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CONCENTRATION(ppb) <br /> N .P CD Oa O N ? OOo O N • <br /> O O OO O O O O O O O <br /> O O 4 O O O O O O Q O <br /> Q o o a o 0 0 0 0 0 a a <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 /> 8/7/2001 <br /> b <br /> 11/7/200 1 <br /> 1/7/2001 xe <br /> IZ <br /> n <br /> 2/7/2002 0 <br /> n � <br /> C 5/7/2002 Z • <br /> �3 <br /> 8/7/2002 <br /> 0. <br /> F� <br /> 11/11/2002 <br /> 2/5/2003 <br /> 5/23/2003 <br /> 8/13/2003 <br /> 11/5/2003 <br /> 2/12/2004 lll-�F <br /> 5/11/2004 <br /> 8/6/2004 <br /> 11/23/2004 <br /> 2/9/2005 �� <br />