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Table I <br /> Groundwater Monitoring Data and Analytical Results <br /> Chevron Service Station#9-8264 <br /> 3775 Tracy Boulevard' -- <br /> Tracy,California <br /> - <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 , <br /> SPHT=Separate Phase Hydrocarbon Thickness MTBE=Methyl tertiary butyl ether <br /> s <br /> TPH-D=Total Petroleum Hydrocarbons as Dies TOG=Total Oil and Grease <br /> ' Chromatogram pattern indicated an uriidentified hydrocarbon. - <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 /> ° Laboratory report indicates gasoline C6-C12. <br /> s Laboratory report indicates unidentified hydrocarbons<C16. <br /> 6 Diesel data for MW-i is not available because there was not enough sample for extraction. <br /> r Laboratory report indicates unidentified hydrocarbons C9-C24. <br /> 8 MTBE by EPA Method 8260. <br /> i4 9 ' <br /> Laboratory report indicates second highest MTBE concentration was confirmed by 8264. Initial BTEX analysis indicated that this well appeared to <br /> have the highest MTBE concentration. n. <br /> 10 Laboratory report indicates discrete peaks. + <br /> s x . <br /> 9-8264.x181#386854 6 As of 04/18/02 <br />