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• 2`2 Laboratory Anal tical Methods <br /> The water samples were analyzed by Kiff Analytical LLC, Davis, California, California state <br /> certified analytical laboratory# 2236, using U S Environmental Protection Agency(USEPA) <br /> Test Method 8260B for benzene, toluene, ethylbenzene, xylene, and total petroleum <br /> hydrocarbon as gasoline Additional scans for oxygenates and lead scavengers were completed <br /> with the 8260B analysis as follows <br /> Methyl Tertiary Butyl Ether (MTBE) <br /> Di-isopropyl Ether(DIPE) <br /> Ethyl Tertiary Butyl Ether (ETBE) <br /> Tertiary Amyl Methyl Ether (TAME) <br /> Tertiary Butanol (TBA) <br /> Methanol (M) <br /> Ethanol (E) <br /> 1,2- Dichloroethane (1,2-DCA) <br /> 1,2- Dibromoethane (1,2-EDB) <br /> Copies of the analytical laboratory reports and chain of custody documentation are attached to <br /> this report as Appendix 3 and the analytical results tabulated in the attached Table 3 and 4 <br /> 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 <br /> unconfined conditions (Environmental Forensic Investigations, 2002) On April 1, 2003 the <br /> highest point measured from the monitoring wells was 8 36 feet (msl) and occurred in <br /> monitoring well PT-MW-2 The lowest elevation of the groundwater surface measured from <br /> the monitoring wells was 8 31 feet (msl) and occurred in monitoring well PT-MW-3 A <br /> summary hydrograph for monitoring well PT-MW-1 is presented as Figure 5 <br /> The average depth to groundwater surface in the eight monitoring wells was approximately 45 <br /> feet below ground surface (bgs) The groundwater surface has risen an average of 6 to 6 5 feet <br /> since the last monitoring event (October 20, 1994) <br /> Electrical conductivity concentrations in the monitoring well water samples were determined to <br /> range from 200 to 400 umbos/cm This low-conductivity value is typical of reported electrical <br /> conductivity values of local groundwaters found near the Mokelumne River(Figure 2) <br /> Concentrations of electrical conductivity in waters from the Mokelumne River are reported to <br /> range from 200 to 350 umhos/cm because the relative short distance from watershed source in <br /> the Sierra Nevada and Quaternary alluvial terrain the waters traverse (Page, 1986) <br /> 40 <br /> Main\,D\EnVironmentaEWarmarTexaco\Reports'\041403QMR wpd 4 <br />