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1 <br />' 19 February 2001 <br /> • AGE-NC Project No 99-0657 <br />' Page 3 of 4 <br />' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected In the all four ground water samples at concentrations ranging from 640µg/1 <br />' in MW3 to 46,000 µg/1 in MW4 TPH-d was also detected in the all four ground water samples at <br /> concentrations ranging from 230µg/1 in MW3 to 2,400 µg/1 in MWI <br /> Benzene was detected in all four water samples at concentrations ranging from 11 µg/1 in MW3 to <br /> 13,000µg/1 in MW4 Toluene, ethylbenzene and xylenes were detected at concentrations as high as <br /> 7,100,ug/l, 760µg/1 and 3,200 4g/1,respectively(MW4) In the ground water samples collected from <br />' MW 1, MW2 and MW4 <br />' MTBE was detected In ground water samples from wells MWI through MW4 at concentrations of <br /> 17,000 µg/1, 13,000 µg/l, 8 2 4g/1 and 3,200 µg/1, respectively TAME, detected only in sample <br /> MW2, had a concentration of 110 µg/1 TBA was detected In the ground water samples collected <br />' from MWI,MW2 and MW4 at concentrations of 2,000µg/1, 110 4g/1, and 1,400µg11, respectively <br /> 1,2-DCA was detected in all four water samples at concentrations as high as 540µg/1 (MW4) EDB <br /> was detected in the water samples collected from MWI and MW4 at concentrations of 150µg/1 and <br />'• 73 µg/l, respectively <br /> The analytical results of water samples collected in January 2001 are summarized on Table 2 The <br /> laboratory report (AAL Order No A01010405), QA/QC report and chain-of-custody form are <br /> included in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> IThe following conclusions were drawn from the results of this investigation <br /> • The ground water elevations ranged from 10 22 to 10 41 feet AMSL Ground water is <br /> flowing toward the southwest at an average gradient of 0 003 feet/feet The relative ground <br /> water elevation at the site decreased an average 0 85 feet between the October 2000 and <br /> January 2001 monitoring events <br />' Concentrations of dissolved TPH-g, TPH-d, BTEX compounds and fuel oxygenates have <br /> increased significantly in all the monitoring wells sampled since the last monitoring event <br /> in October 2000 The highest concentration of dissolved hydrocarbons is in monitoring wells <br /> MWI and MW4 which are south and south-southwest and downgradlent of the UST area <br /> • The lateral extent of petroleum hydrocarbon-impacted ground water has not been defined <br /> i <br /> I <br /> Advanced GeoEnviron mental,Inc <br />