HomeMy WebLinkAbout3.24 Tree Retention WorksheetTREE PROTECTION DETAIL
Protection Measures During Construction: Protection measures in this subsection shall apply for all trees that are to
be retained. All of the following tree protection measures shall apply:
a. Construction Storage Prohibited: The applicant may not fill, excavate, stack or store any equipment, dispose of
any materials, supplies or fluids, operate any equipment, install impervious surfaces, or compact the earth in any
way within the area defined by the drip line of any tree to be retained.
b. Fenced Protection Area Required: Prior to development activities, the applicant shall erect and maintain six-foot
(6') high chain link temporary construction fencing around the drip lines of all retained trees or at a distance
surrounding the tree equal to one and one-quarter feet (1.25') for every one inch (1") of trunk caliper, whichever is
greater, or along the perimeter of a tree protection tract. Placards shall be placed on fencing every fifty feet (50')
indicating the words, “NO TRESPASSING – Protected Trees,” or on each side of the fencing if less than fifty feet
(50'). Site access to individually protected trees or groups of trees shall be fenced and signed. Individual trees shall
be fenced on four (4) sides. In addition, the applicant shall provide supervision whenever equipment or trucks are
moving near trees.
c. Protection from Grade Changes: If the grade level adjoining to a tree to be retained is to be raised, the applicant
shall construct a dry rock wall or rock well around the tree. The diameter of this wall or well must be equal to the
tree’s drip line.
d. Impervious Surfaces Prohibited within the Drip Line: The applicant may not install impervious surface material
within the area defined by the drip line of any tree to be retained.
e. Restrictions on Grading within the Drip Lines of Retained Trees: The grade level around any tree to be retained
may not be lowered within the greater of the following areas: (i) the area defined by the drip line of the tree, or (ii) an
area around the tree equal to one and one-half feet (1-1/2') in diameter for each one inch (1") of tree caliper. A larger
tree protection zone based on tree size, species, soil, or other conditions may be required. (Ord. 5676, 12-3-2012)
f. Mulch Layer Required: All areas within the required fencing shall be covered completely and evenly with a
minimum of three inches (3") of wood chip mulch prior to installation of the protective fencing. Exceptions may be
approved if the mulch will adversely affect protected ground cover plants. (Ord. 5676, 12-3-2012)
g. Monitoring Required during Construction: The applicant shall retain a certified arborist or licensed landscape
architect to ensure trees are protected from development activities and/or to prune branches and roots, fertilize, and
water as appropriate for any trees and ground cover that are to be retained.
h. Alternative Protection: Alternative safeguards may be used if determined to provide equal or greater tree
protection. (Ord. 5676, 12-3-2012)
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