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T�1 <br /> Groundwater Monitoring ata and Analytical Results f r <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 /> TOC=Top of Casing B=Benzene (ppb)=Parts per billion <br /> DTW=Depth to Water T=Toluene ND=Nat Detected <br /> (ft)=Feet E=Ethylbenzene =Not Measured/Not 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 ms]) <br /> I Laboratory report indicates the hydrocarbons detected did not appear to be diesel <br /> 2 TPH-D+B17 analysis with silica gel clean-up <br /> 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 /> i MTBE by EPA Method 8260 <br /> 6 Detection limit raised Refer to analytical reports <br /> 7 Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> s Laboratory report indicates unidentified hydrocarbons<C14 and>C16 <br /> 9 Laboratory report indicates diesel and unidentified hydrocarbons<C17 <br /> �n Laboratory report indicates diesel and unidentified hydrocarbons<C15 <br /> itI <br /> Laboratory report indicates unidentified hydrocarbons>C16 <br /> 12 Laboratory report indicates unidentified hydrocarbons C19-C22 <br /> 11 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 14 Laboratory report indicates gasoline C6-C12 <br /> 1s Well development performed <br /> 16 Laboratory report indicates discrete peaks <br /> 17 Laboratory report indicates weathered gasoline C6-C12+unidentified hydrocarbons C6-Cl 2 <br /> 19 TPH-D with silica gel cleanup <br /> E9 Laboratory report indicates the result for this hydrocarbon is elevated due to the presence of single analyte peak(s)in the quantitation range <br /> 20 Although requested on the Chain of Custody,laboratory did not run analysis with silica gel cleanup <br /> 0123 xis/#280047 6 As of 03/21/01 <br />