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as provided in Section 6(a)],shall be required to have an <br />approved sedimentation and erosion control plan in accordance <br />with this Ordinance. <br /> <br />go <br /> <br />Subdivision Plats - any approved preliminary subdivision plat <br />which involves the uncovering of more than one (1) acre of land <br />[except as provided in Section 6(a)], shall become null and void <br />unless a sedimentation and erosion control plan is submitted <br />and approved in accordance with this Ordinance within sixty <br />(60) days following preliminary subdivision plat approval. If <br />such plan is not approved, preliminary plat approval for said <br />plat shall automatically become null and void. <br /> <br />Section 8 Design and Perfo.~iance Standards <br /> <br />Except as provided in Section 8(b)(2), erosion and sedimentation <br />control measures, structures, and devices shall be so planned, <br />designed, and constructed as to provide protection from the <br />calculated maximum peak rate of runoff from the 10-year storm. <br />Runoff rates shall be calculated using the procedures in the USDA, <br />Natural Resources Conservation Service's "National Engineering <br />Field Manual for Conservation Practices", or other acceptable <br />calculation procedures. <br /> <br />bo <br /> <br />In High Quality Water (HQW) zones the following design <br />standards shall apply: <br /> <br />Uncovered areas in HQW zones shall be limited at any time <br />to a maximum total area within the boundaries of the tract <br />to twenty (20) acres. Only the portion of the land-disturbing <br />activity within a HQW zone shall be governed by this <br />section. Larger areas may be uncovered within the <br />boundaries of the tract with the written approval of the <br />Director. <br /> <br />Erosion and sedimentation control measures, structures, and <br />devices within HQW zones shall be so planned, designed <br />and constructed to provide protection from the runoff of the <br />25-year storm which produces the maximum peak rate of <br />runoff as calculated according to the procedures in the <br />United States Department of Agriculture Soil Conservation <br />Service's National Engineering Field Manual for <br />Conservation Practices or according to procedures adopted <br /> <br />10 <br /> <br /> <br />