The bid sheet includes a sample list of various automotive items purchased by the NTTA. The purpose of the proposed contract will be to allow the NTTA to purchase any item in the manufacturer’s catalog at the established discount. All repair work will require a diagnostic estimate be approved by an NTTA Fleet Supervisor prior to work being performed. Repair estimates shall include a timeframe in which the work will be completed. Vendor will be held to the expectation that work will be completed and delivered based on time given on estimate. After authorization has been given to proceed, any additional work will require a revised estimate from the vendor. Any work performed outside of the scope of what is authorized, shall not be billed to the NTTA, and may not be reimbursed.