Utility Protection While Tunneling in an Urban Environment for the DC Clean Rivers Project

摘要

The District of Colombia Water and Sewer Authority is implementing the $2.6 billion Clean Rivers Project (DCCR) to control combined sewer overflows to the Anacostia and Potomac rivers. Currently, DC Water is designing and constructing the First Street Tunnel (FST), the third of four soft ground storage and conveyance tunnels being built as part of DCCR. The FST is located in an urban setting, beneath several of DC Water's water and sewer service lines. This paper addresses the technical and contractual measures taken by DC Water to protect its utilities that are within the influence zone of the FST tunneling operations.