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1 10 03 March 2004 AGE-NC Project No 01-0827 Page 4 of 6 The ground water elevations and gradient were calculated and determined from depths to ground water data from monitoring wells MW-1 through MW-6 The ground water elevations at the site ranged from 12 83 feet(MW-5)to 14 30 feet(MW-2)below mean sea level(MSL) West of the site the ground water flow direction was inferred to be towards the east and on-site the flow direction was inferred to be south to southeast, at gradients of approximately 0 019 foot per foot (ft/ft) west of the site and 0 0088 ft/ft on-site (Figure 3) 1 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES 17 December 2003 - TPH-g was detected in the ground water sample from well VW-2d at a concentration of 2,500 micrograms per liter (µg/1) BTEX compounds were detected in the same sample at concentrations of 310µg11 benzene, 49 µg/1 toluene, 56 µg/1 ethylbenzene and 72 µg/l xylenes The fuel additive MTBE was only detected in ground water sample VW-2d at a concentration of 53 µg/1 No other constituents of concern were detected in the ground water sample from VW-2d (Tables 2 and 3) ' 09 January 2004 - TPH-g was detected in the ground water samples from wells MW-6 and VW-2d at concentrations of 480 µg/1 and 350 µg/1, respectively Various BTEX compounds were detected in samples MW-6 and VW-2d at maximum concentrations of 73µg/l benzene, 7 4 µg/l toluene, 9 2 µg/1 ethylbenzene and 10 8 µg/1 xylenes The fuel additive MTBE was detected in ground water samples at a maximum concentration of 25 µg/1 (VW-2d) The fuel additives DIPE, ETBE, and TAME were detected for the first time in several quarters No other constituents of concern were 1 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 report (CTEL ' Project No 214-0312145 and 214-040140)and chain-of-custody form are included in Appendix B ' 4 0. SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE finds ' • On 09 January 2004,groundwater was encountered at a depth of approximately 23 feet btoc West of the site the ground water flow direction was inferred to be towards the east and on- site the flow direction was inferred to be south to southeast, at gradients of approximately 0 019 foot per foot (ft/ft) west of the site and 0 0088 ft/ft on-site ' • With the exception of wells VW-1 and VW-3, all other wells are "drowned" and analytical data from these wells may not be representative of their respective ground water conditions • The maximum concentrations of petroleum hydrocarbon and BTEX compounds in ground ' water were detected in the ground water sample collected from deep vapor well VW-2d The