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U illi i IIS I <br /> i <br /> A S S O C I A T E S I N C <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from wells MW 1 through MW7, and CW on June 26, <br /> 1998 Water levels ranged from 21 11 to 24 95 feet below the tops of the well casing elevations, <br /> representing an average increase in the water table elevation of approximately 1 73 feet since <br /> March 1998 The water level data were used to develop the groundwater elevation contour map <br /> (Figure 3) Assuming that horizontal isotropic conditions prevail, groundwater in the uppermost <br /> aquifer beneath the site flowed towards the northeast The average hydraulic gradient on June 26, <br /> 1998 was calculated to be 0 01 ft/ft or approximately 53 ft/mile A summary of groundwater <br /> 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 is petroleum hydrocarbon contamination <br /> remaining in the soil The direction of groundwater flow and the magnitude of hydraulic gradient <br /> are consistent with the previous event Groundwater elevations have increased since March 1998 <br /> . RECOMMENDATIONS <br /> Based on the results of the second quarter 1998 monitoring episode, we recommend the <br /> follovang <br /> o Conduct the Third Quarter 1998 groundwater monitoring and sampling wells MW1 <br /> through MW7 and CW and analyze samples for TPHg, BTEX, and methyl tertiary butyl <br /> ether(MTBE) by EPA Method 8020 only <br /> W 1977311quan1yl2gr-1998 doc 3 <br />