Documents are in Adobe Acrobat format. Please note that the below list is for informational purposes only.To access a bid please go to Vendor Portal and click the "Nassau County Procurement". To access Bid Contract solicitations and Request for Proposal documents to download and view for free, click on the "Vendor Portal" link. For additional requirements involving samples, please see section titled "Samples" after Non Collusion Bidding Certification. 11. In the best interest of NCSB, NCSB reserves the right to reject any or all proposals, with or without cause, or to accept the proposal which, in its sole. View the Town of Hempstead procurement guidelines. Requests for Proposals. Concerning this Request for Proposals (the "Request" or "RFP") is: Steven C. Ballas, Comptroller. Bid Writer, Thomas O'Brien.