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Figure 11 . Contaminant Concentration Trends in ATR-5 <br /> MtBE in ATR-5 <br /> 250 , <br /> Q, 200 <br /> 150 ♦ MtBE <br /> 100 Poly. (MtBE) <br /> 0 50 <br /> 9/20/1995 21'(11997 6/16/1998 10/29/1999 3/12/2001 7/25/2002 12/7/2003 4/20/2005 <br /> Date <br /> Benzene in ATR-5 <br /> 750 <br /> J � <br /> 3 600 <br /> 0 450 <br /> ♦ Benzene <br /> 300 —Linear(Benzene) <br /> m <br /> U <br /> 0 150 <br /> U � <br /> 0 <br /> 2/19/1986 11/15/1988 8/12/1991 5/8/1994 2/1/1997 10/29/1999 7/25/2002 4/20/2005 <br /> Date <br />