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' 4.0 INVESTIGATIVE RESULTS <br /> 4A1 Groundwater Monitoring Results <br /> The shallowest groundwater in this portion of the city of Lodi is reported to occur under <br /> unconfined conditions(Muir, 2004d, Environmental Forensics 2002) On December 8, 2005 the <br />' highest groundwater surface elevation measured from the six monitoring wells was 7 15 feet <br /> above mean sea level (msl) and occurred in monitoring well PT-MW4 The lowest groundwater <br /> surface elevation measured during flus monitoring event was 6 65 feet above msl and occurred in <br /> monitoring well PT-MW6 A summary hydrograph for monitoring well PT-MWl and PT-MW3 <br /> are presented as Figures 6 and 7, respectively <br /> The average depth to groundwater surface in the six monitoring wells was approximately 46 7 feet <br /> below ground surface (bgs) The groundwater surface has fallen about 0 5 feet since the last <br />' monitoring event(3rd Quarter 2005) <br /> Electrical conductivity concentrations in the monitoring well water samples were determined to <br /> range from 180 to 315 µmho/cm This low-conductivity value is typical of reported electrical <br /> conductivity values of local groundwaters found near the Mokelumne River(Page, 1986). The <br /> Mokelumne River supplies the vast majority of groundwater recharge of the I'water bearing <br /> zones within the site vicinity(Piper and others, 1939) Concentrations of electrical conductivity <br /> in waters contained in the Mokelumne River are reported to range from 200 to 350 µmhos/cm <br /> because of the relative short distance from the watershed source in the Sierra Nevada and <br /> • Quaternary alluvial terrain that is comprised of clean sand the waters traverse (Page, 1986) <br /> Temperature and pH concentrations in the monitoring well waters are typical of I'groundwater <br /> producing zones in the Lodi area(Environmental Forensics, 2002) <br /> MM\D\Enera=enbAParmaffexaco\Repom\QMR0123105 wpd 6 <br />