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Concentration(ppb) <br /> o _ $ <br /> 1/28190 - <br /> 1/28/91/28190 -1/28/91 l <br /> 3/13191 <br /> 6117191 <br /> 3/16/92 -- <br /> 6/2J92 <br /> 9117192 <br /> 12/15/92 <br /> 3112193 <br /> 6/30193 <br /> 8/31/93 <br /> -- <br /> 12/16/93 -- <br /> 4/29/94 <br /> 9127194 <br /> 7/27195 0 <br /> O <br /> 11/16/950 CD <br /> 3 � <br /> O <br /> m 217/96 -- <br /> z <br /> 17/96 ,. <br /> N 5/21/96 -- <br /> z <br /> 121/96 H <br /> = O <br /> O <br /> m 8/28/96 ju3 C <br /> y <br /> 12/30/96 <br /> X 2/21/97 CD <br /> LGIC <br /> 5/9/97 e�b <br /> 8113197 <br /> 00 <br /> 11/6/97 <br /> 2/13198 <br /> 5/19/98 -- <br /> 816198 <br /> 11/5198 <br /> 2124/99 -- <br /> 5/11199 -- <br /> 8/10/99 -- <br /> 11/8199 -- <br /> 218/00 .- <br /> 5/2/00 -- <br /> 8/10/00 -. <br /> 124/995/111998/10/9911/81992/8/005/2/008110/00 <br /> 11114100 - <br /> 2/9/01 <br /> ed <br />