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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Chevron Service Station 49-0557 <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 /> SPH'I'=Se aralcilPhase Hydrocarbon Thickness (ppb)=Parts per billion <br /> TOC=Top of Casing p �` y <br /> (fl)=feet TPI-1-0=Total Petroleum Hydrocarbons as Gasoline ND=Not Detected <br /> GWE=Groundwater Elevation 13=Benzene --=Not Measured/Not Analyzed <br /> V <br /> (msl)=Mean sea level T=Toluene QA=Quality Assuranceff p Blank <br /> S.I.—Screen Interval E_Ethylbenzene <br /> (ft.bgs)=Feet Below Ground Surface X=Xylenes <br /> DTW=Depth to Water MTBE=Methyl iertiary butyl ether <br /> * TQC elevation for MW-l3 was surveyed in dune,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)+(SPH'I'x 0.80)], <br /> Fecal coliforms measured in organisms per 100 milliliters(ml). <br /> 2 Chromatogram pattens indicates an unidentified hydrocarbon. <br /> 3 Oxygenates by EPA 8260 and Methanol by EPA 8015 were not detectedsee lab report for detection limits. <br /> ° Oxygenates by EPA 8260 were not detected.. see lab report for detectionlimits. <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C 12. <br /> ° Laboratory report indicates weathered gasoline C6-C 12. <br /> Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons<C6. <br /> 8 Laboratory report indicates gasoline C6-C 12. <br /> Laboratory report indicates constituents were analyzed by EPA Method 8260. <br /> 10 Well development performed_ <br /> it MTBE by EPA Method 8260. <br /> 12 Data provided by Secor International,Inc. Samples%vere collected prior�o initiation of ozone sparging(baseline samples). Wells were not purged <br /> prior to collection of samples. <br /> " BTEX and MTBE by EPA Method 8260, <br /> 14 Laboratory report indicates the concentration reported exceeded the calibration range of the instrument and is therefore estimated. <br /> is Data Provided by Secor International,Inc. Wells were not purged prior to collection of samples. <br /> *.Xls/4386843 <br /> 46 As of 0 6 <br /> low r M M I <br />