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CONCENTRATION(ppb) <br /> o <br /> 10/2/1998 <br /> 1/28/1999 <br /> z <br /> d <br /> 5/14/1999 <br /> 9/2/1999 <br /> 12/21/1999 tz <br /> m <br /> � z <br /> � N <br /> � z <br /> C <br /> 7/7/2000 <br /> m <br /> � n <br /> d <br /> CD <br /> y 12/28/2000 s y <br /> o <br /> 0 <br /> 8/16/2001 <br /> a <br /> z <br /> d <br /> 12/11/2001 <br /> z <br /> d <br /> 7/3/2002 <br /> z <br /> 2/3/2004 C7 <br /> 7/12/2004 <br /> z <br /> 3/31/2005 d <br />