``Utah State Plan for Implementation of Emission Controls for Existing Designated Facilities, Section I. Municipal Solid Waste Landfills'' and the associated State regulations in R307- 20-2 and R307-21 of the Utah Air Conservation Regulations, submitted by the State on April 2, 1997 with amendments to the plan submitted on October 31, 1997. [63 FR 2156, Jan. 14, 1998]