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�!e i <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco (Unocal) Service Station#5417 <br /> 1700 East Yosemite Avenue <br /> (State Highway 120) <br /> Manteca, California <br /> Groundwater monitoring data and laboratory results prior to November 23, 1998, were compiled from reports prepared by Pacific Environmental Group, Inc <br /> TOC = Top of Casing B = Benzene ppb = Parts per billion <br /> DTW = Depth to Water T = Toluene ND = Not Detected <br /> (ft) = Feet E = Ethylbeiizene - = Not Measured/Not Analyzed <br /> GWE = Groundwater Elevation X = Xylenes <br /> msl =Relative to mean sea level MTBE = Methyl tertiary butyl ether <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 /> 5417 xis/#180179 2 As of 11123198 <br />