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Ta& --- 0 <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco (Circle K) Unit#11205 <br /> 16470 Cambridge Street <br /> Lathrop, California <br /> F.XPLANATiON3. <br /> Groundwater monitoring data and laboratory results prior to January 25, 1999, 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 = Ethylbenzene -- = Not Measured/Not Analyzed <br /> GWE = Groundwater Elevation X = Xylenes <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline MTBE = Methyl tertiary butyl ether <br /> * TOC elevations have been surveyed relative to the San Joaquin County Benchmark No UV-34 <br /> i Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> z Detection limit raised Refer to analytical results <br /> 3 MTBE by EPA Method 8260 <br /> ` Laboratory report indicates gasoline and unidentified hydrocarbons >C10 <br /> 5 MTBE by EPA Method 8260 analyzed past hold time by 20 minutes <br /> 6 MTBE by EPA Method 8260 analyzed past hold time by 59 minutes <br /> I <br /> 1205 xis/181183 3 As of 07t16199 <br />