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Concentration(ppb) ' <br /> o <br /> 0 0 0 <br /> ' <br /> 10!111987 <br /> 2/2/1988 ' <br /> 6/24/1988 ' <br /> 4/29/1994 ' <br /> 7/27/1995 ' <br /> 2/7/1996 ' <br /> n <br /> 8/2811996 - <br /> 0 <br /> 12811996 <br /> m 2/21/1997 N ^� <br /> N <br /> z 3 c <br /> m <br /> N <br /> 0 <br /> 8/1411997 - <br /> a: <br /> !1411997 a: 2/13/1998 <br /> 8/6/1998 <br /> 2/2411999 - <br /> 8110/1999 <br /> !2411999 8/10/1999 ' <br /> 2/8/2000 - <br /> 8/10/2000 - <br /> 21912001 <br /> /8/2000 8110!2000 2/9/2001 X ' <br /> 8/6/2001 ' <br />