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I01 February 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 0311234),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 11 02 feet to 11 49 feet above MSL Ground water <br /> flow was inferred to be flowing toward the west-northwest, away from the former UST area <br /> at an average gradient of 0 004 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,MW4 through <br /> MW-7 and MW9 at concentrations ranging from 0 74µg/1 in well MW7 to 980µg/1 Overall, <br /> concentrations of MTBE decreased in wells MW4 and MW9,but increased in wells MW 1 <br /> and MW-5 since the last monitoring event in August 2003,MTBE also was detected for the <br /> first time in well MW-7 <br />' The lateral extent of MTBE-impacted ground water has generally been defined in all <br /> directions <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends <br />' • Continuation of the quarterly ground water monitoring program The next monitoring event <br /> should be performed in February 2004 <br /> • Preparation of a remedial action work plan as directed by San Joaquin County EHD letter <br />' dated, 07 January 2004 <br /> i <br /> Advanced GeoEnvironmental,Inc <br />