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ZONING ORDINANCE <br /> SECTION 300.27 <br /> PAGE 221 <br /> adjusted by the city to allow credit for such material, <br /> provided that such adjustment is consistent with the intent of <br /> this ordinance. The city may permit the seeding of areas <br /> reserved for future expansion of the development if consistent <br /> with the intent of this ordinance. <br /> • <br /> b) A reasonable attempt shall be made to preserve as many <br /> existing trees as is practicable and to incorporate them into <br /> the site plan. _ <br /> c) All new overstory trees shall be balled and burlapped or moved <br /> from the growing site by tree spade. Deciduous trees shall <br /> have a minimum caliper of 2 1/2 inches. Coniferous trees <br /> shall be a minimum of six feet in height. Ornamental trees <br /> shall have a minimum caliper of 1 1/2 inches. <br /> d) All site areas not covered by buildings, sidewalks, parking <br /> lots, driveways, patios . or similar hard surface materials <br /> shall be covered with sod or an equivalent ground cover <br /> approved by the city. This requirement shall not apply to <br /> site areas retained in a natural state. <br /> e) In order to provide for adequate maintenance of landscaped <br /> areas, an underground sprinkler system shall be provided as <br /> part of each new development, except one and two-family <br /> dwellings and additions to existing structures which do not at <br /> least equal the floor area of the existing structure. A <br /> sprinkler system shall be provided for all landscaped areas <br /> except areas to be preserved in a natural state. <br /> f) Not more than 50 percent of the required number of trees shall <br /> be composed of one species. No required tree shall be any of <br /> the following: <br /> 1) a species of the genus Ulmus (elm) , except those elms <br /> bred to be immune to Dutch Elm disease; <br /> 2) box elder; <br /> 3) a species of the genus Populous (poplar) ; or <br /> 4) female ginko. <br /> SUBDIVISION 16. INTERIOR PARKING LOT LANDSCAPING. <br /> a) All parking lots containing over 150 stalls shall be designed <br /> to incorporate unpaved, landscaped islands in number and <br /> dimension as required by the city. All landscape islands <br /> shall contain a minimum of 180 square feet. Islands which are <br />