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i <br /> MTBE Concentration (micrograms per liter) <br /> O O O O O <br /> O O O O - O - <br /> O O O O O O <br /> Apr-00 <br /> Aug-00 <br /> Dec-00 <br /> Apr-01 <br /> Aug-01 ' <br /> Dec-01 <br /> Apr-02 <br /> Aug-02 l <br /> �II <br /> Nov-02 i <br /> w <br /> � N <br /> Mar-03I w <br /> Jul-03 w o <br /> � � o <br /> Nov-03 . : p <br /> f 0* <br /> r � <br /> Mar-04 <br /> Jul-04 0 �CDyy <br /> C y <br /> Nov-04 co <br /> Mar-0S o <br /> fD . <br /> Jul-05 <br /> Nov-05 <br /> Mar-06 <br /> Jul-06 <br /> Nov-06 <br /> Mar-07 <br /> Jul-07 <br /> C w <br /> Nov-07 <br /> Mar-08 <br /> Jul-08 <br /> � ? N <br /> Oct-08 <br /> ewe <br />