water elevations ranged from 14 55 feet to 14 99 feet above MSL Ground water <br /> flow was inferred to be flowing generally toward the southwest, away from the former UST <br />' area at an average gradient of 0 003 ft/ft <br /> • MTBE was detected in the sample collected from well MW-4 at a concentration of 30 µg/l <br /> MTBE was not detected in the samples collected from the remaining wells for the second <br /> consecutive quarter <br /> • No other fuel additives were detected in the August 2005 ground water samples <br /> 1 <br />' 5.0. RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends <br /> • Continuation of the quarterly ground water monitoring program The fourth quarter <br /> monitoring event is scheduled for November 2005 <br /> r0 Continuation of ozone injection remediation as directed by San Joaquin County EHD letter <br /> dated, 27 September 2005 <br /> Advanced GeoEnvironmental,Inc <br /> I <br />