Nassau County Department of Public Works is requesting proposals from firms to provide Construction. Proposals should only be submitted after careful examination of the complete RFP and its requirements.Quote comprising your inclusions and exclusions, then methodology how you going to carry out the work, construction programme how long it will take you. To access Bid Contract solicitations and Request for Proposal documents to download and view for free, click on the "Vendor Portal" link. Cost Proposal Form attached as Appendix A (to be submitted in a separate, sealed envelope). 2.