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TABU 1 Groundwater Monitoring and Analytical Data ARCO Service Station No 2130 7906 North E] Dorado Street, Stockton, California Elevation Static Water Groundwater Ethyl Total Well Top of Casing Top of Screen Levet Elevation TPHg Benzene Toluene benzene Xylene MtBE Number Date (feet mil) (ft btc) (ft btc) (feet ms]) mg/L mg/L mg/L mg/L mg/L mg/L Observations MS 3B 12/19/02 NM 41 84 NE 1 200 26 14 27 <050 71[21 NA 316!03 NM 3923 NE 1 100 68 35 71 56 19[2] NA 6/11/2003 NM 3849 NE <50 <0 5 <0 5 <0 5 <0 5 9 4 J[2] NA btc=below top of casing ms)=mean sea fevel bgs=below ground surface NA=Not analyzed NE=Not evaluated mg/L=Analytical results in micrograms per liter FP=Free Product TPI-Ig=Total Petroleum hydrearbons as gasoline S=Sheen MISE=methyl tert butyl ether MtBE was analyzed using USEPA Method 8020 <=Below detection limit for the analytic methods used `=Raised method reporting limit(MRL)due to high analyte concentration requiring sample dilution Raised MRL due to matrix Interference =The sample contains discrete non fuel components eluttng in the gasoline range quantified as gasoline The chromatogram does not match the typical gasoline fingerprint [1J=Not sampled,as well is scheduled to be abandoned [2]MtBE was analyzed using USEPA Method 82608 [3]Chromatogram Pattern Weathered Gasoline C6 C12 [4]Benzene toluene ethylbenzene and total xylenes were analyzed using USEPA Method 82648 [51 Chromatogram Pattern Unidentified Hydrocarbons C6 C12 [6]Hydrocarbon pattern Is present in the requested quantitation range but does not resemble the pattern of the requested fuel Data Qualifier Definitions U The analyte was analyzed for,but was not detected above the sample reporting limit J The analyte was positively identified,the associated numencal value is the approximate concentration of the analyte in the sample N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a"tentative identification" NJ The analysts indicates the presence of an analyte that has been"tentatively identified"and the associated numerical value represents its approximate concentration UJ The analyte was not detected above the reported sample reporting lima However the reported reporting limit is approximate and may or may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample R The sampfe results are rejected due to serious deficiencies In the ability to analyze the sample (i a the presence or absence of the analyte cannot be verified)or the analyte identification has been rejected(I a the presence of the analyte cannot be verified) ND Not detected above reported detection limit K 1WprocessLf5 BP ARC0102130tiQuarterlyl2 QTR 0312130 GWMR 2003 1201 12