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CONCENTRATION(ppb) <br /> O O O O O O O O O O <br /> O O O O O O d 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 y <br /> IV <br /> x <br /> 5/16/2001 w <br /> p <br /> R+ <br /> r� <br /> 8/7/2001 0 <br /> 11/7/2001 A <br /> tz <br /> 2/7/2002 H <br /> m 5/7/2002 <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 /> s , su <br />