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i TABLE i 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 TPHG Benzene Toluene benzene Xylenes MTBE[1] QA/QC Number Date feet mil feet b s (feet b s) (feet msl Direction Review NOTES: 11..MTBE was analyzed using USEPA Method 8020. TPHG=Total petroleum hydrocarbons as gasoline QA/QC Review: 2]MTBE was analyzed using USEPA Method 8260 MTBF—Methyi ten-butyl ether A—Data accepted without qualification 3]The value reported exceeds the calibration curve,but Oct the linear range NA=Not analyzed 7=Data accepted with qualification A]Chromatogram Pattern- Weathered Gasoline C6-C 12 NC-Not calculated R=Data rejected 5]The reporting limits for this sample have been raised due to the high level of a target compound. NS=Not sampled [6]The reporting lrmtt(s)for this sample have been raised due to high levels of non-target inteferents_ msl=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. pg/L=micrograms per liter 9]Sample was reanalyzed past EPA recommended holding time. <- Below detection limit for the analytical methods used. (10]Tho sample was diluted due to the presence of high levels of target analytes resultmg in elevated reporting limits. 11]Laboratory report indicates discrete peak at MTBE and Benzene. 121 Laboratory report indicates discrete peak at MTBE. 131 Tha 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. [l5]Based on notes in laboratory report and conversation with laboratory(1]/]9/02),this TPHG result is due entirely to presence of MTBE. No other compounds eluted in the TPHG range_ (Refer to Stratus' uarrerdv Groundwarerhlonitonng Report,Third Quarter 2002, dated November 20,2002) 161 The continuing calibration standard was outside of the acceptance criteria. This should be considered in evaluating the result for its intended purpose. It 71 The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits 1 S]Discrete peak O C6-C7 191 Reported result is due to a discrete peak at C5 and has been rejected. 201 Analyte was also reported in the associated laboratory blank as well as in the sample. Result should be considered not detected. 5�A7U5 Areo_5469_Quarterly_Data 9of9