It is unlawful for any person or firm to top, dehorn or pollard any public tree. Trees severely damaged by storms or other causes, or trees creating emergency hazardous situations, are exempt from this section. Trees under utility wires or other obstructions where standard pruning practices are impossible may be exempted from this section with the prior written approval of the director of parks and recreation. (Ord. 75-88 § 1, 1988)