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triangulated spacing. See illustration. Planting plans shall include <br />species which are sized to appropriately screen visibility within five <br />years of planting. Small shrubs shall be a planted at a maximum <br />interval of 3' on center; medium shrubs shall be planted at a <br />maximum interval of 4' on center; and large shrubs shall be planted <br />at a maximum interval of 6' on center unless; otherwise authorized <br />by the City. <br />c. A wall or fence intended to provide a continuous year round screen <br />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 combination <br />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 />75' niax <br />2' min cffser <br />i <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 prohibited <br />for screening walls: rock face block or other decorative material is <br />required for masonry walls. Chain link fences with slats are <br />prohibited for screening walls. <br />Maintenance of the required buffer strip planting and /or fence shall <br />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 />