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Tal <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 /> 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 /> msl = Relative to mean sea level MTBE = Methyl teitiary 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 /> z TPH(D)analysis with silica gel clean-up <br /> 3 Laboratory report indicates the hydrocarbons detected appeared to be a diesel and non-diesel mixture <br /> ° Laboratory report indicates unidentified hydiOLarbons C9-C24 <br /> 5 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 /> $ Laboratory report indicates unidentified hydrocarbons <C 14 and >C t6 <br /> 4 Laboratory report indicates diesel and unidentified hydrocarbons <C17 <br /> 10 Laboratory report indicates diesel and unidentified hydrocarbons <C15 <br /> 11 Laboratory report indicates unidentified hydrocarbons >C 16 <br /> 12 Laboratory report indicates unidentified hydrocarbons C19-C22 <br /> 13 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 14 Laboratory report indicates gasoline C6-C12 <br /> 0123 xis/#280047 4 As of 09/09/99 <br />