Mason Street Hotel Building

DAC was the geotechnical engineer for the project. The project consisted of adding 4 additional stories to an existing 8-story hotel structure in down town San Francisco. The structure also had a one level basement with maximum headroom clearance of about 10 feet. Due to limited access, a drill rig could not be used to perform our exploratory work. Our subsurface exploration was, therefore, limited to hand dug test pits within the crawl space area. Several test pits were excavated to determine the subgrade conditions and depth of the existing footings. Based on our observation of soil profile in the relatively shallow test pits, we prepared the required recommendations for the major addition as well as structural improvement of the hotel building as planned.