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1 <br /> ' 07 April 2003 <br /> . AGE-NC Project No 98-0465 <br /> ' Page 3 of 4 <br /> ' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g, TPH-d and BTEX were not detected at concentrations at or above the laboratory reporting <br /> limits in any of the ground water samples <br /> MTBE was detected in samples collected from MW 1, MW3 and MW4 by EPA Method 8260B at <br /> ' concentrations of 540 µg/1, 8 0 µg/1 and 14µg/l,respectively No other fuel oxygenated compounds <br /> were detected in the ground water analyses at or above laboratory detection limits Figure 4 <br /> illustrates the approximate extent of MTBE-impacted ground water <br /> ' Analytical results of water samples collected during March 2003 are summarized on Table 2, the <br /> laboratory report(MAI Lab IDs 0303135-001 through 0303135-004),QA/QC report and chain-of- <br /> custody form are included in Appendix C <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> ' • Based on the findings from this investigation, AGE concludes <br /> The ground water elevations ranged from 7 71 to 7 84 feet below MSL Ground water was <br /> ' inferred to be north-northeast under an average gradient of 0 001 feet/feet Ground water <br /> gradient and direction remained stable between the November 2002 and March 2003 <br /> monitoring events <br /> 0 TPH-g, TPH-d and BTEX were not detected in the ground water samples collected and <br /> analyzed during the first quarter 2003 <br /> ' 0 MTBE was detected in samples collected from MW-1,MW-3 and MW-4 at concentrations <br /> of 540µg/l,8 0µg/l and 14µg/1,respectively The sample collected from MW-i during this <br /> quarter event decreased since the last monitoring event while the detected concentrations of <br /> ' MTBE in MW-3 and MW-4 have remained relatively stable during the same period <br /> The lateral extent of MTBE-impacted ground water has been defined to the northeast of the <br /> ' former UST area, but not toward the west-northwest, east or south <br /> ' 5.0. RECOMMENDATIONS <br /> ' Based on the findings of this investigation, AGE recommends <br /> . Continued quarterly monitoring of the ground water monitoring wells The next monitoring <br /> event should be performed in May 2003 <br /> Advanced CeoEnvironmental,Inc <br />