The City will require an inspector during the installation of all lines to review compliance with this chapter. The inspector shall have the right, during reasonable hours and after showing proper identification, to enter any installation site in the discharge of the inspector’s official duties, and to make any inspection or test that is reasonably necessary to protect the public health, safety and welfare. The applicant shall pay the actual costs directly attributable to the installation inspection conducted by the City. Payment shall be made within 30 days of receipt of invoice from the City. Payments not made in such time shall be subject to reasonable interest charges.