BC 1999 12 20 - Laserfiche WebLink

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367 restrain Erosion after Completion of Construction or development. Except as provided in Section 8(b) (5), provisions for a Ground Cover sufficient to restrain Erosion must be accomplished within 30 Working Days following Completion of Construction or Development. Prior Plan Approval - No Person shall initiate any Land- Disturbing Activity on a Tract if more than one (1) acre [except as provided in Section 6(a) (2) and (3)] is to be Uncovered unless, thirty or more days prior to initiating the activity, a Plan is filed with and approved by the County. The County shall forward to the North Carolina Director of the Division of Water Quality a copy of each Plan for a Land-Disturbing Activity that involves the utilization of ditches for the purpose of de- watering or lowering the water table of the Tract. Pre-Submittal Conference - At least ten (10) working days prior to Plan submittal for Land-Disturbing Activities involving five (5) acres or more, the Person initiating the Land-Disturbing Activity shall have a pre-submittal conference with the County staff to familiarize them with the proposed Land-Disturbing Activities and proposed mitigation efforts. Zoning Permits - Any Person requesting a zoning permit in association with a Land-Disturbing Activity on a Tract which involves the Uncovering of more than one (1) acre of land [except as provided in Section 6(a)], shall be required to have an approved Plan in accordance with this Ordinance. Subdivision Plats - Any approved preliminary subdivision plan which involves the Uncovering of more than one (1) acre of land [except as provided in Section 6(a)], shall become null and void unless a Plan is submitted and finally approved by the County in accordance with this Ordinance within sixty (60) days following preliminary subdivision plat approval. If such Plan is not approved, preliminary plat approval for said plat shall automatically become null and void. Section 8 - Design and Performance Standards a. Except as provided in Section 8(b) (2), Erosion and Sedimentation control measures, structures, and devices shall be so planned, designed, and constructed as to provide protection from the calculated maximum peak rate of Storm Water Runoff from the Ten Year Storm. Storm Water Runoff rates shall be calculated using the procedures in the USDA, Natural Resources Conservation Service's "National Engineering Field Manual for Conservation Practices," or other acceptable calculation procedures. b. In High Quality Water (HQW) zones, the following design standards shall apply: 1. Uncovered areas in HQW zones shall be limited at any time to a maximum total area within the boundaries of the Tract to twenty (20) acres. Only the portion of the Land- Disturbing Activity within a HQW zone shall be governed by this section. Larger areas may be Uncovered within the boundaries of the Tract with the written approval of the Director. 2. Erosion and Sedimentation control measures, structures, and devices within HQW zones shall be so planned, designed and constructed to provide protection from the Storm Water Runoff of the Twenty-five Year Storm which produces the maximum peak rate of Storm Water Runoff as calculated according to the procedures in the United States Department of Agriculture Soil Conservation Service's National Engineering Field Manual for Conservation Practices or according to procedures adopted by any other agency of this state or the United States or any generally recognized organization or association. 3. Sediment basins within HQW zones shall be designed and constructed such that the basin will have settling efficiency of at least 70 percent for the 40 micron (0.04mm) s{ze soil particle transported into the basin by the Storm Water Runoff of that Two-Year Storm which produces the maximum peak rate of Storm Water Runoff as calculated according to procedures in the United States Department of Agriculture and Natural Resources Soil Conservation Service's National Engineering Field Manual for Conservation Practices or according to procedures adopted by any other agency of this state or the United States or any generally recognized organization or association.