ORD-2007-017 - Sedimentation and Erosion Control Ordinance

Browse Search

Orange County SE & SC Ordinance Se~ter+~ber-16~A83Seotember 12, 20b6 adjacent to designated trout waters shall be limited to a maximum of 10% of the total length of the buffer zone within the tract to be distributed such that there is not more than 1001inear feet of disturbance in each 10001inear feet of buffer zone. Larger areas may be disturbed with the written approval of the Director of the Division of Land Resources of the Department of Environment, Health, and Natural Resources. 4. No land-disturbing activity shall be undertaken within a buffer zone adjacent to designated trout waters that will cause adverse temperature fluctuations, as set forth in 15 NCAC 2B.0211 Fresh Surface Water Classification and Standards, in these waters. B. Graded Slopes and >;Ylls The angle for graded slopes and fills shall be no greater than the angle which can be retained by vegetative cover or other adequate erosion control devices or structures. In any event,,slopes left exposed will; within'~O~~r~:=s 21 calendar days of completion of any phase of grading, be planted or otherwise provided with ground cover, devices, or structures sufficient to restrain erosion. C. Ground Cover Whenever land-disturbing activity is undertaken on a tract comprising more than 20,000 square feet, if more than 20,000 square feet are uncovered, the person conducting the land-disturbing activity shall install such sedimentation and erosion control devices and practices as are sufficient to retain the sediment generated by the land-disturbing activity within the boundaries of the tract during construction upon and development of said tract, and shall plant or otherwise provide a permanent ground cover sufficient to restrain erosion after completion of construction or development. Except as provided in Section 8 (D) (2) (e) of this ordinance, provisions for a ground cover sufficient to restrain erosion must be accomplished within 3015 working days or x-28 90 calendar days, whichever period is shorter, following completion of construction or development. D. Design and Performance of Control Measures 1. Design Storm Except as provided in Section 8(D)(2)(b) of this Ordinance and in the standard for sediment ponds in the Soil Erosion and Sediment Control Manual erosion and sedimentation control measures, structures, and devices shall be so planned, designed, and constructed as to provide protection from accelerated erosion and sedimentation from the calculated maximum peak rates of runoff from the ten- year frequency storm. Runoff rates shall be calculated using the procedures in the USDA Soil Conservation Service's "National Engineering Field Manual for Conservation Practices," or other calculation procedures acceptable to the Erosion Control Officer. 14