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I <br /> TABLE 1 <br /> GROUNDWATER MONITORING DATA <br /> ARCO Service Station No 2130 <br /> 7906 North El Dorado Street, Stockton, California <br /> Elevation Static Water Groundwater Ethyl- Total <br /> Well Top of Casing Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE <br /> Number Date feet msl feet b s feet b s) (feet msl) L L /L L IL 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 /> 06/20/01 NM NM NE NA NA NA NA NA NA NA <br /> 09/12/01 NM NM NE NA NA NA NA NA NA NA <br /> msl=mean sea level <br /> gs-below ground surface NA=Not analyzed NE=Not evaluated <br /> µgIL=Analytical results in micrograms per liter FP=Free Product <br /> MTBE was analyzed using USEPA Method 8020 S=Sheen <br /> =Below detection limit for the analytic methods used <br /> '=Raised method reporting limit(MRL)due to high analyte concentration requiring sample dilution <br /> **=Raised MRL due to matrix interference <br /> ***=The sample contains discrete non-fuel components eluting in the gasoline range,quantified as gasoline <br /> The chromatogram does not match the typical gasoline fingerprint <br /> i <br /> [11=Not sampled,as well is scheduled to be abandoned <br /> [2]MTBE was analyzed using USEPA Method 8260B <br /> [3]Chromatogram Pattern Weathered Gasoline C6-C12 <br /> [4]Benzene,toluene,ethylbenzene and total xylenes were analyzed using USEPA Method 8260E <br /> [5]Chromatogram Pattern Unidentified Hydrocarbons C6-C12 <br /> [6]Hydrocarbon pattern is present in the requested quantitation range but does not resemble the pattern of the requested fuel <br /> Arco_2130_Quarterly Data XLS Delta <br /> 12 of 12 <br />