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�> A S S O C I A T E S I N C <br /> 4 <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from wells MW 1 through MW7, and CW on September <br /> 24, 1998 Water levels ranged from 21 27 to 25 02 feet below the tops of the well casing <br /> elevations, representing an average decrease in the water table elevation of approximately 0 15 <br /> feet since June 1998 The water level data were used to develop the groundwater elevation <br /> contour map (Figure 3) Assuming that horizontal isotropic conditions prevail, groundwater In <br /> the uppermost aquifer beneath the site flowed towards the northeast The average hydraulic <br /> gradient on September 24, 1998 was calculated to be 0 01 ft/ft or approximately 53 fl/mile A <br /> summary of groundwater monitoring data is presented in Table 1 <br /> CONCLUSIONS <br /> Concentrations from wells MW1 through MW7 and CW remain consistent with the results from <br /> previous sampling events It appears as though there are petroleum hydrocarbons remaining in <br /> the soil The direction of groundwater flow and the magnitude of hydraulic gradient are <br /> consistent with the previous event Groundwater elevations have decreased since June 1998 <br /> RECOMMENDATIONS <br /> Based on the results of the third quarter 1998 monitoring episode, we recommend the following <br /> o Conduct the Fourth Quarter 1998 groundwater monitoring and sampling wells MW l <br /> through MW7 and CW and analyze samples for TPHg and BTEX by EPA Method 8020 <br /> w 1977311quwt1y\3gr-1998 doe 3 <br />