While we do not anticipate significant levels of settlement, as a precaution, we are implementing a comprehensive program to monitor and mitigate any effects of tunneling. As the tunneling machine pushes forward through the earth, crews will measure the soil it removes while also tracking any ground movement above its path.
Buildings, utilities and streets located above and near the tunnel route will be monitored before, during and after construction. Each building will be surveyed prior to construction to document its interior and exterior condition. Monitors installed on the buildings by our crews will be checked against data from before construction, as well as data from monitors installed outside the monitoring area (pdf 2.9 Mb). If damage does occur to buildings, utilities or streets as a result of tunnel construction, we will be responsible for costs associated with repairs.