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�Ltoring Table 1 <br /> Groundwater Data and Analytical Results <br /> Former Chevron Service Station#9-0557 <br /> n <br /> 139 South Center Street <br /> f Stockton,California <br /> EXPLANATIONS: f <br /> I` I <br /> Groundwater monitoring data and laboratory analytical results prior to May 17,2I 00,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 /> (ms])=Mean sea level T=Toluene QA=Quality Assurance/l rip Blank <br /> i <br /> S.I.=Screen Interval E=Ethylbenzene <br /> (ft.bgs)=Feet Below Ground Surface X=Xylenes <br /> DTW=Depth to Water MTBE=Metbyl to tiary butyl ether <br /> I <br /> * TOC elevation for M W-13 was surveyed in June,2002,using the previous Ibenchmark. TOC elevations are based on City of Stockton Benchmark No.28. <br /> Survey was performed by Morrow Surveying on 10101101. II <br /> ** GWE was corrected for the presence of SPH; correction factor:[(TOC-D I,W)+(SPHT x 0.80)]. <br /> ' Fecal coliforms measured in organisms per 100 milliliters(ml). <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 /> 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-C12. 19 Laboratory report indicates constituents were analyzed by EPA Method 8260. <br /> '0 Well development performed. <br /> " MTBE 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 /> 1 <br /> 3 BTEX and MTBE by EPA Method 8260. - _- <br /> '" 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 /> 36 Change to data requested and provided by Secor International,Inc. _ <br /> " Analytical result confirmed. <br /> 18 TOC has been damaged;unable to determine an accurate GWE. <br /> 9-0557.6843 A 29105 <br />