Whenever any excavation is to be made within a public right of way, the applicant shall deposit with the Building Commissioner and/or the Service Director an amount determined by the Building Commissioner or the Service Director to ensure that the property involved is repaired and restored to its original condition. All of such deposit, except for the sum of fifty dollars ($50.00) per inspection, to ensure compliance with this section, shall be returned to the applicant when the work has been completed to the satisfaction of the Building Commissioner and/or the Service Director.