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f I <br /> ' 08 July 2002 <br /> AGE-NC Project No 98-0521 , <br /> ' Page 3 of 4 <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 330 micrograms per liter (µg/1) and 1,500 µg/1, respectively <br /> • BTEX compounds were detected only In the samples collected from monitonng well MW-4 <br /> at concentrations of 200 µg11 benzene, 7 0 µg11 toluene, 51 µg/1 ethylbenzene and 88 µg/1 <br /> total xylenes <br /> • MTBE was detected by EPA Method 8021 in ground water samples MW-1, MW-2 and <br /> MW-4 at concentrations of 9 4 µg/l, 370 µg/1 and 800 µg/l, respectively, the MTBE results <br /> ' were confirmed by EPA method 8260B at 16 µg/l, 420 µg/1 and 810 µg/1, respectively <br /> I <br /> • TAME was detected in the samples collected from monitoring wells MW-2 and MW-4 at <br /> ' concentrations of 3 0 µg/1 and 4 0µg/l,respectively No other fuel oxygenates were detected <br /> in these samples <br /> C <br /> Analytical results from the monitoring well ground water samples are summarized in Tables 2 and 3 <br /> The laboratory report(CTEL Laboratory IDs 0206-004-1 through 0206-004-4),QA/QC and chain-of- <br /> custody are included in Appendix B <br /> IT <br /> � I � <br /> 4 0 SUMMARY AND CONCLUSIONS '' !' <br /> The following conclusions were drawn from the'results of this investigation c <br /> Ground water at the site was encountered at'approximately 7 8 feet bsg The prevailing <br /> ground water flow direction at the site has been generally toward'the northeast for seven <br /> monitoring events The ground water hydraulic gradient was,estimated to be 0 013 foot/foot <br /> • Dissolved phase hydrocarbons, including TPH-g, BTEX, MTBE and TAME were present <br /> ! In the samples from wells MW-2,located down-gradient of the former UST area,and MW r4, <br /> ' Iocated within the former UST area MTBE was also detected ln'the sample collected from <br /> MW-1, cross-gradient from the former UST area , r <br /> 11' Additional site assessment will be required to fully assess the lateral and`vertical extent of <br /> the dissolved hydrocarbons and MTBE E <br /> [ I <br /> f V k <br /> 1 I 1 <br /> V 1 <br /> t I <br /> Advanced GeoEnviroDMW21,lnc <br /> r F <br /> i tV <br /> I , <br /> lil it I NI I `� II - fl F <br />