San Francisco, California

Malcolm was selected by Swinerton Builders to provide a shoring, dewatering, and ground improvement package for the 505 Brannan project site, located just three blocks from the Giants Baseball Park. The single-point, deep soil mixed shoring wall was installed to depths up to 42 feet, extending into the Franciscan Rock formation. Currently, tie-backs are being installed around the perimeter to allow the site to be excavated to the final subgrade, 24 feet below street level. At the bottom of the excavation, 7-foot diameter deep soil mixed columns will be installed on a 9 x 9 feet grid to mitigate settlement of the mat slab. The tight project site, loose dune sand, adjacent building protection, and buried wooden piles are just a few of the challenges our Northern California crews are working through as the project remains on schedule.