For control periods beginning before January 1, 1994, refiners, importers, and blenders that intend to use oxygenates other than single-carbon through four-carbon alcohols or methyl tertiary butyl ether to comply with control period oxygen requirements shall register their intent with the Bureau and the Department at least 30 days before the beginning of each control period.
Md. Code Regs. 03.03.06.04