All trade contractors need to complete our Subcontractor Qualification Application to be eligible to bid on our projects and contract with Clark. Learn about current bid and contract opportunities available to consultants, service providers, contractors, vendors, or suppliers.GUIDELINES – The advertisement must be published at least once and not less than 7 days before a bid opening. Clark. All Bids must be in accordance with the contract documents on file at the Lewis and Clark. Bystep guide to understanding the bidding process, along with tips on submitting a successful bid.