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CONCENTRATION (ppb) <br /> N A d\ 00 O N A <br /> O CD 00 O N <br /> p O O O 4 <br /> O d O O O <br /> Q O O O O O O O O O O <br /> O O O O O O O O O 4 O 4 <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 /> 11/7/2001 ,y <br /> .r b <br /> 2/7/2002 px. <br /> 5/7/2002 <br /> — m <br /> C7 8/7/2002 e Z w <br /> a � y <br /> x 11/11/2002 <br /> r� y <br /> 2/5/2003 <br /> CDCD <br /> 5/23/2003 <br /> 8/13/2003 <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 />