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MTBE CONCENTRATION (ppb) <br /> 1 Q <br /> Q �• <br /> May-01 <br /> Jun-01 f <br /> Jul-01 m <br /> m <br /> 0 <br /> Aug-01 0 <br /> z <br /> 1 m <br /> T ! t m <br /> Sep-01 z <br /> Oct-01 <br /> Z <br /> cn c <br /> Nv Nov-01 cn m <br /> Dec-01 <br /> m <br /> z <br /> Jan-02 cn <br /> m <br /> Feb-02 <br /> r <br /> � r <br /> Mar-02 to <br /> i <br /> r <br /> Apr-02 <br /> May-02 <br /> r <br /> t <br /> Jun-02 <br />