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Ornamental deciduous 1 .5-inch bb (Caliper) Not required; but two ornamental deciduous <br /> trees trees may be substituted for one required <br /> overstory deciduous tree (maximum <br /> substitution equals 25 percent of required <br /> overstory deciduous trees) <br /> Credits for existing trees: The city council shall have sole discretion whether credit shall be <br /> granted for existing healthy trees <br /> J <br /> In instances where healthy plant materials of acceptable species exist on a site prior to its development,the <br /> application of the standards in subsection(14)b of this section may be adjusted by the city to allow credit for <br /> such material,provided that such adjustment is consistent with the intent of this division. <br /> 2. A reasonable attempt shall be made to preserve as many existing trees as is practicable and to incorporate <br /> them into the site plan. <br /> 3. All new overstory trees shall be balled and burlapped or moved from the growing site by tree spade. <br /> Deciduous trees shall have a minimum caliper of 21/2 inches.Coniferous trees shall be a minimum of six feet in <br /> height.Ornamental trees shall have a minimum caliper of 1' inches. <br /> 4. All site areas not covered by buildings,sidewalks,parking lots,driveways,trails, patios,or similar hardcover <br /> shall be covered with sod or an equivalent ground cover approved by the city.This requirement shall not <br /> apply to site areas retained in a natural state. <br /> 5. In order to provide for adequate maintenance of landscaped areas,an underground sprinkler system shall be <br /> provided as part of each new development,except one-and two-family dwellings and additions to existing <br /> structures which do not at least equal the floor area of the existing structure.A sprinkler system shall be <br /> provided for all landscaped areas,except areas to be preserved in a natural state. <br /> 6. Not more than 50 percent of the required number of trees shall be composed of one species.The city shall <br /> maintain a list of prohibited species,which shall not be used for landscaping. <br /> c. Interior parking lot landscaping. <br /> 1. All parking lots containing over 100 stalls shall be designed to incorporate unpaved,landscaped islands in <br /> number and dimension as required by the city.All landscape islands shall contain a minimum of 180 square <br /> feet. Islands which are necessary to promote the safe and efficient flow of traffic shall not be subject to the <br /> 100-stall standard and shall be required by the city when warranted. <br /> 2. Parking lot landscape areas,including landscape islands,shall be reasonably distributed throughout the <br /> parking lot area so as to break up expanses of paved areas. Parking lot landscape areas shall be provided <br /> with deciduous shade trees,ornamental or evergreen trees,plus ground cover,mulch and/or shrubbery as <br /> determined appropriate by the planning commission. Parking lot landscape trees shall be provided at the rate <br /> of one tree for each 15 surface parking spaces provided,or major fraction thereof. Parking lot landscaping <br /> shall be contained in planting beds bordered by a raised concrete curb or equivalent approved by the <br /> planning commission. <br /> d. Maintenance of landscaping.The owner,tenant and their respective agents shall be jointly and severally <br /> responsible for the maintenance of all landscaping in a condition presenting a healthy,neat and orderly <br /> appearance and free from refuse and debris. Plants and ground cover which are required by an approved site or <br />