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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 Weil Top of Casing Screen Level Elevation Flow TPHG Benzene Toluene benzene Xylenes MTBE[l] QA/QC Number Date feet msl feet b s feet b s feet ms]) Direction t Review NOTES: 1]MTBE was analyzed using USEPA Method 6020. TPHG=Total petroleum hydrocarbons as gasoline QAIQC Review: 21 MTBE was analyzed using USEPA Method 8260. MTBE=Methyl ten-butyl ether A=Data accepted without qualification [31 The value reported exceeds the calibration curve,but not the linear range. NA=Not analyzed J-Data accepted with qualification 41 Chromatogram Pattern; Weathered Gasoline C6-C12. NC=Not calculated R=Data rejected [51 The repotting limits for this sample have been raised due to the high level of a target compound. NS-Not sampled 61 The reporting lirmt(s)for this sample have been raised due to high levels of non-target inteferents, ms1=mean sea level 71 Sample was diluted due to high levels of Benzene. bgs=below ground surface ,81 Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel WL=micrograms per liter 91 Sample was reanalyzed past EPA recommended holding time. <=Below detection limit for the analytical methods used. 20]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. 141 This sample analyzed beyond the EPA recommended holding time. The results may still be useful for their intended purpose. 151 Based on notes in laboratory report and conversation with laboratory(11/19102),this TPHG result is due entirely to presence of MTBE. No other compounds eluted in the TPHG range. (Refer to Stratus' Quarterly GroundwaterAfonitonng Report Third Quarter 2002, dated November 20,2002). 16]The continuing calibration standard was outside of the acceptance criteria. This should be considered in evaluating the result for its intended purpose. 171 The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits {18]Discrete peak @ C6-C7 I 5TXATV5 Arco-5469_Quarterly_Data j 6 of 6