Friday, November 20, 2009

Night Work Nov 24-25, 30 and Dec 1st

As you know, the contractor has been making necessary adjustments to the tunnel boring machine (TBM) inside the shaft during weeknights. The TBM is now launched! On Nov 24-25, 30 and Dec 1st, limited crews will work until approximately 11pm. At this time, the contractor does not plan to work on Thursday or Friday. If the contractor continues to need more time to meet the project schedule, crews could work longer evenings in December.

During this night work, the majority of activities take place inside the shaft and tunnel. The crane and site lights may be used. The project team will follow all required nighttime noise limits as specified in the project Environmental Impact Report (EIR). Some soil may be lifted from the shaft but will not be relocated to the upper terrace until the following daytime shift.

We will continue to have on-call staff monitoring the situation. You may call our 24 hour dispatch 650-872-5900.


  1. Being one of the neighbors on the "frontline", I ask a question. What is with "Lake Polhemus" in the back yard? Why so much water that you are flooding the grounds? I can see keeping the dust down, though I have not experienced a dust problem from this project. The constant of running water and the flooding is just a little excessive, no.

  2. The contractor is required to implement dust control measures during construction, and one of the measures allowed is the use of sprinklers. We want to clarify that this dust control system is only using groundwater that is flowing into our shaft and tunnel excavations. It may seem excessive but it’s the water we have to deal from the site. Basically, we are only putting back into the ground what we are taking out.