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1� Table 1 Groundwater Monitoring Data and Analytical Results Service Station#6981 I Tosco (Unocal) I 4707 Pacific Avenue I Stockton, California Well ID/ Date DTW GWE T"PH(G) B T E X MTBE TOC* (`t) Of (ppb) (ppb) (Ppb) (ppb) (ppb) (ppb) MW-5 04/25/96 38 31 -2655 -- -- - - " (cont) 07/24/96 38 68 -2692 <50 <05 <05 <05 r05 69/696 10/23/96 4053 -2877 SAMPLED SEMI-ANNUALLY -- -- I -- -- 01/20/97 36 82 -2506 <50 <05 <05 <05 <0 5 25 07/16/97 3432 -2256 <50 <0 5 <05 <0 5 1<0 5 34 10/15/97 36 18 -24 42 <50 <0 5 <0 5 <05 i<0 5 <5 0 12/08/97 3605 -2429 -- -- -- 03/05198 31 66 -1990 <50 <0 50 <0 50 <0 50 <0 50 23/186 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 1 2 1 5 014 56 10/14/98 2942 -1766 <50 <0 50 <0 50 <0 50 <0 50 60/2 96 01125-26199 2856 -1680 , <50 <0 50 <0 50 <0 50 <0 50 3 5/4 26 04/19-20199 26 11 -1435 <50 <0 50 <0 50 <0 50 <0 50 2 29/22 6 07/15-16199 2751 -15 75 <50 <0 50 <0 50 <0 50 <0 50 <2 513 66 11 76 10125-26199 2917 -1741 <50 <0 50 <0 50 <0 50 <0 50 <2 51136 I „ I i MW-6 04/16/92 -- - NOT SAMPLED -- -- -- 07/30/92 - - 4105 <05 <05 <05 fi<0 5 -- 10/21-22/92 -- -- 180 22 08 <05 1<0 5 -- 01/13193 -- -- 140 3 6 <05 0 6 1 1 0 -- 11 43 04/26/93 5028 -38 85 ' 730 11 <25 8 8 E 6 4 -- 07/26/93 51 33 -3990 150 <0 5 <05 07 <05 -- 10/20/93 51 79 -4036 220 -10 095 1 1 1 11 - 01117-18194 4929 -37 86' 570 3 6 094 9 1 24 I -- 04/25-26/94 4721 -3578 500 44 16 20 ; 1 2', -- 07125-26/94 4966 -3823 881 1 8 <05 <0 5 <0 5 -- 10/26-27194 5082 -39 39 <50 <05 0 69 <05 �0 59i - 01/25-26195 4807 -3664 <50 <05 <05 <05 I<0 5 - 04/26-27/95 43 66 -3223 <50 <05 <05 <0 5 <<0 5 -- 07/26/95 4463 -3320 <50 055 1 9 <0 5 1 2 3' -- 10/25-26195 4546 -3403 <50 <05 <05 <0 5 ,<0 511 -- 01/24/96 4249 -31 06 <50 <05 <0 5 <05 <0 5 -- 04/25/96 3807 -2664 <50 <05 <05 <05 <0 5 <40 07/24/96 3840 -2697 <50 <0 5 <0 5 <05 1<0 5 <5 0 10/23/96 40 11 -2868 <50 <05 <0 5 <05 <0 5 <5 0 6981 XIS1 138 I As 1&26199 I