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' TABLE 2 GROUNDWATER ANALYTICAL DATA Knowles-Rock ' Stockton, California Page 7 of 16 (in parts per billion) �V we[IOde TPlig. Benzene _ Ioler� Ell Ib`enzene ' len es MTBE-, Y 3� MW-8 5/6/1998 12,000 520 530 180 800 Cont'd 8/12/1998 9,500 960 880 220 980 -- 11/11/1998 7,400 422 380 130 530 -- 2/11/1999 1 11999 6,800 440 400 140 590 -- 5/4/1999 51800 460 370 I80 490 -- ' 8/4/1999 4,200 1 120 140 46 210 11/18/1999 850 28 27 8.2 34 <5.0 2/3/2000 5,500 260 280 82 390 <5.0 5/9/2000 4,400 270 150 120 470 <5.0 ' 8/16/2000 5,700 240 300 84 390 <25 11/21/20001 2,800 100 100 37 150 <10 3/7/2001 2,800 140 88 61 240 <4.0 ' 5/24/2001 2,300 130 93 53 220 <2.0 8/30/2001 1,100 40 37 20 93 <2.0 12/7/2001 1,200 47 58 19 75 <2.0 2/21/2002 890 47 39 1 16 56 <20 5/22/2002 2,200 80 86 39 140 <2.0 8/27/2002 920 33 46 16 60 <2.0 11/13/2002 1,300 33 37 10 43 <2.0 2/20/2003 880 19 29 9.8 39 Q..0 t 5/29/2003 2,100 72 1 55 36 110 <2.0 8/27/2003 240 3.2 4.3 1.4 6.0 <2.0 11/20/2003 170 <0.5 1.9 0.8 3.1 <2.0 2/26/2004 290 8.1 4.2 2.5 7.9 <2,0 I ' 5/20/2004 130 7.4 4.7 2.3 8.3 <2.0 8/25/2004 630 33 29 16 57 5.5 11/17/2004 210 <0.5 1 1.7 1 1.1 3.3 «.0 2/23/2005 420 19 11 10 34 <0.5 5/25/2005 230 15 6.0 5.3 12 0.6 8/18/2005 1300 67 72 32 130 <0.5 MW-9 5/16/1995 <50 2.6 <0.5 <0.5 6.3 ' I1/9/1995 420 48 2.0 22 58 -- 2/8/1995 56 5.0 <0.5 1.9 3.9 4/24/1996 240 27 1.2 10 17 -- 8/7/1996 19200 46 2.3 21 60 -- ' 11/5/1996 360 21 1 0.8 4.5 10 _- 2/5/1997 170 12 <0.5 5.0 12 5/7/1997 150 25 <0.5 12 22 ' 7/23/1997 210 23 <0.5 9.8 21 <5.0 11/19/1997 180 14 3.8 6.4 22 9.3 2/26/1998 360 23 1.5 15 21 22 5/6/1998 360 18 <0.5 12 19 - ' 8/12/1998 110 11 1 <0.5 4.5 4.9 -- 11/11/1998 89 7.6 <0.5 2.6 1.5 2/11/1999 <50 0.6 <0.5 <0,5 <0.5 -- 5/4/1999 <50 <0.5 <0.5 <0.5 1 <0.5 -- ' 1 8/4/1999 <50 <0.5 <0.5 <0.5 <0.5 11/17/1999 120 <0.5 <0.5 <0.5 <0.5 118 2/3/2000 78 1 0.8 1 0.7 <0,5 <0.5 22 i 1