Sec.  61.16   Base documents.

   (a) The Base Document is a complete tariff which incorporates all effective
   revisions, as of the last day of the preceding month. The Base Document
   should be submitted with a cover letter as specified in  Sec. 61.15(f) of this
   part and identified as the Monthly Updated Base Document. 

   (b)  Initially,  carriers that currently have tariffs on file with the
   commission must file a Base Document within five days of the initiation of
   mandatory electronic filing.

   (c) Subsequently, if there have been revisions that became effective up to
   and including the last day of the preceding month, a new Base Document must
   be submitted within the first five business days of the current month that
   will incorporate those revisions.