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• T2 <br /> Groundwater Monitorin a 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 TPH-G=Total Petroleum Hydrocarbons as Gasoline TOG=Total Oil&Grease <br /> (ft)=Feet B=Benzene (ppb)=Parts per billion <br /> GWE=Groundwater Elevation T=Toluene --=Not Measured/Not Analyzed <br /> (msl)=Mean sea level E=Ethylbenzene (R)=Re-analysis <br /> S I =Screen Intervals X=Xylenes QA=Quality Assurance/Trip Blank <br /> (t3 bgs)=Feet Below Ground Surface MTBE=Methyl tertiary butyl ether <br /> DTW=Depth to Water EDB=Ethylene Dibromide <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 Benjamin Holt Drive,(Elevation= H 02) <br /> i Chromatogram pattern indicates an unidentified hydrocarbon <br /> 2 Chromatogram pattern indicates a gas and unidentified hydrocarbon <br /> 3 Confirmation run <br /> 4 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 /> B MTBE by EPA Method 8260 was analyzed outside the EPA recommended holding time <br /> 9 Survey data unavailable <br /> 10 BTEX and MTBE by EPA Method 8260 <br /> 11 Laboratory report indicates the reported value for Toluene is suspected system contamination <br /> 12 TOC has been altered,unable to determine GWE <br /> 13 Laboratory report indicates the observed sampled pattern is not typical of gasoline <br /> 14 Split sampled with Levine Fricke <br /> 9-6171 xls/#385121 1 As of 12/12/05 <br />