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4.0 INVESTIGATIVE RESULTS <br /> • ami Groundwa r MqniLqdU R al <br /> I <br /> The shallowest groundwater to this portion of the city of Lodi is reported to occur under <br />' unconfined conditions(Muir, 2004d,Environmental Forensics 2002) On March 3,2005 the <br /> highest groundwater surface elevation measured from the six monitoring wells was 7 20 feet <br /> above mean sea level(msl)and occurred in monitoring well PT-MWS The lowest groundwater <br />' surface elevation measured during this monitoring event was 6 60 feet above insl and occurred in <br /> monitoring well PT MW3 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 6 80 <br /> feet below ground surface(bgs) The groundwater surface has risen about 0 9 foot since the last <br />' monitoring event(4d Quarter 2005) <br /> Electrical conductivity concentrations in the monitoring well water samples were determined to <br />' range from 150 to 225µmho/cin. 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 beanng <br />' zones within the site vicinity (Piper and others, 1939) Concentrations of electneal conductivity <br /> in waters contained in the Mokelumne River are reported to range from 200 to 350µmhos/cm. <br /> because of the relative short distance from the watershed source m 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 /> 1 <br />' SAamlDlHrevvaamariailP re% �i 1QMIiQ3S1[15 wpd 6 <br />