Sunol/Fremont – New Irvington Tunnel

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CALIFORNIA

Sunol/Fremont

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New Irvington Tunnel

Southland/Tutor Perini JV

Excavation on the 18,660 ft New Irvington Tunnel for the San Francisco Public Utilities Commission (SFPUC) is almost complete with less than 136 ft remaining to be mined between the Alameda West Portal heading and the Vargas Shaft East Heading.  Holethrough was anticipated for October 2013. The contractor is using conventional tunneling with two Antraquip roadheaders as well as controlled detonations to excavate the two headings.  Both headings have been challenging with high groundwater inflows and pressures, some squeezing ground areas and extensive pre-excavation grouting required.

A new portal structure has been completed at the Irvington Portal site located in the City of Fremont and site restoration work has commenced. The site is being reseeded and mulched before the oncoming winter rainy season.

After holethrough, the installation of the welded steel pipe fabricated by Northwest Pipe will commence on the remaining 14,600 ft of tunnel followed by annulus backfill grouting with low density cellular grout. Project completion is scheduled for mid-2015.

New Irvington Tunnel Project Team: Southland/Tutor Perini Project Manager: Robert Cornish; General Superintendent: Curtis Bahten; Tunnel Superintendents: Jim Mulkey and Jack Bowling; Hatch Mott MacDonald Construction Manager: Daniel McMaster; Lead QA Inspector: Rebecca Fusee; SFPUC Assistant Sunol Regional Project Manager: David Tsztoo, PE. Communications: Maria Le 866-973-1476 or email mle@sfwater.org

 

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