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Ta � - <br /> Groundwater Monitoring ffa and Analytical Results <br /> Tosco(Unocal) Service Station#5417 <br /> 1700 East Yosemite Avenue <br /> (State Highway 120) <br /> Manteca, California <br /> EXPLANATIONS. <br /> Groundwater monitoring data and laboratory results prior to November 23, 1998, were compiled from reports prepared by Pacific Environmental Group, Inc <br /> TQC = Top of Casing B = Benzene ppb = Parts per billion <br /> DTV = Depth to Water T = Toluene ND = Not Detected <br /> (ft) = Feet E = Elhylbenzene -- = Not Measured/Not Analyzed <br /> GWE = Groundwater Elevation X = Xylenes <br /> ms] = Relative to mean sea level MTBE = Methyl tertiary butyl ether <br /> i <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline <br /> # TOC elevations have been surveyed relative to mean seal level(msl) <br /> i MTBE by EPA Method 8260 <br /> 2 Detection limit raised Refer to analytical results <br /> 3 Laboratory report indicates weathered gas C8-C12 <br /> 4 Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> i <br /> I <br /> I <br /> i <br /> i <br /> 2 As of 42/22199 <br /> 5417 xls/N180179 <br />