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Concentration(ppb) <br /> o <br /> 1/18/89 - <br /> 10/12189 -- <br /> 12(13/90 -- <br /> 3113M <br /> 11818910/12/8912/13/903113191 <br /> 6117191 <br /> 3116192 <br /> 612192 <br /> 9117192 <br /> 17/15/92 <br /> 3112193 <br /> 6130/93 <br /> 8/31/903 <br /> 12/16/93 <br /> 0 <br /> 4/29/94 on <br /> o � <br /> 9/27194 <br /> w <br /> N 7127195-- N O <br /> m � 11/16/95 � N <br /> 217196 <br /> 5/21196 im <br /> i <br /> 8128196 C <br /> 12130/96 - <br /> 2/21/97 - <br /> 5/9/97 - <br /> 8/13197- <br /> 11/6/97- <br /> 2/13M <br /> 2/30/962121197519/9781131971116/972113198 <br /> 5119/98 -- <br /> 8/6/98 -- <br /> 11/5/98 -- <br /> 2/24199-- <br /> 5/11/99-- <br /> 8110/99-- <br /> 1118M <br /> 1191988/6/9611151982/241995/11/9981101991118199 <br /> 218100 , <br />