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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-9 03/23/1994 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 06/07/1994 ND(50) ND(0 3) ND(0 3) ND(0 3) 072 09/07/1994 ND(50) 052 1 1 0 81 3 0 ' 02/1211996 ND(50) ND(0 3) ND(0 3) ND(0 3) ND(0 5) 05/14/1996 53 ND(0 5) ND(0 5) ND(0 5) ND(0 5) 12116/1996 ND(50) ND(0 5) 063 22 2 2 07/15/1997 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 05/28/1999 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 08/18/1999 340 12 13 16 64 11/08/1999 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) MW-10 03/23/1994 3,800 17 6 6 7 5 6 5 06/07/1994 1,400 43 51 86 64 09/08/1994 2,400 9 2 2 1 44 1 6 02/12/1996 ND(50) ND(0 3) ND(0 3) ND(0 3) ND(0 5) 05/14/1996 210 1 2 073 0 63 1 2 09/17/1996 300 55 4 7 2 8 6 0 12/16/1996 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 07/15/1997 240 1 4 ND(<0 5) 06 ND(0 5) 10/23/1997 130 066 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 340 1 0 057 1 0 ND(0 5) 05/28/1999 160 2 8 0 51 0 7 057 ' 08/18/1999 440 150 18 220 83 11/08/1999 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) MW-11 03/23/1994 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 06/07/1994 ND(50) 052 ND(0 3) 088 1 9 09/08/1994 ND(50) ND(0 3) 072 058 2 4 02/12/1996 ND(50) ND(0 3) ND(0 3) ND(0 3) ND(0 5) 05/14/1996 ND(50) ND(0 5) 066 ND(0 5) ND(0 5) 12/16/1996 ND(50) ND(0 5) ND(0 5) 22 1 8 07/15/1997 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 1 10/23/1997 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 05/21/1998 NT ND(10) ND(10) ND(10) ND(10) 10/2811998 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 05/28/1999 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 1 E\121382\1259771Histlab XLS - 12/1011999 Page 4 of 6