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Groundwater Monitoring Data and Analytical Results <br /> Tosco (Former BP Oil) SS #11195 <br /> 16500 South 1-5 <br /> Lathrop, California <br /> EXPLANATIONS: <br /> TOC = Top of Casing elevation B = Benzene ppb = Parts per billion <br /> DTW = Depth to Water T = Toluene ND = Not Detected <br /> (ft.) = Feet E = Ethylbenzene -- = Not Measured/Not Analyzed <br /> GWE = Groundwater Elevation X = Xylenes <br /> (msi) = Referenced relative to mean sea level MTBE = Methyl tertiary butyl ether <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline <br /> * TOC elevations referenced to cross in sidewalk, run from City of Lathrop Benchmark No.5 (Elevation = 9.22 feet, msl). Prior to May 20, 1999, TOC elevations were <br /> referenced to San Joaquin datum, brass cap W-34 at Mathey Road, 45 feet north and 52 feet west of centerline(Elevation = 12.50 feet above msl). <br /> 1 MTBE by EPA Method 82060. <br /> 2 Laboratory report indicates discrete peak C6. <br /> Historical data pending. When received, data will be included in future reports. <br /> 11195.xls/#180175 3 As of 05/20/99 <br />