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Taal <br /> Groundwater Monitoring IMa and Analytical Results 0 <br /> Tosco(Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Well ID/ Date DTW GWE TPH(G) B T E X MTBE <br /> TOC* (ft ) (ft ) (ppb) (ppb) (ppb) (pph) (ppb) (ppb) <br /> MW4 07/21/98 28 31 -1668 <50 <0 50 1 8 <0 50 23 181186 <br /> (cont) 10/14/98 2926 -1763 <50 <0 50 <0 50 <0 50 <0 50 141106 <br /> 01125-26199 2847 -1684 <50 <0 50 <0 50 <0 50 <0 50 95/10 <br /> MW-5 02/21/90 - 3 600 77 16 05 17 -- <br /> 10/18/90 DRY <br /> 11/19/90 DRY <br /> 12127190 DRY <br /> 01/28/91 DRY <br /> 04/02/91 DRY -- -- <br /> 07/18/91 DRY <br /> 09/30/91 DRY <br /> 11/14/91 DRY <br /> 04/16/92 DRY <br /> 07/30/92 DRY <br /> 10/21-22/92 DRY <br /> 01/13/93 DRY <br /> 1176 04/26/93 5082 -3906 60,000 28,000 <250 <250 <250 -- <br /> 07/26/93 5181 -4005 43,000 19,000 240 <125 <125 -- <br /> 10/20/93 52 35 -40 59 21,000 15,000 120 <50 68 -- <br /> 01/17-18194 49 83 -3807 23,000 13,000 100 <50 75 -- <br /> 04/25-26/94 4775 -35 99 16,000 12,000 92 31 70 <br /> 07125-26194 50 16 -3840 NOT SAMPLED-(CONSTRUCTION) <br /> 10/26-27194 51 26 -3950 13,000 10,000 790 <20 270 -- <br /> 01/25-26/95 48 62 -36 86 5,000 3,700 27 <05 44 -- <br /> 04/26-27/95 43 97 -3221 2,900 650 12 2 3 16 -- <br /> 07/27/95 45 03 -33 27 150 21 24 <1 0 1 9 -- <br /> 10/25-26/95 4992 -38 16 <br /> 01/25/96 43 11 -31 35 86 69 0 85 <05 0 84 __3 <br /> 04/25/96 38 31 -2655 <br /> 07/24/96 38 68 -2692 <50 <05 <05 <05 <05 691696 <br /> 10/23/96 4053 -2877 SAMPLED SEMI-ANNUALLY <br /> 01/20/97 3682 -2506 <50 <0 5 <05 <05 <0 5 25 <br /> 07/16/97 34 32 -2256 <50 <0 5 <05 <05 <05 34 <br /> 10/15/97 36 18 -2442 <50 <05 <05 <05 <05 <5 0 <br /> 6981 xls/#180138 5 As of 01/26199 <br />