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Ta •Groundwater Monitoring and 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 B=Benzene (ppb)=Parts per billion <br /> DTW=Depth to Water T=Toluene --=Not Measured/Not Analyzed <br /> (ft)=Feet E=Ethylbenzene ND = Not Detected <br /> S I =Screen Interval X=Xylenes <br /> (ft bgs)=Feet Below Ground Surface MTBE=Methyl tertiary butyl ether <br /> GWE=Groundwater Elevation <br /> (ms)=Mean sea level <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <br /> * TOC elevations are based on City of Stockton Benchmark#9 A brass disk in monument box marking the east 114 comer of section 8 Township to North range 6 East <br /> I MTBE by EPA Method 8260 <br /> 2 Laboratory report indicates gasoline C6-C12 <br /> Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> I <br /> i <br /> i <br /> 08671 xls/#180198 3 As of 01/31/01 <br />