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Table 1 F <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 6020 <br /> 1711 E Yosemite Avenue, Manteca, CA <br /> TPHg=Total petroleum hydrocarbons as gasoline(reported as gasoline range organics(GRO)(C4-C12 as of 41112004)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 /> MtBE=Methyl tert-butyl ether <br /> TOC=Top of Casing <br /> DO=Dissolved oxygen(post purge value) <br /> bgs=below ground surface <br /> mst=mean sea level <br /> ,vglL=micrograms per liter <br /> mglL=milligrams per liter <br /> P/NP=purged/not purged <br /> <=below given laboratory detection limits <br /> --=not measured or analyzed <br /> TB-1 QCTB(trip blank) <br /> =MtBE by EPA Method 8260E <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 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 refected due to identification or other analytical Issues <br /> NO=Not detected above reported detection limit <br /> Report Date December 20,2004 Page 5 of 5 <br />