All refilling of excavations and all resurfacing of openings in the streets shall be done by the proper officers and employees of the City, except as provided in Section 903.03, and the cost of such refilling and resurfacing shall be charged to the holder of the permit under which the openings were made. Such part of such deposit as may remain after deducting the cost of refilling and resurfacing shall be returned to the applicant upon the completion of resurfacing. If the cost of such resurfacing is more than the amount deposited, such excess shall be collected from the applicant.