The director shall establish a permit system to be used to authorize street tree removal. The director shall use his or her discretion with respect to tree removal permits as governed by this chapter and by the street tree guidelines. No person will be authorized to remove trees covered by this chapter without first having received a permit to do such work. Permits shall not be valid for a period longer than thirty (30) days from issuance date. Exceptions, in the discretion of the director, shall be those permits issued to public utilities serving the area, which permits may be valid for a period of one year. (Ord. 2004-21 (part), 2004)