Construction of the tunnel access shaft continues.
Next year, the tunnel boring machine (TBM) will be lowered into the shaft and tunneling will begin.
In preparation for tunneling, three underground concrete "maintenance blocks" will be created along the tunnel alignment.
These maintenance blocks will be created by a drill rig injecting cement below ground to enable safe inspection and repair of the TBM's cutting head.
The first maintenance block, located on the east side of Harbor Regional Park adjacent to the 110 freeway, will be completed by the end of July.
Work on the second maintenance block, located on the southwest side of Harbor Regional Park, is expected to begin in August.
If you are holding virtual community meetings and would like us to provide an update, please email Glenn Acosta, Senior Engineer in our Public Information Office, at email@example.com
Additionally, if you are interested in us hosting an online construction update meeting, please email Mr. Acosta.