A notice of intent to make award must be furnished to the successful offeror no later than the time set for acceptance in the RFP or any extension to which the offeror has agreed. The notice must advise the supplier of any required bonds and the date by which the supplier must execute and return such bonds. When all required bonds have been received, the contracting officer will make award and issue a notice to proceed. The contracting officer may issue the notice to proceed at the time of award or may issue it at the preconstruction conference. The contracting officer then will send a written notice of the award to all offerors who submitted a proposal and any other known interested parties within the Postal Service or the public.