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Table 1 • <br /> Groundwater Monitoring Data a Analytical Results <br /> Former Unocal Service Station#0123 <br /> 1034 Central Avenue <br /> Tracy,California <br /> UMAN TIU <br /> Groundwater monitoring data and laboratory analytical results prior to March 24,1998,were compiled from reports prepared by MPDS Services,Inc <br /> TOC=Top of Casing B=Benzene (ppb)=Parts per billion <br /> UM=Depth to Water T=Toluene ND=Not Detected <br /> (ft)=Feet E=Ethylbenzene --=Not MeasuredlNot Analyzed <br /> GWE=Groundwater Elevation X=Xylenes <br /> (msl)=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 /> 3 MTBE by EPA Method 8260 <br /> 6 Detection limit raised Refer to analytical reports <br /> 7 Laboratory report indicates gasoline and unidentified hydrocarbons C6-C 12 <br /> S 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 /> 11 Laboratory report indicates umdentifted hydrocarbons>C16 <br /> 12 Laboratory report indicates unidentified hydrocarbons C19-C22 <br /> 13 Laboratory report indicates unidentified hydrocarbons C6-Cl2 <br /> 14 Laboratory report indicates gasoline C6-C12 <br /> is Well development performed <br /> 1e Laboratory report indicates discrete peaks <br /> 17 Laboratory report indicates weathered gasoline C6-C12+unidentified hydrocarbons C6-C12 <br /> • • • <br /> 0123 xlst#280047 6 As of 12106/00 <br />