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1 45 <br /> Groundwater Monttori�ta and Analytical Results <br /> Chevron Service Station#9-6171 <br /> 6633 Pacific Avenue <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to May 22,2000,were compiled from reports prepared by Blaine Tech Services,Inc <br /> TOC=Top of Casing B=Benzene EDB=Ethylene Dtbromide <br /> (ft)=Feet T=Toluene TOG=Total Oil&Grease <br /> GWE=Groundwater Elevation E=Ethylbenzene (ppb)=Parts per billion <br /> (msl)=Mean sea level X=Xylenes Y -W Not Measured/Not Analysed <br /> DTW=Depth to Water MTBE=Methyl tertiary butyl ether QA=Quality Assurance <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <br /> I <br /> * TOC elevations were surveyed in July of 2001,by Morrow Surveying Elevations are based on San Joaquin County Benchmark 12,a brass disc marking <br /> cos monument stamped"1N-4"in monument box on the east side of Pacific Avenue at the approximate centerline Bejamin Holt Drive,(Elevation=11 02) <br /> I i <br /> Chromatogram pattern indicates an unidentified hydrocarbon <br /> 2 Chromatogram pattern indicates a gas and unidentified hydrocarbon <br /> 3 Confirmation run <br /> Laboratory report indicates Bis-(2-Ethylhexyl)-Phthalate was detected at 15 ppb and Butyl-Benzyl-Phthalate was detected at 9 9 ppb <br /> 5 Gasoline range concentration reported,peaks are representative of tetrachloroethane and trace amount of gasoline <br /> 6 Laboratory report indicates discrete peaks <br /> 7 MTBE by EPA Method 8260 <br /> a MTBE by EPA Method 8260 was analyzed outside the EPA recommended holding time <br /> 9 Survey data unavailable <br /> 9-6171 xlst#385121 17 As of 04/11/02 <br />