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i f i <br /> CONCENTRATIONS VS TIME - MW-7 <br /> 140,000 - <br /> 120,000 <br /> 100,000 <br /> J <br /> 0 <br /> z 80,000 - <br /> 0 TPN-G <br /> —�MTBE <br /> f- <br /> w 60,000 <br /> z <br /> 0 <br /> 40,000 <br /> 20,000 - <br /> 0 - <br /> 24-Jul-98 <br /> 0,000 024-Jul-98 06-Dec-99 19-Apr-01 01-Sep-02 14-Jan-04 28-May-05 10-Oct-06 <br /> DATE <br />