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Concentration(ppb) <br /> N W A Ch 0) -4 CO <br /> O O P O O O O O <br /> p O O d O O O O <br /> CD <br /> O O O O O O O O O <br /> 8/20/1997 <br /> 10/20/1997 <br /> 12/20/1997 <br /> 2120/1998 <br /> 412011998 - <br /> 6/2011998 - <br /> 8/20/1998 - <br /> 10/20/1998 <br /> 120119986/20/19988/20/199810/20/1998 <br /> 12120/1998 <br /> 2/2011999 <br /> 4/20/1999 - <br /> 6/20/1999 - <br /> 8/20/1999 <br /> 120119996/20/19998/20/1999 <br /> 10/20/1999 <br /> 12/20/1999 <br /> 2/20/2000 j <br /> 3 <br /> 4120!2000 m <br /> 6/20/2000 <br /> f7 <br /> 8120/2000 - <br /> 10120/2000 7 <br /> 1212012000 <br /> 2/20/200 � <br /> 4/20/2001 p <br /> 6/20/200 <br /> 8120120011 = <br /> 0 <br /> 10/20/2001 <br /> 12/2012001 <br /> 2120/2002 - <br /> 412012002 - <br /> 6120/2002 - <br /> 8/2012002 - <br /> 10/2012002 <br /> /20/2002 4/20/20026/20/20028/20/200210/20/2002 <br /> 12/20/2002 <br /> 2/20/2003 - <br /> 4/20/2003 - <br /> 6/20/2003 - <br /> 8/20/2003 - <br /> 10/2012003 <br /> /20/20034/20/20036/20/20038/20/200310/20/2003 <br /> 1 2/2 012 00 3 <br /> 2/2012004 - <br /> 4/20/2004 - <br /> 6120/2004 <br /> 120120 044/20/20046/20/2004 <br /> 8/20/2004 - <br /> 10/20/2004 <br />