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Ta <br /> Groundwater Monitoring a and Analytical Results f <br /> Chevron Service Station#9-0557 <br /> 139 South Center Street <br /> Stockton,California <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory analytical results prior to May 17,2000,were compiled From reports prepared by Blaine Tech Services,Inc. <br /> TQC=Top of Casing B=Benzene (ppb)=Parts per billion <br /> (ft.)=Feet T=Toluene ND=Not Detected <br /> GWE=Groundwater Elevation E=Ethylbenzene =Not Measured/Not Analyzed <br /> (msl)=Mean sea level X=Xylenes(total) <br /> DTW=Depth to Water MTBE=Methyl tertiary butyl ether <br /> SPHT=Separate-Phase Hydrocarbon Thickness <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <br /> ** GWE was corrected for the presence of SPH;correction factor: [(TQC-DTW)+(SPHT x 0.80)]. <br /> t Fecal coliforms measured in organisms per 100 milliliters(ml). <br /> Z Chromatogram pattern indicates an unidentified hydrocarbon. <br /> 3 Oxygenates by EPA 8260 and Methanol by EPA 8015 were not detected;see lab report for detection limits. <br /> 4 Oxygenates by EPA 8260 were not detected; see lab report for detection limits. <br /> s Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> h Laboratory report indicates weathered gasoline C6-C12. <br /> Laboratory report indicates gasoline C6-C 12+unidentified hydrocarbons<C6. <br /> 8 Laboratory report indicates gasoline C6-C12. <br /> 9 Laboratory report indicates constituents were analyzed by EPA Method 8260. <br /> I <br /> 9-0557.xlsl#386843 13 As of 12/04/00 <br />