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Concentration{ppb) <br /> o g $ <br /> 1/28/90 - <br /> 1/28M <br /> 128190 1128!91 <br /> 3113191 31 <br /> 6/17191 <br /> 3!16192 <br /> 6/2192 <br /> 9/17/92- <br /> 12115/92- <br /> 3112/93 - <br /> 11719212/15/923112193 <br /> co <br /> m <br /> z 6130/93 <br /> m <br /> ml 8131193 <br /> T 12116!93 <br /> O 4129!94 7 <br /> C <br /> �z 9127!94 0 m <br /> 7127!95 in <br /> m 0 11/16/95 lu t <br /> 7 <br /> fCIJ <br /> w 1O 217/96 �D <br /> m 5/21196 <br /> z <br /> m 8/28196 <br /> 12/30/96 <br /> m <br /> 2121197 <br /> z <br /> III 5/9/97 - <br /> 8/13/97 - <br /> 11/6197 <br /> 19/978/13/971116197 <br /> x <br /> G3 <br /> 2113198 <br /> 5/19/98-- <br /> 8/6/98- <br /> 11/5198- <br /> 2124199 <br /> 5/11/99 <br /> 8/10199 <br /> 1118199 <br /> � u e <br />