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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 /> (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 /> 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 /> 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 /> " Laboratory reports not typical of gasoline <br /> ** BTEX results for these samples reported using EPA Method 8260B <br /> ** TPH-G results reported using Method 802018015, but,these samples <br /> were analyzed outside of recommended 14 day hold time <br /> Note November 15, 1994 samples collected from piezometers PZ-1 and PZ-2 followed a 2-week <br /> sod vent and air sparge pilot test performed in this area <br /> envJ624001321121382eg/stockton/histlab <br />