Public utility service companies shall have the authority to prune trees, using acceptable branch thinning techniques, to remove branches or limbs, which disrupt utility service lines. When half or more of the mature tree shape has been removed due to pruning or other cause, as determined by the Forestry Commission, the public utility service company shall first give notice to the adjacent property owner and the City, and completely remove the tree, excluding the stump. The cost incurred by the utility for the tree removal shall not be assessed against the adjacent property owner.