Sacramento Capital Branch Luncheon – August 26, 2014

Sacramento Capital Branch Luncheon – August 26, 2014
Event on 2014-08-26 11:30:00


Sacramento Capital Branch Luncheon

Tuesday, August 26, 2014, 11:30 AM to 1:00 PM***RSVP Deadline Thursday, August 21, 2014, 9 AM***Woodlak Hotel and Conference Center500 Leisure Lane, Sacramento, CA 95815 


Construction of the Double Bore Devil Slide Tunnel 

By Mr. Thomas Grey


The Devil’s Slide Projects was comprised of three major construction contracts and two mitigation projects. The purpose of the project is to construct two tunnels to bypass a portion of State Route 1, known as “Devils Slide”, which is subject to rockslides, slip outs, and road closures and which impact the coastal communities of Pacifica, Montara, El Granada, and Half-Moon Bay. These projects are 100% funded by the Federal Highway Administration’s Emergency Relief (ER) Program.

Thomas Grey will discuss the New Austrian Tunneling Method (NATM), otherwise known as the Sequential Excavation Method (SEM), that was used to excavate the two tunnels on Route 1. Some of the challenges included: excavating through constantly varying ground conditions; working 24 hours a day/ six days a week; verifying all the utility conduits were installed properly prior to final lining; and properly integrating all the tunnel systems into the Tunnel Control System software and hardware. Other challenges were wetlands, wildlife, plants, noise and visual impacts due to this construction. A context sensitive solution to the vexing problem of slides on this stretch of Route 1, hugging a coast that has unsurpassed scenic beauty, was found by constructing tunnels and a bridge spanning over an environmentally sensitive area.

Mr. Grey graduated from Gonzaga University with a Bachelor of Science in Civil Engineering in 1988. He has over 25 years experience working in the Office of Structure Construction Caltrans.  He is the Area Senior Bridge Construction Engineer for San Francisco and San Mateo Counties.  In addition to the Devil’s Slide Tunnels project, he has worked on numerous projects in San Francisco and San Mateo County.  Most notable projects are the demolition and reconstruction of the Central Freeway in San Francisco and seismic retrofit of the I-280 Southern Viaduct in San Francisco.  He was an oversight engineer on the San Francisco International Airport Ramp Construction projects in San Mateo County and the Bayshore Viaduct seismic retrofit and widening projects in San Francisco. Also, he has worked for the City of San Francisco, Muni Construction Department, in 1999 – 2000.His hobbies are running, playing tennis, and fly-fishing.

Community Outreach

Are you traveling for work or play? If so, join the Capital Branch in supporting a shelters for women and children escaping a violent environment, by collecting those little hotel toiletries that you find in your hotel room. The Capital Branch will collect them at its meetings and deliver them to the shelter. Spread the word in your work place to all who travel. Together, we can make a difference in the lives of battered women and children. Please collect unused soaps, shampoo and lotions, shower caps, etc. Thank you on behalf of the shelters and the women and children who you will be helping.


*Networking begins at 11:30 AM.  Lunched served at 12 noon.

  Menu:  TBD  Veggie option:  TBD

*All Entrees include salad, seasonal vegetables, rolls & butter, dessert, Starbucks coffee, Decaf coffee, Hot & Iced Tea

Event Contacts:  Ajay Sehgal 650.580.1221 (cell) or Darren Mack 916.521-0669 (cell)

Join us on LinkedIn. The Capital Branch has started a Group Page to make it easier to post announcements about upcoming events of interest to Civil Engineers in the Sacramento area. To join the group page go to


at Woodlake Hotel Grove Amphitheater
500 Leisure Lane
Sacramento, United States

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