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• TaAb • <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco (Unocal) Service Station#6981 s <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> WtU IDI Date DTW GWE TPH(G) B T E X MTBE <br /> TOC' (ft 1 (fr) (ppb) (Ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW4 02/21/90 -- -- 2,600 27 10 12 15 - <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 /> 1163 <br /> -1163 04/26/93 5052 -38 89 11,000 1,400 <50 <50 <50 - <br /> 07/26/93 5154 -3991 5,700 800 16 22 <12 5 - <br /> 10/20/93 5203 -4040 3,600' 490 <20 <20 <20 -- <br /> 01/17-18194 4953 -3790 3,800 160 47 23 110 -- <br /> 04/25-26194 4743 -35 80 2,200 200 50 <10 72 -- <br /> 07/25-26194 4988 -38 25 850 74 24 <0 5 6 1 -- <br /> 10/26-27/94 5104 -3941 650 20 22 <1 0 4 6 -- <br /> 01/25-26195 4829 -3666 240 24 <05 <05 094 -- <br /> 04/26-27/95 43 83 -3220 250 24 071 <05 1 5 - <br /> 07/27/95 44 82 -33 19 130 1 5 1 7 <0 5 2 1 - <br /> 10/25-26195 4567 -3404 -- -- -- -- -- -- <br /> 01/25/96 4282 -31 19 <50 1 4 <0 5 <05 <05 --3 <br /> 04/25/96 3824 -2661 -- -- -- -- -- -- <br /> 07/24/96 38 55 -26 92 <50 <0 5 <0 5 <05 <05 60 <br /> 10/23/96 4030 -2867 SAMPLED SEMI-ANNUALLY -- -- -- -- <br /> 01/20/97 3679 -25 16 <50 <05 <05 <05 <0 5 12 <br /> 07/16/97 34 18 -22 55 <50 <05 <05 <05 <0 5 <5 0/256 <br /> 10/15/97 35 97 -2434 <50 <05 <05 <05 <0 5 <5 0/3 06 <br /> 12/08/97 35 74 -24 1 t -- -- -- -- -- -- <br /> 03/05/98 31 71 -2008 3,5004 <50 6 1 5 9 220 38/346 <br /> 05/27/98 2829 -1666 <50 3 3 <0 50 <0 50 <0 50 271326 <br /> 07/21/98 28 31 -1668 <50 <0 50 1 8 <0 50 23 181186 <br /> 6981 xls/1180138 4 As of 04/20/99 <br />