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T� 1 Groundwater Monitoring�dta and Analytical Results 0 Tosco (Unocal) Service Station#6981 4707 Pacific Avenue Stockton, California Well 1D/ Date DTW GWE TPH(G) B T E X MTBE TOC* (ft ) (ft } (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-5 12/08/97 3605 -2429 -- -- -- -- -- (cont) 03/05/98 31 66 -1990 <50 <0 50 <0 50 <0 50 <0 50 231186 05/27/98 28 28 -1652 <50 <0 50 <0 50 <0 50 <0 50 8 1/78 6 07/21/98 2840 -1664 <50 <0 50 20 <0 50 2 1 5 0/4 56 10/14/98 2942 -1766 <50 <0 50 <0 50 <0 50 <0 50 60/20 01/25-26/99 2856 -1680 <50 <0 50 <0 50 <0 50 <0 50 35/42 6 MW-6 04/16/92 -- -- NOT SAMPLED -- _- __ -- 07/30/92 -- -- 4105 <05 <05 <05 <05 -- 10/21-22192 -- -- 180 22 08 <05 <0 5 -- 01/13/93 -- -- 140 3 6 <0 5 06 to -- 1143 04/26/93 5028 -38 85 730 11 <25 88 64 -- 07/26/93 51 33 -3990 150 <0 5 <05 07 <05 -- 10/20/93 51 79 -4036 220 10 095 1 1 1 1 01/17-18/94 4929 -37 86 570 3 6 094 9 1 24 -- 04/25-26/94 4721 -35 78 500 44 1 6 20 1 2 -- 07/25-26194 4966 -3823 88, 1 8 <05 <05 <05 -- 10/26-27/94 5082 -39 39 <50 <05 069 <05 059 -- 01/25-26195 4807 -3664 <50 <05 <0 5 <05 <0 5 -- 04/26-27195 43 66 -32 23 <50 <0 5 <0 5 <05 <05 -- 07/26/95 4463 -3320 <50 055 1 9 <05 2 3 -- 10/25-26195 4546 -3403 <50 <05 <05 <05 <05 -- 01/24/96 4249 -31 06 <50 <05 <0 5 <0 5 <05 -- 04/25/96 38 07 -2664 <50 <0 5 <05 <0 5 <0 5 <40 07/24/96 3840 -2697 <50 <05 <05 <05 <0 5 <50 10/23/96 40 11 -28 68 <50 <05 <05 <05 <0 5 <5 0 01/20/97 36 68 -2525 <50 <05 <0 5 <05 <05 <5 0 07116197 3403 -2260 <50 <0 5 <0 5 <05 <05 <50 10/16/97 35 79 -24 36 <50 <0 5 <05 <05 <0 5 <5 0/<2 06 12/08/97 35 65 -2422 -- -- -- 03/05/98 31 62 -20 19 <50 <0 50 <0 50 <0 50 <0 50 4 4/<2 0 05/27/98 28 19 -1676 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 07/21/98 28 17 -1674 <50 <0 50 070 <0 50 070 <5 0/<2 06 10/14/98 29 13 -1770 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 01125-26/99 2822 -1679 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 698I xis/#180138 6 As of 01!26199