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Groundwater Monitoring Data and Analytical Results Former Unocal Service Station #5098 5606 Pacific Avenue Stockton, California Well ID/ Date DTW GWE TPII(G) B T E X MTBE 1,2-DCE TUC* (ft) (msI) (ppb) (ppb) (ppb) {ppb) (ppb) (ppb) (ppb) MW-12 09/29/93 58 78 -47 80 20,000 1,200 840 660 1,400 -- ND (cont) 12/20/93 52 52 -41 54 31,000 1,600 720 320 1,900 -- ND 03/29/94 4948 -38 50 36,000 3,400 3,500 650 3,200 - ND 06/28/94 54 73 -43 75 25,000 760 820 340 2,200 - ND 09/14/94 57 38 -4640 23,000 1,200 720 540 1,800 - ND 12/06/94 52 W -41 12 20 000 540 390 150 1,200 - - 02/08/95 49 18 -3820 22,000 550 700 280 1,400 -- - 06/21/95 4997 -38 99 9,600 800 230 300 740 - - 09/19/95 52 15 -41 17 10,000 620 160 270 640 --4 -- 12/19/95 4657 -35 59 8,600 830 23 420 280 - -- 03/11196 4311 -3213 -- -- -- -- -- 06/19/96 4499 -3401 2,500 250 5 9 88 38 89 -- 09/17/96 4716 -3618 2,700 200 43 130 150 83 -- 12/05/96 4245 -31 47 5,400 540 39 360 200 100 - 09/16/97 44 15 -33 17 2506 1 8 054 059 14 37 - 09/15/98 38 42 -27 44 120 069 1 50 ND 1 4 ND/ND7 -- 12/22/98 3249 -21 51 4,900 320 ND8 340 38 1701ND7 - 03/I8/99 3049 -1951 3,200 290 11 310 17 -- — MW-13 06/03/92 -- -- ND ND ND ND ND - 12 09/30/92 -- ND ND ND ND 092 ND 12/30/92 -- -- ND ND ND ND ND - ND 1149 03/25/93 53 78 -42 29 ND ND ND ND ND - ND 11 21 06/28/93 5666 -45 45 ND ND ND ND ND - ND 09/29/93 58 30 -4709 ND ND ND ND ND -- ND 12/20/93 5245 -4124 ND ND 052 ND ND - ND 03/29/94 4980 -38 59 ND 0 81 1 2 0 83 074 -- ND3 06/28194 5403 -42 82 ND ND ND ND ND -- ND 09/14/94 56 69 -45 48 ND 22 54 060 4 3 - ND 12106/94 52 38 -41 17 ND ND 0 88 ND 1 4 -- -- 02/08/95 49 62 -38 41 ND ND ND ND ND -- - 06/21/95 4965 -38 44 ND ND 099 ND 0 79 - - 09/19/95 51 72 -4051 ND ND ND ND ND - -- 12/19/95 4707 -35 86 ND ND ND ND ND - -- 5098 xls/#280046 3 As of 03/18199