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n 1 L J <br /> Groundwater Monitoringeand Analytical Results <br /> Tosco(Circle K)Unit#08671 <br /> 8606 Thornton Road <br /> Stockton,California <br /> EXPLANATIONS. <br /> Groundwater monitoring data and laboratory analytical results prior to May 14, 1999,were compiled from reports prepared by Secor international, Inc <br /> TOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion <br /> DTW=Depth to Water B=Benzene --=Not Measured/Not Analyzed <br /> (ft)=Feet T=Toluene ND = Not Detected <br /> S i =Screen interval E=Ethylbenzene <br /> (ft bgs)=Feet Below Ground Surface X=Xylenes <br /> GWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether <br /> (msl)=Mean sea level <br /> * TOC elevations are based on City of Stockton Benchmark#9 A brass disk in monument box marking the east 114 corner of section 8 Township to North range 6 East <br /> MTBE by EPA Method 8260 <br /> z Laboratory report indicates gasoline C6-C12 <br /> 3 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> I <br /> 08671 xW#180198 4 As of 11120/01 <br />