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Concentration(ppb) <br /> Q _ <br /> 1011187 ~ � o <br /> 212/88 <br /> 6124188 <br /> 1/18189 <br /> 10/12/89 <br /> 3/13/91 <br /> 3/16/92 -- <br /> 6/2/92 -- <br /> 12115/92 -- <br /> 3/12/93 <br /> 1161926/2/9212/15/923112/93 <br /> -- <br /> 6/30/93 -- <br /> 8131/93 -. <br /> /301938131/93 <br /> 12/16/93 <br /> 4/29194-- <br /> 9/27/94 -- n <br /> 7/27/95 -- <br /> Z7196 <br /> /27195 217/96 <br /> O <br /> nZi 5/21196 3 <br /> m 3 N <br /> m m 8/28/96 3 <br /> M <br /> 12/30/96 � § <br /> i <br /> 2121197 m <br /> 519/97 + <br /> 8/14/97 -- <br /> 11/6/97 -. <br /> 2113/98 <br /> 5119198 <br /> 8/6/98 <br /> 1115/98 <br /> 2124/99 -- <br /> 5/11 Mss <br /> 8/10196 <br /> 1118/99 <br /> 2/8/00 <br /> 5/2100 -- <br /> 8110/00 -- <br /> 11/14100 -. <br /> 12100811010011/14/00 <br /> 2/9/01 • <br />