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TrapperlVlining, Inc. WWTF Water Quality Assessment CO-0032115 <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 />Abco'iding to the Classifications and Numeric Standards for Lower Colorado River Basin, stream <br />segment COLCLY03b is Use Protected. Because the receiving waters are designated as Use <br />Protected, no antidegradation review is necessary in accordance with the regulations. Thus, for <br />purposes of this WQA, antidegradation review requirements have been met for the Trapper Mining, <br />Inc. WWTP permit's issuance process. <br />VI. References <br />Colorado Total Maximum Daily Load and Wasteload Allocation Guidance, CDPHE, WQCD, <br />November 1991. <br />Classifications and Numeric Standards for Lower Colorado River Basin, Regulation No. 37, <br />CDPHE, WQCC, Effective January 20. 2004. <br />The Basic Standards and Methodologies for Surface Water, Regulation 31, CDPHE, Effective <br />October 30, 2001. <br />CDPS Summary of Rationale General Permit for Domestic Wastewater Treatment Facilities that <br />Discharge to Receiving Waters with a Chronic Low Flow: Design Flow Ratio of 100:1 or Greater, <br />CDPS Permit COG-584000, Statewide, CDPHE, September 14, 1994. <br />Antidegradation Significance Determination for New or Increased Water Quality Impacts, <br />Procedural Guidance, WQCD, December 2001 and <br />Memorandum Re: First Update to Guidance Version 1.0, WQCD, Apri123, 2002. <br />Appendix A Page 8 of 8 Draft <br />