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f j <br /> 1 r <br /> 31 July 2000 <br /> AGE-NC Protect No 98-0433 , <br /> 1 Page 3 of 5 3 <br /> GI ound water flow direction and gradient were calculated from the June 2000 gauging data The flow <br /> direction was determined to flow in a westerly direction with a very low hydraulic gradient of 0 0005 <br /> feet/feet to 0 004 feet/feet The depth ground water and calculated elevation date are presented in <br /> ITable 1 <br /> Figure 3 illusti ates the contoured ground water elevations on 20 June 2000 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the gi ound water samples collected from MW-1, MW-2,MW-6, and MW-8 <br /> at concentrations ranging from 240 gg/1-(MW-6)to 880 gg/l(MW-1) TPH-d was detected in water , ' <br /> samples from wells MW-1, MW-2 and MW-6 through MW-8 at concentrations ranging from 170 <br /> µg11 (MW-7) to 3,400 µg11 (MW-2) , <br /> Benzene was only detected in MW-1 and MW-2 at concentrations of 101 µg11 and 4 6 gg/l, <br /> respectively The remaining BTE&X compounds were also detected in these two wells, at <br /> lieconcenti ations as high as 26 µgd (xylenes in MW-1) <br /> MTBE was detected by EPA method 8020 in samples MW-1, MW-2 and MW-4 at 4,800 gg/l, 66 <br /> gg/l and 9 1 µg11, respectively MTBE was I econfirmed by EPA method 8260 in samples MW-1 <br /> thi ough MW-4 at concentrations of 4,500 gg/l, 65 gg/l, 1 8 gg/l and 9 0 gg/l, respectively Of the <br /> i emaming fuel oxygenates, only DIPE and TBA were detected in sample MW-8 at 5 3µg/1 and <br /> 13µg11, I espectively <br /> Petroleum hydrocarbons and fuel oxygenates were not detected in the domestic water well sample <br /> Analytical i esults from groundwater samples are summarized in Table 2 The laboratory report(MAI " <br /> Lab ID Numbers 37065 through 37073),QAIQC and chain-of-custody are included in Appendix B <br /> I , <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> 1r3 <br /> Based upon the data collected during the May/June 2000 monitoring event, AGE concludes <br /> I • Ground water at the site was encountered at approximately 16 40 to 18 10 feet bsg The <br /> prevailing ground water flow direction is generally toward the west with low hydraulic <br /> gradients ranging from 0 0005 feet/feet to 0 004 feet/feet <br /> •f <br /> IAdvanced GeoEnvironmental,Inc <br />