Encinal High School Stadium ground improvement: seismic design lessons for engineers
Reviewed by Joe Ashwell

First reported on Geoengineer.org – News
30 Second Briefing
Keller has completed a ground improvement scheme for Encinal High School Stadium in Alameda, California, collaborating with the project geotechnical engineer to satisfy California Geological Survey seismic requirements. The solution, delivered as part of a larger stadium renovation, used ground improvement to mitigate liquefaction and lateral spreading risks identified in the site’s young bay mud and loose granular fills. For practitioners, the project shows how early contractor–engineer integration can tailor seismic ground improvement to school facilities on soft, seismically active coastal deposits.
Technical Brief
- Keller’s design-build role allowed iterative adjustment of treatment geometry as CGS review comments were resolved.
- Documentation for CGS compliance included as-built treatment records and geotechnical verification to support seismic safety certification.
Our Take
Keller’s repeat appearance in our geotechnical project coverage, including the Hamilton bus facility redesign noted in the 16 Nov 2025 item, suggests the firm is increasingly being brought in to deal with unforeseen or high-risk ground conditions rather than straightforward new-build work.
California’s seismic context and the involvement of the California Geological Survey at Encinal High School Stadium signal that similar public facilities in the state may face tighter scrutiny on liquefaction and fault-hazard mitigation, potentially driving more ground improvement scopes for contractors like Keller.
Within the 144 safety-tagged pieces in our database, very few focus on school or community sports infrastructure in the United States, so this California project stands out as an example of seismic risk management moving beyond critical infrastructure into everyday public-use venues.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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