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,7 <br /> -rte <br /> 1 <br /> slight mounding effect noted in the vicinity of well MW-2. The average hydraulic gradient on <br /> October 10, 1996 was calculated to be 0.008 ft/ft or approximately 42 ft/mile. A summary of <br /> groundwater monitoring data is presented in Table 1. <br /> CONCLUSIONS <br /> Petroleum hydrocarbon constituents remained detectable in the groundwater samples collected <br /> from wells MW-3 and MW-6. Concentrations of petroleum hydrocarbon constituents generally <br /> increased in well MW-3 since the last monitoring episode in July 1996 and were similar to the last <br /> quarter results in well MW-6. <br /> The direction of groundwater flow and the magnitude of hydraulic gradient are consistent with the <br /> previous quarter. Groundwater elevations have dropped due to seasonal conditions. <br /> RECOMMENDATIONS <br /> Based on the results of the fourth quarter 1996 monitoring episode, we recommend the following- <br /> 0 Continued quarterly monitoring of depth to water in all wells on site. <br /> o Continued quarterly sampling of wells MW-3, and MW-6 and semiannual sampling of <br /> wells MW-1, MW-2, MW-4 and MW-5. <br /> Please contact our office at 209 579-2221 if you have any questions or comments., <br /> 1 <br /> Respectfully Submitted, <br /> Smith Technology Corporation <br /> Drc,,, i4,_Aj_ - <br /> Drew Van Allen oQ QEES.1Z <br /> Staff Scientist lE,aNNE •��� <br /> HOMSEY <br /> Jeanne Hornsey, No.C047410 <br /> CA Registered Civil Engineer No. 47410 <br /> CIVIL <br /> cc: Gerald Thiemann F Q <br /> Elizabeth Thayer, RWQCB F Cla�� <br /> w:W43731quar1yl4gr-I996.doc 3 <br /> c SMTH <br />