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Ted,

	Beware rules of thumb in relation to slab foundations for machinery.
There's actually a point (which varies from system to system) where the 
slab weight becomes small/large enough that it *amplifies* the motion it was 
supposed to damp.  

	Principles of Soil Dynamics (Braja Das, 1993) has a section on 
designing against vibration in machine foundations that's pretty good.
No code ref's spring immediately to mind, however.  

	

---------
Charles Hamilton, EIT				Phone:	714.824.8257 (office)
Graduate Student					714.856.2797 (home)
Department of Civil and 			FAX:	714.824.8694
Environmental Engineering			Email:	chamilto(--nospam--at)eng.uci.edu
University of California, Irvine