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i ABLE 1 WELL CONCENTRATIONS Shell Oil Products Company 141 N. EI Dorado Street Stocktor, California W"C#204-7524-1509 Sample Measured Corrected SP TPPH B T E X MTBE dO I dO , Comments Date GW Depth (ft) GW Elev (ft) (ft) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (mg/L) ; Method i 25-Oct-96 j 2457 7033 000 <50 <0 50 I <0 50 <0 50 <0 50 i NA* 46 YSI Meterl MTBE by 8260 3 6 ppb 31-Jan-97 19 85 7505 000 <50 <0 50 <0 50 I <0 50 } <0 50 (a) 24 1 YSI Meter MW-4(DUP) 16-May-96 NA I NA NA <50 j <0 50 I <0 50 <0 50 <0 50 15 NA NA } MW-5 ; Top casing elevation (ft) I 9466 05-Aug-92 3473 5993 000 <50 <0 5 I <0 5 <0 5 <0 5 NA I NA NA 04-Nov-92 t 3588 5878 000 <50 <0 5 07 <0 5 1 0 NA NA NA ` 09-Feb-93 3414 6052 000 <50 <0 5 <0 5 I <0 5 <0 5 NA NA NA 26-May-93 3433 6033 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA NA 26-Aug-93 3345 61 21 000 <50 <0 5 061 <0 5 052 NA I NA j NA 22-Nov-93 3460 6006 000 <50 <0 5 <0 5 <0 5 091 1 NA NA i NA 15-Feb-94 3420 6046 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA NA 10-May-94 3270 61 96 000 <50 <0 5 <0 5 1 <0 5 <0 5 NA NA NA I t 16-Aug-94 31 55 6311 000 <50 <0 5 <0 5 I <0 5 I <0 5 NA NA NA i 14-Nov-94a 3220 I 6246 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA 1 NA 22-Feb-95 2924 6542 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA NA 24-May-95 t 2577 _ _68 89 000 <50 <0 5 <0 5 i <0 5 <0 5 NA NA NA 05-00-95 2550 6916 000 <50 1 <0 5 I} 08 <0 5 i <0 5 NA NA i NA I 15-Nov-95 2605 { 6861 000 <50 05 I <0 5 <05 <0 5 NA NA NA 27-Mar-96 r 2278 71 88 000 <50 05 } <0 5 <0 5 } <0 5 NA I 28 YSI Meter,, 16-May-96 23 09 71 57 0 00 <50 <0 50 <0 50 <0 50 <0 50 12 58 1 YSI Meter, 23-Aug-96 2247 7219 000 <50 I <0 50 <0 50 I <0 50 <0 50 44 50 i YSI Meter MTBE by 8260 50 ppb 25-Oct-96 2301 71 65 000 <50 <0 50 <0 50 <0 50 <0 50 68 25 YSI Meter 31-Jan-97 1820 7646 DOD <50 <0 501 <0 50 <0 50 <0 50 (a) 37 YSI Meter} 97369 4