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OBLE I WELL CONCENTRATIONS Shell-branded Service Station 2575 Country Club Boulevard Stockton,California WIC#204-7524-3505 Sample Measured Corrected SP TPPH B T E X MTBE Methanol Comments GW Depth GW Elev Date (ft) (ft) (ft) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) i (ug/L) 1 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 Oxygenate Compounds by 8260 NO except for MTBE 29-Jan-98 620 -641 000 <50 <0 50 <0 50 <0 50 <0 50 120 <1000 i 120 ppb Oxygenate Compounds by 8260 NO except for MTBE 23-Apr-98 530 -551 000 <50 <0 50 <0 50 <0 50 <0 50 38 I <1000 ' 33 ppb Oxygenate Compounds by 8260 ND except for MTBE 29-Jul-98 609 -630 000 <50 052 1 084 <0 50 077 I 95 <1000 1 t 0 ppb Oxygenate Compounds by 8260 NU except or 06-Oct-98 739 -760 000 <50 <0 50 <0 50 <0 50 <0 50 18 <1000 36 ppb MW-7 Top casing elevation (ft) 0 22 E 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 1 <0 50 <2 5 NA 08-Jul-97 880 -858 000 <50 <0 50 <0 50 1 <0 50 <0 50 <2 5 NA 02-Sep-97 987 -965 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 1 VOCs and Oxygenates by 8260 NO Oxygenate Compounds by 8260 ND except for MTBE 02-Dec-97 9 35 I 9 13 D DO <50 1 1 <0 50 <D 50 1 <0 50 25 1 <1000 32 ppb I 29-Jan-98 690 -668 000 <50 <0 50 1 <0 50 1 <0 50 <0 50 <2 5 <1000 Oxygenate Compounds by 8260 NO 23-Apr-98 590 -568 000 <50 i <0 50 <0 50 1 <0 50 <0 50 <2 5 <1000 Oxygenate Compounds by 8260 NO 29-Jul-98 724 -702 000 <50 <0 50 <0 50 <0 50 I <0 50 <2 5 <1000 Oxygenate Compounds by 8260 NO 06-Oct-98 749 i -727 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 Oxygenate Compounds by 8 266-0 MW-8 Top casing elevation (ft) 147 I i 06-Feb-97 780 -633 000 76000 800 6000 3000 12000 1 <1250 NA 02-Apr-97 904 -7 57 1 000 86000 670 ; 5600 3400 ' 16000 7400 NA 08-Jul-97 974 -827 000 70000 700 I 1400 I 2000 8400 30000 NA 2400783 5