There is a lot of activity as construction moves forward in Union Square. At the corner of Geary and Stockton, a small portion of the Union Square Garage is being demolished to allow for the construction of the north entrance to the Union Square. The entrance will open to the sidewalk of Geary and Stockton.
Construction on the roof of the north concourse is ongoing. The work is being done in sections on Stockton near Maiden Lane and Geary. Workers have excavated soil to the roof level, installed steel beams and corrugated steel sheets, and poured concrete.
Work on the south concourse to the Union Square | Market Street station is also underway. At the intersection of Ellis and Stockton, crews are removing soil and reconstructing the currently closed Ellis Street entrance to Powell/BART/Muni station to also accommodate the Union Square | Market Street Station.
Throughout the construction area, drilling and compensation grouting are being performed. In compensation grouting, a concrete-like solution is injected under pressure into a pre-drilled hole. This helps to harden and stabilize the soil under surrounding buildings and structures.
All of the work has a great benefit. Not only will the Union Square | Market Street Station give residents and tourists easy access to Union Square, it will also have a walk way connecting passengers easily to other Muni lines and BART.
Here are some photos of the construction: