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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 I TPH-G Benzene Toluene Ethylbenzene Total Xylenes
<br /> SP-1 08/18/1999 20,000 3,300 430 890 4,200
<br /> 11/08/1999 18,000 2,800 360 780 4,100
<br /> `* 03/13/2000 20,000 1,400 260 560 2,390
<br />' 07/02/2000 17,000 1,900 260 800 3,600
<br /> 10/19/2000 26,000 2,000 220 960 4,000
<br /> 1 SP-2 11/08/1999 4,000 24 11 15 17
<br /> "* 03/13/2000 ND(50) 39 ND(0 5) 13 72
<br /> 07/02/2000 3900 25 48 19 53
<br /> 10/19/2000 6100 33 46 ND(5 0) 2100
<br /> SP-5 08/18/1999 410 13 18 - 22 83
<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 /> 08/98/1999 21,000 3,700 2,800 820 3,500
<br /> 1 11/08/1999 1,800 190 38 87 71
<br /> ** 03/13/2000 1,400 190 84 44 170
<br /> 07/02/2000 1,400 230 69 120 140
<br /> 10/19/2000 35,000 4,600 5,200 1600 6,100
<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 /> I 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 /> 1 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 82606
<br /> ** TPH-G results reported using Method 8020/8015, 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 /> soil vent and air sparge pilot test performed in this area
<br /> env/624001321121382eg/stockton/histlab
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