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CONCENTRATION(ppb) <br /> N N W W • <br /> O Vf O to O VO <br /> O O O O O O O O O O O <br /> 11/22/1999 <br /> 2/17/2000 <br /> 5/24/2000 <br /> 8121/2000 <br /> 11/3/2000 <br /> 2/27/2001 <br /> 5/16/2001 <br /> 8/7/2001 <br /> x <br /> 11/7/2001 na <br /> 2/7/2002 <br /> � y <br /> 5/7/2002 <br /> 8/7/2002 <br /> d ozW <br /> a 11/11/2002 <br /> 'D <br /> 5/2312003 <br /> 2/5/2003 'D <br /> n <br /> r" 5/23/2003 " <br /> 0 <br /> 8/13/2003 Z <br /> 11/5/2003 <br /> 2/12/2004 <br /> 5/11/2004 <br /> 8/6/2004 <br /> 11/23/2004 <br /> 2/9/2005 <br /> 6/1/2005 <br /> 8/24/2005 <br /> 12/19/2005 <br /> i <br />