Treadwell & Rollo is providing geotechnical and environmental engineering services for the San Francisco Municipal Transportation Authority (SFMTA) Central Subway Project along with lead engineer and construction management firm, Parsons Brinckerhoff.
Drilling at Nob Hill for Central Subway Project.
We have begun the supplemental geotechnical and hydrogeologic investigations for the project’s final design/pre-construction phase by drilling a rock core boring on Nob Hill to assess the rock quality present in the tunnel alignment. Information from this boring will be used to assist in design of the Tunnel Boring Machine (TBM) cutterheads. The boring has to be drilled at an angle to avoid intercepting the Stockton Tunnel, which overlies the proposed tunnel alignment.
Supplemental investigations will also include borings and in situ and laboratory testing at each of the three proposed passenger station locations (Moscone, Union Square/Market Street, and Chinatown) and at several locations along the tunnel alignment, where new structural elements, including the TBM launchbox and several planned sumps, will be constructed.
Central Subway Alignment Map.
For geotechnical engineering services, Senior Engineer Cary Ronan, PE, GE, is the Project Manager and Principal Engineer Ramin Golesorkhi, PhD, PE, GE, is the Principal-in-Charge. Hydrogeologic modeling of groundwater flow around critical elements will be led by Principal Geologist Dorinda Shipman, PG, CHG, and Senior Project Scientist Michael Chendorain, REA.
The Central Subway Project is Phase 2 of the 1.7 mile Third Street Light Rail Project that will link Little Hollywood and Visitación Valley with South of Market, Moscone Center, Union Square and Chinatown. Benefits to the community will include improved regional connections to BART, Caltrain, and MUNI as well as reduced air and noise pollution and surface congestion. Service is expected to begin in 2018.
This is very cool. Do you have a larger version of the alignment map, so we can see more detail and read the small text?
Glad you like it. If you click on the image, it gets bigger. You can also visit the SFMTA website to see the original: http://www.sfmta.com/cms/mcsp/cspover.htm
Yes, I did look at the bigger one by clicking. The original appears to be the same size, unfortunately; it would be great to be able to zoom in for even more detail. Thanks!