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CONCENTRATION(ppb) <br /> N N w W ? . <br /> 0 o a o � o o o 0 <br /> 0 0 0 0 0 0 o a o 0 0 <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 — y <br /> �o <br /> x <br /> 8/7/2001 QrQ <br /> a <br /> 11/7/2001 <br /> � y <br /> 2/7/2002 °o <br /> m n <br /> e o <br /> d 5/7/2002 Z <br /> y r20 <br /> 8/7/2002 <br /> 11/11/2002 <br /> M y <br /> 0 <br /> 2/5/2003 <br /> 5/23/2003 <br /> 8/13/2003 <br /> 11/5/2003 <br /> 2/12/2004 <br /> 5/1112004 <br /> 8/6/2004 <br /> 11/23/2004 <br /> 2/9/2005 - <br />