All utilities shall be underground. Water sources and distribution systems shall be approved by the appropriate Township authorities as to the adequacy, quality and sufficiency for fire-fighting purposes. The builder shall install, at his expense, fire alarm boxes as required. The placement and number of fire hydrants shall be subject to the approval of the appropriate Township authorities. No certificate of occupancy shall be issued for any multiple dwelling unless and until the Township Engineer certifies that as-built drawings, certified by a licensed professional engineer, showing the precise location of all underground utilities, manhole, valves, tap-ins and appurtenances thereto, have been filed in his office. After certification by the Township Engineer, the as-built drawings shall be permanently filed with the office of the Secretary of the Planning Board.