Cut-and-Cover Method
The contractor will be permitted to use the cut-and-cover method for construction of portions of the tunnel
around the portals or in areas with shallow covering. If he elects to use this method, he shall submit plans
covering all phases of the work to be done or affected by this method to the engineer for approval before
proceeding with the work. The contractor shall restore all property, slopes and ground surfaces to finished lines
and grades. Slopes and surfaces shall be restored and maintained by depositing, spreading and compacting
material in conformance with the provisions of Part 1, Roadbed, except that material adjacent to the tunnel
walls shall be free draining and placed in horizontal layers not exceeding 12 inches in thickness. At no time will
the fill on one side of the tunnel exceed that on the other by more than 4 feet in height. Heavy equipment shall
not be permitted on top of the tunnel until the fill has reached a height of 12 feet over the top of the arch, or as
directed by the engineer.