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Table l <br /> F Groundwater Monitoringand Analytical Results • <br /> Former Chevron SeneStation#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 <br /> SPHT=Separate-Phase Hydrocarbon Thickness (ppb)=Parts per billion <br /> {ft.}=Feet <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline ND=Not Detected GWE=Groundwater Elevation _ <br /> B=Benzene -=Not Measured/Not Analyzed <br /> (msl)=Mean sea level <br /> T=Toluene QA=Quality Assurance/Trip Blank <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 /> * TOC elevation for MW-13 was surveyed in lune,2002,using the previous benchmark. TOC elevations are based on City of Stockton Benchmark No.28. <br /> Survey was performed by Morrow Surveying on 10101101. <br /> ** GWE was corrected for the presence of SPH; correction factor:[(TOC-DTW)+(SPHT x 0.80)]. <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 /> 4 Oxygenates by EPA 8260 were not detected; see lab report for detection limits. <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C 12. <br /> 6 Laboratory report indicates weathered gasoline C6-C 12. <br /> 7 Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons<C6. <br /> a Laboratory report indicates gasoline C6-C 12. <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 /> 12 Data provided by Secor International,Inc. Samples were collected prior to initiation of ozone sparging(baseline samples). Wells were not purged <br /> prior to collection of samples. <br /> 17 BTEX and MTBE by EPA Method 8260. <br /> I <br /> 14Laboratory report indicates the concentration reported exceeded the calibration range of the instrument and is therefore estimated. <br /> 's Data provided by Secor International,Inc. Wells were not purged prior to collection of samples. <br /> 16 Change to data requested and provided by Secor International,Inc. <br /> 17 <br /> Analytical result confirmed. <br /> 9-0557.xis/#386843 23 As of 08/29/05 <br />