No person, firm or corporation shall dig or excavate, or cause to be dug or excavated within, through or under any street, alley, sidewalk or public place in the city, for any purpose under this section, without obtaining a permit from the code enforcement office; and all permits issued hereafter to dig or excavate in any street, avenue, alley or sidewalk, for the purpose of laying down or repairing any sewer service pipe or any connection with any public or district sewer or drain, shall only authorize such work to be done under the direction and control of such person or persons as shall comply with this section. (2001 Code § 150.101)