151.09 CLASS A SMALL TREES.
   For the purpose of this chapter, small trees, including by example the following recommended types of trees, shall be deemed to be in the Class A category:
 
   Amur Corktree
Japanese Tree Lilac
   Amur Maackia
Hornbeam
   Amur Maple
North Star Cherry
   Cockspur Hawthorn
Sargent Cherry
   Crabapple
Serviceberry (single stem)
   Eastern Redbud
Tatarian Maple
   Japanese Pagoda
Washington Hawthorn (single stem)
 
Trees in the Class A category may be planted under the following conditions:
   1.   Where there is a minimum growing space of 25 feet diameter.
   2.   Where there is an existing sidewalk and street pavement in the public right-of-way, midway between the street and the existing sidewalk but not less than two feet from the sidewalk and not less than three feet from the street; except for Maple trees, which shall not be less than three feet from the sidewalk and not less than four feet from the street.
   3.   Where there is no existing sidewalk or pavement in the public right-of-way, clearance distances for planting shall be the same as if the sidewalk and pavement were in place.
   4.   Trees in the least restricted category, which have reached a height exceeding 14 feet, shall be pruned so that all branches and limbs are removed from the trunk up to a height of at least six feet from the ground.