(1) All tariffs, supplements or revised pages must be delivered to the commission free from all charges.

(2) Each company or agent must file tariffs under serial numbers of its own.

(3)(a) Copies of each tariff, supplement, revised page or other schedule shall be included in one package and under one letter of transmittal.

(b) Letters of transmittal may be in duplicate. In that event one copy will be stamped with the date received by the commission and returned to the sender as a receipt for the publication.

(c) Tariffs mailed for filing must be addressed: Washington Utilities and Transportation Commission, Olympia, Washington.

(4) Tariffs, supplements or revised pages which are received for filing too late to give the commission the required notice are subject to rejection and return. The filing date will be considered the actual date the publication is received by the commission at its office in Olympia except as provided in WAC 480-149-120(1). No consideration will be given to delays in transmittal.

(5) When a tariff publication is rejected by the commission the number which it bears must not again be used. The publication which is issued in lieu of such rejected publication must bear the notation "Issued in lieu of . . . . . . rejected by the Washington Utilities and Transportation Commission."