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Concentration(ppb) <br /> C) <br /> 1/18/89 - <br /> 10/12189 -- <br /> 12/13/90 -- <br /> 3/13/91 <br /> 11818910/12/8912/13/903113191 <br /> 6/17/91 <br /> 3116192 it <br /> 0 <br /> X O <br /> 3 <br /> m 6/2/92 <br /> fD <br /> N <br /> M a* <br /> m s <br /> 3 H <br /> d <br /> 9/17192 � <br /> 12/15/92 <br /> m <br /> 3112/93 <br /> 6130193 <br /> 8/31/93 -- <br /> 12116/93 -- <br /> 4/29/94 -- <br /> /31/9312/16/934/29194 <br /> 11/16/95 -- <br /> . <br />