Public Works Contracting. Learn how the County buys products and services.Search contracts, find open solicitations on BuyNet. 1. Proposal Form: Complete, sign and submit form. 2. Can you give me an example of a letter requesting an extension for a project submission date? The Department is requesting a 3month PostFact time extension to extend the period of project allocation. Bidders are required to complete the entire. Bid Form and supplements (if applicable). a.