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Table 4 Historical Groundwater Sample TPH-G and BTEX Analytical Results The Earthgrains Company Stockton, Califomia ' Concentration (ug/1) Well Date TPH-G Benzene Toluene Ethylbenzene Total Xylenes 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) 16 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(O 5) 08/18/1999 380 11 15 18 72 CPT-1@45' 05/18/1999 ND (50) ND (0 5) 0 8 ND (0 5) ND (0 5) CPT-1@85' 05/18/1999 ND (50) ND (0 5) ND (0 5) ND (0 5) ND (0 5) ' CPT-2@44' 05/18/1999 ND (50) ND (0 5) ND (0 5) ND (0 5) ND (0 5) CPT-2@79' 05/18/1999 100 066 ND(0 5) 0 51 1 3 CPT-3@44' 05/18/1999 ND (50) ND (0 5) ND (0 5) ND (0 5) ND (0 5) CPT-3@76' 05/18/1999 '100 ND (0 5) ND (0 5) ND (0 5) 2 3 ' SP-1 08/18/1999 20,000 3,300 430 890 4,200 SP-5 08/18/1999 410 13 18 22 83 PZ-1 10/27/1994 21,000 4,200 2,500 1,300 4,800 (see note) 11/15/1994 12,000 1,800 1,400 350 3,100 ' 08/18/1999 21,000 3,700 2,800 $20 3,500 PZ-2 10/27/1994 31,000 5,300 3,300 1,400 5,700 1 (see note) 11/15/1994 25,000 4,000 3,000 600 4,800 08118/1999 16,000 230 340 760 2,600 ND Not detected at or above laboratory detection limit shown in parentheses TPH-G Total petroleum hydrocarbons as gasoline ugll Micrograms per liter Laboratory reports not typical of gasoline NT Not Tested Note November 15, 1994 samples collected from piezometers PZ-1 and PZ-2 followed a 2-week soil vent and air sparge pilot test performed in this area Pa e5of5 E 112138211259771Histlab XLS - 10/08/1999 9