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05 March 2004 AGE-NC Project No 99-0559 1 Page 4 of I 1 ' 3.0. FINDINGS Groundwater elevation,flow direction and gradient were determined from field data collected during ' the second- and third-quarter monitoring events, the contaminant impact to ground water was quantified by laboratory analysis of the ground water samples 3 1 GROUND WATER ELEVATION AND GRADIENT ' The elevation of ground water in each monitoring well,during each monitoring event, was calculated by subtracting the depth to ground water from the surveyed casing elevation, current and historical ground water elevation results are provided in Table 1 Each ground water elevation is grouped ' according to the HU or HUs that the well samples,on the assumption that the elevation will reflect hydrostatic conditions within the sampled HUs Ground water elevation data from wells which exhibited residual free-petroleum product, was not for the ground water flow and gradient ' calculation Second Quarter Monitoring Event ' HU 1 and HU2 The depth to ground water from monitoring wells MW-1 through MW-4 and MW-5A through IMW-SA ranged from 57 52 to 58 81 feet below casing grade Ground water elevation data collected from monitoring wells MW-1 through MW-4, and MW-5A through MW-8A ranged between 32 72 feet(MW-4) and 33 67 feet(MW-2)below mean sea level (MSL) Ground water elevation increased approximately 0 85 feet over the last quarter The top of the ground water table was within the screened intervals of the wells At the time of the May 2003 monitoring event, the potentiometric surface based on HU1 and HU2 wells inferred that a east flowing ground water flow direction from the site to the east at well MW-8 with hydraulic gradient of 0 004 feet (Figure 3) HU3 and HU4 In the wells representing HU3 and HU4, the depth to ground water ranged from 57 60 to 58 40 feet below casing grade Ground water elevation data collected from monitoring wells MW-513 through Advanced GeoEnvironmental,Inc