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Table 1 <br /> Gr6undwater Monitoring Data and Analytical Results <br /> FormerliChevron Service Station#9-0557 <br /> 139 South Center Street <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to May 17,200Q,were compiled from reports prepared by Blame Tech Services Inc <br /> FOC=Top of Casing SPHT=Separate-Phase Hydrocarbon Thtckness (ppb)=Parts per billion <br /> (R)—reet TPH-G=Total Petroleum Hydrocarbons as Gasoline ND=Not Detected <br /> GWE=Groundwater Elevation B=(Benzene --if Not Measured/Not Analyzed <br /> (ms1)=Mean sea level T=(Toluene QA=Quality Assurance/Trip Blank <br /> S I =Screen Interval E=IEthylbenzene <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 /> ** G WE was corrected for the presence of SPH, correction factor [(TOC-DTW)+(SPHT x 0 80)) <br /> ' recal coliforms measured in organisms per 100 milliliters(ml) <br /> z Chiomatogram pattern indicates an unidentified hydrocarbon <br /> Oxygenates by EPA 8260 and Methanol by EPA 8015 were not detected see llab report for detection limits <br /> 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 /> Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons<C6 <br /> 8 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 /> " 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 /> is If <br /> 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 x6843 ! A#13/04 <br />