Perimeter Dikes at the Treasure Island Naval Station, U.S. Navy, Western Division, San Francisco Bay, CA. Project manager responsible for evaluating liquefaction potential, assessing seismic dike stability and deformation, estimating shaking-induced ground settlement, and assessing the performance of building foundations and underground utilities. Work included reviewing pre- and post-construction records and subsurface data; drilling, sampling, and logging exploratory borings; performing cone penetrometer testing; and mapping ground cracks. To mitigate future hazards, Geomatrix recommended stabilizing perimeter dikes, modifying foundation systems of structures, and raising ground elevations to prevent flooding. Based on feasibility evaluations of possible design schemes for dike stabilization, we identified three alternatives (stone columns, deep soil mixing, and rock berms) as being preferable and most cost-effective.