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i <br /> CONCENTRATION(ppb) <br /> f o • <br /> 10/2/1998 <br /> 1/28/1999 <br /> z <br /> - d <br /> 5/14/1999 <br /> 9/2/1999 ' <br /> 12/21/t999 <br /> Nz <br /> 7/7/2000 <br /> � G <br /> '= o <br /> 12/28/2000 ' 01 <br /> 8/16/2001 c <br /> rt ' <br /> P H <br /> - n0 <br /> 12/11/200 1 � <br /> 7/3/2002 ' <br /> 2/3/2004 ' <br /> 7/12/2004 , <br /> _ 1 <br /> 3/31/2005 <br /> 8/19/2005 <br /> 0 <br /> � t <br />