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' TABLE 2 GROUNDWATER ANALYTICAL DATA Knowles-Rock Stockton,California ' Page 2 of 16 (in parts per billion) ' Well Date TI•Hg Benxere- Toluene EEhylb:enzene Xylenes MTBE MW-2 7/23/1997 76,000 10,000 1,200 2,800 14,000 <100 Cont'd 11/21/1997 92,000 7,900 4,500 2,900 15,000 <20 ' 2/27/1998 2,600 68 18 30 150 <5.0 5/6/1998 2,400 97 34 16 140 8/12/1998 2,000 100 87 43 210 - 11/10/19981 4,400 280 210 130 530 ^n 2/12/1999 790 110 14 16 74 5/4/1999 850 54 46 46 100 - 8/3/1999 710 59 40 38 93 -- ' 11/17/1999 110 6.9 <0.5 <0.5 3.8 <5.0 2/4/2000 210 38 1.3 1 5.1 5.4 <SA 5/9/2000 69600 760 170 510 700 <25 ' 8/15/2000 <50 <0.5 <0.5 <0.5 <0.5 <0.5 11/22/2000 290 32 <0.5 9.8 7.1 <5.0 3/7/2001 5,200 440 140 1S0 600 <4.0 5/24/2001 3,100 510 170 120 320 <2.0 ' 8/30/2001 81 6.2 1.1 1.3 5.6 <2.0 12/6/2001 Not Sampled 2/21/2002 540 89 5.4 1 27 49 <2.0 5/22/2002 Not Sampled ' 8/27/2002 290 20 Il 1 12 41 <2.0 11/3/2002 Not Sampled 2/20/2003 4,200 230 35 150 330 66 5/29/2003 Not Sampled • 8/28/2003 2,000 75 49 1 46 180 <2.0 11/19/2003 Not Sampled 2/26/2004 4,600 660 6.4 160________I__ __310 1 <2.0 ' 5/20/2004 Not Sampled 8/25/2004 15,000 1,700 750 1 11100 3,700 20 11/17/2004 Not Sampled 2/23/2005 17,000 3,200 20 1 1,300 1,400 26 t 5/25/2005 Not Sampled 8/17/2005 MW-3 5/16/95- Not Sampled 11/9/1995 2/8/1995 350 <0.5 <0.5 <0.5 <0.5 =_ 4/24/1996 110 <0.5 <0.5 <0.5 <0.5 8/7/1996 140 <0.5 <0.5 <0.5 <0.5 - 11/5/1996 190 1.7 <0.5 <0.5 <0.5 2/5/1997 180 30 <0.5 <0.5 <0.5 5/7/1997 270 100 <0.5 <0.8 <0.5 7/23/1997 620 120 <0.5 <0.5 <0.5 <5.0 ' 11/20/1997 550 59 <0.5 <0.5 <0.5 <5.0 2/27/1998 770 S6 <0.5 6.3 20 <5.0 5/6/1998 640 50 <0.5 10 52 19 8/12/1998 690 220 <0.5 44 49 27 ' 11/10/1998 1,600 360 <1.0 11 47 220 2/12/1999 6,000 4,600 54 160 740 1,600 5/4/1999 4,600 3 700 1 10 68 1 96 1,440