The ranges in Table 4.1.8.4.-B are retained from the 2012 Building Code. Where required for the application of a standard referenced in Subsection 4.1.8., the Site Class for a particular site designation Xv can be determined from Table 4.1.8.4.-B on the basis of the value of. Further information on Site Class can be found in the Commentary entitled “Design for Seismic Effects” in the “Structural Commentaries (User’s Guide – NBC 2020: Part 4 of Division B)”.