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v <br /> • A S S O C I A T E S I N C <br /> Groundwater samples from wells MW1, MW3, and MW7 continue to contain elevated <br /> concentrations of TPHg and BTEX A summary of analytical results is presented in Table 1 <br /> Laboratory data sheets and chain-of-custody documentation are contained to Attachment 2 <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from wells MW1 through MW7, and CW on <br /> November 27, 2000 Water levels ranged from 21 46 to 24 29 feet below the tops of the well <br /> casing elevations, representing an average decrease in the water table elevation of approximately <br /> 0 59 feet since September 2000 The water level data were used to develop the groundwater <br /> elevation contour map (Figure 3) Assuming that horizontal isotropic conditions prevail, <br /> groundwater in the uppermost aquifer beneath the site flowed towards the northeast The average <br /> hydraulic gradient on November 27, 2000 was calculated to be 0 003 ft/ft or approximately 16 <br /> ft/mile A summary of groundwater monitoring data is presented in Table 1 <br /> CONCLUSIONS <br /> Concentrations of TPHg and BTEX in wells MW1 through MW7 remain consistent with the <br /> results from previous sampling events It appears as though there are petroleum hydrocarbons <br /> remaining in the soil The direction of groundwater flow and the magnitude of hydraulic <br /> gradient are generally consistent with the previous event Groundwater elevations have <br /> decreased since September 2000 <br /> RECOMMENDATIONS <br /> Based on the results of the Fourth Quarter 2000 monitoring episode, we recommend the <br /> following <br /> Conduct the First Quarter 2001 groundwater monitoring and sampling wells MW 1 <br /> through MW7 and CW and analyze samples for TPHg and BTEX by EPA Method 8020 <br /> w 1625961quartlyl3gr-2000 do-, 3 <br />