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Table 2 Groundwater Analytical Data 440 West Charter Way, Stockton, CA Ethyl- Well Date TPHg Benzene Toluene benzene Xylenes MTBE Number Sampled (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-7 02/05/92 24,000 1,100 60 430 780 NA 05/15/92 9,400 1,200 46 230 570 NA 10/15/92 — - -- -- 12/17/92 -- -- 03/18/93 41,000 7,400 630 1,000 1,800 NA 06/10/93 6,200 370 19 160 130 NA 09/20/93 6,600 450 30 45 190 NA 03/16/94 6,400 250 270 53 230 NA 06/15/94 6,100 240 28 19 91 NA 09/22/94 9,500 540 62 52 120 NA 12/01/94 9,500 320 84 190 370 NA 02/17/95 6,200 130 50 21 180 NA 05/17/95 3,900 31 89 12 63 NA 08/15/95 2,200 29 12 3 8 19 97 11/16/95 2,700 25 12 6 4 31 NA 02/27/96 370 6 0 <0 5 059 <0 5 NA 05/15/96 760 1 8 <0 5 2 8 7 1 NA 08/22/96 <50 <0 5 <0 5 <0 5 <0 5 <30 11/25/96 100 06 <0 5 <0 5 <0 5 <30 MW-8 02/05/92 6,400 270 11 ND 15 NA 05/15/92 3,000 300 11 ND 17 NA 10/15/92 -- - -- -- 12/17/92 3,900 660 16 12 29 NA 03/18/93 2,200 350 9 11 19 NA 06/10/93 2,000 380 10 11 25 NA 09/20/93 4,100 580 11 21 35 NA 03/16/94 -- - -- - -- 06/15/94 750 18 78 16 91 NA 09/22/94 5,900 430 8 8 2 8 32 NA 12/01/94 --L -- -- -- - 02/17/95 Inaccessible 05/17/95 1,800 72 30 <0 5 2 5 NA 08/15/95 330 13 4 2 <0 5 <0 5 23 11/16/95 480 8 8 <0 5 <0 5 077 NA 02/27/96 550 19 <0 5 <0 5 0 54 NA 05/15/96 670 34 078 <0 51 2 2 NA 08/22/96 560 32 1 5 <0 5 1 3 <30 11/25/96 270 601 0 55 <0 5 <0 5 <30 Page 4 of 8