Sacramento embedded liner

Oct 2009: The Upper Northwest Interceptor 1&2 Project (UNWI 1&2) is the first segmental tunneling project in the world to use a PVC corrosion-protection liner embedded in the tunnel segments. Traylor/Shea JV is 14,500 feet into its 3.6 mile drive with 4,664 feet to go before breakthrough into the UNWI 2/3 Transition Structure reception shaft.

Snapshot

First use of embedded line in tunnel segments

Paula Wallis reports for TunnelTalk

Location:

Sacramento, CA USA

Project:

Upper Northwest Interceptor 1&2
(UNWI 1&2)

Tunnel:

3.6 mile x 12ft i.d. diameter
(5.75km x 3.6m)

Contract Value:

$97.3 million

Owner:

Sacramento Regional County
Sanitation District

Contractor:

Traylor/Shea JV

Construction Manager:

Hatch Mott MacDonald

Designer:

URS

TBM:

EPB supplied by The Robbins Company

Completion Date:

Tunneling activities began on January 14, 2009. Excavation was completed November 18, 2009. Project completion is expected in November 2010.