Improvement standards. All private and public streets, both internal and external, including grading and paving, driveways, parking areas, sidewalks, curbs, gutters, streetlighting, shade trees, water mains, water systems, culverts, storm sewers, sanitary sewers, pumping stations, drainage structures, stormwater management facilities, recreational facilities, and any such other improvements as may be found to be necessary in the public interest, shall be installed at the expense of the developer, provided that such standards may be modified by the Planning Board on recommendation by the Borough Engineer. Such improvements shall be completed to the satisfaction of the Mayor and Borough Council before a certificate of occupancy may be issued. The installation of all required improvements affecting the public interest shall be subject to the inspection and approval of the Borough Engineer.