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' 16 February 2005 <br /> • AGE-NC Project No 97-0326 <br />' Page 3 of 5 <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were determined from field data Hydrocarbon impact <br />' to ground water was quantified by laboratory analysis of ground water samples <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the September 2004 sampling event, depths to ground water ranged from 36 57 feet <br /> to 39 47 feet below the tops of the well casings The depth to ground water (37 83 feet) at well <br /> MW-1 was affected by the presence of approximately 0 25 inches of free product observed within <br />' a bailer and 0 3 feet measured, so the depth was recalculated (37 60 feet) utilizing the measured <br /> thickness of free product in well MW-1 <br /> D,,,= D,,, - (tg * dgld,,,) <br /> D,,,= Corrected depth to water <br /> t• D = Measured depth to water <br /> tg = Total thickness of free product (-0 3 foot) <br /> dg= Density of free product (gasoline at—0 75 g/ml) <br /> 1 d,,,= Density of water (-1 0 gm/ml) <br /> During this monitoring event, the water level was within the screened intervals of all the wells, <br />' indicating that the wells are screened properly to yield representative shallow ground water samples <br />' Ground water elevation contours based on the data for the September 2004 monitoring event are <br /> illustrated on Figure 3 Groundwater was inferred to be flowing toward the south to southwest under <br /> a hydraulic gradient of approximately 0 004 foot/foot (ft/ft) The gradient and flow direction are <br />' consistent with the previous monitoring events <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> Eleven ground water samples were collected and submitted for laboratory analysis for the <br /> constituents listed in Section 2 2 , the analytical results are provided in Table 2 Based on the <br /> analytical results, each hydrologic unit is characterized below <br /> HU1 -TPH-g was detected in ground water samples collected from HU 1 from wells MW-2,MW-3, <br /> • MW-8A, and MW-9A at concentrations ranging from 2,400 micrograms per liter (µg/1) in sample <br /> Advanced GeoEnvironmental,Inc <br />