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I17 August 2004 . AGE-NC Prol ect No 01-0827 Page 4 of 6 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION On 10 May 2004,depths to ground water in monitoring wells MW-1 through.MW-6 and vapor wells ' VW-1, VW-2d, VW-3 and VW-5d ranged from 21 85 to 23 43 feet below the tops of the casings (btoc), depths to ground water in monitonng wells and vapor wells ranged from 22 32 to 24 03 feet btoc on 10 June 2004 (Table 1) IThe ground water elevations and gradient were calculated and determined from depths to ground water data from monitoring wells MW-1 through MW-6 The May ground water elevations at the ' site ranged from 11 95 feet (MW-5) to 12 96 feet (MW-1) below mean sea level (MSL), the June ground water elevations at the site ranged from 12 42 feet (MW-5) to 13 44 feet (MW-1) below MSL The ground water flow direction was inferred to be towards the east to southeast, at gradients ' of approximately 0 01 foot per foot (ft/ft) in May and 0 009 ft/ft on-site in June (Figures 3 and 4) ' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES On 10 May 2004, TPH-g was detected in the ground water sample collected from well VW-2d at a concentration of 1,500 micrograms per liter (µg/1) BTEX compounds were detected at concentrations of 330µg/1 benzene, 34 µg/1 toluene, 43 µg/1 ethylbenzene and 52 µg/1 xylenes MTBE was the only fuel additive detected, at a concentration of 68 µg/1 No other constituents of tconcern (COC)were detected in sample VW-2d (Tables 2 and 3) ' On 10 June 2004, TPH-g was detected in the sample collected from well VW-2d at a concentration of 1,100 µg/1 BTEX compounds were detected at concentrations of 750 gg/1 benzene, 32 pg/l toluene, 36 µg/1 ethylbenzene and 33 µg/1 xylenes MTBE was the only fuel additive detected, at a ' concentration of 38 µg/1 No other COC were detected in sample VW-2d (Tables 2 and 3) On 12 July 2004,TPH-g was detected in the sample collected from well VW-2d at a concentration ' of 700 µg/1 BTEX compounds were detected at concentrations of 60 µg/1 benzene, 3 2 µg/1 ethylbenzene and 3 2 µg/1 xylenes The fuel additive MTBE was detected at a concentration of 86 µg/1 No other constituents were detected in the ground water sample from VW-2d (Tables 2 ' and 3) The analytical results are summarized in Tables 2 and 3 A copy of the laboratory reports (CTEL ' Protect Nos CT214-0405044, 0406100, 0407078) and chain of custody forms are included in Appendix B GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are included in Appendix C ' Advanced GevEnvironmental,Inc t