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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco (Circle K) Unit #8671 <br /> 8606 Thornton Road <br /> Stockton, California <br /> RXPr .ANATION4c <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 elevation 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 /> GWE = Groundwater Elevation X = Xylenes <br /> msl = Relative to mean sea level MTBE = Methyl tertiary butyl ether <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 corner of section 8 Township to North range 6 East. <br /> MTBE by EPA Method 8260, <br /> 8671 .xis/#180198 2 As of 05/ 14/99 <br />