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Groundwater Monitoring and Analytical Results <br /> Chevron Service on#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 Blame Tech Sen Ices, Inc <br /> TOC=Top of Casing B=Benzene TOG=Total Oil&Grease <br /> (ft)=Feet T=Toluene (ppb)=Parts per billion <br /> GWE=Groundwater Elevation E=Ethylbenzene --=Not Measured Mot Analysed <br /> (m-,I)=Mean sea level X=Xylenes QA=Quality Assurance/Trip Blank <br /> DTW=Depth to Water MTBE=Methyl tertiary butyl ether <br /> TPN-G=Total Petroleum Hydrocarbons as Gasoline EDB=Ethylene Dibromide <br /> ' TOC elevations were surveyed in Tuly 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,(Llevation= 11 02) <br /> Chromatogram pattern indicates an unidentified hydrocarbon <br /> Z Chromatogram pattern indicates a gas and unidentified hydrocarbon <br /> 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 /> s Gasoline range concentration reported,peaks are representative of tetrachloroethane and trace amount of gasoline <br /> Laboratory report indicates discrete peaks <br /> 7 MTBE by EPA Method 8260 <br /> MTBE by EPA Method 8260 was analyzed outside the EPA recommended holding time <br /> 9 Survey data unavailable <br /> 1D BTEX and MTBE by EPA Method 8260 <br /> " Laboratory report indicates the reported value for Toluene is suspected system contamination <br /> 'Z TOC has been altered unable to determme GWE <br /> i <br /> 9-6171 x1s/#38512 f 21 As of 10111/04 <br />