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. 24 May 2001 - <br /> AGE-NC Project No 98-0521 <br /> Page 3 of 4 <br /> t3 1 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br /> ' On 28 February 2001, the depth to ground water at the site ranged from 6 90 to 7 46 feet below <br /> the tops of the well casings The ground water elevations at the site ranged from-6 58 feet to -7 13 <br /> feet mean sea level(msl) The ground water flow was directed toward the northeast with a hydraulic <br /> ' gradient calculated to be 0 013 foot/foot Depth to water and ground water elevation are summarized <br /> in Table 1 Figure 3 illustrates the contoured ground water elevations <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ' The results of the February 2001 monitoring event are as follows <br /> ' TPH-g was not detected in the samples collected from the monitoring wells MW-1 though <br /> MW-3 TPH-g was detected in the sample collected from the monitoring well MW-4 at 4,800 <br /> • micrograms per liter (gg/1) <br /> ' •- BTEX compounds were detected in only the sample collected from momtormg well MW-4 <br /> at concentrations of 710 µg/l benzene, 250 µg11 toluene, 150 µg/1 ethylbenzene and 420 µg/l <br /> ' total xylenes, respectively <br /> • MTBE was detected by EPA Method 8020 in ground water samples MW-1, MW-2 and <br /> MW-4 at 38 µg/l, 520 4g/1 and 3,000 µg/1, respectively The MTBE results were confirmed <br /> ' by EPA method 8260 Modified at 41 µg/1, 620 µg/1 and 3,100 µg/1, respectively TBA was <br /> also detected in sample MW-1 at 9 3 µg/l No other fuel oxygenates were detected in these <br /> samples <br /> t Analytical results from the monitoring well ground water samples are summarized In Tables 2 and 3 <br /> The laboratory report (MAI Lab IDs 61068 through 61071),QA/QC and chain-of-custody are <br /> ' included in Appendix B <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> I <br /> The following conclusions were drawn from the results of this investigation <br /> ' approximately7 2 feet bs The prevailing <br /> Ground water at the site was encountered at g p g <br /> ground water flow direction at the site is generally toward the northeast The ground water <br /> . hydraulic gradient was estimated to be 0 013 foot/foot <br /> ' Advanced GeoEnv"nment4 Inc <br /> 1 I <br />