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• • • <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 nisi feet b s feet b s (feet ms1 IL IL L /L L /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 3809 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 /> ms1=mean sea level [1]—Not sampled,as well is scheduled to be abandoned <br /> gs=below ground surface l2]MTBE was analyzed using US EPA Method 8260 <br /> µg/L=Analytical results in micrograms per liter 13]Chromatogram Pattern Weathered Gasoline C6-C 12 <br /> MTBE was analyzed using USEPA Method 8020 [4]Benzene,toluene,ethylbenzene and total xylenes were analyzed using <br /> =Below detection limit for the analytic methods used USBPA Method 8260E <br /> *=Raised method reporting limit(MRI,)due to high analyte concentration requiting sample dilution l5]Chromatogram Patten Umdentt6ed Hydrocarbons C6-C12 <br /> **=Raised MRL due to matrix interference NA=Not analyzed NE=Not evaluated <br /> ***= <br /> The sample contains discrete non-fuel components eluting to the gasoline range,quantified as gasoline FP=Free product <br /> The chromatogram does not match the typical gasoline fingerprint S=Sheen <br /> C 1ARC0121301QTRLY120001Arco 2130 Quarterly Data XLS Delta <br /> 12 of 12 8124/01 <br />