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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No. 2130 <br /> 7906 N. El_ Dorado Street, Stockton, CA <br /> TPHg=Total petroleum hydrocarbons as gasoline(reported as gasoline range organics(GRO)(C4-C12 as of 4/1/2004)in the analytical report) <br /> TPHd=Total petroleum hydrocarbons as diesel(reported as diesel range organics(DRO)(C10-C36 as of 411/2004)in the analytical report) <br /> DO=dissolved oxygen(post purge value) <br /> TOC=Top of Casing <br /> pg/L=Analytical results in micrograms per liter. <br /> mg/L=milligrams per liter <br /> P/NP=purged/not purged <br /> MtBE=methyl tert-butyl ether <br /> MtBE was analyzed using USEPA Method 8020. <br /> TOC=Top of Casing <br /> msl=mean sea level <br /> bgs=below ground surface <br /> <=Below detection limit 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 8260B. <br /> [3]Chromatogram Pattern Weathered Gasoline C6-C12 <br /> [4]Benzene,toluene,ethylbenzene and total xylenes were analyzed using USEPA Method 82608. <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 numerical 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 may or 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:April 25,2005 Page 23 of 23 <br />