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TO 1 <br /> Groundwater Monitoring Data <br /> ARCO Service Station No. 2130 Page 8 of 8 <br /> 7906 North EI Dorado Street, Stockton, California <br /> Well Elevation Static Water Groundwater Ethyl- Total <br /> Number Date Top of Castrip Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE Observations <br /> MW-10 03/24/97 1438 5300 4377 -2939 <500*** <5** <0 8** <0 5 <0 5 <7** No FP, No S <br /> MW-10 05/20/97 1438 5300 4420 -2982 460 <5** <0 5 <0 5 <0 5 <7** No FP, No S <br /> VW-1 05/20/97 NM 4416 NE 340,000 330 540 2,100 13,000 <1,200* No FP,No S <br /> VW-7 05/20/97 NM 45 05 NE 56 0 6 <0 5 <0 5 08 4 No FP,No S <br /> VW-8 05/20/97 NM 4481 NE 25,000 480 290 260 3,900 <120* No FP,No S <br /> VW-12 05/20/97 NM 4378 NE 1,500 150 1 58 <1* <6* No FP, No S <br /> Analytical results in parts per billion(ppb) <br /> Measurements in feet <br /> Datum in mean sea level <br /> Static water level measured in feet below top of casing <br /> =Well not survey ed <br /> <=Below detection limn for the anal)tic methods used <br /> *=Raised method reporting limit(MRL)due to high analyte concentration requiting sample dilution <br /> **=Raised MRL due to matrix interference <br /> ***=The sample contains discrete non-fuel components eluting in[he gasoline range,quantified as gasoline The <br /> chromatogram does not match the typical gasohne fingerprint <br /> 1=Not sampled as u ell is scheduled to be abandoned <br /> =JTrip Blank <br /> NE=Not evaluated FP=Free Product NA=Not Anal zed S =Sheen <br /> N\x ls\0805M 1409"2697M]XLS <br /> Sheet] Emcon <br /> 8/8197 <br />