These templates fit various scenarios, whether pitching to a new client, following up on a discussion, or introducing a new product or service. No faxed or email proposals will be accepted.If you are interested in receiving information regarding upcoming business opportunities with Contra Costa County, please fill out the form below. Respondents shall submit proposals which are concise and specifically respond to the specifications posted in this RFP. 3 Using the budget from Section 2.2 Project Budget, please fill in the following information. All bidders, proposers, vendors, and contractors must be registered in AC Transit's Supplier Portal. Proposal Submittal Address and Email.