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Table '1 <br /> Groundwater Elevation and Analytical Data <br /> Former ARCO Service Station No 2168 <br /> 441 W Charter Way, Stockton, 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 4/1/2004)in the analytical report) <br /> MtBE=Methyl tent-butyl ether <br /> j DO=Dissolved oxygen(post purge value) <br /> TOC=Top of Casing <br /> bgs=below ground surface <br /> msl=mean sea level <br /> pg/L=micrograms per liter <br /> mg/L=milligrams per liter <br /> PINP=purged/not purged <br /> <=below given laboratory detection limits <br /> --=not measured or analyzed <br /> NA =Not analyzed NS=Not sampled NE=Not evaluated <br /> (47)=Discrete sample depth in feet bgs <br /> '=Raised method reporting limit due to high analyte concentration requiring sample dilution <br /> "*=Raised method reporting limit due to matrix interference <br /> MtBE was analyzed using USEPA Method 82608,unless noted otherwise(see below) <br /> [1]=MTBE was analyzed using USEPA Method 8020 <br /> [2]=Water levels collected on 1115/99 samples collected on 12/17/99 due to equipment failure <br /> (3]=Water level collected on 2125100 <br /> [4]=Chromatogram Pattern Gasoline C6-C12 <br /> [5]=Chromatogram Pattern Weathered Gasoline C6-C12 <br /> [6)=Chromatogram Pattern Weathered Gasoline C6-C12+Unidentified Hydrocarbons C6-C12 <br /> [7]=Chromatogram Pattern Unidentified Hydrocarbons C6-C12 <br /> [8]=Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> [9]=Sample was re-analyzed outside of USEPA recommended hold time at a dilution <br /> [10]=The sample was diluted due to the presence of high levels of non-target analytes resulting in below elevated reporting limits <br /> [111=The reported oompound(s)have been confirmed by a second(dissimilar)column or detector <br /> Beginning 6/13102,analytical data validation is provided 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 assoaated 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 September 24,2004 Page 12 of 12 <br />