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 shall contain an acknowledgement of receipt of all Addenda (the numbers of which must be filled in the Bid Form). 10.8. Proposals must be completed in ink or typewritten and a completed proposal response returned to the City Procurement. The City of Maricopa will accept competitive sealed proposals for the playground surface replacement at. The bid or Request for Proposal will be designed to be competitively bid following all MCCCD Purchasing guidelines and allowing maximum competition.