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�.i <br /> r <br /> 5.2 Ground Water Gradient <br /> A ground water gradient map was produced from the data obtained from the September <br /> 22, 1995 sampling event (Figure 2). The ground water gradient between MW-2 and MW- <br /> 6 is calculated to be 0.003 ft/ft. The ground water flow direction is toward the west <br /> during this sampling event. This gradient and flow direction is consistent with previous <br /> monitoring events. <br /> TABLE 4 <br /> Monitoring Well Water Elevations <br /> Well Date Well Collar Depth to Water Ground Water <br /> Number Elevation (feet) Elevation(feet) <br /> feet <br /> MW-1 9/22/95 57.73 11.69 46.04 <br /> MW-2 9/22/95 58.82 12.31 46.51 <br /> MW-3 9/22/95 58.28 11.77 46.51 <br /> MW-4 9122195 57.49 10.96 46.53 <br /> MW-5 9/22/95 57.88 11.96 45.92 <br /> MW-6 .9/22/95 .57.38 11.69 45.69 <br /> 5.3 f Discussion a o Analytecal Results <br /> Laboratory analysis of ground water samples collected during this sampling event indicate <br /> the presence of gasoline and gasoline constituents in two of the six monitoring wells. The <br /> bailer blanks collected at MW-1 and MW-6 indicated non detectable levels for all analyzed <br /> constituents. The travel blank was not analyzed during this sampling event. <br /> The gasoline and gasoline constituent levels present in the sample collected from <br /> monitoring well MW-1 are consistent with data obtained from previous sampling events. <br /> No significant changes were noted in ground water quality at this location. <br /> A slight decrease was noted in the ground water sample collected from MW-6. The level <br /> of ethyl benzene decreased from 4.8 µg/L to 1.4 µg/L and total xylenes decreased from <br /> 4.8 µg/L to less than the detection limit of 0.6 gg/L. The analytical laboratory noted that <br /> the chromatogram for this sample did not match their gasoline standard's chromatogram. <br /> American Geological Services,Inc. <br /> �' CA95DE-029 <br />