The standard purchasing process for Allegheny County involves: requisitioning; public solicitation; bid and proposal receipt; evaluation and contract award. View Public Works' open solicitations, and learn more about how to register as a supplier and submit a bid or proposal.BID PROPOSAL: Please see the form located in section 004123. RFPs outline the bidding process and contract terms and provide guidance on how bids should be formatted and presented. This document includes an information sheet entitled: ALLEGANY COUNTY. All plan holders and meeting attendees will receive the meeting minutes and addendum(s).