Modern facility means a man-made structure or infrastructure that is less than 50 years old. It is assumed that roadways and their select materials are all modern facilities for the purposes of this Agreement. No Historic Properties Affected means a finding that either there are no historic properties present or there are historic properties present but the undertaking will have no effect upon them as defined in 36 CFR 800.16(i). No Potential to Cause Effects means a finding that the undertaking is a type of activity that does not have the potential to cause effects on historic properties, assuming such historic properties were present. Reconstruction means to rebuild an existing roadway system and its appurtenances with new materials in order to improve the function and condition of the system. Reconstruction may or may not require modifications to the size and configuration of the existing system. Rehabilitation means structural enhancements with new materials in order to extend the service life of an existing roadway system and its appurtenances. Replacement means substitution of a new structure for an existing structure, which may require a change in size, dimension, location, and configuration, in order to improve the function and condition of a roadway system.