View Public Works' open solicitations, and learn more about how to register as a supplier and submit a bid or proposal. The standard purchasing process for Allegheny County involves: requisitioning; public solicitation; bid and proposal receipt; evaluation and contract award.Steps in the grant-seeking process. How to draft a proposal. The Allegheny County Sewer Authority (ALCOSAN) is seeking proposals, through this. All prospective bidders are required to execute the Bid Schedule, Bid Bond, Proposal, Non-. Com under "Business Opportunities". Participation Statement. Copies of RFP documents are not available for inperson pickup. Complete this form and submit with your bid.