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Figure 9. Contaminant Concentration Trends in ATR-4 <br /> MtBE in ATR-4 <br /> 9000 <br /> 7500 - <br /> 6000 - <br /> 0 <br /> 5006000o • MtBE <br /> A 4500 <br /> Linear(MtBE) <br /> m 3000 <br /> 0 1500 - <br /> U ♦ • <br /> 0 <br /> 912011995 2/1/1997 6/16/1998 10/29/1999 3/12/2001 7/25/2002 12/7/2003 4/20/2005 <br /> Date <br /> Benzene in ATR-4 <br /> 2,000 <br /> J <br /> CD 1,600 <br /> 3 • <br /> 0 1,200 ♦ Benzene <br /> w <br /> 800 —Linear(Benzene) <br /> m • <br /> u • <br /> C 400 - <br /> 0 <br /> V ♦ ♦ N~♦ • <br /> 0 <br /> 2/19/1986 11/15/1988 8/12/1991 5/8/1994 2/1/1997 10/29/1999 7125/2002 4/2012005 <br /> Date <br /> I <br /> i <br />