The permittee shall not interfere with any existing utility without the written consent of the City Engineer and the utility company or person owning the utility. If it becomes necessary to remove an existing utility this shall be done by its owner. No utility owned by the city shall be moved to accommodate the permittee unless the cost of such work be borne by the permittee. The cost of moving privately owned utilities shall be similarly borne by the permittee unless it makes other arrangements with the person owning the utility. The permittee shall support and protect by timbers or otherwise all pipes, conduits, poles, wires or other apparatus which may be in any way affected by the excavation work, and do everything necessary to support, sustain or protect them under, over, along or across said work, in case any of said pipes, conduits, poles, wires or apparatus should be damaged, they shall be repaired by the agency or person owning them and the expense of such repairs shall be charged to the permittee, and his or its bond shall be liable therefor. The permittee shall inform itself as to the existence and location of all underground utilities and protect the same against damage.
('69 Code, § 18-43)  Penalty, see § 10.99