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Tabl <br /> Groundwater Monitoring Data 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.1.=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 1/4 comer of section 8 Township to North range 6 Fast. <br /> ' MTBE by EPA Method 8260. <br /> 2 Laboratory report indicates gasoline C6-C12. <br /> 3 Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> 08671.xis/#180198 3 As of 05/26/01 <br />