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Groundwater Monitoring <br /> TQ <br /> and Analytical Results • <br /> Tosco (Circle K) Unit #1205 <br /> 16470 Cambridge Street <br /> Lathrop, California <br /> EXPLANATIONS. <br /> Groundwater monitoring data and laboratory results prior to January 25, 1999, were compiled from reports prepaied 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 -- W Not Measured/Not Analyzed <br /> GWE = Groundwater Elevation X = Xylenes <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline MTBE = Methyl tertiaiy 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 /> 1205 x18/180183 2 As of 01/25/99 <br />