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15 <br />include land-disturbing activity along trout waters when the duration of <br />said disturbance would be temporary and the extent of said disturbance <br />would be minimal. This subdivision shall not apply to aland-disturbing <br />activity in connection with the construction of facilities to be located on, <br />over, or under a lake or natural watercourse. <br />Unless otherwise provided, the width of a buffer zone is measured from <br />the edge of the water to the nearest edge of the disturbed area, with the <br />25 percent of the strip nearer the land- disturbing activity containing the <br />natural or artificial means of confining visible siltation. <br />2. The 25 foot minimum width for an undisturbed buffer zone adjacent to <br />designated trout waters shall be measured horizontally from the top of the <br />bank. <br />3. Where a temporary and minimal disturbance is permitted as an exception <br />by Section 8 (A) (1) of this ordinance, land-disturbing activities in the <br />buffer zone adjacent to designated trout waters shall be limited to a <br />maximum of 10% of the total length of the buffer zone within the tract to be <br />distributed such that there is not more than 100 linear feet of disturbance <br />in each 1000 linear feet of buffer zone. Larger areas may be disturbed <br />with the written approval of the Director of the Division of Land Resources <br />of the Department of Environment, Health, and Natural Resources. <br />4. No land-disturbing activity shall be undertaken within a buffer zone <br />adjacent to designated trout waters that will cause adverse temperature <br />fluctuations, as set forth in 15 NCAC 2B.0211 Fresh Surface Water <br />Classification and Standards, in these waters. <br />B. Graded Slopes and Fills <br />The angle for graded slopes and fills shall be no greater than the angle <br />which can be retained by vegetative cover or other adequate erosion <br />control devices or structures. In any event, slopes left exposed will, within <br />30 working days of completion of any phase of grading, be planted or <br />otherwise provided with ground cover, devices, or structures sufficient to <br />restrain erosion. <br />C. Ground Cover <br />Whenever land-disturbing activity is undertaken on a tract comprising <br />more than 20,000 square~feet, if more than 20,000 square feet are <br />uncovered, the person conducting the land-disturbing activity shall install <br />such sedimentation and erosion control devices and practices as are <br />sufficient to retain the sediment generated by the land-disturbing activity <br />within the boundaries of the tract during construction upon and <br />development of said tract, and shall plant or otherwise provide a <br />permanent ground cover sufficient to restrain erosion after completion of <br />