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r16 May 2002 <br /> AGE-NC Project No 98-0426 <br /> Page 4 of 5 <br /> 4 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected In the ground water samples collected from MW2 and MW3 at concentrations <br /> of 720 micrograms per liter (µg/1) and 660 µg/1, respectively <br /> Benzene was detected In the samples collected from MW3 and MW-4 at concentrations of 20 µg11 <br />' and 0 51 µgl/l, respectively Toluene was detected only In the ground water sample from MW-3 at <br /> a concentration of 1 8 pg/1 Ethylbenzene and xylenes were detected In MW2 and MW3 at <br /> concentrations as high as 34 µg/1 and 95 µg/l, respectively <br /> MTBE was detected in the sample collected from MW5 at a concentration of 3 5 µg/l No other fuel <br /> oxygenates were detected above laboratory reporting limits In any of the ground water samples <br /> collected <br /> The current and historical ground water analytical results are summarized on Tables 2 and 3 The <br /> laboratory report (MAI Lab IDs 90278 through 90282), chain-of-custody form and the laboratory <br /> QA/QC report are included in Appendix B <br /> lie <br /> 5.4 SUMMARY AND CONCLUSIONS <br /> Based on the data collected during the first quarter 2002 monitoring event, AGE concludes <br /> • Ground water flow at the site was toward the south-southwest with an average gradient of <br /> 0 024 ft/ft Ground water flow direction at the site was approximately 180° from all previous <br /> monitoring events,In addition,the calculated gradient was significantly steeper than previous <br /> monitoring events The average ground water elevation Increased approximately 1 0 feet <br /> since the November 2002 sampling event <br /> • TPH-g was detected In the ground water samples collected from wells MW2 and MW3 at <br /> concentrations of 720 µg/1 and 660 µg/l,respectively, TPH-g concentrations have remained <br /> relatively stable since monitoring began In October 1999 <br />' Benzene was detected In the samples collected from wells MW3 and MW4 Toluene was <br /> detected In the sample from MW3, ethylbenzene and xylenes were detected In the samples <br /> collected from wells MW2 and MW3 <br /> • MTBE was detected In the sample collected from MW5 at a concentration of 3 5 µg/l <br /> MTBE has been detected only sporadically at the site since monitoring began In October <br />' 1999 <br /> IAdvanced GcoEnviron mental,Inc <br /> I <br />