Bids are invited on the basis of a Single Prime Contract. Register to use the MECKProcure portal to monitor upcoming opportunities, bid on projects and manage your vendor profile.MeckProcure Guides for Vendors. This page displays contracting opportunities from Aviation and some construction contracts from City Procurement. • Provide total bid on the bid form. The Contractor must acknowledge any revision to the bid documents in the space provided on the bid form and it must be submitted with their bid. Pursuant to the statute, this form gathers information about the contractors seeking to qualify for the work and provides the prequalification criteria.