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Concentration(ppb) <br /> J <br /> O <br /> 1128/90 - <br /> 1/28/91 <br /> 3113191 <br /> 6117191 <br /> 3116192 <br /> 612/92 <br /> 9117/92 <br /> 12/15/92 <br /> 3/12/93 <br /> 6/30193 <br /> 8131193 <br /> 12/16/93 <br /> 4129/94-- <br /> 9127/94-- <br /> 7/27/95 -- if <br /> 1291949127/94 7127195 n <br /> m 11/16/95 y <br /> z <br /> m 2R/96 <br /> "' f 5/21/96 to <br /> CD <br /> 8/28/96 - <br /> x <br /> 128/96= 12130196 - <br /> 1) � <br /> 2/21/97 ao <br /> 519/97 <br /> 8/13/97 <br /> 1116/97 <br /> 2113/98 <br /> 5119/98 <br /> 8/6/98 <br /> 1115198 <br /> 2124199 <br /> 5/11/99-- <br /> 8110/99 -- <br /> 11/8/99-- <br /> 218100 -- <br /> 512/00 - <br /> 8/10/00 <br /> /11/99811019911/81992/81005121008/10100 <br /> � E► <br />