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I22 July 2002 <br /> • AGE-NC Project No 99-0592 <br /> Page 3 of 4 <br /> detected in sample MW-1 at concentrations of 2 1 µg/1,0 81 µg/l, 10 pg/1 and 2 7 µg11,respectively, <br /> and the fuel additives MTBE, TAME and 1,2-DCA were detected at concentrations of 73 µg/1, <br /> 2 4µg11 and 14 µg/1, respectively <br /> None of the target analytes were detected in samples collected from monitoring wells MW-2,MW-3 <br /> and MW-4 and the active domestic well DW-1 =" <br /> Analytical resuj�s for the ground water samples for the June 2002 monitoring event are summarized <br /> on Tables 3 and 4 The laboratory report(MAI Lab IDs 0206152-001 through 0206152.005),QA/QC <br /> and chain-of-custody are included in Appendix B i <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE concludes <br /> • Ground water at the site was Inferred to be flowing toward the northeast at an average <br /> gradient of 0 0001 ft/ft, although at such a low gradient small measurement errors can <br /> . significantly affect the inferred flow direction <br /> • Various petroleum hydrocarbon constituents were detected in the ground water sample <br /> collected from monitoring well MW-1, including TPH-g, TPH-d, benzene, toluene, <br /> Eethylbenzene, total xylenes, MTBE, TAME and 1,2-DCA The detected concentrations of <br /> benzene, MTBE and 1,2-DCA exceed the respective DHS Maximum Contaminant Levels <br /> I (MCLs) <br /> • The fuel oxygenate TAME had not been detected at the site prior to the June 2002 / <br /> monitoring event <br /> IPetroleum hydrocarbon-impacted ground water appears to be limited to the area near <br /> monitoring well MW-1 None of the target analytes were detected in samples collected from <br />' MW-2,MW-3, MW-4 and DW-1 <br /> 5.0. RECOMMENDATIONS <br />' Based on the findings of this and previous Investigations, AGE recommends continued quarterly <br /> monitoring of ground water monitoring wells MW-1 through MW-4 and the on-site domestic well <br /> DW-1 The next monitoring event is scheduled for September 2002 With favorable results from the <br /> next monitoring event, it may be appropriate to review the site for closure considerations <br /> IAdvanced GeoEnvironmental,Inc <br />