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Table 1 J Groundwater Elevation and Analytical Data ARCO Service Station No 6080 85 E Louise Avenue, Lathrop, 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)(C10-C36 as of 41112004)in the analytical report) MtBE=Methyl tert-butyl ether DO=Dissolved oxygen(post purge value) bgs=below ground surface TQC=Top of Casing ms]=mean sea level pg/L=micrograms per liter mg/L=milligrams per liter P/NP=purged/not purged <=below given laboratory detection limits --=not measured or analyzed Beginning 3/14/2003-TPHg and BTEX analyzed by EPA Method 8260B [1]=Chromatogram Pattern Weathered Gasoline C6-C12+Unidentified Hydrocarbons C6-1312 [2]=Chromatogram Pattern Unidentified Hydrocarbons C6-C12 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 mayor 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 12, 2004 Page 3 of 3