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CONCENTRATION(ppb) <br /> o a <br /> 10/2/1998 <br /> 1/28/1999 <br /> 5/14/1999 <br /> 9/2/1999 <br /> 12/21/1999 <br /> to <br /> 7/7/2000 N N <br /> I <br /> � n <br /> 12/28/2000 �^ O <br /> d <br /> tz <br /> z <br /> � n <br /> 8/16/2001 y <br /> � o <br /> 12/11/2001 a O <br /> z <br /> 7/3/2002 <br /> 2/3/2004 <br /> 7/12/2004 <br /> 3/31/2005 <br /> 8/19/2005 <br /> • <br /> 5/9/2005 <br />