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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Chevron Service Station#9-0557 <br /> 139 South Center Street <br /> Stockton,California <br /> EXPLANATIONS: 11 <br /> Groundwater monitoring data and laboratory analytical results prior to May 17,200J[,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 Measured/Not Analyzed <br /> IL <br /> (msl)=Mean sea level T=(Toluene QA=Quality Assurance/Trip Blank <br /> S.I.=Screen Interval I-=Ethylbenzene <br /> (ft.bgs)=Feet Below Ground Surface X fXylenes <br /> DTW=Depth to Water MTBE=Methyl tertiary butyl ether <br /> ' TOC elevation for MW-13 was surveyed in June,2002,using the previous benchmark. TOC elevations are based on City of Stockton Benchmark No.28. <br /> Survey was performed by Morrow Surveying on 10/01/01. <br /> ** GWE was corrected for the presence of SPH; correction factor:[(TOC-DTW)+(SPHT x <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; seePab report for detection limits. <br /> 4 Oxygenates by EPA 8260 were not detected; see lab report for detection Iimits. <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> 6 Laboratory report indicates weathered gasoline C6-C12. <br /> Laboratory report indicates gasoline C6-Cl2+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 /> 1 <br /> 1MTBE by EPA Method 8260. <br /> ]Z 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 /> 13 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 /> 15 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 /> 9-0557.06843 A*09/03 <br />