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' Table 4
<br /> Historical Groundwater Sample TPH-G and BTEX Analytical Results
<br /> The Earthgrams Company
<br /> t Stockton California
<br />' Concentration (ugll)
<br /> Well Date TPH-G Benzene Toluene Ethylbenzene Total Xylenes
<br />' PZ-1 10/27/1994 21,000 4,200 2,500 1,300 4,800
<br /> 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 /> 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 1,600 6,100
<br /> 5�J1tk5 ct 01/18/2001 4,700 620 570 190 890
<br /> �i' 04/20/2001 6,700 650 750 410 850
<br /> 07/18/2001 23,000 3,700 3,200 1,300 5,300
<br /> 10/23/2001 33,000 5,100 4,900 1,700 7,100
<br /> 01/24/2002 24,000 3,800 2,800 1,300 5,200
<br /> *** 04/26/2002 2,800 370 56 160 190
<br /> ' 08/02/2002 3_,300__ 280 89 80 330
<br /> 11/06/2002 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(1 0)
<br /> 02/06/2003 450 75 17 17 46
<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 /> 5 �--�
<br /> q4/20/2001_ 7,000_ 2200 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 9000 rr ND(?_5) 77 130 500
<br /> 02/05/2403 11,000 N6(5 0) 11 130 390
<br /> ' ND Not detected at or above laboratory detection limit shown in parentheses
<br /> TPH-G Total petroleum hydrocarbons as gasoline
<br /> tIgll 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 03/14/2002
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<br /> env/624001 32/121 382eg/stockton/histlab
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