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. Table <br /> Groundwater Monitoring DaAW 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 /> TOC='I op of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline TOG=Total Oil and Grease <br /> (fi)=feet B=Benzene (ppb)=Parts per billion <br /> GWE=Groundwater Elevation T=Toluene NP=No Purge <br /> (msl)=Mean sea level E=Ethylbenzene --=Not Measured/Not Analyzed <br /> DTW=Depth to Water X=Xylenes QA=Quality Assurance/Trip Blank <br /> TPN-D=Total Petroleum Hydrocarbons as Diesel MTBE=Methyl tertiary butyl ether <br /> * TOC elevation,,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 /> Chromatogram pattern indicates an unidentified hydrocarbon <br /> 2 EPA Method 5520 <br /> i Lahoratory report indicates gasoline C6-C12 <br /> Laboratory report indicates unidentified hydrocarbons C 10-C24 <br /> ` Laboratory report indicates unidentified hydrocarbons C9-C24 <br /> G Laboratory report indicates unidentified hydrocarbons<C16 <br /> 7 MTBE by EPA Method 8260 <br /> S Laboratory report indicates discrete peaks <br /> v Laboratory report indicates unidentified hydrocarbons>C 16 <br /> !° Laboratory report indicates hydrocarbon pattern present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> ri 1 aboratory report indicate,,gasoline <br /> iZ Laboratory report indicates Toluene did not confirm via GCMS <br /> r` 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 /> 44 MTBE by EPA Method 8260 was analyzed outside recommended holding time <br /> is Due to laboratory error the TPH-D samples for MW-3 and MW-4 were composited The corresponding result is reported as MW-3 <br /> 16 Analysis with silica gel cleanup <br /> 9-8632 x1s1#386855 13 As of 07/30/04 <br />