NBC Bay Area. Sunol Water Project Trying to Head off Major Quake.

Calaveras Dam Replacement Project Construction Contract Awarded

The construction contract for Calaveras Dam Replacement project was awarded on May 24, 2011 to Dragados, USA/Sukut Construction, Inc./Flatiron West Inc. joint venture for approximately $259 million.

KTVU Video: New Irvington Tunnel Project Underway

Want to take an exclusive look at the New Irvington Tunnel? Check out KTVU Channel 2's sneak peak at the construction taking place to seismically upgrade the aging Hetch Hetchy Water System.

http://www.ktvu.com/video/27877116/index.html

Construction Moves Forward for Improvements at the Sunol Valley Water Treatment Plant

Construction is moving forward for the Sunol Valley Water Treatment Plant Expansion and Treated Water Reservoir Project. As of April 2011, construction for the overall project is 25 percent complete. Recently the contractor, Shimmick Construction Company, Inc., completed the extensive earthwork and soil nail wall required to build the new treated water reservoir, which included the removal of over 400,000 cubic yards of material. This work is part of various improvements that will enable the treatment plant to treat enough water to meet basic customer demands alone for up to 60 days after a major earthquake as well as improve water quality at the plant. All these improvements are expected to be completed in summer 2013.

Workers finish securing the soil nail wall, which will help stabilize the treated water reservoir. Photo courtesy of Robin Scheswohl.

The excavation work for the treated water reservoir included the removal of over 400,000 cubic yards of material. Photo courtesy of Robin Scheswohl.

Tunneling Begins

On Friday, March 11, the AQM 150-HR Roadheader began grinding its way west and has reached a distance of 25 feet. Tunneling will pause for approximately a week to complete the installation of the portal yard, ventilation and permanent power. Railroad tracks will also be installed behind the road header. The tracks are needed because as spoils generated they are collected on a conveyor belt and loaded onto rail cars for transport outside of the tunnel.

When tunneling resumes the roadheader will travel an average of 22 feet per day until it reaches the Vargas Shaft (14,300 feet away). A sister roadheader headed in the opposite direction will rendezvous with the machine sometime in 2013.

The roadheader’s boom-mounted cutting head that hacks away at rock face.

The boom-mounted cutting head is capable of excavating the 13-foot horseshoe shaped dimensions of the tunnel.

The Roadheader starts its journey from the Alameda West Portal

Spoils generated are collected on a conveyor belt attached to the roadheader and loaded onto rail cars for transport outside of the tunnel.

@ Work: Deeper at Vargas

The Vargas Shaft gets deeper everyday and will soon reach its final depth of 120 feet. Here are some photos of the shaft at various stages. Feel free to guess the depth of the shaft and post your answers in the comment section. Sign up for the blog and we will send you the answers.

February 22, 2011: __ feet

Both photos on March 4, 2011: ___ feet

March 10, 2011: __ feet

@ Work: Alameda West Portal

After months of working primarily above ground, construction workers are set to grind into the first inches of rock that make up the 3.5 mile New Irvington Tunnel. Here are some photos of crews @ Work on the eve of the first day of tunneling:

The AQM 150-HR Roadheader moves into position at the Alameda West Portal

Portal spiles are drilled to provide support for tunnel excavation.

Getting ready to knock on the door of the New Irvington Tunnel.