The Site Plan submitted with an application, together with the conditions, if any required by the Planning Commission and/or Council, shall be kept on file in the office of the Planning Director and shall be referred to prior to issuing a building permit. Where there is a substantial change from the original Site Plan, said plan shall be referred to the Planning Commission for action, under the procedures of Chapter 18.40 (Site Plan Review). No modifications to the conditions of the original resolution granting the Conditional Use Permit shall be permitted without a public hearing as required in Chapter 18.43 (Hearings and Appeals Therefrom). In case of such a hearing, a new application, filing fee, and procedure shall be required.