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aF <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 MW-6 on February 1, 2001 <br /> Water levels ranged from 24 71 to 25 56 feet below the tops of the well casings, representing an <br /> average decrease in the water table elevation of approximately 0 24 feet since November 1999 <br /> The water level data were used to develop the groundwater elevation contour map (Figure 3) <br /> Assuming that horizontal isotropic conditions prevail, groundwater in the uppermost aquifer <br /> beneath the site flowed generally towards the east The average hydraulic gradient on February 1, <br /> 2001 was calculated to be 0 002 ft/ft or approximately 11 ft/rrule A summary of groundwater <br /> monitoring data is presented in Table 1 <br /> CONCLUSIONS <br /> Concentrations of petroleum hydrocarbon constituents increased in well MW-2, but remain well <br /> below MCLS The concentration of MTBE remained approximately the same in well MW-1 and <br /> was reported below the MCL Concentrations of petroleum hydrocarbons decreased in well <br /> MW3 up to one order of magnitude Concentrations of petroleum hydrocarbons remained at <br /> nondetectable levels in wells MW-4, MW-5, and MW-6 <br />• The direction of groundwater flow and the magnitude of hydraulic gradient are generally <br /> consistent with previous quarters <br /> RECOMMENDATIONS <br /> Based on the results of the first quarter 2001 monitoring episode, we recommend performing <br /> second quarter 2001 monitoring and reporting Groundwater samples should be analyzed for <br /> TPHg, BTEX, MTBE, ETBE, DIPE, TBA, and TAME If concentrations remain consistent, we <br /> recommend evaluating the site for closure <br /> I� <br /> W 1626onquatlyllqrzoor doe 3 <br />