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CONCENTRATION(ppb) <br /> o <br /> 10/2/98 <br /> 1/28/99 <br /> 5/14/99 <br /> 9/2199 <br /> Gd <br /> N Z <br /> 12/21/99 <br /> � z <br /> � o <br /> 7/7/00 <br /> o y <br /> N <br /> 12/28/00 C� <br /> O <br /> z <br /> 8/16/01 <br /> 12/11/01 <br /> 7/3/02 <br /> 213/04 <br /> 7/12/04 <br />