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TABLE 1 GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY ARCO Service Station No.5469 130 South Wilson Way,Stockton,California Elevation Top of Well Static Water Groundwater Groundwater Ethyl- Total Well Top of Casing Screen Level Elevation Flow GRO+ Benzene Toluene benzene Xylenes MTBE[l] Number Date feet msl feet b s) (feet b s) feet msl) Direction µ L aL Lai1191L µ L L NOTES: +=Results through the first quarter 2004 include purgeable hydrocarbons in the range of C6-C 10. GRO-Gasoline Range Organics QA/QC Review: GRO analyzed using EPA Method 8015B. All other analytes analyzed using EPA Method 8260B. MTBE=Methyl tert-butyl ether A=Data accepted without qualification [1]MTBE was analyzed using USEPA Method 8020. NA=Not analyzed 1—Data accepted with qualification [2]MTBE was analyzed using USEPA Method 8260. NC=Not calculated R=Data rejected [31 The value reported exceeds the calibration curve,but not the linear range. NS=Not sampled [4]Chromatogram Pattern: Weathered Gasoline C6-C 12. msl=mean sea level [5]The reporting limits for this sample have been raised due to the high level of a target compound. bgs=below ground surface [61 The reporting limits)for this sample have been raised due to high levels of non-target inteferents. µi l =micrograms per liter [71 Sample was diluted due to high levels of Benzene. <=Below detection limit for the analytical methods used. [8]Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel. [91 Sample was reanalyzed past EPA recommended holding time. (10)The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits. [11]Laboratory report indicates discrete peak at MTBE and Benzene. [121 Laboratory report indicates discrete peak at MTBE. [13]The concentration indicated for this analyte is an estimated value above the calibration range of the instrument. [l4]This sample was analyzed beyond the EPA recommended holding time. [151 Based on notes in laboratory report and conversation with laboratory(11/19/02),this TPHG result is due entirely to presence of MTBE. No other compounds eluted in the TPHG range. (Refer to Stratus' Quarterly Groundwater Monitoring Report, Third Quarter 2002, dated November 20,2002). L16]The continuing calibration standard was outside of the acceptance criteria. [171 The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits. [18]Discrete peak Qa C6-C7. [191 Reported result is due to a discrete peak at C5 and has been rejected. 1201 Analyte was also reported in the associated laboratory blank as well as in the sample. Result should be considered not detected. 1211 Initial results may be biased high as shown by surrogate recoveries above method acceptance limits(due to matrix interference). Sample re-analyzed outside of EPA recommended hold time. Initial result reported in the table,and should be considered an estimate. [22]Initial result was an estimate,beyond the calibration range of the instrument. Sample re-analyzed beyond the EPA recommended hold time. initial result reported in the table. [231 The reported results may be biased low since the analyses for these analytes were performed beyond the EPA recommended holding time of 14 days. [241 The reported results may be biased low as demonstrated by a low surrogate recovery due to matrix interference. [25]Initial result not confirmed by re-analysis. Re-analysis performed beyond hold time. Initial result reported in the table,should be considered an estimate. [261 The reported result may be biased low as demonstrated by a low surrogate recovery. 5TRAT!!S Arco_5469_Quarterly_Data 9of9