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3.0 INVESTIGATIVE RESULTS <br /> 331 Groundwater Monitoring Results <br /> The shallowest groundwater in this portion of the city of Lodi Is reported to occur under unconfined <br />' conditions(Environmental Forensic Investigations, 2002) On June 11, 2004 the highest point measured <br /> from the monitoring wells was 7 53 feet (msl)and occurred in monmtormg well PT-MW-4 The lowest <br /> elevation of the groundwater surface measured from the monitoring wells was 6 76 feet (msl)and occurred <br />' <br /> in monitoring well PT-MW-6 A summary hydrograph for monitoring well PT-MW-1 is presented as <br /> Figure 5 <br /> The average depth to groundwater surface in the six monitoring wells was approximately 46 feet below <br /> ground surface(bgs) The groundwater surface has risen about 0 4 foot since the last monitoring event <br /> (November, 2003) <br />' Electrical conductivity concentrations in the monitoring well water samples were determined to range from <br /> 125 to 255 µmhos/cm This low-conductivity value is typical of reported electrical conductivity values of <br />' local groundwaters found near the Mokelumne River(Figure 2) Concentrations of electrical conductivity <br /> in waters from the Mokelumne River are reported to range from 200 to 350 µmhos/em because the relative <br /> short distance from watershed source in the Sierra Nevada and Quaternary alluvial terrain the waters <br />' traverse(Page, 1986) <br /> Temperature and pH concentrations in the momtormg well waters is typical of I'groundwater encountered <br /> in the Lodi area(Environmental Forensics Inc,2002) <br /> 3.2 Groundwater_A_M43: ical Results <br /> Groundwater analytical results indicate maxunum concentrations of petroleum hydrocarbons and related <br /> gasoline fuel constituents present in the monitoring wells for this quarter monitoring event are as follow <br /> Constituent Concentration Well <br /> benzene 180 µg/L PT-MW-3 <br /> toluene 890 µg/L PT-MW-3 <br />' ethylbenzene 150 µg/L PT-MW-3 <br /> xylene 1100 Pg/1- PT-MW-3 <br /> TPH Gasoline 16,000 µg/L PT-MW-6 <br /> I MTBE 2 6 µg/t, PT-MW-3 (1 2 µg/L in MW-1) <br /> M NA <br /> ET NA <br />' TBA ND <br /> DIPE ND <br /> TAME ND <br />' 1,2-DCA 12 pg/L PT-MW-3 <br /> 1,2-EDB 5 7 µg/L PT-MW-3 <br /> I <br />' Maln\D\EnvironmentalTamwTexaco\Peports1063004Q&M vW 4 <br /> I <br />