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<br />' (A) are more stringent than is necessary to protect fish life, shellfish life, <br />and wildlife in water body segments which are reasonably capable of <br />' sustaining such fish life, shellfish life, and wildlife from the standpoint of <br />physical, streambed, flow, habitat, climatic and other pertinent <br />characteristics. Where such characteristics are adequate to support the <br />use, use classifications shall be adopted or retained to protect aquatic <br />life which constitutes a significant source of food supply for the fish, <br />shellfish, or wildlife that is the basis for the classified use; or <br />' (B) were adopted based upon material assumptions that were in error or no <br />longer apply. <br />' (iv) As a result of any hearing held pursuant to this section, the Commission may <br />revise or change use classifications, water quality standard(s) or water quality <br />designations in accordance with the criteria contained in the Act or whenever <br />' necessary to insure compliance with the other provisions of this regulation. <br />(v) Where the Commission determines that an inconsistency exists, it shall <br />' declare the inconsistent classification, standards or designations void ab initio <br />and shall simultaneously establish appropriate classifications, standards or <br />designations. <br />' (4) Segmentation <br />(a) For purposes of adopting site-specific classifications and water quality standards, <br />' the streams and other surface water bodies shall be identified according to river <br />basin and/or subbasin and specific water segments. <br />' (b) Segments may constitute a specified stretch of a river mainstem, a specific <br />tributary, a specific lake or reservoir, or a generally defined grouping of waters <br />within the basin (e.g., a specific mainstem segment and all tributaries flowing into <br />' that mainstem segment. <br />(c) Segments shall generally be delineated according to the points at which the use, <br />' physical characteristics or water quality characteristics of a watercourse are <br />determined to change significantly enough to require a change in use <br />classifications and/or water quality standards. In many cases, such transition <br />' points can be specifically identified from available water quality data. In other <br />cases, however, the delineation of segments shall be based upon best judgments <br />of where instream changes in uses, physical characteristics or water quality occur, <br />based upon upstream and downstream data. <br /> <br /> <br /> <br /> y <br /> <br />