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V !F <br />' 14 January 2003 <br /> . AGE-NC Project No 95-0111 <br />' Page 3 of 4 <br /> of 1,900 µg/l and 700 µg/1,respectively, TPH-d was not analyzed in the sample collected from well <br />' MW-2 because the sample container ruptured during transport to the laboratory <br /> Toluene was detected in sample MW-2 at a concentration o£0 57 µg/1, no other BTEX compounds <br />' were detected in the samples analyzed <br /> MTBE was detected utilizing EPA method 8260 in the ground water samples collected from MW-1, <br />' MW-3, MW-4 and MW-6 through MW-8 at concentrations of between 0 57 µg/1 (MW-4) and <br /> 580 gg/1 (MW-8) No other fuel additives were detected at or above laboratory reporting limits in <br />' the ground water samples analyzed <br /> Analytical results of the ground water samples are summarized in Tables 2 and 3 The laboratory <br />' report(MAI Laboratory I D Nos 0209368-001 through 0209368-008),quality assurance and quality <br /> control report and chain-of-custody forms are included in Appendix B <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> lie <br /> Based on the findings from this investigation, AGE concludes <br /> • The northerly ground water flow direction inferred from data collected during this <br />' monitoring event is consistent with ground water flow directions determined during past <br /> monitoring events at the site <br /> • TPH-d was detected in the ground water samples collected from wells MW-4 and MW-5 at <br />' concentrations of 1,900µg/1 and 700 µg/l,respectively TPH-g was not detected at or above <br /> laboratory reporting limits in the ground water samples <br />' Toluene was present in sample MW-2 at a concentration of 0 57 µg/l,which is just above the <br /> detection limit of 0 5 pg/l <br />' • MTBE was detected by EPA Method 8260 in the samples collected from MW-1, MW-3, <br /> MW-4 and MW-6 through MW-8 The MTBE concentration in easternmost well MW-8 <br /> increased significantly, to 580 µg/l, exceeding the DHS's Primary Maximum Contaminant <br />' Level (MCL) in drinking water for the first time In addition, the MTBE concentration of <br /> 12 µg/1 in sample MW-1 exceeded the DHS' Secondary MCL in drinking water <br /> • No other fuel additives, including 1,2-DCA and EDB were detected at or above laboratory <br />' reporting limits in the ground water samples analyzed A map illustrating the approximate <br /> extent of TPH-d- and MTBE-impacted ground water is depicted on Figure 4 <br /> • Advanced GeoEnvironrnental Inc <br />