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VYATC <br /> A S S O C I A T E S I N C <br /> The groundwater analytical results measured at monitoring well MW3 showed detectable <br /> concentrations of TPHg and BTEX TPHg was detected at a concentration of 680 µg/L., benzene <br /> at 14 µg/L, toluene was detected at 0 9 pg/L, ethylbenzene at 6 8 µg/L, and xylenes at 8 2 µg/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 15 µg/L, 2 7 pg/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 /> September 19, 2002 Water level elevations ranged from 36 12 to 36 21, representing an average <br /> decrease in water table elevation of approximately 1 38 feet since June 2002 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 towards the northeast The average hydraulic gradient on September 19, 2002 was <br /> calculated to be 0 001 or approximately 6 8 ft/mile A summary of groundwater monitoring data <br /> is presented in Table 1 <br /> CONCLUSIONS <br /> • Groundwater flow direction and gradient is consistent with previous sampling events Water <br /> table elevations have decreased slightly since the June 2002 monitoring event Groundwater <br /> analytical results remained within historical parameters as set by previous groundwater analytical <br /> results <br /> • <br /> w lwordprol149811Reportsl2QR-02 doe 3 <br />