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CISGeotechnical: I am a project engineer with a Bay Area geotechnical consulting firm working on several projects located on the margin of San Francisco Bay that are underlain by younger Bay Muds or localized pockets of peat that would appear to qualify as S-F soils per the UBC criteria. I...

Thanks for the tips! However, I am still unclear what is required by the UBC to perform a "site-specific evaluation" and "dynamic site response analysis" if S-F soils are determined to exist at the site.

Coneboy; The UBC has six soil profile types designated SA through SF which are used with the seismic zone factor, Z and distance to known seismic source to determine the UBC Seismic Coefficients Ca and Cv, and Near Source Factors Na and Nv. Seismic coefficients for soil profile types SA...

Would San Francisco baymuds (OL/OH by USCS) be considered Class S-F Soil Profile Type per the UBC due to their organic content? If so, how do you provide a "site-specific evaluation". I am looking at a site with a bay mud thicknesses of less than 50 feet which are soft, highly...

Driven H-piles or precast (and likely prestressed) concrete piles are probably your best bet. Cast in place piles would be difficult to construct due to the caving of the silty sand, and shallow water table. You need to have a good idea of the depth to bedrock for end-bearing piles, and will...