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<br /> Groundwater Monitoring Data and Analytical Results
<br /> Former Unocal Service Station#5098
<br /> 5606 Pacific Avenue
<br /> Stockton, California
<br /> Well IDI Date DTW GWE TPII(G) 13 T E X MTBE 1,2-DCE
<br /> TOC* (f1) (MSI) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb)
<br /> MW-10 12/05/96 4306 -31 30 SAMI LLD ANNUALLY -- -- -- -- --
<br /> (cont) 09/16/97 4420 -3244 ND ND ND ND ND ND 068
<br /> 09/15/98 3840 -2664 ND ND ND ND ND NDIND7 ND
<br /> 12/22/98 3312 -2136 ND ND ND ND ND ND/ND7 ND
<br /> 03/18/99 31 22 -1946 ND ND ND ND ND -- ND
<br /> 1177 06/17/99 3400 -22 23 ND ND ND ND ND -- ND'
<br /> 09/16/99 3635 -2458 ND ND 101 ND 115 -- NW
<br /> NIW-11 06103192' -- -- 620 150 70 26 68 - 680
<br /> 09/30/92 42,000 8 800 6,200 1,600 4,400 - 56
<br /> 12/30/92 -- -- 84,000 20 000 27,000 2,400 14,000 - 330
<br /> 11 58 03/25/93 53 59 -4201 78,000 18,000 23,000 2,100 12,000 - 190
<br /> 1122 06/28/93 57 73 -4651 83,000 18 000 24,000 2,100 13,000 300
<br /> 09/29/93 59 11 -4789 51,000 8,300 7,200 1,300 4,000 77
<br /> 12/20/93 53 64 -4242 100,000 17,000 23,000 1,800 16,000 -- 280
<br /> 03/29/94 49 65 -3843 87 000 14,000 17,000 1,700 9,700 -- 220
<br /> 06/28/94 55 12 -4390 86,000 15,000 20,000 1,700 11,000 - 310
<br /> 09/14/94 57 77 -4655 88,000 12 000 18,000 2,200 11,000 -- 180
<br /> 12/06/94 52 26 -4104 75,000 11,000 17,000 1,500 11,000 - --
<br /> 02/08/95 49 32 -38 10 96,000 11,000 19,000 1 800 10 000 --
<br /> 06/21/95 50 31 -3909 71,000 15,000 19,000 1 500 12,000 --
<br /> 09/19/95 5249 -41 27 53,000 8,700 9,500 940 6,800 -4 --
<br /> 12/19/95 46 72 -35 50 32 000 6,500 2,400 920 4,100 J -
<br /> 03/11/96 43 22 -3200 -- -- -- -- -- --
<br /> 06/19/96 45 41 -34 19 36,000 5,900 1,000 800 4,500 150 --
<br /> 09/17/96 47 52 -36 30 36,000 8,300 4,500 1,100 5,600 390 --
<br /> 12/05/96 42 58 -31 36 30 000 6,500 780 740 4,300 ND -
<br /> 09/16/97 44 49 -33 27 50,000 15 000 l 100 720 7,700 2,400 -
<br /> 09/15/98 38 79 -27 57 24,000 6,900 430 360 2,500 'ND/ND7 -
<br /> 12/22/98 32 65 -21 43 20,000 5,600 230 330 1,500 8ND/ND7 --
<br /> 03/18/59 30 66 -1944 13,000 6200 210 260 1,700 - -
<br /> 06/17/99 3424 -23 02 23,000 6,000 250 250 1,900 - -
<br /> 09116/99 3675 -2553 19,1001, 4,940 227 254 1,370 - --
<br /> 5098 xis/!1280046 2 As of 09/16/99
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