Log in to the online system and complete the bid or proposal. In order to submit a bid, you must first register with the Supplier Portal.All pages should be single sided. • Use the Cover Page that is provided in the Bid Proposal (posted on the IDOT Web Site) as the first page of your submitted. Each invitiation to bid is posted on our website and can be found under the section titled "Current Solicitations". Postings include all outgoing grants and open-ended PT services. Each proposal contains all certifications and affidavits, a proposal signature sheet and a proposal bid bond. PREQUALIFICATION. Contractors must fill out the ATP2 Form and submit NYSDOL. AT-10 Form(s) within 24 hours of low bid.