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Tib I <br /> Groundwater Monito nta and Analytical Results <br /> Chevron Service Station#9-9840 <br /> 4344 Waterloo Road <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to June 22,2000,were compiled from reports prepared by Blaine Tech Services,Inc <br /> TOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline MTBE=Methyl tertiary butyl ether <br /> (ft)=Feet B=Benzene (ppb)=Parts per billion <br /> GWE=Groundwater Elevation T=Toluene <br /> --=Not MeasuredlNot Analyzed <br /> (msl)=Mean sea level E=Eth lbenzene <br /> Y QA=Quality Assurance <br /> DTW=Depth to Water X=Xylenes <br /> I Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons C6-C12 <br /> 2 MTBE by EPA Method 8260 <br /> 3 Laboratory report indicates gasoline C6-C 12 <br /> 4 Laboratory report indicates gasoline <br /> s Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 6 BTEX and MTBE by EPA Method 8260 <br /> 7 Data provided by Secor International,Inc <br /> 9 9840 xW#386846 5 As of 10/04/02 <br />