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Concentration(ppb) <br /> 1/18189 - <br /> 12/13190 -- <br /> 3113191/18/8612/13/903113191 <br /> 6117191 <br /> 3116192 <br /> 612/92 <br /> 9/17192 <br /> 12/15/92 <br /> -- <br /> 3/12/93 -- <br /> 6/30/93 -- <br /> 8131/93 -- <br /> 4/29/94 -- <br /> 9127194-- <br /> 7/27/95 - <br /> /12/936130/938131/93 4/291949127194 7127/95 x 0 <br /> Z 2/7/96 3 y • <br /> e9 <br /> m 5/21196 -- <br /> CD�r <br /> 8128196 3 <br /> eo � <br /> to <br /> s 12/30/96 <br /> G7 <br /> 2/21/97 <br /> 5/9197 <br /> 8/14/97 <br /> 1116197 <br /> 2113198 <br /> 5/19198 <br /> 8/6198 <br /> I <br /> 11/5198 <br /> 2124199 <br /> 5/11/99 <br /> 8/11199 <br /> 1119199 <br /> 218100 • <br />