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go <br /> <br />Subdivision Plats - Any approved preliminary subdivision plan which <br />involves the Uncovering of more than one (1) acre of land [except as <br />provided in Section 6(a)], shall become null and void unless a Plan is <br />submitted and finally approved by the County in accordance with this <br />Ordinance within sixty (60) days following preliminary subdivision plat <br />approval. If such Plan is not approved, preliminary plat approval for said <br />plat shall automatically become null and void. <br /> <br />Section 8 - Design and Performance Standards <br /> <br />ao <br /> <br />Except as provided in Section 8(b)(2), Erosion and Sedimentation control <br />measures, structures, and devices shall be so planned, designed, and <br />constructed as to provide protection from the calculated maximum peak <br />rate of Storm Water Runoff from the Ten Year Storm. Storm Water <br />Runoff rates shall be calculated using the procedures in the USDA, <br />Natural Resources Conservation Service's "National Engineering Field <br />Manual for Conservation Practices," or other acceptable calculation <br />procedures. <br /> <br />In High Quality Water (HQW) zones, the following design standards shall <br />apply: <br /> <br />Uncovered areas in HQW zones shall be limited at any time to a <br />maximum total area within the boundaries of the Tract to twenty <br />(20) acres. Only the portion of the Land-Disturbing Activity <br />within a HQW zone shall be governed by this section. Larger <br />areas may be Uncovered within the boundaries of the Tract with <br />the written approval of the Director. <br /> <br />Erosion and Sedimentation control measures, structures, and <br />devices within HQW zones shall be so planned, designed and <br />constructed to provide protection from the Storm Water Runoff of <br />the Twenty-five Year Storm which produces the maximum peak <br />rate of Storm Water Runoff as calculated according to the <br />procedures in the United States Department of Agriculture Soil <br />Conservation Service's National Engineering Field Manual for <br />Conservation Practices or according to procedures adopted by any <br />other agency of this state or the United States or any generally <br />recognized organization or association. <br /> <br />Sediment basins within HQW zones shall be designed and <br />constructed such that the basin will have settling efficiency of at <br /> <br />10 <br /> <br /> <br />