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TABLE 1 <br /> GROUNDWATER ELEVATION AND ANALYTICAL DATA <br /> ARCO Service Station No. 548 <br /> 1612 Hammer Lane, Stockton, California <br /> Well Top of Static Top Groundwater Ethyl- Total <br /> Sample Sample Casing Water of Groundwater Flow TPHg Benzene Toluene benzene Xylenes MtBE[1] <br /> Number Date Elevation Level Screen Elevation Direction m m m m ME& mg <br /> Observations <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 /> [1]MTBE was analyzed using USEPA Method 8020. <br /> 12]MTBE was analyzed using USEPA Method 8260. <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 /> 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;tho 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 <br /> 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 <br /> represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample. <br /> R The sample results are rejected due to serious deficiencies in the ability to analyze the sample (i.e.,the presence or absence of the analyte cannot be <br /> verified)or the analyle identification has been rejected(i.e.,the presence of the analyte cannot be verified). <br /> ND Not detected above reported detection limit <br /> K:IWprocess\J5 SP AR001005481Quarterly10548 QMR 2003 11 of 11 <br />