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Concentration(ppb) <br /> 1/18189 - <br /> 10/12189 -- <br /> 12M 3190 <br /> /18/8910/12/8912/13/90 <br /> 3113191 <br /> 6/17/91 <br /> 3/16192 - <br /> 6r2192 <br /> 9/17192-- <br /> 1211 SM <br /> 11719212/15/92 <br /> 3/12193 <br /> 6/30/93 - <br /> 8131/93 - <br /> 12116193 - <br /> /301938131/9312/16/93 Cl) <br /> 4/29/94 O <br /> m <br /> 9/27/94 -- <br /> 0 <br /> z <br /> i 7/27/95 = <br /> w 3 <br /> m � 11/16/95 3 <br /> W <br /> 217!96 <br /> 5/21196 -- <br /> 8/28/96 -- <br /> 12/30M <br /> /21196 8128/9612/30/96 <br /> 2/21/97 -- <br /> 5097 -- <br /> 8/13197 -- <br /> /21/975191978/13/97 <br /> 11/6197 <br /> 2/13198 -- <br /> 5/19198 -- <br /> 8/6/98 -- <br /> 11/5(98 - <br /> /13/985/191988/6/9811/5198 <br /> 2124199 - <br /> 5/11/99 - <br /> 1241995/11/99 <br /> 8/10/99 -- <br /> 11/8199 - <br />