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Concentration (µg/L) <br /> r� w CD v <br /> O O O O O O Q <br /> Aug-96 <br /> Nov-96 <br /> Feb-97 f <br /> May-97 <br /> Aug-97 <br /> Nov-97 <br /> Feb-98 <br /> May-98 <br /> Aug-98 � <br /> Nov-98 <br /> a <br /> Feb-99 <br /> y <br /> May-99 to <br /> y Aug-99 <br /> rD Nov-99 1 <br /> Feb-00 � C <br /> May-00 <br /> Aug-00 % y <br /> Nov-00 <br /> Feb-01 \ rp <br /> y <br /> May-O 1 <br /> Aug-01 <br /> Nov-01 ti <br /> Feb-02 <br /> May-02 <br /> Aug-02 <br /> Nov-02 <br /> w w <br /> a. <br /> 5' <br /> f <br />