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Quarterly Monitoring Well Sampling Report Cox Cox WES#4090-P P.O Box 1046 Tracy, CA 95378 Well No. Date Well Depth Depth to Casing elev. Water Elev. Floating TPHG Benzene Toluene Ethylhenzene Xylene Fuel Ox. Sampled (R) Water(8.) (MSLfL)* (MSL R) Product MW9 8/20/1997 15.95 8.33 48.28 39.95 None 14000 1.2 4 14 24 ND MW9 12/12/1997 . 15.95 . 8....-. _ 48.28 . 40.28 None. 260 . 11 15 3.7 12 ND T. MW9 3/31/1998 13.18 7.23 48.28 41.05 None 15000 1700 470 890 1500 ND MW9 6/30/1998 13.18 7.49 48.28 41.79 None 29000 1600 490 1400 2900 ND MW9 9/29/1998 13.18 8.76 48.28 39.52 None 12000 680 80 710 1700 ND MW9 1/14/1999 13.18 8.41 48.28 39.87 None 14000 1300 300 1200 1700 ND MW9 4/29/1999 13.32 7.87 48.28 40.41 None 5800 1000 60 540 550 ND MW9 6/30/1999 13.32 8.22 48.28 40.06 None 7600 850 59 450 760 ND MW9 10/5/1999 13.32 8.71 48.28 39.57 None 1100 6.1 8.4 ND 6.7 ND MM 1/27/2000 13.11 8.13 48.28 40.15 None 14000 860 74 790 1900 ND MW9 4/20/2000 13.09 7.97 48.28 40.37 None 13000 1300 100 710 1400 ND MW9 7/19/2000 12.21 8.93 48.28 39.35 None 11000 950 57 590 1200 ND MW9 10/17/2001 12.31 10.07 48.28 38.21 Yes 66000 3100 850 4800 19000 ND MW9 1/17/2001 12.31 9.29 48.28 38.99 None 19000 550 150 1400 4700 ND MW9 4/24/2001 12.21 8.92 48.28 39.36 Yes 78000 1200 540 4100 16000 ND MW9 7/31/2001 12.31 9.32 48.28 38.96 Yes-.30 ft 46000 850 330 3100 12000 ND MW9 11/16/2001 12.21 10.1 48.28 38.16 Yes-.65 R 54000 1300 480 4100 15000 ND MW9 4/30/2002 12.21 8,78 48.28 39.5 Yes-.03 ft 49000 e20 190 3500 13000 ND MW9 8/5/2002 12.21 8.73 48.28 39.55 YES.25 71000 1200 360 4700 16000 ND MW9 12/23/2002 13-61 7.81 48.28 40.47 YES 0.03 190000 940 310 5100 17000 ND MW9 4/8/2003 12.21 8.65 48.28 39.63 8.6 47000 500 100 2100 6100 ND MW9 8/26/2003 12.21 9.58 48.28 38.7 9.27 380000 320 ND 3100 11000 ND MW9 10/30/2003 12.21 10.21 48.28 38.07 YES 9.7 690000 550 ND 9800 34000 ND MW9 1/12/2004 12.21 9.08 48.28 39.2 8.75 88000 800 110 4400 11000 ND MW9 6/8/2004 NIA WELL REMOVED FOR REMED- iATION M W9R 11/19/2004 20.1 9.22 48.28 39.08 None 3900 39 16 250 340 ND