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Concentration(ppb) <br /> 1 <br /> -� <br /> o Q <br /> 1118189 <br /> 12/13/90 <br /> 3113191 <br /> 6117/91 <br /> 3/16/92-- <br /> 6/2192 -- <br /> 9/17/92 - <br /> 12115/92 - <br /> 3/12193 - <br /> 6/30/93-- <br /> 0 <br /> 116192612192911719212!15!923/121936130193n <br /> 8/31193 ' n <br /> 4!29/94 0 m <br /> co <br /> 9/27/94 y .�+ <br /> = O <br /> m 7127/95 c <br /> N <br /> m 217196 <br /> 50/96 - <br /> 8/28/96 - ccn <br /> 12130/96 - <br /> 20/97 <br /> 2/30/962121/97 <br /> 519197 <br /> 8114/97 <br /> 1116/97 <br /> 2113198 <br /> 5119/98 <br /> 816198-- <br /> 11/5/98 -- <br /> 2r24/99 <br /> 1619811/5/982124/99 <br /> 5111/99 -- <br /> 8/11/99 -- <br /> 11/9/99 <br /> 111/99811119911/9/99 , <br /> � i 11 <br />