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ale 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station#0123 <br /> 1034 Central Avenue <br /> Tracy, California <br /> EXPLANATIONS. <br /> Groundwater monitoring data and laboratory analytical results prior to March 24, 1998, were compiled from reports prepared by MPDS Services, Inc <br /> TQC = 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 /> msl = Relative to mean sea level MTBE = Methyl tertiary butyl ether <br /> TPH(D) = Total Petroleum Hydrocarbons as Diesel <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline <br /> * TOC elevations are relative to mean sea level(msl), per City Benchmark No GPS-19(Elevation = 49 00 feet msl) <br /> I Laboratory report indicates the hydrocarbons detected did not appear to be diesel <br /> 2 TPH(D)analysts with silica gel clean-up <br /> 3 Laboratory report indicates the hydrocarbons detected appeared to be a diesel and non-diesel mixture <br /> 4 Laboratory report indicates unidentified hydrocarbons C9-C24 <br /> 5 MTBE by EPA Method 8260 <br /> 6 Detection limit raised Refer to analytical results <br /> l Laboratory report indicates gasoline and unidentified hydrocarbons C6-C 12 <br /> i Laboratory report indicates unidentified hydrocarbons <C14 and >C16 <br /> 9 Laboratory report indicates diesel and unidentified hydrocarbons <C17 <br /> 10 Laboratory report indicates diesel and unidentified hydrocarbons <C15 <br /> n Laboratory report indicates unidentified hydrocarbons <C16 <br /> 0123 xis/#280047 4 As of 03/16/99 <br />