Upon approval of the city, and in accordance with all city ordinances, policies and standards, a franchisee may, at its sole expense, trim trees upon and overhanging streets and public rights-of-way within the franchise area so as to prevent the branches of such trees from coming in contact with the wires and cables of a franchisee. A franchisee shall be responsible for debris removal from such activities. Unless otherwise provided in the city’s approval, all tree trimming shall be under the direction of an arborist certified by the International Society of Arboriculture; provided, however, that the requirements of this section shall not apply to the removal or trimming of specific trees during a bona fide emergency when said trees threaten to damage, or have damaged, a franchisee’s system. (Ord. 1708 § 1, 1997).