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� � <br /> Ornamental deciduous 1.5-inch bb(Caliper) Not required;but two <br /> trees ornamental deciduous <br /> trees may be <br /> substituted for one <br /> required overstory <br /> deciduous tree <br /> (maximum substitution <br /> � equals 25 percent of <br /> required overstory <br /> deciduous trees) <br /> Credits for existing trees:The city council shall have sole discretion whether <br /> credit shall be granted for existing healthy trees <br /> In instances where healthy plant materials of acceptable species exist on a site prior to <br /> its development,the application of the standards in subsection(14)b of this section <br /> may be adjusted by the city to allow credit for such material,provided that such <br /> 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 <br /> and to incorporate them into the site plan. <br /> 3. All new overstory trees shall be balled and burlapped or moved from the growing site <br /> by tree spade. Deciduous trees shall have a minimum caliper of 21/2 inches. <br /> Coniferous trees shall be a minimum of.six feet in height.Ornamental trees shall have a <br /> minimum caliper of 11/2 inches. <br /> 4. All site areas not covered by buildings,sidewalks,parking lots,driveways,trails,patios, <br /> or similar hardsurface materials shall be covered with sod or an equivalent ground <br /> cover approved by the city.This requirement shall not apply to site areas retained in a <br /> 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 <br /> two-family dwellings and additions to existing structures which do not at least equal <br /> the floor area of the existing structure.A sprinkler system shall be provided for all <br /> 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 <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. - (NOT APPLICABLE,REMOVED) <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 <br /> are required by an approved site or landscape plan,and which have died,shall be replaced <br /> within three months of notification by the city. Ho.wever,the time for compliance may be <br /> extended up to 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 <br /> cumulatively exceed 16 feet in height or involve more than four tiers, must be constructed in <br /> accordance with plans prepared by a registered engineer or landscape architect. <br /> f. Landscaping performonce security required.When screening, landscaping or other similar <br /> improvements to property are required by this division, a letter of credit shall be supplied by <br /> the owner in an amount equal to at least 11/2 times the value of such screening,landscaping or <br /> other improvements.The letter of credit shall be conditioned upon reimbursement of all <br /> expenses incurred by the city for engineering,legal,contracting or other fees in connection with <br /> making or completing such improvements.The letter of credit shall be provided prior to the <br /> issua.nce 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 <br /> of security in lieu of a letter of credit in an amount and under such conditions that the city may <br /> determine to be appropriate. If construction of the project is not completed within the time <br />