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Concentration(ppb) <br /> 1118/89 <br /> 10/12/89 <br /> i <br /> 12/13/90 <br /> I <br /> 3113191 IE <br /> I <br /> 6117191 <br /> 3116!92 <br /> n <br /> X � <br /> O CD <br /> z 612!92 <br /> N y <br /> m <br /> H •a 9!17192 <br /> m m <br /> x <br /> ON <br /> 12/15/92 <br /> 3/12/93 <br /> 6!30/93 <br /> 8!31!93 <br /> 12!16193 <br /> 4!29/94 <br /> 7/27195 • <br /> i <br /> I <br />