The two buildings assessed were a three-story reinforced concrete and wood-framed structure and a three-story reinforced concrete parking garage. Both buildings are founded on 24-inch diameter drilled concrete piles that derive support from the stiff to hard alluvium below the surficial fill and softer soils. Upper granular fill soils were found to be potentially liquefiable during strong earthquake shaking, exposing the building to potential performance issues related to liquefaction-induced reconsolidation settlement.

Rockridge Geotechnical (RG) assessed the potential for geologic hazards, including the potential for liquefaction. With a well-defined understanding of the geologic hazards, the existing pile capacities for axial, uplift, and lateral resistance, including the effects of pile groups, were assessed. Rockridge Geotechnical recommended new micropiles where required to provide additional uplift capacity.