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Cotter Corporation Water Quality Assessment <br />V. Antidegradation Review <br />CO-0036251 <br />As set out in The Basic Standards and Methodologies of Surface Water, Section 31.8(2)(b), an <br />antidegradation analysis is required except in cases where the receiving water is designated as "Use <br />Protected." Note that "Use Protected" waters aze waters "that the Commission has determined do <br />not warrant the special protection provided by the outstanding waters designation or the <br />antidegradation review process" as set out in Section 31.8(2)(b). The antidegradation section of the <br />regulation became effective in December 2000, and therefore antidegradation considerations are <br />applicable to this WQA development. <br />According to the Classification and Numeric Standards for Gunnison and Lower Dolores River <br />Basins, the immediate receiving stream, stream segment COGULD03, is Use Protected. Because the <br />receiving waters are designated as Use Protected, no antidegradation review is necessary in <br />accordance with the regulations. Thus, for purposes of this WQA analysis, antidegradation review <br />requirements have been met for the Cotter Corporation permit issuance process. <br />VI. References <br />Colorado Total Maximum Daily Load and Wnsteload Allocation Guidance, CDPHE, WQCD, <br />November 1991. <br />Classification and Numeric Standards for Gunnison and Lower Dolores River Basins, Regulation <br />No. 35, CDPHE, WQCC, December 14, 1998. <br />The Basic Standards and Methodologies for Surface Water, Regulation 31, CDPHE, November 8, <br />2000. <br />Appendix A Page 13 of 13 Final <br />