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Steel Column Base Plates

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     During the erection of steel columns, the contractor needs some means 
     of leveling the base plates and plumbing the columns.  Two common 
     choices are 1) steel plates or shims between the foundation and base 
     plate and 2) leveling nuts beneath the base plate.  In both cases 
     grout is placed between the foundation and base plate after the 
     columns are plumbed.  I am interested in current practices for 
     commercial buildings.
     
     What are the advantages and disadvantages of each leveling/plumbing  
     method in high seismic zones?
     
     Do you normally specify a method or leave it up to the preference of 
     the contractor?
     
     Do you normally specify "drypack" grout or nonshrink grout, or do you 
     leave it up to the preference of the contractor?
     
     Thanks,
     
     Rick Drake, SE
     Fluor Daniel, Irvine