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Concentration(ppb) <br /> G O <br /> 1/18/1989 - <br /> 1011211989 <br /> 12113/1990 <br /> 3/13/1991 <br /> 6/17/1991 <br /> 3/16/1992 <br /> 0 <br /> m <br /> o m <br /> m 6/2/1992 <br /> c� <br /> N H .�.► <br /> m su m <br /> N <br /> 9/17/1992 <br /> . <br /> co <br /> Y W <br /> m <br /> 12!15/1992 <br /> V <br /> 3/12/1993 <br /> 6/30/1993 <br /> I <br /> i <br /> 8/31/1993 <br /> 12/16/1993 <br /> 4/29/1994 <br /> (. <br /> 11/16/1995 <br />