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Ta <br /> Groundwater Monitoring Waand Analytical Results <br /> Former Unocal Service Station#2859 � <br /> 1665 Pacific Avenue <br /> Stockton, Callforma <br /> Groundwater monitoring data and laboratory analytical results prior to March 6, 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 tertiary butyl ether <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline <br /> # TOC elevations have been surveyed relative to mean sea level <br /> i Laboratory report indicates the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture <br /> Z Laboratory report indicates the hydrocarbons detected did not appear to be gasoline <br /> 3 Detection limit raised Refer to analytical results <br /> 4 MTBE by EPA Method 8260 <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 6 Laboratory report indicates gasoline and unidentified hydrocarbons >C8 <br /> ANALYTICAL AIETHODS. <br /> EPA Method 8015 for TPH(G) <br /> EPA Method 8020 for BTEX and MTBE except where noted <br /> EPA Method 8260 for MTBE where noted <br /> I <br /> 2859 x1s/#280054 9 As of 06/18/98 <br /> I <br />