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Table 1 <br /> Groundwater,1Monitoring Data and Analytical Results <br /> Former Chevron Service Station#9-0557 <br /> 139 South Center Street <br /> Stockton,California <br /> EXPLANATIONS: <br /> i <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=Separatc-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 /> (msl)=Mean sea level T=Toluene QA=Quality Assurance/Trip Blank <br /> S.I.=Screen Interval E=llEthylbenzene <br /> (ft.bgs)=Feet Below Ground Surface X i�Xylenes <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 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(m]). <br /> z 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 /> a Oxygenates by EPA 8260 were not detected; see lab report for detection limits. <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> G Laboratory report indicates weathered gasoline C6-C 12. <br /> 7 Laboratory report indicates gasoline C6-CI2+unidentified hydrocarbons<C6. <br /> s Laboratory report indicates gasoline C6-C12. <br /> 9 Laboratory report indicates constituents were analyzed by EPA Method 8260. <br /> in Well development performed. <br /> 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 /> 13 BTEX and MTBE by EPA Method 8260. <br /> la Laboratory report indicates the concentration reported exceeded the calibration range of the instrument and is therefore estimated. <br /> 15 11 <br /> Data provided by Secor International,Inc. Wells were not purged prior to collection of samples. <br /> 14 Change to data requested and provided by Secor International,Inc. <br /> 9-0557146843 AO/08/03 <br />