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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2130 7906 N EL Dorado Street, Stockton, CA TPHg=Total petroleum hydrocarbons as gasoline(reported as gasoline range organics(GRO)(C4-C12 as of 41112004)in the analytical report) TPHd=Total petroleum hydrocarbons as diesel(reported as diesel range organics(DRO)(C90-C36 as of 4/112004)in the analytical report) DO=dissolved oxygen(post purge value) TOC=Top of Casing pg/L=Analytical results in micrograms per liter mg/L=milligrams per liter PMR=purged/not purged MtBE=methyl tert-butyl ether MtBE was analyzed using USEPA Method 8020 TOC=Top of Casing msl=mean sea level bgs=below ground surface <=Below detection limit for the analytic methods used --=not measured or analyzed '=Raised method reporting limit(MRL)due to high analyte concentration requiring sample dilution '*=Raised MRL due to matnx interference '*'=The sample contains discrete non-fuel components eluting in the gasoline range,quantified as gasoline The chromatogram does not match the typical gasoline fingerprint [1]=Not sampled,as well is scheduled to be abandoned [2]MtBE was analyzed using USEPA Method 8260B [3]Chromatogram Pattern Weathered Gasoline C6-C12 [4]Benzene,toluene,ethylbenzene and total xylenes were analyzed using USEPA Method 82608 [5]Chromatogram Pattern Unidentified Hydrocarbons C6-C12 [6]Hydrocarbon pattern is present in the requested quantitation range but does not resemble the pattern of the requested fuel NA=Not analyzed FP=Free Product S=Sheen Data Qualifier Definitions U=The analyte was analyzed for,but was not detected above the sample reporting limit J=The analyte was positively identified,the associated numerical value is the approximate concentration of the analyte in the sample N=The analysis indicates the presence of an analyte for which there is presumptive evidence to make a tentative identification NJ=The analysis indicates the presence of an analyte that has been tentatively identified and the associated numerical value represents its approximate concentration UJ=The analyte was not detected above the reported sample reporting limit However,the reported reporting limit is approximate and may or may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample R=The sample results are rejected due to identification or other analytical issues ND=Not detected above reported detection limit Report Date October 25,2004 Page 21 of 21