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Table 1 Groundwater Monitoring Data and Analytical Results Tosco (Unocal) Service Station#6981 4707 Pacific Avenue i Stockton, California ! Well IDI Date DTW GWE WHO B T E X WIVE TOC* (PPb) (PPb) b) b) MW-3 07/27/95 4470 -33 19 <50 <05 <05 <0 5 ;<0 5 -- (cont) 10/25-26195 4559 -3408 -- -- "" 11 -' 01/24/96 4264 -31 13 <50 <05 <05 <0 5 !<0 5 -- 04/25/96 3792 -2641 SAMPLED SEMI-ANNUALLY -- -- "- 07/24/96 DESTROYED -- "- -- I -- -- i i MW4 02/21/90 -- -- 2,600 27 10 12 15 -- 10/18/90 DRY -- -- -- ! -- -- 11119/90 DRY -- 12/27/90 DRY -- -- -- -- 01/28/91 DRY -- 04/02/91 DRY -- -- -- -- -- -- 07/18/91 DRY -- -- -- -- -- -- 09/30/91 DRY -- 11/14/91 DRY - 04/16/92 DRY -- -- -- LL I 07/30/92 DRY 10121-22192 DRY -- 01/13/93 DRY 1163 04/26/93 5052 -3889 11,000 1,400 <50 <50 <50 -- 07/26/93 5154 -3991 5,700 800 16 22 <12,5 -- 10/20/93 5203 -4040 3,6001 490 <20 <20 <20 -- 01/17-18194 49 53 -3790 3,800 160 47 23 110 -- 04125-26/94 4743 -35 80 2,200 200 50 <10 i 72 1 -- 07/25-26/94 4988 -3825 850 74 24 <05 1 6 1 -- 10/26-27194 5104 -3941 650 20 22 <10 4 61 -- 01/25-26195 4829 -3666 240 24 <0 5 <05 094 -- 04/26-27/95 43 83 -3220 250 24 071 <05 1 5 -- 07/27/95 4482 -33 19 130 1 5 17 <05 2 1 -- 10125-26195 45 67 -3404 -- -- -- -- -- -' 01/25/96 4282 -31 19 <50 14 <0 5 <05 <05 __3 04/25/96 3824 -2661 -- -- -- -- -- 1, -- 07/24/96 38 55 -2692 <50 <05 <05 <0 5 1<05 60 10/23/96 4030 -2867 SAMPLED SEMI-ANNUALLY -- -- -- -- 01/20/97 3679 -25 16 <50 <05 <0 5 <01 <0 5 12 ! P 6981 x1s/ 138 ! As 0128100 "