Pursuant to 40 CFR 51.102, the Department of Environmental Protection (DEP) announces a public hearing and opportunity to offer comments on a proposed revision to Florida’s State Implementation Plan (SIP) under the Clean Air Act. This SIP revision consists of a plan that will ensure the attainment and maintenance of the 2010 revised Sulfur Dioxide (SO2) National Ambient Air Quality Standard (NAAQS) in Polk County. Florida’s SIP amendment consists of specific conditions from two air construction permits for two facilities, Mosaic New Wales and Mosaic Bartow, as they pertain to emissions of SO2.