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Table 6 Historical Groundwater Sample TPH-G and BTEX Analytical Results The Earthgrams Company Stockton, California Concentration (ug/1) Well MitAl 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) 082 1 6 09/08/1994 ND(50) ND(0 3) 081 069 2 8 02/12/1996 310 31 5 2 4 11 05/14/1996 600 74 1 8 16 19 12/16/1996 900 16 31 27 4 3 ' 07/15/1997 2,000 8 5 2 6 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 55 2 9 2 6 08/18/1999 1000 57 50 44 170 11/08/1999 1700 14 4 4 22 1 2 *` 03/13/2000 11,000 5 9 ND(5 0) ND(5 0) ND(5 0) 07/02/2000 1,500 26 42 94 47 MW-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) 10128/1998 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) ** 03/15/2000 67 ND(0 5) ND(0 5) ND(0 5) ND(0 5) 1 07/02/2000 180 6 2 20 51 28 CPT-1@45' 05/18/1999 NO (50) NO(0 5) 0 8 ND (0 5) NO(0 5) CPT-1@85' 05/18/1999 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) NO(0 5) CPT-3@76' 05/18/1999 *100 NO (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 ** 03/13/2000 20,000 1,400 260 560 2,390 07/02/2000 17,000 1,900 260 800 3,600 env/62400132/121382eg/stockton/histlab