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l ame i <br /> Groundwater Monitoring and Analytical Results <br /> Former Chevron Se Station#T9-0557 <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,Tne. <br /> TOC=Top of Casing SPHT=Separate-Phase Hydrocarbon Thickness (ppb)=Parts per billion <br /> (Tl)=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=Ethylbenzene <br /> (il.bgs)=Feet Below Ground Surface X=Xylenes <br /> j 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 /> Fccai coliforms measured in organisms per 100 milliliters(ml). <br /> Chromatogram pattern indicates an unidentified hydrocarbon. <br /> 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-C12. <br /> E Laboratory report indicates weathered gasoline C6-C12. <br /> 7 Lahoratory report indicates gasoline C6-C12+unidentified hydrocarbons<C6, <br /> s Laboratory report indicates gasoline C6-C 12. <br /> Laboratory report indicates constituents were analyzed by EPA Method 8260. <br /> 10 Well development performed. <br /> " MTBE by EPA Method 8260. <br /> 1' 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' 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-f1557.x1s!#3R6R43 19 As of 10117/13 <br />