Where more than one process of producing effervescent wine is used, the appropriate TTB officer may require the portion of the premises used for the production and storage of wine made by each process (bottle fermenting, bulk fermenting, or injecting carbon dioxide) to be segregated as provided by §24.27.
27 C.F.R. §24.191
Sec. 201, Pub. L. 85-859, 72 Stat. 1381, as amended (26 U.S.C. 5365 )