All permits issued for the installation of public utilities which affect public trees or shrubs shall be approved by the Forester. A public utility may be issued a permit to treat, trim or remove any tree or shrub on any street or other public place, but such work shall be limited to the actual necessities of the service of the company and shall be done in accordance with the arboricultural specifications and standards of practice set forth in Chapter 151. If it is deemed necessary by the Forester, an inspector may be assigned to supervise the provisions of the permit and the cost of such service shall be charged to the public utility.