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4.0 INVESTIGATIVE RESULTS <br /> 441 Groundwater Monitoring Results <br /> The shallowest groundwater in this portion of the city of Lode is reported to occur under <br /> unconfined conditions (Muir, 2004d, Environmental Forensics 2002) On June 9, 2005 the <br /> I highest groundwater surface elevation measured from the six monitoring wells was 8 13 feet <br /> above mean sea level(ms]) and occurred in monitoring well PT-MW4 The lowest groundwater <br /> surface elevation measured during this monitoring event was 7 58 feet above msl and occurred in <br /> monitoring well PT-MW6 A summary hydrograph for monitoring well PT-MW1 and PT-MW3 <br /> are presented as Figures 6 and 7, respectively <br /> I The average depth to groundwater surface in the six monitoring wells was approximately 45 6 <br /> feet below ground surface (bgs) The groundwater surface has risen about 10 foot since the last <br /> monitoring event(V Quarter 2005) <br /> EElectrical conductivity concentrations in the monitoring well water samples were determined to <br /> range from 180 to 285 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 V 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 V groundwater <br /> producing zones in the Lodi area(Environmental Forensics, 2002) <br />' Mam\D\E eraumentallPazmarTexacolReportslQMR063005 6 <br /> • <br />