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' 4 21 December 2001 AGE-NC Protect No 97-0312 . , Page 3 of 4 , ' 3 1 GROUND WATER ELEVATION AND GRADIENT Ground water 1 ation decreased~an average 5 48 feet at the site since the 18 June 2001 momtorvag event Ground water flow direction was inferred to be east-southeasterly with an average gradient of approximately 0 064 feet/feet Figure 3 depicts the groundwater elevation contours for September 2001 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in sample collected from UST-5 at a concentration of 490 mtcr'ograrm per liter (gg/l) TPH-d dvas detected in samples collected from UST-1 and UST-5 at concentrations of 99 gg/l _ ' and 70 gg/l,respectively Benzene, toluene and ethylbenzene were detected in the samples collected from UST-5 at concentrations of 26 µg/l, 2 0 gg/1 and 0 60 gg/l, respectively Ethylbenzene and ' -kylenes were detected insampJes collected from UST-1,UST-2,UST-3 and UST-4 at concentrations as high as 4,1 µg11 and 23 gg/l, respectively Toluene was also-detected in the large domestic well at 0 66 µg11, however toluene was not detected in a confirmation sample collected on 04 October '• 2001 r TPH-g and BTEX constituents were detected at concentrations of 74 gg/l,4 7 ggl, 11 gg/1,2 6 µg/1 ' and 13 4g11, respectively, in the ecutpment blank- TBA was detected in the water sample collected from UST-5 at a concentration of 9 1 gg/I No other ' fuel oxygenated compounds were detected above laboratory reporting levels in the ground water samples collected this quarter The laboratory report(MAI Lab IDs 78823 through 78831 and 80151) and chain-of-custody fortes are included in Appendix B Analytical results of water samples ' collected during the third quarter 2001 are summarized on Table 2 The analytical results of allwater samples are summarized on Table 3 ' Ground water samples were not analyzed-for cbloriinated hydrocarbons during this quarter ' 4.0. DISCUSSION AND CONCLUSIONS y ti ' Based upon data collected from the site, AGE concludes • Ground water elevation decreased'approxxmately 5 48 feet at the site between the June 2001 and the September 2001 monitoring events The inferred ground water flow direction is ' toward the east-southeast The average ground water gradient was 0 004 ft/ft across the site • During the September 2001 monitoring event TPH-g, benzene, toluene and ethylbenzene 1 r Advanced GeoEnvironmental,Inc