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i Table 1 Groundwater Monitoring Data and Analytical Results Tosco (Unocal) Service Station#6981 4707 Pacific Avenue , Stockton, California 1 Welt IDi nate DTW GWE TPH(G) B T E x MTBE TOC* 00 (1t) (ppb) WN (pAb) Pb) (PPb) (ppb) i MW-5 07/27/95 4503 -3327 150 21 24 <1 0 1 9' -- (cont) 10125-26195 4992 -38 16 -- -- -- "" -- -- 01/25/96 43 11 -31 35 86 69 085 <05 '0 841 —3 04/25/96 3831 -2655 -- -- -- -- 1 "" 07/24/96 38 68 -2692 <50 <0 5 <05 <05 `<0 5 691696 10/23/96 4053 -2877 SAMPLED SEMI-ANNUALLY -- I -- -- 01/20/97 3682 -2506 <50 <05 <0 5 <05 i<0 5 25 07/16/97 3432 -22 56 <50 <05 <05 <05 1<0 5 34 10/15/97 36 18 -2442 <50 <05 <05 <05 1<0 5 <5 0 12/08/97 3605 -2429 -- -- -- -' 1 -- -- 03/05/98 3166 -1990 <50 <0 50 <0 50 <0 50 ;<0 50 231186 05/27/98 2828 -1652 <50 <0 50 <0 50 <0 50 <0 50 8 117 86 07/21/98 2840 -1664 <50 <0 50 20 <0 50 i 2 1 5 014 56 10/14/98 2942 -1766 <50 <0 50 <0 50 <0 50 1<0 50 60/2035/42 012 96 01125-26199 2856 -1680 <50 <0 50 <0 50 <0 50 <0 50 3 514 26 04119-20199 26 11 -1435 <50 <0 50 <0 50 <0 50 <0 50 28/22 6 07115-16199 2751 -1575 <50 <0 50 <0 50 <0 50 <0 50 <2 513 66 11 76 10125-26199 29 17 -1741 <50 <0 50 <0 50 <0 50 <0 50 <2 51136 01127-28100 28 70 -1694 <50 072 078 <0.50 1 10 <2 5/<2 06 MW-6 04/16/92 -- -- NOT SAMPLED -- - -- -- -- 07/30/92 -- -- 4105 <05 <0 5 <05 '<0 5 -- 10/21-22192 -- -- 180 22 08 <0 5 <05 -- 01/13/93 -- -- 140 3 6 <05 06 101, 1143 04/26/93 5028 -38 85, 730 11 <2 5 8 8 i 6 411 -- 07/26/93 5133 -3990 150 <05 <05 07 '<0 5 -- 10/20/93 5179 4036 220 10 095 1 1 1 1 -- 01117-18/94 4929 -37 86 570 36 094 91 24 -- 04/25-26194 4721 -35 78 500 44 16 20 1 211 -- 07l25-26194 4966 -3823, 881 1 8 <05 <05 <0 5 -- 10/26-27194 5082 -3939 <50 <0 5 069 <05 0 59 -- 01/25-26195 4807 -3664 <50 <05 <05 <05 <05 -- 04/26-27195 4366 -3223 <50 <05 <0 5 <05 <05 -- 07/26/95 4463 -3320 <50 055 1 9 <0 5 1 2 3 -- _ 10125-26/95 4546 -3403 <50 <05 <05 <05 <0 5 -- 6981 x1s1038 As 28100