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Ta 1 Groundwater Monitoring T*and Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WILL TDI DATE DTW S.L GWE TPH•G B T E X MTBE >C©c_*(ft PPb) (ppb) (ppb) (pp b) fpp (ppb) i MW-6 10/16/97 3579 49 0-69 0 -2436 <50 <0 5 <05 <0 5 <0 5 <5 0/<2 06 (cont) 12/08/97 3565 -2422 -- -- -- -- -- -- 03/05/98 3162 -2019 <50 <0 50 <0 50 <0 50 <0 50 4 4/<2 0 05/27/98 2819 -1676 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 6� 07/21/98 28 17 -1674 <50 <0 50 070 <0 50 070 <5 0/<2 06 10/14/98 29 13 -1770 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 01125-26/99 2822 -1679 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 04119-20/99 2592 -1449 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 07/15-16/99 2720 -1577 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 1143 10/25-26/99 2883 -1740 <50 <0 50 <0 50 <0 50 074 <2 51276 01/27-28/00 2835 -1692 <50 <0 50 065 <0 50 16 <2 5/<2 06 06126-27/00 2564 -1421 <50 0 <0 500 0 671 <0 500 0 787 <5 001<2 006 1143 09122-23100 2810 -1667 <50 <0 50 093 <0 50 1 1 <2 5/<2 06 12126-27/00 2801 -1658 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00/<2 006 03107-08101 2775 -1632 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00/<2 006 06/26-27101 2870 -1727 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 06 09/12-13/01 3059 -1916 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 06 12/12-13101 3086 -1943 <50 <0 50 12 <0 50 1 7 <5 0/<1 06 03120-21/02 2967 -1824 <50 <0.50 <0 50 <0 50 <0 50 <5 01<2 C' -- 49 -6 -- - -- MW-7 04/16/92 -- -- " 07/30/92 -- 950 320 19 57 25 -- 10/21-22192 -- -- 240 35 26 19 32 -- 01/13/93 -- -- 2,400 1,000 95 35 120 1182 04/26/93 5108 -3926 500 170 <2 5 <2 5 10 -- 07/26/93 5211 -4029 3,800 1,200 59 92 140 -- 10/20/93 5263 -4081 3,500 690 34 44 53 -- 01/17-18/94 5010 -3828 15,000 4,800 460 290 620 -- 04/25-26/94 4798 -3616 8,300 3,700 <25 400 130 -- 07/25-26194 5046 -3864 9,300 3,300 54 420 120 -- 10/26-27194 5163 -3981 3,700 1,900 11 240 <10 -- 6981 xis/#180138 y As of 03/21/02