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Concentration (ppb) <br /> O N 0) CD O N A CD Op O N A 0) CO <br /> Nov-97 <br /> Feb-98 <br /> May-98 <br /> Aug-98 <br /> Nov-98 <br /> Feb-99 <br /> May-99 <br /> Aug-99 <br /> Nov-99 <br /> Feb-00 <br /> May-00 W <br /> m m <br /> © Aug-00 o r <br /> n 3 <br /> Nov-00 � <br /> Feb-01 <br /> May-01 <br /> N <br /> Aug-01 —I p <br /> Nov-01 <br /> Feb-02 <br /> May-02 <br /> Aug-02 <br /> Nov-02 = <br /> Feb-03 <br /> May-03 <br /> Aug-03 <br /> m m <br /> i <br />