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e 1 • <br /> Page 10 of 10 _ <br /> Groundwater Monitoring Data <br /> ARCO Service Station No. 2130 <br /> 7906 North EI Dorado Street, Stockton, California <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 /> MW-10 08/19/97 1438 5300 4766 -3328 440 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S <br /> MW-10 11/19/97 1438 5300 45 95 -3157 510 2 2 2 2 0 93 3 1 <5 No FP,No S <br /> MW-10 03/04/98 1438 5300 4143 -2705 110 066 <0 5 <0 5 <0 5 <5 No FP,No S <br /> VW-1 05/20/97 NM 4400 4416 NE 340,000 330 540 2,I00 13,000 <1,200* No FP,No S <br /> VW-7 05/20/97 NM 3500 45 05 NE 56 0 6 <0 5 <0 5 0 8 4 No FP,No S <br /> VW-8 05/20/97 NM 4000 4481 NE 25,000 480 290 260 3,900 <120* No FP,No S <br /> VW-12 05/20/97 NM 5500 4378 NE 1,500 150 1 58 <1* <6* No FP,No S <br /> Analytical results in parts per billion(ppb) <br /> TBE was analyzed using USEPA Method 8020 <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 limit for the analytic methods used <br /> *=Raised method reporting Iimit(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 /> 11]=Not sampled,as well is scheduled to be abandoned <br /> B=Trip blank <br /> E=Not evaluated <br /> FP=Free product <br /> A=Not analyzed <br /> =Sheen <br /> N IXLSW8051114091032698RI XLS <br /> Sheet] __e <br /> 05/08/98 <br />