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TAS i WELL CONCENTRATIONS Shell Oil Products Company 2575 Country Club Boulevard St0Lkton,California WIC#204-7524.3505 Sample Measured Corrected SP TPPH B T E X MTBE Me7.hano, Comments GW Depth GW Elev Date (ft) (it) (ft) (ug/L) (ug/L} {ug/L) (ug/L) (ug/L) (ug/L) MW-8Top casing elevation (ft] 147 06-Feb-97 7 80 -6 33 0 00 76000 800 6000 300D 12000 <1250 NA 02 Apr 97 9 04 7 57 0 00 86000 670 5600 3400 16000 7400 NA 08-Jul-97 974 -8 27 000 70000 700 1400 2000 8400 30000 NA VOCs by 8260 ND except for n Butylbenzene 360, sec-Butylbenzene 100,Ethylbenzene 2100, Isoproplybenzene 210 Naphthalene 280,n Propylbenzene 790,Toluene 720, 1 2,4- Tnmethylbenzene 5100,1,3,5-Tnmethylbenzene 1500,Xylenes 9400 Ail in ppb 02-Sep-97 1 1074 NA 000 1 83000 1 530 590 1700 8600 6700 <10000 Oxygenates by 8260 ND except for MTBE 420 ppb -ILOxygenate Compounds by 826D ND except{or 02-Dec-97 1108 -96 000 430000 3700 900 2600 9000 7100 <10000 MTBE 254 ppb M{ly.g Top casing elevation (ft) 1 27 02-Dec-97F-1082 -9 55 0 00 <50 <0 50 <0 50 <0 50 1 <0 50 <2 5 <1000 Oxygenate Compounds by 8260 all ND 202mDec-97 1 0 00 asing elevation (ft) -015 595 -61 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 Oxygenate Compounds by 8260 all ND MW ca -11 Top sing elevation (ft) 102 02-Dec-97 1000 -8 98 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 Oxygenate Compounds by 8=ND all MW-12 Top casing elevation (ft) 339 Oxygenate Compounds by 8260 all ND except for 24-Dec-97 1367 -1028 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 Ethanol 38000 ppb MW-13 Top casing elevation (1t) 1 14 24-Dec-97 i3 33 -12 19 0 00 <50 <0 50 <0 50 <0 50 2 6 <2 5 <100D Oxygenate Compounds by 8260 all ND MW-13(DUP) 24-Dec-g7 NA NA 0 00 <50 <0 50 <0 50 <0 50 2 6 <2 5 <1000 Oxygenate Compounds by 8260 all NO MW-14 ITop casing elevation (ft) 135 23-DBC-97 14 87 -13 52 0 00 <50 <0 50 <0 50 <0 50 0 63 <2 5 <1000 Oxygenate Compounds by 6260 all ND 4 240-0783