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Concentration(ppb) <br /> a � g <br /> 1118/89 - <br /> 10/12189 -- <br /> 12/13/90 -- <br /> 3113/91 <br /> 116!89 -10/12/8912/13/903113191 <br /> 6117191 <br /> 3116192 <br /> n <br /> A � 3 <br /> °J 6/2/92 -- <br /> z <br /> N .�► <br /> m O <br /> m � C <br /> 9!17192 <br /> 3 <br /> � � m <br />� 12/15/92 <br /> 3112/93 - <br /> 6/30193 -- <br /> 8/31/93 -- <br /> 11219361301938!31193 <br /> 12116/93 -- <br /> 4/29/94-- <br /> 11/16/95 <br /> I <br /> n � 1� <br />