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Table 1 <br /> Groundwater Monitoring Data <br /> 1995 to Present <br /> ARCO Service Station No 2130 <br /> 7905 North EI Dorado Street, Stockton, California <br /> Well Elevation Static Water Groundwater Ethyl- 3 otal <br /> Numbet Date Top of Casing Top o1 Screen Uvel Llevation TPI IG Benzene 1 olut,ne benzene Xylene M FBE-' Observations <br /> VW-12 05/20/97 NM 55 00 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 NL 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 3993 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 /> VW-12 03/16/00 NM 3423 NE NA NA NA NA NA NA NA <br /> VW-12 06/26/00 NM 3668 NC NA NA NA NA NA NA NA <br /> Analytical results in parts per billion(ppb) <br /> MTBE was analyzed using USEPA Method 8020 [2)M7 BE was analyzed using USEPA Method 8260 <br /> Measurements in feet <br /> Datum in mean sea level <br /> Static water level measured in feet below top of casing <br /> --=Well not surveyed <br /> <=Below detection limo for the analytic methods used <br /> *=Raised method reporting hirul(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]=Not sampled as well is scheduled to be abandoned <br /> TB— i n p blank <br /> NE=Not evaluated <br /> FP=Free product <br /> NA=Not analyzed <br /> S=Sheen <br /> C VARCO1213MQTRLY1213Ug200 xis Delta <br /> Page 10 of 10 9119100 <br />