SR-99 Tunnel - Glumac Building Commissioning


Great Projects

Commissioning a Mega-Project: Seattle’s SR-99 Tunnel Replacement

Fire suppression system? Check

Lane control signage? Check.

Traffic detection? Check.

From a deluge system capable of pouring as much as 17 inches of water per square foot, to the 300 cameras monitoring traffic, Seattle’s SR 99 tunnel might be one of the safest, most well-monitored spaces in the city. Traffic now passing below downtown is doing so in a tunnel designed to withstand a 9.0 earthquake and within seconds can alert drivers to anything from a multi-car pile up to a bucket that’s flown off the back of a truck.

But you don’t design and construct a mega-project like this and simply open it to more than 100,000 vehicles overnight. While ushering drivers from Point A to Point B (in this case, CenturyLink Field to the Space Needle) is any roadway’s primary objective, making that trip simple and seamless requires hundreds of MEP, lighting, low voltage, security, and digital safety systems – both inside and outside the tunnel – that each need to be inspected and tested. And tested. And tested again.

SR-99 Tunnel - Glumac Building Commissioning
The SR-99 Tunnel in construction. Credit WSDOT

Glumac’s Seattle Commissioning Group, led by Angela Templin, performed functional testing for both the tunnel itself, and the operations buildings at each end. Beyond basic functionality, this type of project requires considering and testing multiple scenarios and iterations, to conclude as closely as possible the automated tunnel systems and the WSODT Operations staff are prepared to manage any problem that may arise when opened to the public.

“In sum, prior to the new tunnel receiving its first commuter earlier this year, commissioning agents need to test more than 100 individual systems and verify they are working both individually and together.”

Testing starts with every sub-system, then branches out from there to verify each system functions properly in conjunction with others. This means, for example, beginning by checking the drainage system to see if it’s pumping water where it needs to go. Then moving on to fire suppression – checking each of the 208 deluge values individually (both on the north and southbound side) to make sure they’re providing proper coverage throughout the tunnel. And because they had previously verified the pumps, the deluge water is now pumped out of the tunnel, preventing flooding. Then they verify lighting systems perform as intended for each emergency scenario (while also verifying lighting in the opposite direction of the tunnel maintains its normal, non-emergency operation). Then the PA systems are tested. Once all systems are tested individually, an emergency is simulated to see if each system functions seamlessly together to suppress a possible fire, alert drivers of the emergency, and give proper instructions and direction for escape if needed. In sum, prior to the new tunnel receiving its first commuter earlier this year, more than 100 individual systems needed to be tested and verified to be working both individually and together.

Commissioning in the cloud with CX Alloy

And all this is done with the daunting timeline of an incredibly visible project that causes intermittent freeway closures leading up to its completion and has a large, publicly-financed price tag attached.

The team needed a way to work fast, communicate easily, and to know the status of the ongoing testing. Historically, all the documentation on a commissioning project is managed and maintained within a project binder that contains all the documentation for every system. On a mega-project like this, the scale and number of systems make printing out and compiling massive binders of documentation nearly impossible – particularly when considering printing and materials cost as well as the physical space required. The time required for set up and ensuing back and forth communication between the Cx team, the contractor, and the owner risks setting the project back weeks, if not longer.

For more details on our scope of commissioning on the SR-99 Tunnel project, head over to our project portfolio at

“On a massive scale you’re going from having a couple thousand pieces of equipment,” says Templin. “And a lot of systems in the tunnel come down to life safety. So, it’s critical to have that latest version of the documentation in one place accessible at any time by the entire team. The traditional paper binder would have significantly hampered the entire process.”

To accomplish that, the team worked together in cloud via Bluebeam and Cx Alloy. These tools allowed the entire team to work from the same information, mitigate rework, and built trust among the group, which is critical when so many systems boil down to life safety. What’s more, it provided greater efficiencies and ultimately sped up completion of the testing.

“Working in the cloud document repository allows the entire team to access that documentation in real time from anywhere,” Templin says. “Understanding the scale of this project, we pushed to collect a lot of documentation early on that we’d normally gather at the end of the project – testing documents, startup reports – all typically done as a close out. Because they were part of a pre-functional checklist, now that we’re near the end, 99-percent of those documents are where they need to be.”

Through this coordination-intensive project, the Glumac commissioning team has learned many lessons about the effective management of commissioning documentation, collaboration, and information sharing, and played a valuable role in verifying that one of the most high-tech tunnels in North America operates properly. Our team is always looking to leverage these lessons on our projects from a 16,000-square-foot community center up to the new North Satellite Terminal at Sea-Tac International Airport. Learn more about our building commissioning experience at