Restoration of the street shall be completed within 30 days after inspection and approval of the construction by the Director of Public Works. If work is not completed within the 30 days, the city may proceed to do the restoration work, and the cost shall be deducted from the cash or a claim made against the construction bond. If the restoration work done by the applicant needs repair as determined by the Director of Public Works during the one year guaranty period, the applicant shall do all necessary repair work, and in the event applicant fails or refuses to do the necessary repair work, the city may do the same, and the cost thereof deducted from the cash deposit or claim made against the construction bond. To ensure proper restoration in cases deemed necessary by the Director of Public Works, the city, at its option, may do all restoration of the street, and the cost thereof shall be deducted from the cash deposited with the city. In situations where the city opts to do restoration work, the city shall require the cash deposit as the form of security. On completion of the restoration of the site and the passing of the one year guaranty period, the cash or the balance thereof remaining shall be refunded to the applicant. In the event restoration costs shall exceed the amount of the deposit, the applicant shall be liable for any additional costs.