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TABLE 1 GROUNDWATER MONITORING DATA ARCO Service Station No 2130 7906 North El Dorado Street, Stockton, California Elevation Static Water Groundwater Ethyl- Total Well Top of Casing Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE Number Date (feet msl) feet b s feet h s (feet msl) L /L !a /L µ IL L /L Observations VW-12 05/20/97 NM 5500 4378 NE 1,500 150 1 58 <1* <6* No FP,No S 09/01/98 NM 4065 NE NA NA NA NA NA NA NA 12/02/98 NM 3766 NE NA NA NA NA NA NA NA 03/31/99 NM 3757 NE NA NA NA NA NA NA NA 06/04/99 NM 3536 NE NA NA NA NA NA NA NA 09/02/99 NM 3993 NE NA NA NA NA NA NA NA 11/29/99 NM 3809 NE NA NA NA NA NA NA NA 03/16/00 NM 3423 Nl~, NA NA NA NA NA NA NA 06/26/00 NM 3668 NE NA NA NA NA NA NA NA 09/28/00 NM 4094 NE NA NA NA NA NA NA NA 12/19/00 NM NM NE NA NA NA NA NA NA NA 03/15/01 NM NM NE NA NA NA NA NA NA NA 06/20/01 NM NM NE NA NA NA NA NA NA NA 09/12/01 NM NM NE NA NA NA NA NA NA NA msl=mean sea level [11=Not sampled,as well is scheduled to be abandoned bgs=below ground surface [2]M I BE was analyzed using USEPA Method 8260B pg/L=Analytical results in micrograms per liter [3]Chromatogiam Pattern Weathered Gasoline C6 C12 MTBE was analyzed using USEPA Method 8020 [4]Benzene,toluene,ethylbenzene and total xylenes were analyzed using <=Below detection limit for the analytic methods used USEPA Method 8260B *=Raised method reporting limit(MRL)due to high analyte concentration requiring sample dilution 151 Chromatogram Pattern Unidentified Hydrocarbons C6 C12 **=Raised MRL due to matrix interference NA=Not analyzed NE=Not evaluated *'*=The sample contains discrete non-fuel components eluting in the gasoline range,quantified as gasoline FP=Free product The ehiomatogram does not match the typical gasoline fingerprint S=Sheen Arco_2130_Quarterly_aata XLS Delta 12 of 12