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Article 6: Development Standq" <br /> Section 6.15:Soil Erosion and Sedimentation Control268F <br /> (3) Every effort shall be made to maintain buffer zones consisting of existing <br /> vegetation between the Land-Disturbing Activity and the <br /> watercourse. <br /> (G) Additional Standards for Economic Development Districts <br /> The following additional standards shall apply within the Economic Development Districts: <br /> (1) Lot grading must be done in such a way as to preserve the topographic features <br /> and maintain natural drainage patterns, and to provide positive drainage. In <br /> locating buildings, parking, and other features on the site, the following standards <br /> must be met: <br /> (a) Minimize disturbance and phase development wherever practical. <br /> (b) Preserve existing vegetation, especially significant stands of trees along <br /> drainageways, on steep slopes, and in buffer areas. <br /> (c) Use the natural shape of the land with minimal grading to locate features <br /> in a way that minimized impacts on and off the site. <br /> (2) All site grading must be designed to meet the standards shown on the following <br /> table: <br /> SLOPE . STANDARDS <br /> SITE AREA MINIMUM SLOPE MAXIMUM .- <br /> Planting Areas 2% 3:1 <br /> Parking Lot Pavement 2% 4% <br /> Driveways and Access Drives 2% 5% <br /> Pedestrian Plaza Areas 1% 2% <br /> Sidewalks 1% 8% <br /> (3) No cut or fill slopes of any type may be steeper than 3:1 and must have smooth <br /> vertical transitions. Where space limitations demand, terracing with approved <br /> retaining walls will be utilized. Where retaining walls are used, they must be <br /> constructed of a material compatible with the building architecture. <br /> (4) Berms, channels, swales, etc. must be graded in such a way as to be an integral <br /> part of the landscape, and paved surfaces must be designed with smooth vertical <br /> transitions between changes in slope. <br /> (5) In order to minimize soil erosion, practical combinations of the following shall be <br /> used: <br /> (a) Expose the smallest practical area of cleared land during construction. <br /> (b) Temporary ditches, dikes, vegetation, and/or mulching must be used to <br /> protect critical areas exposed during development or construction. <br /> (c) Sediment control measures must be installed and maintained to remove <br /> sediment from rja-offstormwater runoff watsrs during development. <br /> (d) Permanent landscaping and groundcover must be installed as soon as <br /> practical after construction activities are completed. <br /> (e) Temporary groundcover must be used for fill material subject to erosion <br /> and on construction projects over six months duration. <br /> 6.15.8 Stormwater Outlet Protection <br /> (A) Control of Discharge in University Lake, Cane Creek, and Upper Eno Watersheds <br /> Orange County, North Carolina— Unified Development Ordinance Page 6-133 <br />