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I . T 1 WELL CONCENTRATIONS C M Weber Enterprises Property 141 N EI Dorado Street Stockton,California _ WIC#1204-7524-1509 Sample Measured Corrected SP TPPH B T E X MTBE Methanol dO dO I Comments GW Depth 1 GW Elev Date (!t) (ft) (ft) (uglL) (uglL) (ugIL) (ug1L) (uglL) (uglL) (mglL) (mglL) Method RW-1 (UUP) I I 09 Jul 97 1 NA NA NA <50 <0 50 1 <0 50 <0 50 <0 54 1 <25 NA NA NA RW-2 Top casing elevation (ft) 9446 1 1 05-Aug 92 3566 5880 000 240 <0 5 <0 5 1 <0 5 <0 5 NA NA NA NA 04 Nov 92 3680 5766 000 110 1 9 <0 5 <0 5 <0 5 i NA NA NA NA 09 Feb-93 3545 1 5901 i 000 140 1 9 I <0 5 <0 5 <0 5 I NA NA NA NA 26 May 93 1 3806 5640 000 2700 42 1 140 180 670 1 NA NA NA NA 26-Aug 93 3733 5713 ow 2600 38 1 51 160 1 550 1 NA NA NA NA 22-Nov 93 3983 I 5463 000 1500 24 18 84 1 280 1 NA NA 1 NA NA 15-Feb-94 3842 1 5604 0 40 880 92 1 84 65 194 NA NA NA I NA 10 May-94 1 3648 5798 0 00 810 12 64 50 120 NA NA NA NA 16 Aug-94 i 3293 61 53 000 500 16 30 33 1 38 NA NA NA NA 14-Nov 94 3354 6092 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA NA NA 22 Feb 95 1 31 46 6300 000 260 85 1 4 11 23 NA NA NA NA 24 May 95 2864 6582 000 310 9 8 1 9 17 28 NA NA I NA NA 05-Oct 95 1 2768 i 6678 000 140 46 08 90 12 NA NA NA NA 15 Nov-95 2712 6734 000 <50 <0 5 <0 5 <0 5 <05 NA NA l NA NA 27 Mar-96 1 2470 6976 000 1 <50 c4 5 1 <05 <0 5 <0 5 NA NA 60 YSI Meter 16-May-96 2441 7005 000 j <50 <0 50 <0 50 <0 50 <0 50 15 NA 58, YSI Meter 23-Aug 96 I 2360 7086 000 <50 <0 50 <0 50 <050 <0 50 NA NA 42 YSI Meter I 25-Oct 96 2413 1 7033 0 00 78 053 <0 50 <0 50 <0 50 62 NA 29 YSI Meter 31 Jan 97 1940 1 7506 ! 0 00 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA NA NA 02 Apr 97 1 21 06 I 7340 000 <50 <0 50 <0 50 <0 50 <0 50 j <2 5 NA NA NA EPA 8010 Detections 09 Jul-97 1 2099 7347 E 000 <50 <0 50 <0 50 <0 50 <0 50 1 <2 5 NA 1 8 YSI Meter 1 09 Oct 97 21 36 1 7310 000 <50 <4 50 <0 50 1 <0 50 <0 50 60 <1 0 1 8 YSI Meter, All Oxygenate Compounds by 8260 ND except for MTBE 5 6 ppb 13 Jan 98 21 15 1 7331 000 1 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1 0 08 YSI Meter All Oxygenate Compounds by 8260 ND except for MTBE 2 2 ppb 22-Apr-98 1801 7645 000 <50 <0 50 <0 50 <0 50 070 6 6 NA 07 YSI Meter 28-Jul-98 I 1689 7757 000 <50 <0 50 <0 50 <0 50 <0 50 2 8 NA 06 YSI Meter 45-Oct 98 1779 7667 000 <50 <0 50 <0 50 <0 50 <0 50 36 NA 07 YSI Meter RW-2(UUP) { 1 1 I 15 Feb 94 I NA NA NA 1100 12 10 80 220 NA NA NA NA 10 May 94 1 NA NA NA 850 13 68 53 120 NA NA NA NA 16 Aug-94 NA NA NA 450 162 9 13 35 NA NA NA NA 14 Nov-94 NA 1 NA 1 NA <50 1 2 <0 5 <0 5 <0 5 NA NA NA NA 22 Feb 95 1 NA NA NA 270 8 0 I 1 1 10 23 NA NA NA NA 240 0821 6