§ 8178-7.4.3. Determining the tree protected zone.

The tree protected zone is the area that encompasses the above-ground portion of the protected tree as well as the area in which a critical amount of the tree's roots may be found. To avoid damage to a protected tree's roots, the calculation noted in (a) below shall be performed for all protected trees where the tree canopy is within twenty (20) feet of areas proposed to be disturbed, including disturbance associated with fuel modification. The Planning Director may increase the 20-foot distance from disturbed areas where necessary to ensure that protected tree zones are calculated for all protected trees that could potentially be damaged by new development. The tree protected zone calculation shall be based on a surveyed map or site plan of the canopy of each protected tree.

a.

The tree protected zone shall be calculated using one of the following methods. The calculation that provides the largest area of protection shall constitute the tree protected zone, and shall be depicted on a site plan.

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1.

Draw a circle around the tree that is no less than fifteen (15) feet from the trunk of the protected tree;

2.

Multiply the tree's diameter in inches by one and a half (1.5) feet (i.e., one inch equals one and a half feet). For example, if a tree's diameter at a height of four and one-half (4.5) feet above existing grade is eleven (11) inches, the tree protected zone would be sixteen and one-half (16.5) feet from the trunk of the protected tree; or

3.

Draw a circle that extends a minimum five (5) feet outside the edge of the protected tree's dripline.

Example of Tree Protected Zone

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(Ord. No. 4492, § 6, 6-21-2016)