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1 <br /> CONCENTRATION (ppb) <br /> P I <br /> 0 0 <br /> 10/2/1998 <br /> 1/28/1999 <br /> I <br /> 5/14/1999 <br /> 9/2/1999 <br /> 12/21/1999 <br /> tzm <br /> Nz <br /> � N <br /> 7/7/2000 <br /> a+ O <br /> d ' <br /> 12/28/2000 � n <br /> d ro <br /> y � y <br /> � 8/16/2001 ° <br /> � y <br /> ap <br /> z <br /> 12/11/2001 <br /> 7/3/2002 <br /> 2/3/2004 <br /> 7/12/2004 <br /> 3/31/2005 ' <br /> 8/19/2005 <br />