A private sewage disposal system shall not be operated until the installation is completed in accordance with the requirements of this title. The director of public works may inspect the work at any stage of construction and, in any event, the applicant for the permit shall notify the director of public works when the work is ready for final inspection, and before any underground portions are covered. The final inspection shall be made within two business days of the receipt of the notice by the director of public works whenever possible. When the work is properly completed, the director of public works shall give approval for the system to be used. (Ord. 781 § 40, 1975; Ord. 147 § 4.06, 1963)