In carrying out his authority under section 3335 of this title, including the issuance of regulations, the Secretary shall consult with the Department of the Interior; the Department of Health and Human Services; the Department of Commerce; and the Federal Aviation Agency with respect to metropolitan development projects assisted by those departments and agencies; and he shall, for the purpose of section 3336 of this title, accept their respective certifications as to the cost of those projects and the amount of the non-Federal contribution paid or to be paid to that cost.