How do I submit a bid or proposal? All formal bids and proposals shall be submitted as specified in the solicitation document.Below are links to solicitations available through Maricopa County. The bid or Request for Proposal will be designed to be competitively bid following all MCCCD Purchasing guidelines and allowing maximum competition. FAQ: How do I get on a bid or proposal list? Sealed proposals must be received and in the actual possession of the City Procurement Office on or before the exact. Open Book to be used with general contractors bidding out multiple subcontractors. General contractors should use this method of pricing. This is the Request for Proposal (RFP) process. The Maricopa Association of Governments (MAG) is requesting proposals from qualified consultants for the.