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r i <br />' 07 January 2002 <br /> . AGE-NC Project No. 98-0440 <br /> Page.3 of 4 <br /> The ground water flow.direction was inferred using ground water elevation data. The ground water <br />' afthe site-on 07'December 2001 was inferred to have been flowing to the north-northwest udder an <br /> average gradient of 0.006 feet/feet across the area monitored. Figure 4 illustrates the ground water <br /> elevation contours. <br /> 3.2. ANALYTICAL"RESULTS OF GROUND WATER SAMPLES <br /> TPH-g-was detected in-the water samples collected from monitoring wells MW2, MW5 and MW6 <br /> at concentrations of 340 micrograms per liter(µg/1), 1,000 µgil and 170 µg/1,respectively.TPH-d , <br />' was detected in the .water samples co'llect'ed from monitoring wells MW2 and MW5 at. <br /> concentrations of 63 µg/l and 170 µg/l,'respectively. <br />' One or more BTEX compounds were detected in'the water samples collected from wells MW2, <br /> MW5 and MW6 --at concentrations - as ' high as 49 '�igll benzene, 2.0 µgll toluene, <br />' 140 µgh ethylbenzene and 31 µg/i total.xylenes. MTBE and the other :fuel additives were not <br /> detected at,or above laboratory reporting limits in the ground water samples. . <br />'• None of the analytes were detected at or above laboratory reporting limits in the water sample <br /> collected from domestic well DW5157. ' <br />' Currci t and previous analytical results are summarized on Table 2.The laboratory report(MAI Lab <br /> ID No.. 85707 through 85713), QA/QC report and chain-6f-custody form are included in, <br />' Appendix B. <br /> 4:0. SUMMARY AND CONCLUSIONS <br /> BasEd on the-data collected during this monitoring period,.AGE.concludes: " <br />' On�07'December 2001,theound water at the,site was inferred to be flowing`toward the " <br /> �' <br /> north-northwest under an average'gradient of 0.006 feetlfeef across the area monitored. <br /> IThe highest concentration' of dissolved hydrocarbons quantified,as TPH=g and BTEX <br /> compounds' extends •northeast from .USTs No. 4 and. 5. Dissolved hydrocarbons were <br /> encountered: in the'dawn-gradient direction. from' the former. USTs in,samples from <br /> monitoring wells MW2,MW5 and MW6:Dissolved hydrocarbon concentrations remained <br /> non-detectable in samples from wells MW 1,MW3, and MW4,and concentrations increased <br /> in samples'from wells MW2,MW5 and MW6. A map showing the'approximate extent of ' <br /> dissolved TPH-g is.presented in Figure 5. <br /> Advanced GeoEnvironmental,Inc. <br />