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CONCENTRATION(ppb) <br /> O 4 d <br /> O d O O Q d O d d <br /> 11/22/1999 <br /> 2/17/2000 <br /> 5/24/2000 <br /> 8/21/2000 <br /> 11/3/2000 <br /> 2/27/2001 <br /> 5/16/2001 <br /> y <br /> b <br /> x <br /> 8/7/2001 a. <br /> � O <br /> 11/7/2001 <br /> _ C,o <br /> � m zW <br /> 2/7/2002 y <br /> 5/7/2002 O <br /> z <br /> 8/7/2002 <br /> 11/11/2002 <br /> 2/5/2003 <br /> 5/23/2003 <br /> 8/13/2003 <br /> 11/5/2003 <br /> 2/12/2004 <br /> 5/11/2004 • <br />