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i I TABLE 1 GROUNDWATER MONITORING DATA ARCO Service Station No 2130 7906 North EI 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) (ft btc) (ft btc) (feet msl) mg/L mg/L mg/L mg/L mg/L mg/L Observations VW-8 05/20/97 NM 4000 4481 NE 25,000 480 290 260 3,900 <120* No FP, No S 09/01/98 NM 4023 NE NA NA NA NA NA NA NA 12/02/98 NM 3869 NE NA NA NA NA NA NA NA 03/31/99 NM 3750 NE NA NA NA NA NA NA NA 06/04/99 NM 3656 NE NA NA NA NA NA NA NA 09/02/99 NM 4099 NE NA NA NA NA NA NA NA 11/29/99 NM 3914 NE NA NA NA NA NA NA NA 03/16/00 NM 3524 NE NA NA NA NA NA NA NA 06/26/00 NM 3780 NE NA NA NA NA NA NA NA 09/28/00 NM 4203 NE NA NA NA NA NA NA NA 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 NE 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 btc=below top of casing msl=mean sea level bgs=below ground surface NA=Not analyzed NE=Not evaluated mg/L=Analytical results in micrograms per liter FP=Free Product TPHg=Total Petroleum hydrearbons as gasoline MtBE=methyl tert butyl ether MtBE was analyzed using USEPA Method 8020 S=Sheen <=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 k V5 EP ARC012l301Quarter1yl3_QTR 021Arco_2130_3QMR02 100f 11