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Table 4 Histoncal Groundwater Sample TPH-G and BTEX Analytical Results The Earthgrains Company Stockton, California Concentration (ug/1) Well Date TPH-G Benzene Toluene Ethylbenzene Total Xylenes MW-12 03/23/1994 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 06/07/1994 ND(50) 045 ND(0 3) 0 82 1 6 09/08/1994 ND(50) ND(0 3) 0 81 069 2 8 02/12/1996 310 31 5 2 4 11 1 05/14/1996 600 74 1 8 16 19 12/16/1996 900 16 31 27 4 3 07/15/1997 2,000 85 26 12 ND(2 5) 10/23/1997 4,100 32 ND(5 0) 19 ND(5 0) 01/29/1998 NT 17 ND(5 0) ND(5 0) ND(5 0) 05/21/1998 NT 26 36 66 36 10/28/1998 1900 11 ND(5 0) 8 5 6 2 05/28/1999 2200 18 5 5 2 9 2 6 08/18/1999 1000 57 50 44 170 11/08/1999 1700 14 44 2 2 1 2 IMW-13 03/23/1994 6,500 99 19 30 330 06/07/1994 7,100 150 26 42 420 09/08/1994 6,800 160 24 51 150 02/12/1996 2,600 49 6 20 78 05/15/1996 5,000 65 32 41 74 09/16/1996 2,100 21 18 8 6 27 12/16/1996 69 ND(0 5) 1 6 ND(0 5) 1 3 07/15/1997 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 10/23/1997 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 01/29/1998 NT ND(5 0) ND(5 0) ND(5 0) ND(5 0) 10/28/1998 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 05/28/1999 190* ND(0 5) ND(0 5) ND(0 5) ND(0 5) 08/18/1999 380 11 15 18 72 11/08/1999 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) CPT-1 @45' 05/18/1999 NO (50) NO (0 5) 0 8 NO (0 5) NO (0 5) CPT-1 @85' 05118/1999 NO (50) NO (0 5) NO (0 5) NO (0 5) NO (0 5) CPT-2@44' 05/18/1999 NO (50) NO (0 5) NO (0 5) NO (0 5) NO (0 5) CPT-2@79' 05/18/1999 100 066 ND(0 5) 0 51 1 3 CPT-3@44' 05/18/1999 NO (50) NO (0 5) NO (0 5) NO(0 5) ND (0 5) CPT-3@76' 05/18/1999 '100 ND (0 5) NO (0 5) NO(0 5) 2 3 SP-1 08/18/1999 20,000 3,300 430 890 4,200 ' 11/08/1999 18,000 2,800 360 780 4,100 SP-2 11/08/1999 4,000 24 11 15 17 SP-5 08/18/1999 410 13 18 22 83 E\121382\1259771Histlab XLS- 12/1011999 Page 5 of 6