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13 <br /> Such surface shall include any paved or unpaved <br /> area comprised of asphalt, concrete, crushed <br /> stone, compacted stone, or other similar <br /> material. Rooftops, streets, driveways, <br /> sidewalks, plazas, garages, loading areas, and <br /> exterior storage areas are examples of <br /> impervious surface. <br /> Maximum impervious surface in each ED district <br /> is limited to the percentages listed below: <br /> Buckhorn Road Interchange 70% total lot area <br /> with detention ponds required at 12% and over <br /> I-40/Old 86 Interchange not applicable <br /> East Orange 70% total lot area <br /> with detention ponds required at 24% and over <br /> NC Highway 54-West not applicable <br /> 5. Stormwater Management - In all ED Districts <br /> within a designated water supply watershed, the <br /> first half-inch of stormwater runoff from <br /> impervious surface shall be controlled. This <br /> may be accomplished by: <br /> a. Preserving undisturbed vegetated areas for <br /> on-site infiltration of runoff, <br /> b. Installing grassed swales, trenches, or <br /> retention ponds to increase infiltration <br /> capacity, and/or <br /> c. Using detention structures to reduce the <br /> rate of runoff leaving the site. <br /> Detention or retention ponds may be required at <br /> the Buckhorn Road Interchange and East Orange <br /> ED Districts, depending on the amount of <br /> impervious surface proposed. Article 6 of the <br /> Zoning Ordinance contains specific requirements <br /> for stormwater management in Protected <br /> Watersheds. <br /> Wherever engineered structural methods are <br /> proposed, the applicant must submit design <br /> calculations and construction details for <br /> review with the site plan or Planned <br /> Development. In addition, long-term maintenance <br /> must be assured. <br /> Additional criteria which apply to stormwater <br /> management: <br />