A.8 - Tree Root Alteration.

a.

Pursuant to Section 8178-7.5.1, a Planned Development Tree Permit is required for the encroachment into the tree protected zone of a protected tree that is a result of a development project. Examples of encroachments include but are not limited to changing the natural grade, excavating for utilities or fence posts, or paving associated with driveways and streets.

b.

Pursuant to Section 8178-7.5.2, a Zoning Clearance Tree Permit is required to alter the roots of a protected tree, provided that such alteration does not involve encroachment into the tree protected zone and a qualified tree consultant states in writing that the root alteration will not harm the health of the tree.

c.

The tree protected zone is considered the area in which a critical amount of the tree's roots may be found. To determine the tree protection zone, the following calculations noted in 1., 2. and 3. below, shall be performed for all protected trees within 20 feet of areas proposed to be disturbed. The tree protected zone is measured horizontally from the outer circumference of the tree outward to the distance of the calculated tree protected zone. The calculation that provides the maximum protection is considered the designated tree protection zone.

1.

Draw a circle around the tree that is no less than 15 feet from the trunk of the protected tree.

2.

Multiply the tree's diameter in inches by one and a half feet (i.e., one inch equals one and a half feet). For example, if a tree's diameter at a height of 4.5 feet above existing grade is 12 inches, the tree protected zone would be 18 feet from the trunk of the protected tree.

3.

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

d.

Tree Root Alteration shall only be conducted for the following:

1.

When a protected tree is being replanted.

2.

If approved grading or construction activities are occurring near a protected tree and no alternative that avoids disturbance is feasible.

3.

To alter/prune roots from under an existing curb or sidewalk.

4.

As determined by a qualified tree consultant, an inspection reveals root girdling and the roots must be removed in order to preserve the tree.

5.

As approved by a Planned Development Permit.

e.

If a protected tree's roots must be altered/pruned, pruning activities shall include but are not limited to the following:

1.

The alteration/pruning of roots shall be as far away from the tree trunk as possible.

2.

Avoid root alteration/pruning within the tree's protected zone unless there is no feasible alternative (as determined by a qualified tree consultant).

3.

Avoid root pruning during environmentally stressful times such as droughts, floods, active bud break, and shoot growth.

4.

Avoid large roots. No roots greater than two inches in diameter should be altered/pruned.

5.

Prior to root alteration/pruning, excavate the soil away from the roots by hand or with an air spade.

6.

Do not use backhoes or other equipment that rip or tear roots.

7.

Backfill the roots as quickly as possible.

8.

Do not alter/prune roots for the purpose of landscaping.

(Ord. No. 4492, § 9, 6-21-2016)