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<br />' (4) Procedures for Assignino or Changing a Standard or Granting Removing. or Extendin <br />a Temporary Modification <br />' Assigning or changing a standard or granting, removing before its expiration, or <br />extending a temporary modification shall be accomplished by a rule after a rulemaking <br />' hearing. The procedures far taking such action shall be the same as the procedures for <br />assigning or changing classifications. See section 31.6(3)(a)(i). <br />' 31.8 ANTIDEGRADATION <br />(1) Antidegradation Rule <br />' (a) The highest level of water quality protection applies to certain waters that constitute <br />an outstanding state or national resource. These waters, which are those <br />designated outstanding waters pursuant to section 31.8(2)(a), shall be maintained <br />' and protected at their existing quality. <br />(b) An intermediate level of water quality protection applies to waters that have not <br />t been designated outstanding waters or use-protected waters. These waters shall <br />be maintained and protected at their existing quality unless it is determined that <br />allowing lower water quality is necessary to accommodate important economic or <br />' social development in the area in which the waters are located. For these waters, <br />no degradation is allowed unless deemed appropriate following an antidegradation <br />review in accordance with section 31.8(3). Further, all applicable statutory and <br />' regulatory requirements for point sources and, if applicable control regulations <br />have been adopted, all cost-effective and reasonable best management practices <br />for nonpoint sources shall be met. <br />' (c) At a minimum, for all state surface waters existing classified uses and the level of <br />water quality necessary to protect such uses shall be maintained and protected. <br />No further water quality degradation is allowable which would interfere with or <br />t become injurious to these uses. The classified uses shall be deemed protected if <br />' The antidegradation review requirements in section 31.8(3) are not applicable to <br />waters designated use-protected pursuant to section 31.8(2)(b). For these waters, <br />only the protection specified in this subparagraph applies. <br />' (d) Water quality designations and reviewable water provisions shall not be utilized in <br />a manner that is contrary to the provisions of sections 25-8-102 and 25-8-104, <br />C.R.S. <br />' (2) Water Quality-Based Designations <br />Waters which satisfy the criteria in subparagraph (a) below may be designated by the <br />Commission as "outstanding waters". Waters which satisfy the criteria in subparagraph <br />(b) below may be designated "use-protected." Waters not satisfying either set of criteria <br />' will remain undesignated, and will be subject tg the antidegradation review provisions set <br />forth in section 31.8(3), below. <br />1 <br />the narrative and numerical standards are not exceeded <br />16 <br />1 <br />