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Groundwater Monitoring and Analytical Results Chevron Servic ion#9-6171 6633 Pacific Avenue Stockton,California EXPLANATIONS Groundwater monitoring data and laboratory analytical results prior to May 22,2000,were compiled from reports prepared by Blaine Tech Services,Inc TOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline TOG=Total Oil&Grease (ft)=Feet B=Benzene (ppb)=Parts per billion GWE=Groundwater Elevation T=Toluene --=Not Measured/Not Analyzed (msl)=Mean sea level E=Ethylbenzene NP=No Purge S E =Screen Intervals X=Xylenes _(A)=Re-analysis (ft bgs)=Feet Below Ground Surface MTBE=Methyl tertiary butyl ether QA=Quality Assurance/Trip Blank DTW=Depth to Water EDB=Ethylene Dibromide - * TOC elevations were surveyed in July of 2001,by Morrow Surveying Elevations are based on San Joaquin County Benchmark 12,a brass disc marking cos monument stamped"IN-4"in monument box on the east side of Pacific Avenue at the approximate centerline Benjamin Holt Drive,(Elevation=11 02) ' Chromatogram pattern indicates an unidentified hydrocarbon 2 Chromatogram pattern indicates a gas and unidentified hydrocarbon ' Confirmation run 4 Laboratory report indicates Bis-(2-Ethylhexyl)-Phthalate was detected at 15 ppb and Butyl-Benzyl-Phthalate was detected at 9 9 ppb i Gasoline range concentration reported,peaks are representative of tetrachloroethane and trace amount of gasoline _ 6 Laboratory report indicates discrete peaks _ ' MTBE by EPA Method 8260 s MTBE by EPA Method 8260 was analyzed outside the EPA recommended holding time 9 Survey data unavailable 10 BTEX and MTBE by EPA Method 8260 " Laboratory report indicates the reported value for Toluene is suspected system contamination 12 TOC has been altered,unable to determine GWE 12 Laboratory report indicates the observed sampled pattern is not typical of gasoline 14 Split sampled with Levine Fricke 9-6171 xls/#385121 23 As of 12112105