Bids are generally submitted in the county's electronic bidding system, Supplier Portal. The Bidding Requirements consist of the Invitation to Bid, Instructions to Bidders,.Please fill out and upload all required document(s) as outlined in the Bid. Failure to submit required document(s) may cause County to reject a bid. Purchasing and Contract Services - Procurement portal for managing bids, soliciations, purchasing and vendors. Each invitiation to bid is posted on our website and can be found under the section titled "Current Solicitations". 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. Hennepin Healthcare has several areas of contracting, including submitting proposals or bids and other procedures for contracting.