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i <br /> TA* 1 • <br /> GROUNDWATER MONITORING DATA <br /> ARCO Service Station No 2130 <br /> 7906 North El Dorado Street, Stockton, California <br /> Elevation Static Water Groundwater I Ethyl- Total <br /> Well Top of Casing Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE <br /> Number Date feet rnsl feet b s ___(Leet b s feet ms] IL L L IL /L µ L Observations <br /> VW-12 05/20/97 NM 5500 4378 NE 1,500 150 1 58 <1* <6* No FP,No S <br /> 09/01/98 NM 4065 NE NA NA NA NA NA NA NA <br /> 12/02/98 NM 3766 NE NA NA NA NA NA NA NA <br /> 03/31/99 NM 3757 NE NA NA NA NA NA NA NA <br /> 06/04/99 NM 3536 NE NA NA NA NA NA NA NA <br /> 09/02/99 NM 3993 NE NA NA NA NA NA NA NA <br /> 11/29/99 NM 38 09 NE NA NA NA NA NA NA NA <br /> 03/16/00 NM 3423 NE NA NA NA NA NA NA NA <br /> 06/26/00 NM 3668 NE NA NA NA NA NA NA NA <br /> 09/28/00 NM 4094 NE NA NA NA NA NA NA NA <br /> 12/19/00 NM NM NE NA NA NA NA NA NA NA <br /> 03/15/01 NM NM NE NA NA NA NA NA NA NA <br /> ms]=mean sea level 11]=Not sampled,as well is scheduled to be abandoned <br /> bgs=below ground surface [21 MTBE was analyzed using USEPA Method 8260 <br /> pg/L=Analytical results in micrograms per liter [3]Chromatogram Pattern Weathered Gasoline C6-C12 <br /> MTBE was analyzed using USEPA Method 8020 (41 Benzene,toluene ethylbenzene and total xylenes were analyzed using <br /> <=Below detection limit for the analytic methods used USEPA Method 8260 <br /> *=Raised method reporting limit(MRL)due to high analyte concentration requiting sample dilution NE=Not evaluated <br /> *=Raised MRL due to matrix interference NA=Not analyzed <br /> ***=The sample contains discrete non-fuel components eluting in the gasoline range,quantified as gasoline FP=Free product <br /> The chromatogram does not match the typical gasoline fingerprint S=Sheen <br /> C lARC0121301QTRLY1200012130 Quarterly Data XLS Delta <br /> 12 of 12 514/01 <br />