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i Tal <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco (Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Well ID/ Date DTW GWE TPH(G) S T E X MTBE <br /> TOC* Ot) 01) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-4 12/08/97 35 74 -24 11 -- -- -- -- -- -- <br /> (cont) 03/05/98 31 71 -2008 3,5009 <50 6 l 59 220 381346 <br /> 05/27/98 2829 -16 66 <50 3 3 <0 50 <0 50 <0 50 271326 <br /> 07/21/98 28 31 -16 68 <50 <0 50 1 8 <0 50 23 181186 <br /> 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 95/106 <br /> 04119-20199 2606 -1443 <50 <0 50 <0 50 <0 50 <0 50 62/4 86 <br /> 07/15-16/99 2736 -1573 <50— <0 50 <0 50 <0 50' <0 so- 32/466 <br /> A1W-5 02/21/90 -- -- 3 600 77 16 05 17 -- <br /> 10/18190 DRY - -- -- -- -- -- <br /> 11/19/90 DRY - - -- -- - <br /> 12/27/90 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 /> 10/21-22192 DRY - -- -- - <br /> 01/13/93 DRY -- -- -- -- -- <br /> 11 76 04/26/93 50 82 -3906 60,000 28,000 <250 <250 <250 <br /> 07/26/93 51 81 -4005 43 000 19 000 240 <125 <125 -- <br /> 10/20/93 52 35 -4059 21,000 15,000 120 <50 68 -- <br /> 01/17-18194 49 83 -3807 23,000 13,000 100 <50 75 -- <br /> 04/25-26194 47 75 -35 99 16 000 12,000 92 31 70 - <br /> 07/25-26194 50 16 -3840 NOT SAMPLED- (CONSTRUCTION) -- -- -- <br /> 10/26-27194 51 26 -39 50 13,000 10 000 790 <20 270 -- <br /> 01l25-26195 48 62 -36 86 5,000 3,700 27 <05 44 -- <br /> 04/26-27/95 43 97 -3221 2,900 650 12 23 16 - <br /> 07/27/95 4503 -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 <05 084 --3 <br /> 04/25/96 38 31 -2655 -- -- -- -- -- -- <br /> 6981 xls/#180138 5 As of 07/16/99 <br />