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` j <br /> • 20 October 2004 <br /> AGE-NC Project No 95-0135 <br /> 'Page 3 of 5 <br /> 3.0` ' FINDINGS <br /> Ground water elevation and flow direction were Inferred from field data, hydrocarbon Impact to <br /> groundwater was quantified by laboratory analysis of the'ground water samples ` <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each of the monitoring wells was calculated by subtracting the <br />' depth to ground water from the surveyed relative casing elevations, current-and historical ground <br /> water elevation results are provided in Table 1 Each ground water elevation is grouped according , <br /> to the HU that the well sampled, on the assumption that the elevation will reflect hydrostatic <br /> conditions within the sampled HU <br /> • In HU1, ground water elevations ranged between 14 86 feet below mean sea level(MSL) in <br />' well MW-1B and 15 28 feet below MSL in well MW-3B The ground water flow direction <br /> was inferred to be southeast under a hydraulic gradient of approximately 0 004 foot/foot <br /> . (ft/ft) Figure 3 illustrates the contoured ground water elevations in HU1 as measured on <br /> 28 May 2004 <br /> i <br /> 0 In'HU2, ground water elevations ranged between 15 07 feet (MW-IA) and 15 30 feet <br /> (MW-3A)below MSL The ground water flow direction was inferred to be southeast under <br /> a hydraulic gradient of approximately 0 002 ft/ft Figure 4 illustrates the contoured ground <br /> water elevations in HU2 as measured on 28 May 2004 <br /> r <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> Six ground water samples were submitted for laboratory analysis, samples MW-1B, MW-2B, and <br /> MW-3B were collected from HU1, samples MW-lA, MW-2A, and MW-3A were collected from <br /> HU2 The analytical results indicated that the highest:concentrations of contaminants were detected <br /> in HU2 ground water ; <br /> 3 2 1 HU 1 r <br /> I <br /> TPH-g was detected, in the water samples collected from wells MW-2B and MW-3B at <br /> concentrations of 170 micrograms per liter (µg/1) and 120 µg/1, respectively In addition, the fuel <br />' additives MTBE and DIPE were detected in sample MW-2B at concentrations of 15 pg/l and 3 2 <br /> • pg/l, respectively <br /> Advanced GeoEnvlronmental,Inc <br /> I <br />