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Concentration (ppb) <br /> a j N N N N W W W W A A A jh� Cn Cn Ch <br /> N Ch ,7 C] N Ul 4 Ch -J O N Un -4 O N (n <br /> �, 0 0 o i� o cn 0 � o cn o is, o in o tri a in o in 0 <br /> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 <br /> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Cl 0 0 0 0 0 0 0 <br /> Nov-97 <br /> Feb-98 t T <br /> i <br /> May-98 <br /> I <br /> Aug-98 - - - - --�--f— <br /> I � <br /> Nov-98 t - <br /> I �I l <br /> Feb-99 - -+ -- <br /> May-99 May-99 - <br /> I <br /> Aug-99 ,•" - t -- - I I <br /> Nov-99 <br /> Feb-00 - + • + � � - �- --�-- - , <br /> I I I F I 3 <br /> May-00 <br /> Aug-00 - rt - - _! -- m <br /> '' m <br /> Nov-00 �- <br /> C- <br /> May-01 - } {- _,_.. �_+ _ N <br /> Au 01 - - .. - *-- - — ---- m m <br /> g - ; - - r <br /> Nov-01 n I ; t p <br /> Feb-02 = <br /> --- I I W <br /> May-02 <br /> Aug-02 <br /> Nov-02 - - - -+--} y- - - --- -- - <br /> Feb-03 - <br /> +- . f t ..�-- I I C <br /> -- - I --- y <br /> I <br /> I <br /> May-03 - <br /> ' I <br /> Aug-03 <br /> Nov-03 <br /> May-04 - <br /> � - <br /> Aug-04 � -- , . ,I t <br /> Nov-04 <br /> s• i I i <br /> Feb-05 - 4- 1t— <br /> i <br /> May-05 <br /> I <br /> i <br /> (D <br /> N CO <br /> I(D M <br /> (_CD _-_ <br />