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Concentration(ppb) <br /> N N W <br /> O O 4 O O O O O <br /> 8/20/1997 <br /> 10/20/1997 <br /> 12/20/1997 • <br /> 2/20/1998 - <br /> 4/20/1998 - <br /> 6/20/1998 - <br /> 8/20/1998 <br /> /20/19984/20/19986/20/19988/20/1998 <br /> 10/20/1998 <br /> 12/20/1998 <br /> 2/20/1999 - <br /> 4120/1999 - <br /> 6/20/1999 <br /> /20/19994/20/1999612011999 <br /> 8/20/1999 - <br /> 10120/1999 <br /> 12/20/1999 <br /> 2/20/2000 3 <br /> m <br /> 4/20/2000 <br /> 6/20/2000 0 <br /> 8120/2000 - <br /> 10120/2000 <br /> 1201200010/20/2000 rt <br /> 12/20/2000 <br /> 2/20/2001 3 • <br /> + <br /> 4/20/2001 <br /> 6/20/2001 m <br /> 8/20/2001 <br /> 10/20/2001 <br /> 12/20/2001 <br /> I � <br /> CD <br /> W <br /> 2/20/2002 <br /> 4/20/2002 rn <br /> 6/20/2002 - < <br /> 8/20/2002 - <br /> 10/20/2002 <br /> 12/20/2002 <br /> 2/20/2003 - ZI <br /> 4/20/2003 - <br /> 6120/2003 - <br /> 8120/2003 - <br /> 10/20/2003 <br /> /20/20036/20/200381201200310/20/2003 <br /> 12120/2003 <br /> 2/20/2004 - <br /> 4/20/2004 - <br /> 6/2012004 - <br /> 8120/2004 - <br /> 10120/2004 <br /> /20/20044/20/20046120120048/20/200410/20/2004 <br />