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Concentration(ppb) <br /> 1118189 0 $ O <br /> 10/12/89 <br /> 12/13/90 - <br /> 3/13/91 <br /> 6/17/91 <br /> 3116192 -- <br /> 612J92 <br /> 9117192 <br /> 12/15/92 <br /> 3/12/93 -- <br /> 6130/93 -- <br /> 8/31/93 -. <br /> /1219361301938/31193 <br /> 12(16/93 - <br /> 4/29/94 -- <br /> 9/27/94 -- <br /> 2/16/934/291949/27/94 0 <br /> 7127/95 <br /> 0 CD <br /> 11!16/95 <br /> m _ <br /> N 2/7/96 -- <br /> m <br /> /7196 m 0 <br /> m p 5/21196 <br /> f° 8/28196 <br /> 12/30/96 <br /> 0 2/21197 -- <br /> 5/9/97 - <br /> 8/13197- <br /> 11/6/97 <br /> /21197 5/9/97 8/1319711/6/97 <br /> 2/13/98 -- <br /> 5/19/98 -- <br /> 816/98 <br /> 113/985119/98816198 <br /> 11/5/98 -- <br /> 2124199 -- <br /> 5/11/99 <br /> 1/5/9821241995111/99 <br /> 8/10/99 <br /> 11/8199 -- <br /> 2/8/00 -. <br /> 1/81992/8100 <br /> 512100 <br /> 8110100 <br /> 11/14/00 <br /> 2!9/01 <br /> N <br />