Vendors and suppliers interested in doing business with Allegheny County can review open solicitations for Purchasing and Supplies bids on the Bonfire website. Please fill out ALL fields on the Bidder Registration form.Steps in the grant-seeking process. How to draft a proposal. The Allegheny County Sewer Authority (ALCOSAN) is seeking proposals, through this. Sign up to receive a text message or email when new bids are added! Fringe Benefit Letter. Proposals must be submitted in the format described in this RFP. Q: Will I be notified if my proposal is not complete or correctly filled out? A separate nonrefundable cost will be required for shipping and handling charges if mailing is requested.