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Concentration(ppb) <br /> o g <br /> 10/111987 - <br /> 21211988 - <br /> 6/2411988 <br /> 011119872/2/19886/24/1988 <br /> 4/29/1994 - <br /> 7/27/1995 <br /> 2/7/1996 <br /> 8/28/1996 <br /> t7 <br /> 2!21/1997 <br /> oa � <br /> m <br /> m <br /> z 811411997 - <br /> m <br /> 11411997 m C N <br /> m <br /> 2/13/1998 <br /> suW <br /> 8/6/1998 <br /> 2/24/1999 <br /> 8/10/1999 - <br /> 218/2000 <br /> 8/10/2000 <br /> i <br /> 2/9/2001 <br /> 8/6/2001 <br /> 2/8/2002 <br />