allows “persons” to donate funds, materials or services in connection with a federal-aid project. Mapping, surveying, environmental, preliminary design and final design are all considered to be services. When TxDOT self-performs services needed for a project, TxDOT may credit the fair market value of donated engineering services to the state share of the project. 23 U.S.C. §323(c) notes any donated funds, or the fair market value of any donated materials or services, accepted and incorporated into the project by the state transportation department shall be credited against the state share. If the LG proposes to apply its costs paid for consultant services to the non-federal share of a project or program, the LG must provide documentation it followed an approved consultant selection process meeting the provisions of . This requirement applies whether or not the LG incurred the cost for these services before it decided to seek federal funds for construction.