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4?' <br /> 15 May 2000 <br /> AGE-NC Project No 95-0167 <br /> 1 Page 4 of 5 <br /> ' 5.0. FINDINGS <br /> 5 1 GROUND WATER ELEVATION, FLOW DM-ECTION AND GRADIENT <br /> ' The ground water elevation in each well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevations The depths to ground water and relative ground water <br /> ' elevations are tabulated in Table I <br /> The depth to ground water ranged from 14 18 feet below the well casing (bwc) in MW-2 to 13 88 <br /> 1 feet bwc in MW-1 The ground water elevation at the site ranged from -4 89 feet below mean sea <br /> level (ms]) in MW-3 to -5 09 feet msl in MW-2 The ground water gradient was approximately <br /> 0 0025 or 13 feet per mile, over the distance from the up gradient well (MW-3) to the east edge of <br /> ' the site (MW-2) The ground water elevation isocontours are depleted in Figure 3 <br /> 52 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> 1• TPH-g was detected in samples collected from monitoring wells MW-1 and MW-2 at concentrations <br /> of 18,000 micrograms per liter (µg/1) and 3,000 yg/l, respectively TPH-g was not detected in <br /> samples MW-3 and MW-4 <br />' Benzene was only detected in samples collected from wells MW-1 and MW-2 at concentrations of <br /> 3,100 kcg/l, and 340µg/l,respectively Other BTEX compounds were detected in all water samples <br /> at maximum concentrations of 16,000 f..cg/l MTBE was detected by EPA Method 8260-modified in <br /> samples collected from wells MW-1 and MW-2 at concentrations of 61 µg/1 and 9 6 ug/l, <br /> respectively No other fuel oxygenates were detected in any of the samples <br />' Analytical results of ground water samples are summarized in Table 2 and Table 3 The laboratory <br /> report (MAI Laboratory Sample No 30988 to 30991), QA/QC report and cham-off custody form are <br />' included in Appendix B <br />' 6 0 SUMMARY AND CONCLUSIONS <br /> Data collected at the site indicates that <br />' • Theground water flow direction inferred from data collected during this monitoring event <br /> t <br /> is toward the east <br /> • Relatively high concentrations of TPH-g and BTEX occur in ground water to the area of <br /> monitoring wells MW-1 and MW-2 <br /> i <br /> 1 <br />