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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No. 548 <br /> 1612 W. Hammer Lane, 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 41112004)in the analytical report) <br /> MISE-Methyl tert-butyl ether. <br /> TOC=Top of Casing <br /> DO=dissolved oxygen <br /> bgs=below ground surface <br /> ms]=mean sea level <br /> pg/L=micrograms per liter <br /> mglL=milligrams per liter <br /> P/NP purged/not purged <br /> NA-Not analyzed. <br /> <=Below detection limits used by laboratory. <br /> —=not measured or analyzed <br /> Sample designations: <br /> (34)-Discrete sample depth(feet). <br /> FP-Free product. S- Sheen. D-Obvious product odor. <br /> *-Raised MRL due to matrix interference. <br /> **-The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline;the chromatogram does not match the typical gasoline fingerprint. <br /> **'-Raised MRL due to high analyte concentration requiring sample dilution. <br /> [2]MTBE was analyzed using USEPA Method 8260B. <br /> [3]Hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel, <br /> [4]The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits. <br /> [5]The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits. <br /> 3/11/2004-VW-5S and VW-5D data rejected due to a discrepency during sampling. <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 /> Page 15 of 15 <br /> Report Date:August 13,2004 <br />