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<br /> Groundwater Monitoring ata and Analytical Results
<br /> Former Unocal Service Station#2859 _
<br /> 1665 Pacific Avenue
<br /> Stockton California
<br /> Well ID/ Date DTW GWE TPH(G) B 1 E X MTBE
<br /> TOC* (ft) (msl) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb)
<br /> MW-1 12/04/98 24 33 -1467 ND ND ND ND ND ND/ND4
<br /> (cont) 02/04/99 23 63 -13 97 ND ND ND ND 24 -42 34
<br /> (D) 02/04/99 -- -- ND ND 082 ND l 6 --
<br /> 907 03/12/99 2281 -1374 ND ND ND ND ND ND
<br /> MW-2 06/06/88 -- -- 99,000 5,700 48,800 5,000 25,000 --
<br /> 10/26/88 - - 172 000 9 400 82 600 4,600 26 000 --
<br /> 03/02/89 - -- 163,000 2,460 25,080 3,270 16,990 --
<br /> 08/28/89 - - 220,000 6,800 44 000 4 000 21,000 -
<br /> 11/30/89 -- 200,000 16,000 35,000 2,700 14,000 --
<br /> 03/01/90 -- 240,000 11,000 40,000 2,800 17,000 --
<br /> 05/30/90 - -- 260,000 27 000 66,000 5,100 27,000 --
<br /> 08/24/90 DRY - -- -- -- -- --
<br /> 11/19/90 DRY - - - - - -- --
<br /> 02/25/91 DRY -- - - - --
<br /> 05/29/91 DRY - - - - - --
<br /> 08/28/91 DRY - - - - -- --
<br /> 11/06/91 DRY -- - - - -- -
<br /> 03/04/92 DRY - - - - -- --
<br /> 05/21/92 DRY -- - -- -- --
<br /> 08/18/92 DRY - - - -- -- --
<br /> 11/13/92 DRY -- -- -- -- -- --
<br /> 10 19 03/26/93 48 35 -38 16 480,000 14,000 75,000 6,500 37,000 --
<br /> 06/04/93 46 55 -36 36 170 000 15 000 65 000 5 000 24,000 --
<br /> 11/12/93 46 78 -3659 130,000 14,000 27,000 7,000 28,000 --
<br /> 02/18/94 44 82 -34 63 200,000 25,000 67,000 5,000 28,000 -
<br /> 05/23/94 43 61 -33 42 130,000 27,000 68 000 5,400 29,000 --
<br /> 08/12/94 45 38 -35 19 180,000 15,000 62,000 5,300 29,000 --
<br /> 01/08/94 45 57 -35 38 120,000 12,000 61,000 6,000 28,000 --
<br /> 02/07/95 4328 -3309 120,000 13,000 60,000 5,500 29,000 --
<br /> 05/04/95 3978 -2959 170,000 20,000 54 000 4,400 23,000 --
<br /> 08/10/95 -- -- -- -- -- -- --
<br /> 1008
<br /> -1008 08/26/95 39 89 -2981 140,000 4,400 63 000 5,400 28 000 --
<br /> 11/09/95 39 55 -2947 140,000 6,400 45,000 5,600 29,000 --
<br /> 02/08/96 37 03 -2695 280,000 3,500 100,000 9,200 52,000 --
<br /> 05/08/96 33 59 -23 51 180,000 1,900 46,000 4,200 25,000 ND
<br /> 2859 xts/280054 2 As of 03/12/99
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