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Concentration(ppb) <br /> 0 0 . <br /> 0 0 0 <br /> 1 11 811 98 9 <br /> 10/1211989 <br /> 12/13/1990 <br /> 3/13/1991 40 <br /> 6/17/1991 <br /> 3/16/1992 <br /> .�� n <br /> O <br /> m 6/2/1992 ^F <br /> m y NR <br /> 2 <br /> z O <br /> m <br /> 3 y <br /> 9/17/1992 X � <br /> m ip — <br /> i � m <br /> a <br /> 12/15/1992 O <br /> 3/12/1993 <br /> 6130/1993 10 W <br /> 8/31/1993 40 <br /> 12116/1993 <br /> 4/29/1994 <br /> 7/27/1995 4 _ 4 • <br />