Follow up in case anyone else needs it.
The S84 is an old referance from AREMA. The 2009 edition has it in it but not the newer edition, it was changed to a table 8 or table 9.
Also because I had the newer ASTM specs that had already been changed from S84 to the table that's why I coulnd't find it.
So be sure you are using the correct and latest editions of the specs and they should match up.
Why do I feel like I'm talking to myself?