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Also, an approved tree removal permit is always required for the removal or alteration of landmark trees, defined as trees with a diameter at breast height (DBH) of greater than 30 inches. The City wants to emphasize the importance of retaining older large trees, so trees with a DBH of greater than 30 inches cannot be removed without an approved tree removal permit.
Multi-family and Commercial Properties - Any Significant Tree removal requires a permit.
Specifically this city code addresses pruning:
18.12.140 Landscape standards and specifications.J. Tree Pruning: 1. All pruning shall be done to the most recent National Arborist Association Standards: ANSI Z133.1 (2001) for safety factors and Z300 (part 1) for pruning. It is recommended that all pruning be done to Class I (Fine Pruning), Class II (Standard Pruning), or Class III (Hazard Pruning) standards. Class IV (Crown Reduction Pruning) shall only be done for the following reasons: a. Branches interfering with utility lines. (See FAQ regarding trees in utility lines) b. Significant crown die-back has occurred. c. Storm damage or prior incorrect pruning requires correction. 2. In no case is topping (the severe reduction of branches without consideration of the specifications for cutting back) allowed. 3. No more than twenty-five (25) percent of the total canopy may be removed unless approved by the City’s Horticulturist.