As the excavation work progresses, all streets shall be thoroughly cleaned of all rubbish, excess earth, rock and other debris resulting from such work. All clean up operations at the location of such excavations shall be accomplished at the expense of the permittee and shall be completed to the satisfaction of the Director of the Department of Public Works. From time to time as may be ordered by the Director of the Department of Public Works, and in any event, immediately upon completion of the work, the permittee shall, at his or its own expense, clean up and remove all refuse and unused material of any kind resulting from said work, and upon failure to do so, within 24 hours after having been notified by the Director of the Department of Public Works, the work may be done by city employees and the cost thereof charged to the permittee. The permittee shall also be liable for the cost thereof under the surety bond provided hereunder.
(1990 Code, § 4.19)