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�1RTICLE IV. DISTRICT REGULATIONS Page 8 of 15 1. All open areas of a lot which are not used or improved for required parking areas, drives, trails or storage shall be landscaped with a combination of deciduous and coniferous species, including overstory trees, understory trees, shrubs, flowers and groundcover materials. The plan for landscaping shall include ground cover, bushes, shrubbery, trees, sculpture, foundations, decorative walks or other similar site design features or materials in a quantity having a minimum value in conformance with the following table: TABLE INSET: Minimum Tree and Shrub Requirements Vegetation Size Quantity Type Overstory 2.5-inch bb One tree per 1,000 gross square feet of building footprint deciduous (Caliper) area or one tree per 40 lineal feet of site perimeter, trees whichever is greater. Coniferous 6-foot height Minimum of 30 percent of required overstory trees must trees bb be coniferous Understory 3-gal. potted One shrub per 300 gross square feet of building footprint shrubs or 18-inch area or one shrub per 30 lineal feet of site perimeter, whichever is greater. Ornamental Not required; but finro ornamental deciduous trees may deciduous 1.5-inch bb be substituted for one required overstory deciduous tree trees (Caliper) (maximum substitution equals 25 percent of required overstory deciduous trees) Credits for existing trees: The city council shall have sole discretion whether credit shall be granted for existing healthy trees In instances where healthy plant materials of acceptable species exist on a site prior to its development, the application of the standards in subsection (14)b of this section may be adjusted by the city to allow credit for such material, provided that such adjustment is consistent with the intent of this division. 2. A reasonable attempt shall be made to preserve as many existing trees as is practicable and to incorporate them into the site plan. 3. All new overstory trees shall be balled and burlapped or moved from the growing site by tree spade. Deciduous trees shall have a minimum caliper of 2 1/2 inches. Coniferous trees shall be a minimum of six feet in height. Ornamental trees shall have a minimum caliper of 1 1/2 inches. 4. All site areas not covered by buildings, sidewalks, parking lots, driveways, trails, patios, or similar hardsurface materials shall be covered with sod or an equivalent ground cover approved by the city. This requirement shall not apply to site areas retained in a natural state. 5. In order to provide for adequate maintenance of landscaped areas, an underground sprinkler system shall be provided as part of each new development, except one- and two-family dwellings and additions to existing structures which do not at least equal the floor area of the existing structure. A sprinkler system shall be provided for all landscaped areas, except areas to be preserved in a natural state. 6. Not more than 50 percent of the required number of trees shall be http://library3.municode.com/default/DocView/13094/1/109/113 6/24/2008