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TAE I WELL CONCENTRATIONS Shell Oil Products Company 2575 Country Club Boulevard Stockton, California WIC 4204-7524-3505 Sample Measured Corrected SP TPPH BT E X MTBE I Methanol Comments GW Depth GW Elev Date (ft) (ft) (ft) (ug/L) (u9/1-) (ug/L) (u9I1-) (ug/L) (u9/L) L—(U9/L)— MW-6 Top casing elevation (ft) -0 21 I 06-Feb-97 560 -581 000 <50 <0 50 <0 50 <0 50 <0 50 79 NA 01-Apr-97 650 -671 000 <50 <0 50 <0 50 <0 50 <0 50 47 NA 08-Jul-97 774 -795 000 <50 <0 50 <0 50 <0 50 <0 50 75 NA VOCs by 8260 NO,Oxygenates by 8260 ND except for 02-Sep-97 887 NA 000 <50 <0 50 <0 50 <0 50 <0 50 12 <1000 MTBE 11 ppb Oxygenate Compounds by 8260 NO except for MTBE 02-Dec-97 890 -911 000 <50 <0 50 <0 50 <0 50 <0 50 73 <1000 110 ppb I Oxygenate Compounds by 8260 NO except for MTBE 29-Jan-98 620 -641 0 00 <50 <0 50 <0 50 <0 50 <0 50 120 <1000 120 ppb MW-7 Top casing elevation (ft) 0 22 06-Feb-97 604 -582 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 01-Apr-97 752 -730 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 08-Jul-97 880 -858 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 02-Sep-97 987 -965 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 I <1000 VOCs and Oxygenates by 8260 ND Oxygenate Compounds by 8260 NO except for MTBE 02-Dec-97 935 -913 000 <50 1 1 <0 50 <0 50 <0 50 25 <1000 32 ppb 29-Jan-98 690 -668 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 Oxygenate Compounds by 8260 ND MW-8 Top casing elevation (ft) 147 ' 06-Feb-97 780 -633 000 76000 800 6000 3000 12000 <1250 NA 02-Apr-97 904 -757 000 86000 670 5600 3400 16000 7400 NA 08-Jul-97 974 -827 000 70000 700 1400 2000 8400 30000 NA VOCs by 8260 NO 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 All in ppb 02-Sep-97 10 74 NA 000 83000 530 590 1700 6600 6700 <10000 Oxygenates by 8260 NO except for MTBE 420 ppb 240 0783 4