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CONCENTRATION (ppb) <br /> N w w A ? U <br /> in O i!i O U O U O <br /> O p O Q O O O O O O O <br /> 11/22/99 <br /> 2/17/00 <br /> 5/24/00 <br /> 8/21100 <br /> 11/3/00 <br /> y <br /> 2/27/01 <br /> 100x <br /> a <br /> 5/16/01 y <br /> r� <br /> 8/7/01 <br /> n . <br /> y11/7/01 <br /> H <br /> 2/7/02 <br /> O <br /> 5/7/02 <br /> 77 t7 <br /> 8/7/02 <br /> 11/11/02 <br /> 2/5/03 <br /> 5/23/03 <br /> 8/13/03 <br /> 11/5/03 �� <br />