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TABLE I WELL CONCENTRATIONS Shell Oil ?roducts Company 141 N. El Dorado Street Stockton, California W:C #204-7524-1509 Sample Measured Corrected SP 1 TPPH B T E I X MTBE dO dO Comments Date GW Depth (ft) GW Elev (ft) (ft) I (ug/L) ! (ug/L) i (ug/L) (ug/L) I (ug/L) (ug/L) (mg/L) Method RW-1 Top casing elevation (ft) 9487 05-Aug-92 1 3601 5886 000 72 <0 5 <0 5 <0 5 <0 5 NA NA NA 04-Nov-92 3716 1 5771 000 <50 1 <0 5 <0 5 <0 5 <0 5 NA NA NA 09-Feb-93 3580 5907 ' 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA NA 26-May-93 3945 5542 000 77 67 <0 5 33 40 NA NA NA 26-Aug-93 3900 5587 000 <50 ; 30 <0 5 <0 5 <0 5 NA NA NA 22-Nov-93 4228 5259 000 <50 38 <0 5 <0 5 <0 5 NA NA NA 15-Feb-94 I 41 13 5374 000 <50 099 <0 5 <0 5 <0 5 NA NA NA 10-May-94 3570 1117 000 <50 1 29 <0 5 <0 5 <0 5 NA NA NA 16-Aug-94 3329 61 58 000 <50 I <0 5 <0 5 <0 5 <0 5 NA NA NA 14-Nov-94 3390 6097 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA NA 22-Feb-95 31 68 1 6319 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA NA 24-May-95 2814 6673 000 { <50 <0 5 <0 5 <0 5 <0 5 NA NA NA 05-Oct-95 2718 6769 000 <50 06 06 <0 5 <0 5 NA NA NA 15-Nov-95 2752 6735 1 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA NA 27-Mar-96 f 2434 7053 000 <50 <0 5 <0 5 <0 5 + <0 5 NA 32 YSI Meter i 16-May-96 1 2466 7021 000 <50 <0 50 <0 50 <0 50 <0 50 58 43 YSI Meter 23-Aug-96 2390 7097 000 <50 <0 50 I <0 50 1 <0 50 <0 50 <2 5 31 YSI Meter 25-Oct-96 24 48 t 70 39 0 00 <50 1 <0 50 <0 50 1 <0 50 <0 50 <2 5 i 24 I YSI Meter 31-Jan-97 1979 7508 000 <50 <0 50 I <0 50 <0 50 <0 50 <2 5 28 YSI Meter RW-2 I Top casing elevation (ft) 94 46 05-Aug-92 3566 5880 00o 240 <0 5 <0 5 <0 5 <0 5 i NA NA NA 04-Nov-92 3680 5766 0 00 i 110 1 9 <0 5 <0 5 <0 5 NA NA NA F 09-Feb-93 3545 5901 000 140 I 1 9 <0 5 <0 5 <0 5 NA NA NA 26-May-93 3806 1 5640 000 2700 42 140 180 670 NA NA I NA 26-Aug-93 3733 t 5713 000 2600 38 51 160 550 NA NA NA 97369 5