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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> FormeriChevron Service Statton#9-0557 <br /> 139 South Center Street <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to May 17,2001,were compiled from reports prepared by Blaine Tech Services, inc <br /> TQC=Top of Casing SPHT=Separate-Phase Hydrocarbon Thickness (ppb)=Parts per billion <br /> (ft}=beet TPH-G=Total Petroleum Hydrocarbons as Gasoline ND=Not Detected <br /> GWE=Groundwater Elevation B=lBenzene --ii Not Measured/Not Analyzed <br /> (msl)=Mean sea level T=(Toluene QA—Quality AssurancefTnp Blank <br /> S i =Screen Interval E=Ethylbenzene <br /> (ft bgs)=Feet Below Ground Surface X=IXylenes <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 10/0 1/0 1 1 <br /> ** GWE was corrected for the presence of SPH, correction factor [(TOC-DTW}+(SPHT x 0 80)) <br /> 1 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, seeI lab report for detection limits <br /> 4 Oxygenates by EPA 8260 were not detected, see lab report for detection limits <br /> 3 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 6 Laboratory report indicates weathered gasoline C6-C12 <br /> 7 Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons<C6 <br /> 8 Laboratory report indicates gasoline C6-C12 <br /> i <br /> 4 Laboratory report indicates constituents were analyzed by EPA Method 8260 <br /> 10 Well development performed <br /> 1 i MTBE by EPA Method 8260 <br /> 12 Data provided by Secor international,Inc Samples were collected prior to initiation of ozone spargmg(baseline samples) Wells were not purged <br /> prior to collection of samples <br /> 13 BTEX and MTBE by EPA Method 8260 <br /> I <br /> 14 Laboratory report indicates the concentration reported exceeded the calibration range of the instrument and is therefore estimated <br /> 16 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 /> 9-0557086843 , 01/10/04 <br />