The permittee shall inform himself as to the existence and location of all underground utilities and protect the same against damage. The permittee shall not interfere with any existing utility without the written consent of the city and the owner of the utility. If it becomes necessary to relocate 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 and other facilities which may be in any way affected by the excavation work, and do everything necessary to support, sustain and protect them under, over, along or across said work. In case any of said pipes, conduits, poles, wires or apparatus or other facilities should be damaged, and for this purpose pipe coating or other encasement or devices are to be considered as part of a substructure, 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 bond shall be liable therefor. The permittee shall be responsible for any damages done to any public or private property by reason of the breaking of any water, sewer, or gas pipes and electric conduit or other utility and his bond shall be liable therefor. (1962 Code § 8-7-7)