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2) Berms, fences and landscaping walls may be used with plant <br />materials for screening, provided such features are designed <br />and located in harmony with other site features and functions; <br />3) To minimize visual impact by blending architecture into the <br />surrounding landscape, foundation plantings are required at all <br />freestanding entrance signs; <br />4) Use of xeriscaping principles. <br />e) Stormwater Management <br />1) No net increase in peak flow leaving the site from the <br />predevelopment conditions for the 10 year, 24-hour storm; <br />2) The stormwater management system must respect existing. <br />drainage patterns. Runoff shall be .directed away from erosion- <br />prone slopes. <br />3) Energy dissipaters shall be used where runoff is concentrated <br />and discharged, for example, at downspouts from rooftops and <br />storm drains at parking areas. Runoff shall not be discharged <br />directly into surface water, or other environmentally sensitive <br />areas; <br />4) Concentrated stormwater, conveyed by ditches, channels, <br />pipes, swales or other conveyance systems must be dispersed <br />and diffuse flow reestablished prior to discharge into a stream <br />buffer; <br />5) Nitrogen load contribution must be held to 3.6 Ibs per acre per <br />year. <br />f) Drainage <br />1) All drainage structures will be installed and maintained <br />according to the approved Stormwater Management Plan. <br />2) School projects that include retention/detention ponds shall <br />comply with the requirements in Section 6.23.4, Operation and <br />Maintenance of Structural Best Management Practices. <br />g) Grading and Erosion Control <br />1) Plans for grading and erosion control shall comply with <br />standards contained in the Orange County Erosion and <br />Sediment Control Ordinance and Manual and, if applicable, <br />The North Carolina Erosion and Sedimentation Control <br />Program rules; <br />2) Construction shall be phased to minimize disturbance and <br />sedimentation; <br />8-49 <br />