The street excavation permit shall be acted upon by the applicant therefor within twenty-four hours from and after the date of its issuance and the excavation made or work done thereunder shall be completed within three days. However, the Director of Safety-Service may grant an extension of such permit and the same shall be endorsed on the back of such permit with the reason therefor, dated and signed by the Director.
(R.O. 1946, C. 31, Sec. 28.)