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Concentration(ppb) <br /> i <br /> 10/1/1987 <br /> 21211988 - <br /> 6/24/1988 <br /> 1/18/1989 <br /> 10/12/1959 <br /> 12113/1990 <br /> 3/13/1991 <br /> 6/17/1991 <br /> 311611992 - <br /> 61211992 - n <br /> 9/17/1992 <br /> O m <br /> 00 12/15/1992 N w.r <br /> O •z e 3/12/1993 <br /> m m <br /> m 6/30/1993 <br /> CU <br /> �° <br /> 8/31/1993 m <br /> G N <br /> 12/16/1993 <br /> 4/29/1994 - <br /> 9/27/1994 - <br /> 7/27/1995 - <br /> /29/19949/27/19947/27/1995 <br /> 11/16/1995 <br /> 12/30/1996 <br /> 8/13/1997 <br /> 8/6/1998 - <br /> 8110/1999 - <br /> 8/10/2000 - <br /> 8/612001 <br /> /6/19988110119998/10/20006/6/2001 • <br />