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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 Datel TPH-G Benzene Toluene Ethylbenzene Total Xylenes <br /> 1PZ-1 10/27/1994 21,000 4,200 2,500 1,300 4,800 <br /> (see note) 11/15/1994 12,000 1,800 1,400 350 3,100 <br /> 08/18/1999 21,000 3,700 2,800 820 3,500 <br /> 11/08/1999 1,800 190 38 87 71 <br /> PZ-2 10/27/1994 31,000 5,300 3,300 1,400 5,700 <br /> (see note) 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 /> ND Not detected at or above laboratory detection limit shown in parentheses <br /> TPH-G Total petroleum hydrocarbons as gasoline <br /> ugll Micrograms per liter <br /> 1Laboratory reports not typical of gasoline <br /> NT Not Tested <br /> Note November 15, 1994 samples collected from piezometers PZ-1 and PZ-2 followed a 2-week <br /> soil vent and air sparge pilot test performed in this area <br /> E\121382\1259771Histlab XLS- 12/10/1999 Page 6 of 6 <br />