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i <br />' 4.0 INVESTIGATIVE RESULTS <br /> 4.11 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 2042) On August 24, 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 this monitoring event was 6 65 feet above msl and occurred in <br />' monitoring well PT-MW6 A summary hydrograph for monitoring well PT-MWI 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 <br /> feet below ground surface(bgs). The groundwater surface has fallen about 1.0 feet since the last <br /> monitoring event(2nd Quarter 2005). <br />' Electrical conductivity concentrations in the monitoring well water samples were determined to <br /> range from 185 to 305 Vmho/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 V water bearing <br /> zones within the site vicinity(Piper and others, 1939) Concentrations of electrical conductivity <br /> in waters contained in the Mokelunine 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 /> MaM\DlE005 wpd 6 <br />