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CONCENTRATION (ppb) <br /> N ? T 00 O N A Ql DO O N <br /> Q Q OO O O O O O O O <br /> O O o o O O O O O O d <br /> O O O O O O Q Q O O O O <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 <br /> Cyd <br /> 2/7/2002 x <br /> b <br /> 5/7/2002 — n <br /> Wiz° <br /> 8/7/2002 . <br /> d o z � <br /> a 11/11/2002 H <br /> b � � <br /> " 2/5/2003 �] <br /> n <br /> 5/23/2003K-- <br /> 8/13/2003 <br /> 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/l/2005 <br /> 8/24/2005 <br /> 12/19/2005 •J <br />