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Concentration(ppb) ' <br /> o <br /> o o v o <br /> 1 0 0 0 0 ' <br /> 9 019 M987 <br /> 2/2/1988 <br /> 6/24/1988 <br /> 1/18/1989 ' <br /> 10/12/1989 <br /> 12/13/1990 <br /> ' <br /> 3/13/1991 <br /> 6/17/1991 ' <br /> 3/16/1902 ' <br /> 6/2/1992 n <br /> 9/17/1992 rD <br /> .� <br /> m p, <br /> w 12/15/1992 <br /> m p 'Z 3/9219 993 m <br /> rn --I <br /> � 6/30/1993 r CD� <br /> = 8/31/1993 C <br /> ,ri N <br /> 1 211 611 993 ' <br /> 4/29/1994 <br /> 9/27/1994- <br /> 7/2711995 <br /> 11/16/1995 <br /> 12/30/1996 40 X ' <br /> 8/13/1997 40 X <br /> 8/6/1998 I <br /> 8/10/1999 - 10 W ' <br /> 8/10/2000 <br /> i <br /> 8/6/2001 ' <br /> I <br />