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Park District Planned Development Overlay | Exhibit A.2 – Park District Design Standards Page 20 <br />Exhibit A.2_Park District PDO_Design Standards_24-0703 <br />2. Planting. A minimum of 60 percent of planting areas (excluding lawn) must be planted <br />with native plants or verified non-invasive, low-maintenance, and ecologically beneficial <br />plants. <br />3. A minimum of 30 native understory plant species must be planted throughout the site. <br />See Section 2.0 for streetscape standards. <br />C. Canopy coverage. Plan for at least 20 percent tree canopy coverage at the time of tree <br />maturity. Areas covered by building footprints and vehicular paving are not included in <br />coverage calculations. Open spaces on top of parking podiums, however, are included. <br />Strategies must include: <br />1. Preserve existing, healthy mature trees when feasible. <br />2. Grow large deciduous and conifer trees by selecting appropriate species and providing <br />adequate space for the trees to mature and be maintained. <br />D. Planting and irrigation. <br />1. No invasive or noxious species may be knowingly planted on the site and must be <br />removed where found. <br />2. Large trees must be irrigated for five years after planting to ensure survival through <br />increasingly hot, dry, and long summers. <br />E. Fences and walls. <br />1. Materials. Chain link fences are prohibited in the interior of the site. Coated chain link <br />fencing with a dark color such as black, dark gray, or dark green may be used only along <br />boundary conditions at the eastern and western edges of the Park District, but must be <br />used in association with boundary plantings required in (A) above. <br />2. Retaining walls. Retaining walls taller than six feet and visible from a street shall employ <br />design measures to mitigate the visual impact of the wall. Such measures may include <br />treatment such as planting, integral patterns, additive design elements, and the like and <br />must extend to include 50 percent of the wall. <br />F. Foundation screening. All street-facing elevations must have landscaping along any <br />exposed foundation. <br />