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' TABLE 2 GROUNDWATER ANALYTICAL DATA ' Knowles-Rock Stockton, California Page 2 of 15 ' (in parts per billion) well ; Date TPHg Benzene Toluene Fthylhenzene Xylenes MTBE f 1 f ' 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 11/10119981 4,400 280 210 130 —530--- 2/12/1999 302/12/1999 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 69 <0 5 <0 5 38 <5 0 I 2/4/2000 210 38 13 5 1 54 <5 0 5/9/2000 6,600 760 170 510 700 <25 8/15/2000 <50 <0 5 <0 5 <0 5 <0 5 <0 5 11/22/2000 290 32 <0 5 98 7 1 <5 0 3/7/2001 5,200 440 140 180 600 <4 0 5/24/2001 3,100 510 170 120 320 <2 0 8/30/2001 81 6 2 1 1 13 56 <2 0 12/6/2001 Not Sampled 2/21/2002 540 89 54 1 27 49 <2 0 5/22/2002 Not Sampled lie 8/27/2002 290 20 11 1 12 41 <2 0 11/3/2002 Not Sampled 2/20/2003 4,200 1 230 35 1 150 330 66 5/29/2003 Not Sampled 8/28/2003 2,000 75 49 46 180 <2 0 11/19/2003 Not Sampled 2/26/2004 4,600__J_ 660 64 1 160 310 <2 0 5/2012004 Not Sampled 8/25/2004 15,000 1 1,700 750 1 1,100 3,700 <20 11/17/20041 Not Sampled 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 =Y 8/7/1996 140 <0 5 <0 5 <0 5 <0 5 11/5/1996 190 1 7 <0 5 1 <0 5 <0 5 -- I 2/5/1997 180 30 <0 5 <0 5 <0 5 == 5/7/1997 270 100 <0 5 <0 5 <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 I 2/27/1998 770 86 <0 5 63 20 1 <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 <10 11 47 220 2/12/1999 6,000 4,600 54 160 740 1,600 5/4/1999 4 600 3,700 10 68 96 1,400 I