New Irvington Water Tunnel - TunnelCast
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08 October, 2013: Final breakthrough completes 18,660ft (5.6km) of conventionally mined tunneling on the New Irvington Water Tunnel for the San Francisco Public Utilities Commission. Extensive groundwater inflows extended the excavation timeline by about 12 months and required more than 8.7 million pounds of pre-excavation grouting. The gassy ground classification also proved challenging. Contractor Southland/Tutor Perini now begins installation steel carrier pipe to complete the tunnel. Congratulations are owed to the work crews, engineers, designers, management and support staff on completion of the excavation.

Snapshot

New Irvington Water Tunnel

Paula Wallis reporting for TunnelCast
Location:
Sunol, California
Dimensions:
3.5 mile (5.6km) horseshoe shaped tunnel finished with a 8.5ft (2.5m) diameter steel carrier pipe.
Type:
Potable water supply
Owner:
San Francisco Public Utilities Commission
Contract Value:
$226,657,700
Roadheaders:
A Mitsui Miike 200AM
Two Antraquip 175
Contractor:
Southland/Tutor Perini JV
Designer:
URS
Subconsultant:
Jacobs Associates
Construction Management:
Hatch Mott MacDonald