Crews from the Southland Tutor Perini JV met underground recently at the completion of one of four tunnel headings that comprise the New Irvington Tunnel project, a 3.5-mi component of San Francisco Public Utilities Commission’s $4.6 billion Water System Improvement Program (WSIP) to repair, replace, and seismically upgrade the Hetch Hetchy Water System’s aging pipelines, reservoirs and dams.
WSIP includes more than 80 projects spanning seven counties from the Called a “hole-through” in tunneling terminology, the road header teams from the Irvington Portal in Fremont and the Vargas Shaft 4,500 ft away shook hands somewhere under the mountainside and formally completed this section of tunnel excavation.