Liquefaction is a process by which seismic shaking induces excess pore water pressure in loose, poorly-graded sands that are below the water table, causing them to behave as a liquid. The effects of liquefaction can range from surficial sand boils to large ground surface settlements, to lateral spreading of embankments. Each of our comprehensive preliminary geotechnical reports provide a limited discussion of the liquefaction potential of the on-site soils. Where initial research or drilling indicates a significant potential for liquefiable soils, we can perform a more detailed liquefaction evaluation. This evaluation will determine the extent of the liquefiable materials, estimate the magnitude of total and differential settlements which could occur, and recommend measures to mitigate these settlements. We have performed liquefaction analyses for a number of sites throughout California. These evaluations are performed in accordance with California Division of Mines and Geology Special Publication No. 117, Guidelines for Evaluating and Mitigating Seismic Hazards in California.