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' 13 November 2000 <br /> AGE-NC Project No 98-0465 <br /> Page 3 of 4 <br /> ' TPH-d was detected in the ground water samples collected from monitoring well MW3 at a <br /> concentration of 90 µg/l BTEX compounds were detected in the ground water samples collected <br /> from well MW2 at concentrations of 0 56 ug/l, 0 98 ugll, 0 53 ugll and 2 6 ug/l, respectively <br /> Xylenes were detected in the samples collected from MW1, MW3 and MW4 at concentrations of <br /> 1 2 ug/l, 1 2 µg/1 and 1 5 ,ug/l, respectively <br /> ' MTBE was detected in the ground water samples collected from MW1, MW3, and MW4 at <br /> concentrations of 8 8 ug/1, 250 ug/1 and 59 ugli, respectively MTBE detections were confirmed in <br /> the samples by EPA Method 8260 at concentrations of 8 9 4g/1, 270 ug/l and 63 ug/l, respectively <br /> ' No other fuel oxygenated compounds were detected in the ground water analyses <br /> Analytical results of water samples collected during October 2000 are summarized on Table 2, The <br /> laboratory report (MAI Lab No 50882 through 50885), QA/QC report and chain-of-custody form <br /> are included in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> o The ground water elevations ranged from 8 61 to 8 70 feet below MSL Ground water is <br /> flowing toward the northwest under an average gradient of 0 0013 feet/feet The relative <br /> ground water elevation at the site decreased an average of 1 63 feet between the July 2000 <br /> ' and October 2000 monitoring events <br /> • Concentrations of dissolved TPH-d and/or BTEX compounds previously undetected, are <br /> present in monitoring wells MW I, MW2, MW3 and MW4 Concentrations of dissolved <br /> MTBE have increased significantly in monitoring wells MW3 and MW4 since the last <br /> monitoring event in July 2000 <br /> ' c The lateral extent of petroleum hydrocarbon-impacted ground water has not been defined, <br /> but does not appear to be significant <br /> ' o The lateral extent of MTBE-impacted ground water has been defined to the northeast of the <br /> former UST area, but not toward the east, south or west to northwest <br /> Advanced GeoEnvironmental,Inc <br />