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Ta <br /> Groundwater Monito ngand Analytical Results <br /> Chevron Service Station#9-8264 <br /> 3775 Tracy Boulevard <br /> Tracy,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to May 18,2000,were compiled from reports prepared by Blaine Tech Services,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/Not Analyzed <br /> (msl)=Mean sea level X=Xylenes <br /> DTW=Depth to Water MTBE=Methyl tertiary butyl ether <br /> SPHT=Separate Phase Hydrocarbon Thickness <br /> TPH-D=Total Petroleum Hydrocarbons as Diesel <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <br /> I Chromatogram pattern indicated an unidentified hydrocarbon <br /> 2 Insufficient preservative to reduce the sample pH to less than 2 Sample was analyzed within 14 days of sampling,but beyond the 7 days <br /> recommended for Benzene,Toluene,and Ethylbenzene <br /> TOC elevation altered due to casing repairs <br /> Laboratory report indicates gasoline C6-C12 <br /> s Laboratory report indicates unidentified hydrocarbons<C16 <br /> s Diesel data for MW-1 is not available because there was not enough sample for extraction <br /> 7 Laboratory report indicates unidenttfied hydrocarbons C9-C24 <br /> a MTBE by EPA Method 8260 <br /> 4 Laboratory report indicates second highest MTBE concentration was confirmed by 8260 Initial BTEX analysis indicated that this well appeared to <br /> have the highest MTBE concentration <br /> 9-8264 xis/4386854 6 As of OS/17/01 <br />