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CONCENTRATION(ppb) <br /> o <br /> 10/2/1998 <br /> 1/28/1999 z <br /> d <br /> 5/14/1999 <br /> 9/2/1999 <br /> 12/21/1999 <br /> G7 <br /> Nz <br /> 7/7/2000 <br /> az <br /> R <br /> 12/28/2000 °= <br /> d • <br /> _ z <br /> � � zW <br /> > 8/16/2001CD <br /> o y <br /> N <br /> [C <br /> C C <br /> ro a y <br /> 12/11/2001 <br /> z <br /> 7/3/2002 <br /> 2/3/2004 <br /> 7/12/2004 <br /> 3/31/2005 <br /> 8/19/2005 <br /> 5/9/2006 <br /> z <br /> d <br /> 3 <br />