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i Table 1 U Groundwater Monitoring Data and Analytical Results Tosco(Unocal) Service Station#6981 4707 Pacific Avenue Stockton, California Well ID/ Date DTW GWE TPH(G) B T E } X MTBE TOC* (fte) (ft) (Ppb) (PPb) (ppb) (Ppb) (Ppb) (Ppb) MW-1 01125-26199 2704 -1663 <50 <0 50 <0 50 <0 50 C0 50 621536 (cont) 04119-20199 2453 -14 12 <50 <0 50 <0 50 <0 50 <0 50 251246 07115-16199 25 81 -1540 <50 <0 50 <0 50 <0 50 <0 50 <2 512 06 1041 10125-26199 2740 -1699 <50 <0 50 <0 50 <0 50 0 76 I,I 51/38 6 j MW-2 02/21/90 -- -- 12,000 1,900 75 21 11401 -- 10/18/90 DRY -- -- -- -- I -- -- 11/19/90 DRY -- -- -- "- -- -- 12/27/90 DRY -- - -- -- -- I -- 01/28/91 DRY -- -- -- -- - -- 04/02/91 DRY -- 07/18/91 DRY -- -- -- -- E - -- 09/30/91 DRY -- -- -- - -- 11/14/91 DRY -- -- -' -- -- I - -- 04/16/92 DRY -- - -- -- -- -- -- 07/30/92 DRY -- -- -- - -- -- -' i 10121-22192 DRY -- -- - -- I -- - 01/13/93 DRY -- - -- -- --1156 04/26/93 5072 -39 16 43,000 8,000 <125 <125 C 125 -- 07/26/93 51 72 -4016 18,000 2,900 47 38 90 -- 10/20/93 5226 -4070 12,000 2,400 52 <20 60 -- 01/17-18194 4974 -38 18 14,000 1,800 31 29 X120 -- 04/25-26194 4761 -3605 21,000 8,000 240 93 1220, -- 07125-26194 5007 -3851 NOT SAMPLED-(CONSTRUCTION) - -- i -- 1 -- 10/26-27194 51 25 -39 69 24,000 11,000 3,100 96 3,200 -- 01125-26195 4849 -36 93 , 8,600 4,100 94 35 11301 =_ 04126-27195 43 88 -3232 11,000 5,300 460 74 1530 07/27/95 4495 -33 39 3,300 640 26 <12 5 13 '1 -- 10/25-26195 45 84 -34 28 - -- - -- -- 01/25/96 4305 -31 49 2,100 5I0 29 <10 3 04/25/96 38 22 -2666 - -- - - 07/24/96 38 60 -2704 1,300 470 110 16 i 75 36 10/23/96 4043 -2887 SAMPLED SEMI-ANNUALLY -- - -- 01/21/97 36 93 -25 37 250 72 13 45 16 18 07117197 3424 -2268 16,000 3,900 220 180 3901 <250 I _ 6981 x1s 138 As 0126/99 I