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. Ta <br /> Groundwater Monitoring*and Analytical Results • <br /> Former Chevron Service Station#9-8632 <br /> 575 Grant Line Road <br /> Tracy,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to June 26,2000,were compiled from reports prepared by Blaine Tech Services,Inc <br /> i <br /> TOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline TOG=Total Oil and Grease <br /> (ft)=Feet B=Benzene (ppb)=Parts per billion <br /> GWE=Groundwater Elevation T=Toluene NP=No Purge <br /> (ms])=Mean sea level E=Ethylbenzene --=Not Measured/Not Analyzed <br /> DTW=Depth to Water X=Xylenes QA=Quality AssurancelTrip Blank <br /> TPH-D=Total Petroleum Hydrocarbons as Diesel MTBE=Methyl tertiary butyl ether <br /> * TOC elevations were re-surveyed on March 19,2002,by Morrow Surveying Previous survey was completed on November 16,2000,by Virgil Chavez Land <br /> Surveying The elevations are based on the data provided by G-R Inc,holding TOC of MW-1 Measurements taken at approximate north side of top of box,top of <br /> casings were marked at location of measurements <br /> I Chromatogram pattern indicates an unidentified hydrocarbon <br /> 2 EPA Method 5520 <br /> 3 Laboratory report indicates gasoline C6-Cl 2 <br /> Laboratory report indicates unidentified hydrocarbons C10-C24 <br /> 5 Laboratory report indicates unidentified hydrocarbons C9-C24 <br /> b Laboratory report indicates unidentified hydrocarbons<C 16 <br /> MTBE by EPA Method 8260 <br /> R Laboratory report indicates discrete peaks <br /> 9 Laboratory report indicates unidentified hydrocarbons>C 16 <br /> 10 Laboratory report indicates hydrocarbon pattern present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> 1 i Laboratory report indicates gasoline <br /> 12 Laboratory report indicates Toluene did not confirm via GCMS <br /> 13 Laboratory report indicates this sample was originally analyzed within holding time Re-analysis for confirmation or dilution was performed past the <br /> recommended holding time <br /> 14 MTBE by EPA Method 8260 was analyzed outside recommended holding time <br /> 15 Due to laboratory error the TPH-D samples for MW-3 and MWA were composited The corresponding result is reported as MW-3 <br /> 16 Analysis with silica gel cleanup <br /> 17 Well development performed <br /> is BTEX by EPA Method 8260 <br /> 19 BTEX and MTBE by EPA Method 8260 <br /> 20 Laboratory report indicates the observed sample pattern is not typical of diesel/#2 fuel oil <br /> 21 Pump in well <br /> 9-8632 xlsl#386855 9 As of 01/30/03 <br />