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Concentration[ppb} <br /> 1118189 <br /> 10/12/89 - <br /> 12/13/90 - <br /> 3/13/91 <br /> 0/12/8912/13/903113191 <br /> 6117191 <br /> 3116192 <br /> 612192 <br /> 9117192 <br /> 12/15/92 <br /> 3112193 <br /> 6130/93 <br /> 8131!93 <br /> 12/16/93 <br /> 4129194 <br /> i <br /> 9127194 {} <br /> ] 7/27195 0 CDa <br /> Q 11/16/95 � 3. <br /> m 217196 y <br /> z <br /> m 5121/96 - g <br /> m v 8/28/96 - <br /> m <br /> /2819fi m 12130/96 - <br /> 2/21/97 - <br /> G) <br /> 2!30196 2121/97 Gj 5/9197 <br /> A <br /> 8/13/97 - <br /> 1116/97 - <br /> 2M 3/98 <br /> /13/9711161972113198 <br /> i <br /> 5119198 <br /> 816!98 <br /> 11 15!98 <br /> 2/24/99 <br /> 5111199 <br /> 8110199 <br /> 11!8199 <br /> 2/8/00 <br /> 5/2100 <br /> 8110100 <br /> 11/14/00 <br /> 219/01 <br /> 5!22101 <br /> 816101 <br />