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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> Former ARCO Service Station No 4493 <br /> 205 N Center 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 /> MtBE=Methyl tert-butyl ether <br /> nln`=analyzed using EPA Method 8020/EPA Method 82608 <br /> DO=Dissolved oxygen <br /> TOC=Top of Casing <br /> bgs=below ground surface <br /> msl=mean sea level <br /> NgIL=micrograms per liter <br /> mg/L=milligrams per liter <br /> PINP=purgedlnot purged <br /> --=not measured/analyzed or not applicable <br /> <=below given laboratory detection limit <br /> "=analyzed using EPA Method 8260B <br /> 111=Sample was reanalyzed past the EPA recommended holding time <br /> [21=Hydrocarbon pattern is present in the requested fuel quantification range but does not resemble the pattern of the requested fuel <br /> [31=The surrogate recovery for this sample cannot be accurately quantified due to interference form coeluting organic compounds present in the sample extract <br /> Beginning 2nd quarter 2002,an analytical data review summary is included in the text <br /> May 2004-Morrow Surveying resuryed site wells <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 rejected due to identification or other analytical issues <br /> ND=Not detected above reported detection limit <br /> Report Date July 29,2004 Page 8 of 8 <br />