Ground Improvement at 24th & Harrison

24^th and Harrison is a residential mixed-use project that developed a new identity. In the heart of Oakland’s Broadway Auto Row, named for the main thoroughfare’s history of car dealerships and automotive services dating back to 1912.

Malcolm Drilling performed Ground Improvement services for a project that included a 20-story mixed use building and a 2-story below grade 500-car parking garage. The excavation depth was 20-feet below grade and the site surrounded by existing structures and city streets. To safely achieve this depth, Malcolm designed a 24,000 square feet of temporary shoring system comprised of cantilever soldier piles and tiebacks and secant piles with internal rakers. The 20-story structure resulted in significantly high bearing pressure loads which the current soil could not support. As a result, a ground improvement system was created under the mat foundation to withstand the load demand with minimal settlement. The ground improvement included over 2,300 rigid inclusions installed to depths of 40-feet.