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Concentration(ppb) <br /> o � <br /> o o Q o <br /> 1/18/1989 <br /> 10/12/1989 <br /> 12/13/1990 <br /> ' <br /> 3/13/1991 - <br /> 6/17/1991 <br /> 3/16/1992 - <br /> 6/211992 - <br /> 911711992 - <br /> 12/15/1992 <br /> 116!1992 6/2/19929/17/19921211511992 ' <br /> 3/12/1993 - <br /> 6/30/1993 - <br /> 8/31/1993 - <br /> 12/M1993 <br /> 112119936/30/1993 8/31/199312!1611993 <br /> 4/29/1994 ' <br /> 9/27/1994 <br /> n <br /> 7/27/1995 M <br /> 11/16/1995 � <br /> 2!711996 rtn <br /> z 5/21/1996 = O <br /> iz 8/28/1996 3 , ' <br /> m 12/30/1996 ::l <br /> (D 3i2!2111997 � <br /> z 5/9/1997 m <br /> 8/13/1997 <br /> 11/6/1997 t <br /> 2/13/1998 <br /> 5/19/1998 ' <br /> 8/6/1998 <br /> 11/5/1998 <br /> 2/24/1999 <br /> 5/11/1999 <br /> 8/10/1999 <br /> 1 1 1811 999 ' <br /> 218/2000 - <br /> 5/212000 ' <br /> 8/10/2000 <br /> 11/14/2000 <br /> 2/9/2001 I <br /> 5/22/2001 <br /> 8/6/2001 • <br /> 11/9/2001 ' <br /> I <br />