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1 Attachment 2: Landscaping and Tree Preservation Standards REVISED May 26, 2010 Page 10 <br />anticipated use. Mulch is acceptable in landscape beds and areas not suitable for <br />living groundcovers. <br />iv. Hardy perennial forbs and ornamental grasses should be used in car overhang <br />areas and places where snow may be stored. <br />4) Annual plantings should be minimized within 10' of a tree. The process of frequently <br />replanting may damage the tree's shallow root system. <br />5) Seed mixes should be used in large expanses of naturalized areas. The City shall <br />maintain a list of approved seed mixes. Where seed mixes are used, the City may <br />request that visible edge treatments be planted with more deliberate groupings of <br />flowering plants. <br />6) A permanent solid edge such as a 6" concrete, stone or other barrier is required <br />between native seeded areas and turf unless otherwise approved by the City. <br />b. Planting Requirements: <br />1) To promote development of a large, healthy canopy, trees shall be planted in <br />accordance with the requirements in the following table and illustration: <br />Planting Requirements <br />Tree Size <br />Minimum <br />island width <br />for roots <br />(back of curb <br />to back of <br />curb) <br />Minimum <br />tree <br />opening <br />Minimum <br />planting <br />soil <br />depth <br />Minimum <br />cubic feet <br />of soil <br />available <br />per tree in <br />a single <br />bed <br />Minimum <br />cubic feet of <br />soil available <br />per tree in a <br />shared bed or <br />three sided <br />island <br />Large Tree <br />9, 0„ <br />4' x 6' or <br />5' x 5' <br />2430" <br />440486 CF <br />— <br />400325 CF <br />— <br />Medium Tree <br />6' -0" <br />4' x 6' or <br />5' x 5' <br />2430" <br />— <br />300256 CF <br />— <br />27024 -5 CF <br />— <br />Small Tree <br />5' -0" <br />4' x 5' <br />1830" <br />250486 CF <br />2254-35 CF <br />F <br />c <br />a L <br />E 51y <br />c <br />inimum Island Width <br />i <br />Calculate planting soil volume by Length x Width x Depth <br />16' typical car space <br />At tr. Tea LIGel <br />nf:.ic = .litTttt ?�: <br />Planting Soil <br />Engineered Planting Soil <br />Minimum Island Width dimension can be reduced to the Minimum Tree Opening dimension if <br />engineered planting soils are used beneath adjacent hardscape to achieve required soil volume. <br />• <br />• <br />• <br />