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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 3. Permit No. CO-0027154 <br />Once the chronic lethality limitation becomes effective, only exceedance of the <br />limitation specified in Part I.A. 2. will trigger the requirement for conducting <br />the automatic compliance schedule identified in Part I.B. of the permit. Prior <br />to and after the limitation becomes effective, if the toxicity is due to <br />differences in the growth of the fathead minnows or the reproduction of the <br />Ceriodaphnia, no immediate action on the part of the permittee will be required. <br />However, this incident, along with other WET data, will be evaluated by the <br />Division and may form the basis for reopening the permit and including additional <br />WET limits or other requirements. <br />d) General Information: The permittee should read the WET testing sections of Part <br />I.A. and I.B. of the permit carefully. The permit outlines the test requirements <br />and the required follow-up actions the permittee must take to resolve a toxicity <br />incident. The permittee should read, along with the documents listed in Part I.B <br />of the permit, the Colorado Water Ouality Control Division Biomonitorine Guidance <br />Document, dated July 1, 1993. This document outlines the criteria used by the <br />Division in such areas as granting relief from WET testing, modifying test <br />methods and changing test species. The permittee should be aware that some of <br />the conditions outlined above may be subject to change if the facility <br />experiences a change in discharge, as outlined in Part II.A.1 of the permit. <br />Such changes shall be reported to the Division immediately. <br />IV. PERMIT PAGES AFFECTED BY AMENDMENT: <br />As a result of this amendment, pages la - le, lg, lj, and 1Y - lp are amended. <br />Jon C. Kubic <br />April 25, 1994 <br />