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ISM r M M M i M i <br /> Figure '!5. Contaminant Co. centratio <br /> n Trends in ATR-7 S <br /> MtBE in ATR-7 <br /> 700 <br /> 600 • <br /> 3 <br /> 500 - <br /> 2 400 • MtBE <br /> 4.1 <br /> 300 <br /> Poly (MtBE) <br /> 200 • <br /> 00 100 <br /> 0 <br /> 518!1994 5/27/1996 6/16/1998 7/5/2000 7/25/2002 8/13/2004 <br /> Date <br /> Benzene in ATR-7 <br /> 12 <br /> J 10 <br /> 3 $ <br /> o • Benzene <br /> 6 — <br /> ---Linear(Benzene) <br /> d 4 <br /> 0 2 <br /> U <br /> 0 <br /> 11/15/1988 8/12/1991 5/8/1994 2/1/1997 10/29/1999 7/25/2002 4/20/2005 <br /> Date <br /> I <br /> 1 <br />