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+ Illl <br /> �9 <br />' 26 May 2004 <br /> AGE-NC Project No 99-0637 <br /> Page 3 of 4 <br /> No other analytes were detected at or above laboratory reporting limits in the ground water samples <br /> The analytical results of ground water samples are summarized on Tables 2 and 3 The laboratory <br /> report(MAI Lab Work Order No 0402253), QA/QC report and chain-of-custody form are included <br /> in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> • The ground water elevations ranged from 13 90 feet to 14 56 feet above MSL Ground water <br /> flow was inferred to be flowing toward the north-northwest,away from the former UST area <br /> at an average gradient of 0 005 feet/feet <br /> • TPH-g, TPH-d, BTEX and fuel additives, with the exception of MTBE, were not detected <br /> in any of the ground water samples collected from the site <br /> • MTBE was detected In the ground water samples collected from wells MW 1,MW2, MW4, <br /> MW5, MW6, MW9 and MW 10 MTBE was detected for the first time in the past four <br /> sampling events in well MW2, MTBE was not detected in well MW-7 this quarter, MTBE <br /> concentrations detected in wells MW9 and MW 10 were the highest they have been over the <br /> past five sampling events <br /> IThe lateral extent of MTBE-impacted ground water has been defined in all directions except <br /> towards the northwest beyond wells MW9 and MW 10 <br /> 5.0. RECOMMENDATIONS <br /> IBased on the findings of this investigation, AGE recommends <br /> I Continuation of the quarterly ground water monitoring program The next monitoring event <br /> should be performed in May 2004 <br /> • Installation of ozone wells as proposed in the AGE-prepared, Ozone Infection Pilot Study <br /> Work Plan, dated 05 March 2004 Ozone wells were installed at the site on 13 and 14 May <br /> 2004 <br /> Advanced CeoEnvlronmental,Inc <br /> I <br />