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i Table 1 Groundwater Monitoring Data and Analytical Results Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL mf DATE DTW S.I. GWE TPHA B T E X MTBE "AUC* { bgs) ( ) (ppb) (ppb) (ppb) (ppb) (ppb) (Ppb) i MW-5 04/16/92 DRY 50 0-55 0 -- (cont) 07/30/92 DRY -- -- -- -- "" -- 10/21-22192 DRY - -- -- -- -- -- i 01/13/93 DRY -- -- -- -- -- -- -- 1176 04/26/93 5082 -3906 60,000 28,000 <250 <250 <250 -- 07/26/93 5181 -4005 43,000 19,000 240 <125 <125 -- I0/20/93 5235 -4059 21,000 15,000 120 <50 68 -- 01/17-18/94 4983 -3807 23,000 13,000 100 <50 75 -- 04125-26/94 4775 -3599 16,000 12,000 92 31 70 -- 07/25-26194 5016 -3840 NOT SAMPLED-(CONSTRUCTION) -- -- -- 10126-27194 5126 -3950 13,000 10,000 790 <20 27 11 0 -- 01125-26195 48 62 -36 86 5,000 3,700 27 <0 5 44 -- 04/26-27/95 4397 -3221 2,900 650 12 23 16 -- 07/27/95 4503 -3327 150 21 24 <1 0 19 -- 10/25-26195 4992 -3816 -- -- - -- -- -- 01/25/96 4311 -3135 86 69 085 <0 5 084 --3 04/25/96 3831 -2655 -- -- -- - -" 07/24/96 3868 -2692 <50 <0 5 <0 5 <0 5 <0 5 691696 10/23/96 4053 -2877 SAMPLED SEMI-ANNUALLY -- -- -- 01/20/97 3682 -2506 <50 <0 5 <0 5 <0 5 <0 S 25 07/16/97 3432 -2256 <50 <0 5 <0 5 <0 5 <0 5 34 10/15/97 3618 -2442 <50 <0 5 <0 5 <0 5 <0 5 <5 0 12/08/97 3605 -2429 -- -- -- -- -- '- 03/05/98 3166 -1990 <50 <0 50 <0 50 <0 50 <0150 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 50 211 50/45 6 10/14/98 2942 -1766 <50 <0 50 <0 50 <0 50 <0 50 60/2 96 01125-26/99 2856 -1680 <50 <0 50 <0 50 <0 50 <0 50 35/42 6 04119-20199 2611 -1435 <50 <0 50 <0 50 <0 50 <0150 29/226 07/15-16/99 2751 -1575 <50 <0 50 <0 50 <0 50 <0'50 <2 513 66 1176 10125-26/99 2917 -1741 <50 <0 50 <0 50 <0 50 <0150 <2 51136 i 6981 x1s/08 As'o�127/00