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, v <br /> ATC <br /> A S S O C I A T E S INC <br /> The groundwater analytical results measured at monitoring well MW3 showed detectable <br /> concentrations of TPHg at 510 pg/L, benzene at 140 µg/L, ethylbenzene at 3 6 gg/L, and <br /> xylenes at 1 3 gg/L <br /> The Maximum Contaminant Level (MCL) for benzene, 1 µg/L, was exceeded at monitoring <br /> wells MW 1, MW2, and MW3 which had detected concentrations of 23 µg/L, 2 5 µg/L and 14 <br /> µg/L, respectively <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from monitoring wells MW1, MW2, and MW3 on <br /> December 13, 2001 Water level elevations ranged from 36 29 to 36 38, representing an average <br /> increase in water table elevation of approximately 0 19 feet since September 2001 The water <br /> level data were used to develop the groundwater elevation contour map (Figure 3) Assuming <br /> that horizontal isotropic conditions prevail, groundwater in the uppermost aquifer beneath the <br /> site flowed towards the northeast The average hydraulic gradient on December 13, 2001 was <br /> calculated to be 0 001 or approximately 8 ft/mile A summary of groundwater monitoring data is <br /> presented in Table 1 <br /> . CONCLUSIONS <br /> Groundwater flow direction and gradient is consistent with previous sampling events Water <br /> table elevations have increased slightly since the September 2001 monitoring event <br /> Groundwater analytical results show a general decrease in concentrations, though most remained <br /> within historical parameters as set by previous groundwater analytical results <br /> w Iwordpro\149811RepoM\4QR-D1 doc 3 <br />