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Concentration(ppb) <br /> o <br /> 101111987 - <br /> 2/211988 -- <br /> 6/24/1988 <br /> 0/1/19872!2119886/24/1988 <br /> 4/29/1994 <br /> 7/27/1995 <br /> m <br /> N <br /> m <br /> z <br /> m 2/7/1996 <br /> 0 <br /> c 8/28/1996 0 <br /> m 3 n <br /> z O m <br /> m m <br /> 2/21/1997 N <br /> d . <br /> v 8/14/1997 <br /> P4 <br /> fD <br /> rn 2/13/1998 <br /> I w <br /> 8/6/1998 <br /> m <br /> z <br /> m <br /> ur <br /> 2/24/1999 <br /> LQ <br /> 8/10/1999 <br /> 2/8/2000 <br /> 8/10/2000 <br /> 2/9/2001 <br />