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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 <br /> to incorporate them into the site plan. <br /> 3. All new overstory trees shall be balled and burlapped or moved from the growing site by <br /> tree spade. Deciduous trees shall have a minimum caliper of 21/2 inches. Coniferous trees <br /> shall be a minimum of six feet in height. Ornamental trees shall have a minimum caliper of <br /> 11/2 inches. <br /> 4. All site areas not covered by buildings,sidewalks, parking lots, driveways,trails, patios, or <br /> similar hardcover shall be covered with sod or an equivalent ground cover approved by the <br /> city.This requirement shall not apply to site areas retained in a natural state. <br /> 5. In order to provide for adequate maintenance of landscaped areas,an underground <br /> sprinkler system shall be provided as part of each new development, except one-and two- <br /> family dwellings and additions to existing structures which do not at least equal the floor <br /> area of the existing structure.A sprinkler system shall be provided for all landscaped areas, <br /> 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 <br /> species.The city shall maintain a list of prohibited species,which shall not be used for <br /> landscaping. <br /> c. Interior parking lot landscaping. <br /> 1. All parking lots containing over 100 stalls shall be designed to incorporate unpaved, <br /> landscaped islands in number and dimension as required by the city.All landscape islands <br /> shall contain a minimum of 180 square feet. Islands which are necessary to promote the <br /> safe and efficient flow of traffic shall not be subject to the 100-stall standard and shall be <br /> required by the city when warranted. <br /> 2. Parking lot landscape areas, including landscape islands,shall be reasonably distributed <br /> throughout the parking lot area so as to break up expanses of paved areas. Parking lot <br /> landscape areas shall be provided with deciduous shade trees, ornamental or evergreen <br /> trees, plus ground cover, mulch and/or shrubbery as determined appropriate by the <br /> planning commission. Parking lot landscape trees shall be provided at the rate of one tree <br /> for each 15 surface parking spaces provided, or major fraction thereof. Parking lot <br /> landscaping shall be contained in planting beds bordered by a raised concrete curb or <br /> equivalent approved by the planning commission. <br /> d. Maintenance of landscaping.The owner,tenant and their respective agents shall be jointly and <br /> severally responsible for the maintenance of all landscaping in a condition presenting a healthy, <br /> neat and orderly appearance and free from refuse and debris. Plants and ground cover which are <br /> required by an approved site or landscape plan, and which have died, shall be replaced within <br /> three months of notification by the city. However,the time for compliance may be extended up to <br /> nine months by the city in order to allow for seasonal or weather conditions. <br /> e. Retaining walls. Retaining walls exceeding four feet in height,and staged walls which cumulatively <br /> exceed 16 feet in height or involve more than four tiers, must be constructed in accordance with <br /> plans prepared by a registered engineer or landscape architect. <br /> f. Landscaping performance security required.When screening, landscaping or other similar <br />