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' 15 November 2000 <br /> AGE-NC Project No 99-0570 <br />' Page 5 of 6 <br />' 34 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g and TPH-d were detected in two of the ground water samples TPH-g was detected in well <br />' samples MW-1 and MW-2 at concentrations of 70 micrograms per liter (4g/1) and 2,000 4g11, <br /> respectively TPH-d was detected in the same samples at 79 µg/l and 1,200 µg/l, respectively <br />' BTEX compounds, were detected in samples MW-1 and MW-2 at concentrations as high as 160,ug/l <br /> (ethylbenzene) <br />' MTBE was detected in samples MW-1, MW-2 and MW-4 at 170 µg11, 26 µg11 and 40 µg/l, <br /> respectively by EPA Method 8020 MTBE was detected at 160 ug/l, 25 ,icg/l and 37 µg/l, <br /> respectively by EPA Method 8260 No other fuel oxygenates were detected in any of the samples <br />' <br /> Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in Table <br />' 4 The laboratory reports for the quarterly monitoring event (MAI Laboratory ID No 49439 to <br /> 49445) QA/QC reports and chain-of-custody form are included in Appendix C <br />� . 4 0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE draws the following conclusions <br /> • Trace concentrations of hydrocarbons were detected in the soil samples collected from boring <br /> MW2 located directly east of the former dispenser area MTBE was not detected, in any of <br /> the soil samples <br /> • Ground water on the site was flowing toward the north from the former dispenser area at a <br /> hydraulic gradient of 0 025 feet/feet <br /> • MTBE was detected in three ground water samples,with the highest dissolved concentrations <br /> occurring east of the former UST area, at concentrations as high as 170 µg/l <br /> • TPH and BTEX was detected in two ground water samples <br /> 5.0. RECOMMENDATIONS <br /> AGE recommends that quarterly monitoring continue <br /> I <br /> Advanced CeoEnvironmental,Inc <br />