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i f i Table 1 Groundwater Monitoring Data and Analytical Results Former Unocal Service Station#5098 5606 Pacific Avenue Stockton, California Well IDI Date DTW GWE TPH(G) B T E X , MTBE 1,2-DCE TOC* Ot) (urs!) ppb) (ppb) (ppb) (p b) (ppb) (ppb) (ppb) N[W-12 06103192 23,000 2 300 2,000 840 1,700 92 09130!92 - 16,000 1,700 1,000 590 880 -- 24 12/30/92 -- -- 1 23 1 000 3200 1,200 560 1,800 - 32 11 19 03/25/93 53 28 -4209 211000 2,800 1,900 700 1,400 -- ND 1098 06/28/93 57 32 -46 34 1 22,000 1,300 920 500 1,800 -- 87 09/29/93 58 78 -4780 20,000 1,200 840 660 1,400 -- ND 12/20/93 52 52 -41 54 31 f 000 1,600 720 320 1,900 -- ND It 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 23E000 1,200 720 540 1,800 -- ND 12/06/94 52 10 -41 12 20;000 540 390 150 1,200 -- -- 02/08l95 49 18 -38 2r0 22000 550 700 280 1,400 -- -- 06121l95 49 97 -38 99 9`600 800 230 300 740 -- -- 09/19/95 52 15 -41 17 10000 620 160 270 640 -4 -- 12/19/95 46 57 -35 59 8`600 830 23 420 280 -- -- 03/11/96 4311 -3213 �500 -- -- -- --06!19196 4499 -34 Ol 2 250 5 9 88 38 89 -- 09117l96 4716 -3618 21'700 200 43 130 150 83 -- 12/05/96 4245 -31 47 51400 540 39 360 200 100 -- 09/16/97 44 15 -33 17 2506 1 8 054 059 1 4 37j 11 -- 09/15/98 3842 -27 44 1E20 069 1 50 ND 1 4 ND/ND7 -- 12/22/98 32 49 -21 51 4900 320 NDB 340 38 1701ND7 -- 03/18/99 3049 -195 1 1 31,200 290 11 310 17 -- 06/17/99 33 90 -22 92 550 23 NDB 6 1 NDB -- -- 09/16/99 3641 -25 43 6,810�Z 210 NDB 278 148 -- , NIW-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 11 49 03/25/93 53 78 -4229 ND ND ND ND ND - ND 11 21 06/28/93 56 66 -45 45 ND ND ND ND ND - ND f 09/29/93 58 30 -47 09 ND ND ND ND ND -- ND 12/20/93 5245 -41 24 ND ND 051, ND ND -- ND 03/29/94 4980 -38 59 ND 0 8l 12 083 074 ND' II 06/28/94 54 03 -42 82 ND ND ND ND ND ND 5098 xis/#280046 I� 3 As 09116199