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Concentration(ppb) <br /> 'o $ <br /> o a o o <br /> 10/1187 <br /> 212188 <br /> 6/24/88 -- <br /> 4/29/94 -- <br /> 7/27/95 <br /> /24/884/29/947/27/95 <br /> 2/7/96 0 <br /> m <br /> N 8/28196 = p <br /> m m <br /> 2/21/97 -- <br /> w <br /> 8/14/97 <br /> 2113198 <br /> 8/6/98 <br /> I <br /> 2124/99 <br /> 8/10/99 -- <br /> 2/8/00 - <br /> • <br />