How do I submit a bid or proposal? All formal bids and proposals shall be submitted as specified in the solicitation document.Bid Bond: Submit a certified or cashier's check or a surety bond, payable to Northern. Specified in the Contract Documents, complete and ready for final payment,. ENGINEER will make a corresponding final inspection with OWNER and. We design and install a variety of project. Contract Duration 3 years. Contract Renewal 7 annual renewals.