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Ta <br /> . Groundwater Monito ngand Analytical Results <br /> Chevron Service Station#9-0557 <br /> 139 South Center Street <br /> Stockton,California <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory analytical results prior to May 17,2000,were compiled from reports prepared by Blaine Tech Services,Inc. <br /> TOC=Top of Casing SPHT=Separate-Phase Hydrocarbon Thickness (ppb)=Parts per billion <br /> (ft.)=Feet TPH-G=Total Petroleum Hydrocarbons as Gasoline ND=Not Detected <br /> GWE=Groundwater Elevation B=Benzene --=Not MeasuredlNot Analyzed <br /> (msl)=Mean sea level T=Toluene QA=Quality Assurance <br /> S.I.=Screen Interval E=Ethylbenzene <br /> (ft.bgs)=Feet Below Ground Surface X=Xylenes <br /> DTW=Depth to Water MTBE=Methyl tertiary butyl ether <br /> ** GWE was corrected for the presence of SPH; correction factor:{(TOC-DTW)+(SPHT x 0.80)]. <br /> i <br /> Fecal coliforms measured in organisms per 100 milliliters(ml). <br /> 2 Chromatogram pattern indicates an unidentified hydrocarbon. <br /> 3 Oxygenates by EPA 8260 and Methanol by EPA 8015 were not detected; see lab report for detection limits. <br /> ° Oxygenates by EPA 8260 were not detected; see lab report for detection limits. <br /> i Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> Laboratory report indicates weathered gasoline C6-C12. <br /> 7 Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons<C6. <br /> S Laboratory report indicates gasoline C6-C12. <br /> 9 Laboratory report indicates constituents were analyzed by EPA Method 8260. <br /> 10 Well development performed. <br /> 11 MTBE by EPA Method 8260. <br /> i <br /> i <br /> i <br /> 9-0557.xlsl#386843 15 As of 11/13/01 <br />