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' 04 June 2001 <br /> . AGE-NC Project No 98-0465 <br /> ' Page 3 of 4 <br /> ' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> Each sample was analyzed for TPH-g, TPH-d, BTEX, and for the suite of five oxygenated fuel <br /> ' additives TPH-g, TPH-d and BTEX were not detected at concentrations at or above the laboratory <br /> reporting limits in any of the ground water samples <br /> MTBE was detected in the ground water samples collected from MW 1, MW3, and MW4 at <br /> concentrations of 5 9 µg/l, 61 µg/1 and 7 4 µg/1, respectively MTBE detections were confirmed in <br /> the samples by EPA Method 8260 at concentrations of 3 3 µg/I, 69 µg11 and 5 5 µg/1, respectively <br /> ' No other fuel oxygenated compounds were detected in the ground water analyses <br /> Analytical results of water samples collected during April 2001 are summarized on Table 2, The <br /> ' laboratory report (MAI Lab No 65891 through 65901), QA/QC report and chain-of-custody form <br /> are Included in Appendix B <br /> 4.0. SUMMARY AND <br /> (CONCLUSIONS <br /> ' . The following conclusions were drawn from the results of this investigation <br /> ' • The ground water elevations ranged from 5 79 to 5 89 feet below MSL Ground water is <br /> flowing toward the northwest under an average gradient of 0 0009 feet/feet The relative <br /> ground water elevation at the site Increased an average 1 71 feet between the January 2001 <br /> ' and April 2001 monitoring events <br /> 0 Concentrations of dissolved MTBE have decreased slightly in monitoring wells MW3 and <br /> MW4 since the January 2001 monitoring event MTBE levels have remained relatively <br /> constant in MWl since monitoring began in July 2000 <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 /> • Ground water has not been significantly impacted by dissolved petroleum hydrocarbons <br /> 5.0. RECOMMENDAT'IONS <br /> ' Based on the findings of this investigation,AGE recommends continued quarterly monitoring of <br /> the <br /> ' ground water monitoring wells The next monitoring event should be performed in July 2001 <br /> Additionally, AGE recommends installation of additional monitoring wells to assess the lateral <br /> extent of MTBE-impacted ground water <br /> Advanced CeoEnvironmental,Inc <br />