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5 <br /> T 9 7 <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 April 24, 2002 <br /> Water levels ranged from 27 03 to 27 84 feet below the tops of the well casings, representing an <br /> average increase in the water table elevation of approximately 0 25 feet since January 2002 The <br /> 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 April 24, <br /> 2002 was calculated to be 0 001 ft/ft or approximately 6 ft/n-ole A summary of groundwater <br /> monitoring data is presented in Table 1 <br /> CONCLUSIONS <br /> Concentrations of petroleum hydrocarbon constituents increased in well MW-3 during the second <br /> quarter 2002, but remain at levels consistent with recent quarterly monitoring events <br /> Concentrations of petroleum hydrocarbons remained at nondetectable levels in wells MW-1, MW- <br /> 2, MW-4, MW-5, and MW-6 <br /> The direction of groundwater flow and magnitude of the hydraulic gradient are generally <br /> consistent with previous quarters <br /> RECOMMENDATIONS <br /> Based on the results of the second quarter 2002 momtonng episode, we recommend performing <br /> third quarter 2002 monitoring and reporting Groundwater samples should be analyzed for <br /> TPHg, BTEX, and MTBE <br /> A groundwater extraction pilot test will be scheduled pending preapproval from the State UST <br /> Cleanup Fund <br /> I <br /> W 1626051quan1y12QR-2002 doc 3 <br />