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52 <br /> Corporation, and sewer service is available through extension <br /> of the Efland sewer system owned by Orange County. <br /> Because the district is bordered or bisected by so many <br /> transportation and utility systems, the entire district has been <br /> designated as a Primary Development Area. <br /> The district is characterized by gently rolling topography with <br /> few building constraints. However, soils unsuited for <br /> development are found along intermittent streams which flow <br /> south beneath 1-85/1-40 to join Sevenmile Creek, a tributary <br /> of the Eno River. Because of its location on the western edge <br /> of the Upper Eno River Watershed, land uses in the district <br /> are subject to watershed protection standards governing <br /> impervious surface and the control of stormwater. <br /> The total amount of impervious surface covered by buildings <br /> and parking lots is limited to 70 percent of a building site. As <br /> shown on the schematic plan, stormwater control for multiple <br /> sites may be provided through construction of required <br /> wetwater detention basins along streams draining the district. <br /> Impervious surface limits and standards for detention basin <br /> construction and maintenance are discussed further in section <br /> 2.3 - Land Use Intensity and Appendix C- Wet Detention <br /> Basin Standards, respectively. While detention basins may be <br /> constructed on individual sites, those shown on the schematic <br /> plan provide a district amenity and enable uses to be <br /> "clustered" into distinct compartments. <br /> Economic Development Distracts Design Manual Page 2.1.4 <br />