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TABLE 1 <br /> I <br /> j GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY <br /> I <br /> ARCO Service Station No. 5469 <br /> 130 South Wilson Way, Stockton, California <br /> I <br /> Elevation Top of Well Static Water Groundwater Groundwater Ethyl- Total <br /> Well Top of Casing Screen Level Elevation Flow TPHG Benzene Toluene benzene Xylenes MTBE[l) <br /> Number Date (feet msl) (feet bgs) (feet bgs) (feet msl) Direction pg/L µg/L µg/L µg/L µg/L pg/L <br /> NOTES. <br /> [1]MTBE was analyzed using USEPA Method 8020. TPHG=Total petroleum hydrocarbons as gasoline <br /> [2]MTBE was analyzed using USEPA Method 8260. MTBE=Methyl tert-butyl ether <br /> {31 The value reported exceeds the calibration curve,but not the linear range. NA=Not analyzed <br /> [41 Chromatogram Pattern: Weathered Gasoline C6-C 12. NC=Not calculated <br /> [5)The reporting limits for this sample have been raised due to the high level of a target compound. NS=Not sampled <br /> {61 The reporting limit(s)for this sample have been raised due to high levels of non-target inteferents. msl=mean sea level <br /> (71 Sample was diluted due to high levels of Benzene. bgs—below ground surface <br /> J81 Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel. µg/L=micrograms per liter <br /> [91 Sample was reanalyzed past EPA recommended holding time. <—Below detection limit for the analytical methods used. <br /> i 10)The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits <br /> [l 1]Laboratory report indicates discrete peak at MTBE and Benzene <br /> 1121 Laboratory report indicates discrete peak at MTBE <br /> 1131 The concentration indicated for this analyte is an estimated value above the calibration range of the instrument. <br /> 1141 This sample analyzed beyond the EPA recommended holding time. The results may still be useful for their intended purpose. <br /> (15]Based on notes in laboratory report and conversation with laboratory(11119/02),this TPHG result is due entirely to presence of MTBE. No other compounds eluted in the TPHG range. (Refer to Stratus' <br /> Quarterly Groundwater Monitoring Report,Third Quarter 2002, dated November 20,2002). <br /> [161 The continuing calibration standard was outside of the acceptance criteria. This should be considered in evaluating the result for its intended purpose. <br /> 1171 The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits <br /> [181 Discrete peak @ C6-C7 <br /> I <br /> i <br /> I <br /> STf:ATUS <br /> Arco_5469_Quarterly_Data <br /> 6of6 <br />