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concentrations to show that treatment of Cement Creek will reduce significant <br /> pollutant concentrations at the mouth of Cement Creek. Since toxicity is most often <br /> demonstrated, and may be defined by the presence of a concentration YJ toxicity <br /> relationship, where an increase in concentration results in an increase in toxicity, it <br /> can be argued that a reduction in pollutant concentrations at the mouth of Cement <br /> Creek is likely to also produce a reduction in toxicity. <br /> However, in order to maintain consistency with other permits, the permit will require <br /> continued WET monitoring and limits until the treatment of Cement Creek begins. <br /> This will be accomplished through the addition of a separate outfall for WET testing. <br /> Terry Tunnel Permit CO-0036056 <br /> 4. Comment: The Terry Tunnel discharge permit should contain a schedule for <br /> termination of the discharge. Emergency discharges and those related to maintenance <br /> should be addressed through standard language contained in the permit. <br /> Response: The Terry Tunnel discharge permit was revised to require elimination of <br /> the discharge by 12/31/96. <br /> 12 <br />