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Concentration(ppb) 5� <br /> o g <br /> 1!18189 <br /> 10112189 -- <br /> 12/13190 -- <br /> 3/13/91 <br /> 0/12!8912!131903!13191 <br /> 6!17191 <br /> 3!16192 <br /> 612192 <br /> 9/17192 <br /> 12/15/92 <br /> 3/12193 <br /> 6/30193 <br /> 8131193 <br /> 12/16/93 <br /> 4129!94 {1 <br /> I 9127194 <br /> T7/27/95 -- <br /> 7127195 <br /> m �^ = <br /> N 11/16/95 = <br /> m 217!96 . <br /> m 5121/96 � � <br /> 8128!96 <br /> 12/30/96 <br /> 2121/97 - <br /> 5/9/97 - <br /> ail 3197 <br /> 1211975191978!13197 <br /> 11/6/97 -- <br /> 2113198 -- <br /> 5/19198 -- <br /> 11619721131985119198 <br /> 8!6198 <br /> 11/5/98 -- <br /> 2t24199 <br /> 5/11199 -- <br /> M 0/99 <br /> 1111998/10199 <br /> 1118199 <br /> 218100 <br /> 512100 <br /> 8110100 <br />