Two original contracts, or two photostatic copies of the original contract, for the doing of any proposed street work pursuant to the provisions of this Article shall accompany the application for permission to do the proposed work together with a diagram showing thereon the lots and lands signed for by the respective owners thereof, or by their agents, as indicated in such contract and the respective frontages so signed for; and to such contracts accompanying such application there shall be attached affidavits sworn to before a notary public that the signatures of said owners or their agents respectively appearing in such contracts, are genuine, and were to the actual knowledge of affiant subscribed by said owners or said agents, respectively, and that the frontage set opposite the said signatures, severally, is correct according to affiant's best information and belief.