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v o <br /> A S S O C I A T E S I N C <br /> average increase in the water table elevation of approximately 1 46 feet since September 2001 <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 generally flowed towards the south-southeast The average hydraulic gradient on <br /> December 27, 2001 was calculated to be 0 0006 ft/ft or approximately 3 2 ft/mile A summary of <br /> groundwater monitoring data is presented in Table 1 <br /> ANALYTICAL RESULTS <br /> TPHg, TPHd, and BTEX were not detected in the samples collected from well MW 1, or from <br /> wells MW3 through MW6 Well MW2 was not sampled due to the presence of free product A <br /> summary of analytical results is presented in Table 2 Laboratory data sheets and chain-of- <br /> custody documentation are contained in Attachment 2 <br /> CONCLUSIONS <br /> Concentrations from wells MW 1, MWS, and MW6 remain generally consistent with the results <br /> from the previous sampling event Concentrations from wells MW3 and MW4 have decreased <br /> from the previous sampling event Free product was still present in well MW2 during the <br /> sampling event The direction and magnitude of groundwater flow is generally consistent with the <br /> Sprevious sampling event, and groundwater elevations have increased since September 2001 <br /> RECOMMENDATIONS <br /> Based on the results of the fourth quarter 2001 monitoring episode, we recommend the following <br /> Conduct the First Quarter 2002 groundwater monitoring and sampling of wells MW1 <br /> through MW6 and analyze samples for TPHg, TPHd, and BTEX <br /> ATC is in the process of finalizing the Corrective Action Plan (CAP) for the site The <br /> CAP will include cost effectiveness evaluation of different remediation technologies for <br /> the site <br /> W <br /> 1625001quaA1yl4gr-2001 doc 3 <br />