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�aUie 1 <br /> • Groundwater Monitoring Dond Analytical Results . <br /> Former Chevron Sery tation#9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> I <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 /> TOC=Top of Casing SPHT=Separate-Phase Hydrocarbon Thickness (ppb)=Parts per billion <br /> {ft)=Feet TPH-G=Tota] Petroleum Hydrocarbons as Gasoline <br /> ND=Not Detected <br /> GWE=Groundwater Elevation B f Benzene --=Not Measured/Not Analyzed <br /> (msl)=Mean sea level T=Toluene QA=Quality Assurances rip Blank <br /> S I =Screen Interval E=£thylbenzene <br /> (ft bgs)=Feet Below Ground Surface X=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 10/01/01 <br /> * GWE was corrected for the presence of SPH, correction factor [(TQC-DTW)+(SPHT x 0 80)] <br /> Fecal coliforms measured in organisms per 100 milliliters(ml) j <br /> z Chromatogram pattern indicates an unidentified hydrocarbon <br /> i 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 tab report for detection limits <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 6 Laboratory report indicates weathered gasoline C6-C12 <br /> 7 Laboratory report indicates gasoline C6-C 12+unidentified hydrocarbons<C6 <br /> 8 Laboratory report indicates gasoline C6-Cl2 <br /> 9 Laboratory report indicates constituents were analyzed by FPA Method 8260 <br /> 10 Well development performed <br /> 1 MTBE by EPA Method 8260 <br /> 12 Data provided by Secor International Inc Samples Frere collected prior to initiation of ozone sparging(baseline samples) Wells were not purged <br /> prior to collection of samples <br /> 19 BTEX and MTBE by EPA Method 8260 <br /> i <br /> q4 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 xls/4386843 23 As of 06/17/05 <br />