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seismic - site classification

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Title: seismic - site classification

When determining the appropriate site classification, is the type of foundation system considered or important.  Table 1615.1.1 (IBC 2000) is used for the average properties of the top 100 ft.  What happens if the foundation system is piles (end bearing) which extend down to 75ft.  At that elevation, the average soil properties are quite different.  Any thoughts.

Brian Stanley, P.E.
Baltimore, Md