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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2430 <br /> 7906 N EL Dorado Street, Stockton, CA <br /> TPHg=Total petroleum hydrocarbons as gasoline(reported as gasoline range organics(GRO)in the analytical report) <br /> TPHd=Total petroleum hydrocarbons as diesel(reported as diesel range organics(DRO)in the analytical report) <br /> DO=dissolved oxygen(post purge value) <br /> TOG=Top of Casing <br /> pglL=Analytical results in micrograms per liter <br /> mglL=milligrams per liter <br /> P/NP=purged/not purged <br /> MtBE=methyl tert-butyl ether <br /> MtBE was analyzed using USEPA Method 8020 <br /> TQC=Top of Casing <br /> msl=mean sea level <br /> bgs=below ground surface <br /> <=Below detection lima for the analytic methods used <br /> --=not measured or analyzed <br /> "=Raised method reporting limit(MRL)due to high analyte concentration requiring sample dilution <br /> `*=Raised MRL due to matrix interference <br /> `**=The sample contains discrete non-fuel components eluting in the gasoline range,quantified as gasoline <br /> The chromatogram does not match the typical gasoline fingerprint <br /> [1]=Not sampled,as well is scheduled to be abandoned <br /> [2]MtBE was analyzed using USEPA Method 82608 <br /> [3]Chromatogram Pattern Weathered Gasoline C6-C12 <br /> [4]Benzene,toluene,ethylbenzene and total xylenes were analyzed using USEPA Method 8260B <br /> [5]Chromatogram Pattern Unidentified Hydrocarbons C6-C12 <br /> [6]Hydrocarbon pattern Is present in the requested quantitation range but does not resemble the pattern of the requested fuel <br /> NA=Not analyzed <br /> FP=Free Product <br /> S=Sheen <br /> Data Qualifier Definitions <br /> U=The analyte was analyzed for but was not detected above the sample reporting limit <br /> J=The analyte was positively identified,the associated numerical value is the approximate concentration of the analyte in the sample <br /> N=The analysis indicates the presence of an analyte for which there is presumptive evidence to make a tentative identification <br /> NJ=The analysis indicates the presence of an analyte that has been tentatively identified and the associated numencal value represents its approximate concentration <br /> UJ=The analyte was not detected above the reported sample reporting limit However,the reported reporting limit is approximate and mayor may not represent the actual limit of quantitation <br /> necessary to accurately and precisely measure the analyte in the sample <br /> R=The sample results are rejected due to identification or other analytical issues <br /> ND=Not detected above reported detection limit <br /> Report Date August 4,2004 Page 20 of 20 <br />