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Deciduous trees shall have a minimum caliper of 21/2 inches.Coniferous trees shall be a minimum of six <br /> feet in height.Ornamental trees shall have a minimum caliper of 11/2 inches. <br /> 4. All site areas not covered by buildings,sidewalks, parking lots,driveways,trails, patios,or similar <br /> hardcover shall be covered with sod or an equivalent ground cover approved by the city.This <br /> 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 sprinkler system <br /> shall be provided as part of each new development, except one-and two-family dwellings and additions <br /> to existing structures which do not at least equal the floor area of the existing structure.A sprinkler <br /> system shall be 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 <br /> shall 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 <br /> square feet. Islands which are necessary to promote the safe and efficient flow of traffic shall not be <br /> subject to the 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 <br /> as determined appropriate by the planning commission. Parking lot landscape trees shall be provided at <br /> the rate of one tree 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 equivalent <br /> approved by the 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 <br /> site or landscape plan,and which have died,shall be replaced within three months of notification by the city. <br /> However,the time for compliance may be extended up to nine months by the city in order to allow for <br /> seasonal or weather conditions. <br /> e. Retaining walls. Retaining walls exceeding four feet in height,and staged walls which cumulatively exceed 16 <br /> feet in height or involve more than four tiers,must be constructed in accordance with plans prepared by a <br /> registered engineer or landscape architect. <br /> f. Landscaping performance security required.When screening, landscaping or other similar improvements to <br /> property are required by this division,a letter of credit shall be supplied by the owner in an amount equal to <br /> at least 1'h times the value of such screening,landscaping or other improvements.The letter of credit shall <br /> be conditioned upon reimbursement of all expenses incurred by the city for engineering, legal,contracting or <br /> other fees in connection with making or completing such improvements.The letter of credit shall be provided <br /> prior to the issuance of any building permit and shall be valid for a period of time equal to two full growing <br /> seasons after the date of installation of the landscaping.The city may accept some other form of security in <br /> lieu of a letter of credit in an amount and under such conditions that the city may determine to be <br /> appropriate. If construction of the project is not completed within the time prescribed by building permits <br /> and other approvals,the city may,at its option,complete the work required at the expense of the owner and <br /> the surety.The city may allow an extended period of time for completion of all landscaping, if the delay is due <br />