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CVV: <br /> o <br /> 7 9 <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 monitoring wells MW1, MW2, and MW3 on <br /> June 4, 2004 Water level elevations ranged from 36 11 to 36 22, representing an average <br /> decrease in water table elevation of approximately 128 feet since March 2004 The water level <br /> data were used to develop the groundwater elevation contour map (Figure 3) Assuming that <br /> horizontal isotropic conditions prevail, groundwater in the uppermost aquifer beneath the site <br /> flowed toward the northwest The average hydraulic gradient on June 4, 2004, was calculated to <br /> be 0 0013 or approximately 6 9 ft/mile A summary of groundwater monitoring data is presented <br /> in Table 1 <br /> ANALYTICAL RESULTS <br /> TPHg was detected in the groundwater samples collected from wells MW1, MW2, and MW3 at <br /> concentrations of 370 micrograms per liter (pg/L), 240 jig/L, and 1,600 µg/L, respectively <br /> Benzene was detected in the groundwater samples collected from wells MW 1, MW2, and MW3 <br /> at concentrations of 10 lig/L, 4 2 pg/L, and 2 4 pg/L, respectively Toluene was detected in the <br /> groundwater sample collected from well MW3 at a concentration of 1 5 µg/L Ethyl Benzene <br /> was detected in the groundwater samples collected from wells MW 1 and MW3 at concentrations <br /> of 3 2 Fig/L and 31 gg/L, respectively Xylenes were detected in the groundwater sample <br /> • collected from well MW3 at a concentration of 34 pg/L MTBE was not detected in the <br /> groundwater samples collected from wells MW 1, MW2, and MW3 Analytical results of <br /> groundwater samples are summarized in Table 2 <br /> CONCLUSIONS <br /> Groundwater flow direction and gradient is generally consistent with previous sampling events <br /> Water table elevations have generally decreased since monitoring was initiated at the site in <br /> 1999 Groundwater analytical results remained within historical parameters as set by previous <br /> groundwater analytical results <br /> RECOMMENDATIONS <br /> Based on the results of the second quarter 2004 monitoring event indicating low concentrations <br /> of benzene in groundwater samples collected from MW1 through MW3, we recommend the site <br /> be considered for closure <br /> s lenvv'onmenta11149811Reportsl2QR-04 doc 3 <br />