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r' ~'~ <br />CARLTON TUNNEL DISCHARGE <br />ZINC VARIABILITY OVERTIME <br />2 <br />1.5 <br />e <br />z <br />0 <br />w <br />U <br />z <br />0 <br />U <br />• 0.5 <br />0 <br />Nov-73 Dec-76 Dec-81 Sep-84 Sep-86 Sep-88 Sep-90 Sep-92 <br />Oct-75 Dec-80 Sep-83 Sep-85 Sep-87 Sep-89 Sep-91 <br />DATE <br />® Zinc _ Discharge Limit for ZZnc <br />