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T� • <br /> Groundwater Monitormg�ata1 and Analytical Results <br /> Chevron Service Station 99-8264 <br /> 3775 Tracy Boulevard <br /> Tracy,California r <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 TPH-G=Total Petroleum Hydrocarbons as Gasoline SVOCs=Semivolatile Organic Compounds <br /> (ft)=Feet B=Benzene VOCs=Volatile Organic Compounds <br /> GWE=Groundwater Elevation T=Toluene (ppb)=Parts per billion <br /> (msl)=Mean sea level E=Ethylbenzene --=Not Measured/Not Analyzed <br /> DTW=Depth to Water X=Xylenes QA=Quality Assurance/Trip Blank <br /> SPHT=Separate Phase Hydrocarbon Thickness MTBE=Methyl tertiary butyl ether <br /> TPH-D=Total Petroleum Hydrocarbons as Diesel TOG=Total Oil and Grease <br /> I Chromatogram pattern indicated an unidentified hydrocarbon <br /> 2 <br /> Insufficient preservative to reduce the sample pH to less than 2 Sample was analyzed within 14 days of sampling,but beyond the 7 days recommended <br /> for Benzene,Toluene and Ethylbenzene <br /> 3 TOC elevation altered due to casing repairs <br /> 4 Laboratory report indicates gasoline C6-C12 <br /> 5 Laboratory report indicates unidentified hydrocarbons<C16 <br /> 6 Diesel data for MW-1 is not available because there was not enough sample for extraction <br /> Laboratory report indicates unidentified hydrocarbons C9-C24 <br /> 8 MTBE by EPA Method 8260 <br /> 9 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 /> 1° Laboratory report indicates discrete peaks <br /> I i BTEX and MTBE by EPA Method 8260 <br /> 1 <br /> 2 Laboratory report indicates the observed sample pattern is not typical of diesel/#2 fuel oil <br /> i <br /> 9-8264 xW#386854 1 As of 10/27/03 <br />