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Table 4 <br /> Historical Groundwater Sample TPH-G and BTEX Analytical Results <br /> The Earthgrains Company <br /> Stockton, California <br /> ' Concentration (ug/1) <br /> Well Date TPH-G Benzene Toluene Ethylbenzene Total Xylenes <br /> PZ-2 10/27/1994 31,000 5,300 3,300 1,400 5,700 <br /> 11/15/1994 25,000 4,000 3,000 600 4,800 <br /> 08/18/1999 16,000 230 340 760 2,600 <br /> 11/08/1999 1,300 18 24 61 170 <br /> 03/13/2000 11,000 31 240 250 990 <br /> 07/02/2000 13,000 60 76 470 1,200 <br /> 10/19/2000 17,000 81 100 450 1,500 <br /> 01/18/2001 6,200 14 25 230 650 <br /> 04/20/2001 27,000 200 110 450 1,800 <br /> 07/19/2001 16,000 35 74 320 1,100 <br /> 10/23/2001 14,000 140 18 220 620 <br /> 01/24/2002 15,000 ND(50) 91 270 990 <br /> * * 04/26/2002 17,000 ND(2 0) 320 310 1,500 <br /> 08/02/2002 18,000 4 8 260 310 1,300 <br /> 11/05/2002 9,000 ND(2 5) 77 130 500 <br /> ND Not detected at or above laboratory detection limit shown in parentheses <br /> TPH-G Total petroleum hydrocarbons as gasoline <br /> ug/l Micrograms per liter <br /> Laboratory reports not typical of gasoline <br /> *** Samples collected on 04/26/2002 were from first monitoring event since the installation <br /> of new air sparging well SP-A on 03/1412002 <br /> 1 <br /> S <br />' env1624001321121382eglstocktonlhistlab <br />