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Me 1 <br /> I <br /> Groundwater Monitoring Data <br /> ARCO Service Station No 2130 Page 8 of 8 <br /> 7906 North El Dorado Street, Stockton, California <br /> Well Elevation Static Water Groundwater Ethyl- Total <br /> Number Date Top of Casing Lop 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 -29 82 460 <5** <0 5 <0 5 <0 5 <7** No FP, No S <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 /> VW-1 05/20/97 NM 44 16 NE 340,000 330 540 2,100 13,000 <1,200* No FP, No S <br /> VW-7 05/20/97 NM 4505 NE 56 0 6 <0 5 <0 5 0 8 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 05/20/91 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 hea 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 limit(MRL)due to high analyte concentration requiring sample dilution <br /> **=Raised MRL due to matnx interference <br /> ***=The sample contains discrete non-fuel components eluting in the gasoline range,quantified as gasoline The <br /> chromatogram does not match the typical gasoline fingerprint <br /> '1=Not sampled,as well is scheduled to be abandoned <br /> B=Trip Blank <br /> E=Not evaluated FP=Free Product NA=Not Analyzed S =Sheen <br /> N Ws1080511140SW92997M1 XLS <br /> EMGON <br /> 11!7!97 <br />