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shrubs shall be planted at a maximum interval of 6' on center <br />unless; otherwise authorized by the City. <br />c. A wall or fence intended to provide a continuous year round <br />screen shall block visibility completely. <br />d In addition to the shrub cover required in the table above, all <br />screens shall be planted with large trees every 50 LF, medium <br />trees every 35 LF, or small trees every 25 LF or some <br />combination thereof, along the length of the screen. <br />e. Existing vegetative screens should be left in place unless <br />composed of invasive species or otherwise directed by the City. <br />Existing screens may be enhanced with new plantings to comply <br />with the standards. <br />f. Berms shall be irrigated, have maximum side slopes of 3:1, and <br />have no less than four (4) inches of topsoil. <br />g. <br />Permanent walls and fences shall be <br />offset by a minimum of 2' at intervals <br />of 75' maximum length for stability and <br />visual relief. See illustration. <br />h. Approved permanent wall/fence materials shall include wood, <br />metal, masonry, concrete stone, or other prefabricated and/or <br />sustainable materials. Non -decorative concrete block is <br />prohibited for screening walls: rock face block or other decorative <br />material is required for masonry walls. Chain link fences with slats <br />are prohibited for screening walls. <br />Maintenance of the required buffer strip planting and/or fence <br />shall be the responsibility of the individual property owners or, if <br />applicable, the homeowners association. <br />7 Boulevard Tree Standards: <br />a. Boulevard trees are required at the rate of one tree per 70 linear <br />feet of road frontage where property fronts any public road. The <br />City shall collect a standard fee per tree based on the estimated <br />market rate cost to purchase and install trees within the <br />development site. <br />b. Existing trees may be used to fulfill boulevard tree standards at <br />the City's discretion. <br />8. General Landscaping Standards: <br />a. Desirable existing trees may be used to fulfill Canopy Cover, <br />Foundation Landscape and Open Areas Landscape standards if <br />