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i <br /> Concentration(ppb) <br /> C) <br /> 1/18/89 - <br /> 10112/89 -- <br /> 12113/90 -- <br /> 3/13/91/18/8910/12/8912/13/903/13191 <br /> 6/17191 <br /> 3/16/92 <br /> 6/2192 <br /> 9/17192 <br /> 12/15/92 <br /> 3112193 <br /> 6130/93 <br /> 8131/93 <br /> 12/16/93 <br /> 4/29194 0 <br /> 9/27194 0 0 <br /> m 7/27195 N <br /> IN <br /> 11/16/95 <br /> m a <br /> 2/7196 -- <br /> 5/21/96 -- <br /> 8/28196 <br /> /71965121196 8128196 <br /> 12/30/96 -- <br /> 2121197 <br /> 2/30/96 2121197 <br /> 5/9/97 <br /> 8/13/97 <br /> 1116/97 <br /> 2113/98 <br /> 5119/98 <br /> 816198 <br /> 1115198 <br /> 2/24199 <br /> 5/11199 <br /> 8110/99 <br /> 11/8199 <br /> 2/8100 <br /> 5!2/00 <br />