Representative Projects: Municipal :

City of Concord Parking Structure, Concord, CA – The parking garage consists of a three-level parking: two above-grade parking levels plus at-grade parking.  Subsurface conditions included fill, alluvial deposits, bedrock, and volcanic ash.  The primary geotechnical concerns for the project are the presence of expansive soil, potential variability of the ash deposit, settlement, and the possible presence of remnant subsurface structures and/or foundations. The design included removal of the ash from below foundations and placing two feet of aggregate base below the footings to help spread the loads and reduce settlement of the foundations and columns.  During construction, the contractor uncovered and removed some concentrated piles of trash that dated back to the early to mid-1900’s.