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i ' TABLE 2 GROUNDWATER ANALYTICAL DATA Knowles-Rock Stockton,California Page 5 of 16 (in parts per billion) I Well Date TPHg . Benzene Tofi etie Rthylbenzene Xylenes MTBE MW-5 5/29/2003 24,000 2,200 140 1,200 1,300 <20 Cont'd 8/27/2003 13,000 1,000 70 300 400 <20 11/20/2003 25,000 4,300 330 1,500 2,300 <20 Z/26/2004 27,000 3,000 200 1,500 1,800 <20 5/20/2004 13,000 1,400 100 25 120 <20 8/25/2004 5,800 1,500 45 360 340 QO i ' 11/17/2004 16,000 3,300 190 1,000 1,500 <10 i 2/23/2005 12,000 2,200 50 760 510 <20 5/25/2005 8/17/2005 Not Sampled - MW-6 5/16/1995 440 47 18 1.8 10 11/9/1995 540 66 8.3 12 21 2/8/1995 520 <0.5 <0.5 <0.5 3.0 -- ' 4/24/1996 950 4.3 4.3 3.8 2.9 -_ 8/7/1996 250 <0.5 <0.5 <0.5 <0.5 11/5/1996 270 7.8 1 <0.5 <0.5 <0.5 -- 2/5/1997 310 4.5 <0.5 <0.5 <0.5 I ' 5/7/1997 240 6.8 <0.5 <0.5 <0.5 - 7/23/1997 140 1.2 <0.5 <0.5 <0.5 <5.0 11/19/1997 120 <0.5 <0.5 <0.5 <0.5 <5.0 ' 2/26/1998 110 <0.5 <0.5 <0.5 <0.5 <5.0 5/6/1998 170 <0.5 <0.5 <0.5 18 8/11/1998 120 <0.5 <0.5 <0.5 <0.5 11/11/1998 <50 <0.5 <0.5 <0.5 <0.5 2/11/1999 <50 <0.5 <0.5 <0.5 <0.5 =_ 5/4/1999 <50 <0.5 <0.5 <0.5 <0.5 8/4/1999 <50 <0.5 <0.5 <0.5 <0.5 - 11/17/1999 <50 <0.5 <0.5 <0.5 <0.5 <5.0 2/3/2000 130 2.2 <0.5 <0.5 <0.5 <5.0 5/9/2000 71 1.5 <0.5 <0.5 <0.5 <5.0 8/15/2000 88 1.6 <0.5 <0.5 <0.5 <5.0 11/21/2000 120 1.4 <0.5 <0.5 <0.5 <5.0 3/7/2001 <50 0.9 <0.5 <0.5 <0.5 <2.0 5/23/2001 <50 1.5 <0.5 <0.5 <0.5 <2.0 8/30/2001 Not Sampled 12/6/2001 <50 1.0 <0.5 <0.5 <1.0 <2.0 2/20/2002 Not Sampled 5/22/2002 <50 0.7 <0.5 <0.5 <1.0 <2.0 ' 8/26/2002 Not Sampled 11/13/2002 <50 <0.5 <0.5 1 <0.5 <1.0 <TO 2/19/2003 Not Sampled 5/29/2003 <50 <0.5 <0.5 1 <0.5 <1.0 <2.0 8/27/2003 Not Sampled 11/20/2003 <50 <0.5 <0.5 1 <0.5 <1.0 <2.0 2/25/2004 Not Sampled 5/20/2004 <50 <0.5 <0.5 1 <0.5 <1.0 <2.0 ' 8/25/2004 Not Sampled 11/17/2004 <50 <0.5 <0.5 <0.5 <1.0 <2.0- 2/23/2005 5/25/2005 Not Sampled 8/17/2005