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i ai s <br /> Groundwater Monitoring a and Analytical Results • <br /> Tosco (Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> z <br /> Stockton, California <br /> Well ID/ Date DTW GIVE TPII(G) 11 T E x MTBE <br /> IDC* (ft ) (ft } (ppb) (Ppb) (ppb) (Ppb) WN tPPb) <br /> MW-1 02/21/90 -- -- 660 1 7 1 9 <05 056 <br /> 10/18/90 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 /> 1041 04/26/93 49 12 -3871 1,400 16 <50 <50 <5 0 -- <br /> 07/26/93 50 13 -3972 550 12 95 <1 0 75 - <br /> 10/20/93 5065 4024 440 05 099 <05 2 1 <br /> 01/17-18194 48 18 -3777 990 15 10 39 150 <br /> 04125-26/94 46 10 -3569 180 2 1 1 7 <0 5 1 5 <br /> 07/25-26/94 4845 -3804 <50 <0 5 <0 5 <05 <05 <br /> 10/26-27/94 4966 -39 25 68' 40 <05 <05 <05 ' <br /> 01/25-26/95 4729 -36 87 <50 <0 5 <05 <05 <0 5 <br /> 04/26-27/95 4232 -31 91 <50 <05 064 <05 075 <br /> 07/26/95 43 35 -3294 <50 <05 064 <05 084 -- <br /> 10/25-26/95 4423 -33 82 <br /> 01/24/96 4141 -31 00 <250 <2 5 <2 5 <25 <2 53 <br /> 04/25/96 3675 -2634 <br /> -- <br /> 07/24/96 37 15 -2674 <50 <05 <05 <05 <0 5 <5 0 <br /> 10/23/96 38 88 -2847 SAMPLED SEMI-ANNUALLY <br /> 01/20/97 35 52 -25 11 <50 <0 5 <05 <05 <05 <50 <br /> 07/16/97 32 72 -2231 <50 <05 <05 <0 5 <0 5 <5 0 <br /> 10/15/97° INACCESSIBLE <br /> 12/08/974 INACCESSIBLE -- <br /> 03/05/98 3046 -2005 <50 <0 50 <0 50 <0 50 <0 50 <2 5/2 06 <br /> 05/27/98 2671 -1630 <50 3 5 <0 50 <0 50 <0 50 32/306 <br /> 6981 xis/p180138 1 i <br /> As of 41/26/99 <br />