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Concentration(ppb) <br /> 1!18!89 <br /> 10/12/89 <br /> 12113190 -- <br /> 3113191 <br /> 6117191 <br /> 3116192 <br /> 612192 <br /> 9117192 <br /> 12115!92 <br /> 3112193 <br /> 6/30/93 -- <br /> M1/93 -- <br /> 12116/93 -- <br /> 4/29/94-- <br /> 9/27/94-- <br /> 2/16/9341291949127194 0 <br /> 7127195 ' n <br /> I G m <br /> 9I 11!16195 <br /> m 2/7/96 <br /> UJ <br /> m _ <br /> Z5!21196 C <br /> 8128196 <br /> m 12/30/96 <br /> CD <br /> Co <br /> 2121197 m <br /> G 5/9/97 - <br /> 8/13197 - <br /> 11/6/97 - <br /> 2113/98 <br /> /9197 8!1319711161972113/98 <br /> 5/19/98 -- <br /> 8/6/98 -- <br /> 11/5198 <br /> /19198816/9611/5198 <br /> 2124199 <br /> 5/11199 <br /> 8/10/99 <br /> 1118!99 <br /> 218100 <br /> 5/2100 <br /> 8110100 <br /> 11/14/00 <br /> 2!9101 <br />