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Table 1 <br /> Groundwater Monitoring Data <br /> 1995 to Present <br /> ARCO Service Station No. 2130 <br /> 7906 North EI Dorado Street, Stockton, California <br /> Page 8 of 8 <br /> Well Elevation Static Water Groundwater Ethyl- Total <br /> Number Date Top of Casing Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE Observations <br /> VW-8 11/29/99 NM 3914 NE NA NA NA NA NA NA NA <br /> VW-12 05/20/97 NM 5500 4378 NE 1,500 150 1 58 <1* <6* No FP,No S <br /> VW-12 09/01/98 NM 4065 NE NA NA NA NA NA NA NA <br /> VW-12 12/02/98 NM 3766 NE NA NA NA NA NA NA NA <br /> VW-12 03/31/99 NM 3757 NE NA NA NA NA NA NA NA <br /> VW-12 06/04/99 NM 3536 NE NA NA NA NA NA NA NA <br /> VW-12 09/02/99 NM 39 93 NE NA NA NA NA NA NA NA <br /> VW-12 11/29/99 NM 3809 NE NA NA NA NA NA NA NA <br /> Analytical results in parts per billion(ppb) <br /> MTBE was analyzed using USEPA Method 8020 <br /> Measurements in feet <br /> Datum in mean sea level <br /> tabc water level measured in feet below top of casing <br /> ---=Well not surveyed <br /> <=Below detection limit for the analytic methods used <br /> =Raised method reporting limit(MRI.)due to high analyte concentration requiring sample dilution <br /> '*=Raised MRL due to matrix interference <br /> '•*W 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 /> [1]=Not sampled,as well is scheduled to be abandoned <br /> TB=Trip blank <br /> E=Not evaluated. <br /> =Free product. <br /> A=Not analyzed <br /> =Sheen. <br /> CF1C 1ARCHIVE1ARC0121301Q7RLY12130g499 xls fT Corporation <br /> 42/07/2000 <br />