It is intent of this emergency repairs contract, at all locations and areas ordered under this contract as determined by the New York City Department of Environmental Protection and as directed by the Engineer to reconstruct sections of existing collapsed or otherwise defective Storm, Sanitary or Combined Sewers in roadways, sidewalks, malls, medians, pedestrian ways, easements or other nonroadway areas including the reconnection of all existing house sewers, basin connections, and the construction of new manholes as required. The sections of existing collapsed or otherwise defective Storm, Sanitary or Combined Sewers must be removed and reconstructed with Extra Strength Vitrified Clay Pipe on Concrete Cradle and/or Precast Reinforced Concrete Pipe on Concrete Cradle, complete, as shown, specified or required. The Contractor, when so ordered by the Engineer, will be required to substitute the use of Ductile Iron Pipe on Stone Bedding in lieu of Extra-Strength Vitrified Clay Pipe on Concrete Cradle for the various sized pipes indicated in the Bid Schedule. The Ductile Iron Pipe must meet all of the requirements, standards and specifications of the Department of Environmental Protection.