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3 <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 August 20, 1999 <br /> Water levels ranged from 23 92 to 24 71 feet below the tops of the well casings, representing an <br /> average decrease in the water table elevation of approximately 2 42 feet since April 1999 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-northeast The average hydraulic gradient on <br /> August 20, 1999 was calculated to be 0 0008 ft/ft or approximately 4 ft/mile A summary of <br /> groundwater monitoring data is presented in Table 1 <br /> CONCLUSIONS <br /> Concentrations of petroleum hydrocarbon constituents remained approximately the same in well <br /> MW-3 and remained at nondetectable concentrations in wells MW-2, MW-4, MW-5, and MW-6 <br /> MTBE was detected in well MW-1 for the first time at a concentration of 7 9 parts per billion <br /> (ppb) <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 third quarter 1999 monitoring episode,we recommend the following <br /> • Conduct the Fourth Quarter 1999 groundwater monitoring and sampling of wells MW-1 <br /> through MW-6 <br /> • Analyze groundwater samples from wells MW-1 through MW-6 for TPHg, BTEX, and <br /> oxgenate fuel additives for one more quarter at the request of PHS/EHD <br /> i <br /> w\626051quartlyl3gr-1999 doc 3 <br />