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MTBE CONCENTRATION (ppb) <br /> 0 <br /> Q o <br /> C) 0 0 0 <br /> May-01 <br /> Jun-01 <br /> I <br /> Jul-01 <br /> W <br /> m <br /> n <br /> j Aug-01 z <br /> T m <br /> z <br /> Sep-01 <br /> Z <br /> n Oct-01 cn m <br /> W <br /> m � <br /> IM <br /> w z <br /> Nov-01 N <br /> � m <br /> m <br /> Deo-01 r <br /> r <br /> Jan-02 <br /> Feb-02 <br /> Mar-02 <br /> • <br />