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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2093 <br /> i <br /> 3425 Tracy Blvd, Tracy, CA <br /> TPHg=Total petroleum hydrocarbons as gasoline(reported as gasoline range organics(GRO)(C4-C12 as of 4/112004)in the analytical report) <br /> TPHd=Total petroleum hydrocarbons as diesel(reported as diesel range organics(DRO)(C10-C36 as of 41112004)in the analytical report) <br /> MtBE=Methy!tert-butyl ether <br /> DO=Dissolved oxygen(post purge value) <br /> TOC=Top of Casing <br /> msl=mean sea level <br /> bgs=below ground surface <br /> pglL=micrograms per liter <br /> mg/L=milligrams per liter <br /> PINP=purged/not purged <br /> TBA =Trip Blank <br /> *=analyzed using EPA Method 8260E <br /> "=Groundwater elevation correction factor=(TQC-DTW)+(Free product thickness x 0 77)(approximate specific gravity of gasoline) <br /> <=below given laboratory detection limit <br /> —=not measured or analyzed(in case of product thickness,none found) <br /> (a)=top of casing altered and casing not resurveyed,water-level measured from highest point of casing <br /> [i]=Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> Beginning 2nd quarter 2002 the analytical data validation is summarized in the text <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 /> I <br /> Report Date March 21,2005 Page 27 of 27 <br />