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Overstory 2.5-inch bb One tree per 1,000 gross square feet of building footprint area or one tree per 40 lineal feet of site deciduous trees (Caliper) 1 perimeter,whichever is greater. Coniferous trees 6-foot height bb Minimum of 30 percent of required overstory trees must be coniferous Understory shrubs 3-gal.potted or One shrub per 300 gross square feet of building footprint area or one shrub per 30 lineal feet of site 18-inch perimeter,whichever is greater. Ornamental 1.5-inch bb Not required;but two ornamental deciduous trees may be substituted for one required overstory 1 deciduous trees 1(Caliper) deciduous tree(maximum substitution equals 25 percent of required overstory deciduous trees) i Credits for existing trees:The city council shall have sole discretion whether credit shall be granted for existing healthy trees In instances where healthy plant materials of acceptable species exist on a site prior to its development,the application of the standards in subsection(14)b of this section may be adjusted by the city to allow credit for such material,provided that such adjustment is consistent with the intent of this division. 2. A reasonable attempt shall be made to preserve as many existing trees as is practicable and to incorporate them into the site plan. 3. All new overstory trees shall be balled and burlapped or moved from the growing site by tree spade.Deciduous trees shall have a minimum caliper of 2%:inches.Coniferous trees shall be a minimum of six feet in height.Ornamental trees shall have a minimum caliper of 1'/: inches. 4. All site areas not covered by buildings,sidewalks,parking lots,driveways,trails,patios,or similar hardcover shall be covered with sod or an equivalent ground cover approved by the city.This requirement shall not apply to site areas retained in a natural state. 5. In order to provide for adequate maintenance of landscaped areas,an underground sprinkler system shall be provided as part of each new development,except one-and two-family dwellings and additions to existing structures which do not at least equal the floor area of the existing structure.A sprinkler system shall be provided for all landscaped areas,except areas to be preserved in a natural state. 6. Not more than 50 percent of the required number of trees shall be composed of one species.The city shall maintain a list of prohibited species,which shall not be used for landscaping. c. Interior parking lot landscaping. 1. All parking lots containing over 100 stalls shall be designed to incorporate unpaved,landscaped islands in number and dimension as required by the city.All landscape islands shall contain a minimum of 180 square feet.Islands which are necessary to promote the safe and efficient flow of traffic shall not be subject to the 100-stall standard and shall be required by the city when warranted. 2. Parking lot landscape areas,including landscape islands,shall be reasonably distributed throughout the parking lot area so as to break up expanses of paved areas.Parking lot landscape areas shall be provided with deciduous shade trees,ornamental or evergreen trees,plus ground cover,mulch and/or shrubbery as determined appropriate by the planning commission.Parking lot landscape trees shall be provided at the rate of one tree for each 15 surface parking spaces provided,or major fraction thereof.Parking lot landscaping shall be contained in planting beds bordered by a raised concrete curb or equivalent approved by the planning commission. d. Maintenance of landscaping.The owner,tenant and their respective agents shall be jointly and severally responsible for the maintenance of all landscaping in a condition presenting a healthy,neat and orderly appearance and free from refuse and debris.Plants and ground cover which are required by an approved site or landscape plan,and which have died,shall be replaced within three months of notification by the city.However,the time for compliance may be extended up to nine months by the city in order to allow for seasonal or weather conditions. e. Retaining walls. Retaining walls exceeding four feet in height,and staged walls which cumulatively exceed 16 feet in height or involve more than four tiers,must be constructed in accordance with plans prepared by a registered engineer or landscape architect. Page 6