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MTBE CONCENTRATIONS VS TIME <br /> 50,000 <br /> Ozone injection <br /> began June 2004 <br /> 45,000 - <br /> 40,000 <br /> 5,00040,000 — <br /> 35,000 - - <br /> J <br /> D <br /> =1 30,000 <br /> N <br /> Z <br /> O <br /> 25,000 <br /> Z <br /> v 20,000 <br /> Z <br /> O <br /> V <br /> 15,000 <br /> 10,000 <br /> 5,000 <br /> 0 <br /> 4/19/2001 1115/2001 5124/2002 12/1012002 6/28/2003 1/1412004 8/1/2004 2/17/2005 9/5/2005 <br /> DATE <br />