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22 June 2001 <br /> • AGE-NC Project No 98-0521 <br /> ' Page 3 of 4 <br /> ' 3 1 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br /> On 31 May 2001,the depth to ground water at the site ranged from 7 51 to 8 04 feet below the tops <br /> 1 of the well casings The ground water elevations at the site ranged from-7 19 feet to-7 71 feet mean <br /> sea level(msl) The ground water flow was directed toward the northeast with a hydraulic gradient <br /> calculated to be 0 008 foot/foot Depth to water and ground water elevation are summanzed in <br /> ' Table 1 Figure 3 illustrates the contoured ground water elevations <br /> ' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> I <br /> ' The results of the May 2001 monitoring event are as follows <br /> • TPH-g was not detected in the samples collected from monitoring wells MW-1 and MW-3 <br /> TPH-g was detected in the samples collected from monitoring wells MW-2 and MW-4 at <br /> concentrations of 74 micrograms per liter(µg/1) and 1,600 gg/l, respectively <br /> ' • BTEX compounds were detected in the sample collected from monitoring well MW-4 at <br /> concentrations of 250µg/l benzene,49µg/1 toluene,43 µg/1 ethylbenzene and 100 µg11 total <br /> xylenes,respectively Benzene and xylenes were detected in the sample from monitoring well <br /> MW-2 at concentrations of 3 0 µg/1 and 0 53 µg/l,respectively BTEX compounds were not <br /> detected in the samples collected from monitoring wells MW-1 and MW-3 <br /> • MTBE was detected by EPA Method 8020 in ground water samples MW-1, MW-2 and <br /> - MW-4 at 69 µg/l, 750 µg/1 and 2,100 µg/l,respectively The MTBE results were confirmed <br /> by EPA method 8260 Modified at 72 µg/l, 760 µg/1 and 1,800 µg/1,respectively TBA was <br /> - also detected in sample MW4 at 350 µg/1 No other fuel oxygenates were detected in these <br /> ' samples <br /> Analytical results from the monitoring well ground water samples are summarized in Tables 2 and 3 <br /> ' The laboratory report (MAI Lab IDs 68795 through 68798),QA/QC and chain-of-custody are <br /> included in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> ' Ground water at the site was encountered at approximately 7 8 feet bsg The prevailing <br /> ground water flow direction at the site is generally toward the northeast The ground water <br /> ' -Advanced GwEnviranmentaI,Inc <br />