Friday, August 22, 2014

Construction Advisory: New Irvington Tunnel Irvington Portal

We wanted to inform you of some very important construction activity affecting the neighborhood at the Irvington Portal site off Mission Boulevard. 

Irvington Portal work August 27 – September 15: 
As part of the process of preparing the tunnel to be brought into service, we will need to provide additional tunnel ventilation to our construction crews at the Irvington Portal site. The equipment will begin mobilizing in the area on August 27, 2014, and work should be complete by September 15, 2014. The ventilation equipment, which includes a fan and generator, will operate 24 hours a day. Cooling air is needed for crews who are lining the tunnel with a cement mortar to prepare it for being put into service. The sound barrier walls will keep the noise to a minimum and the contractor will install additional noise reduction measures.

Disinfection Process starting October 2014: 
Starting the first week of October, we will begin the disinfection process to bring the New Irvington Tunnel into service. In order to disinfect the tunnel, crews will need to stage generators and lights for the 24 hour a day filling/disinfection. The set up will occur during day light hours. The filling/disinfection process will take 2-4 days to complete once it begins. The expected night time activities should be limited to three nights.

What Happens Next?
The New Irvington Tunnel is anticipated to be in service delivering water sometime in November. The above ground work and restoration will continue into early 2015. These include final installations and burial of the new portal facilities, construction of a new security bunker at the existing tunnel portal (on top of the hill), and site restoration work, planting and fencing. The remaining sound walls will be removed after the entire site is restored.

Project Background
The New Irvington Tunnel Project is part of the $4.6 billion Water System Improvement Program (WSIP) to repair, replace, and upgrade our system’s aging pipelines, tunnels, and dams. The new 3.5 mile long tunnel will provide a seismically-designed connection between water supplies from the Sierra Nevada Mountains and the Alameda Watershed to Bay Area water distribution systems. Final construction is expected to be complete in 2015. 

Questions / Concerns?
We greatly appreciate your patience. Please call our 24-Hour Answer Line at 866-973-1476 or email or if you have any questions.
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