State Plan Actions
On Public Notice
Missouri State Implementation Plan Revision –Nonattainment Area Plan for the 2010 1-Hour Sulfur Dioxide National Ambient Air Quality Standard – Jackson County Sulfur Dioxide Nonattainment Area
The main purpose of this SIP revision is to address Clean Air Act Amendments of 1990 (CAAA) section 172(c) and section 191(a) plan requirements as applicable to the Jackson County 2010 1-Hour Sulfur Dioxide (SO2) Nonattainment Area (NAA). The plan’s main control strategy includes the reduction of SO2 emissions by 95 percent from the largest source in the NAA. The plan also relies on SO2 emission limits for several other large sources in the area through federal regulation or state rulemaking. All emission limitations necessary for demonstrating compliance will be enforceable through the proposed Missouri SO2 rulemaking, 10 CSR 10-6.261, Control of Sulfur Dioxide Emissions.
A public hearing is scheduled for this plan action on June 25, 2015. Comments about this plan action will be accepted throught the close of business on July 2, 2015.
Proposed for Adoption
Nonattainment Area Plan for the 2010 1-Hour Sulfur Dioxide National Ambient Air Quality Standard – Jefferson County Sulfur Dioxide Nonattainment Area
The main purpose of this state implementation plan (SIP) revision is to address Clean Air Act Amendments of 1990 (CAAA) section 172(c) and section 191(a) plan requirements as applicable to the Jefferson County 2010 1-Hour Sulfur Dioxide (SO2) Nonattainment Area (NAA). The plan’s main control strategy is the permanent shutdown of operations at the Doe Run Herculaneum primary lead smelter in December 2013, as required by federal consent decree. The plan also relies on new SO2 emission limits for the Rush Island, Labadie and Meramec Energy Centers, which will be enforceable through a 2015 Consent Agreement between the Missouri Department of Natural Resources and Ameren Missouri. The 2015 Consent Agreement also includes provisions for Ameren Missouri to install and operate ambient SO2 monitors and meteorological stations around its Rush Island plant.
This SIP revision also addresses CAAA required elements, including a reasonably available control measures (RACM) analysis, a reasonably available control technology (RACT) analysis, reasonable further progress (RFP) requirements and contingency requirements. Multiple air dispersion modeling scenarios were evaluated in the determination that the area will demonstrate compliance with the 2010 1-Hour SO2 National Ambient Air Quality Standard no later than Oct. 4, 2018.
A public hearing was held for this plan action on April 30, 2015. Comments about this plan action were accepted through the close of business on May 7, 2015. Revisions to the plan have been made as a result of comments received. The revised plan and appendices are listed below along with a summary of the comments received ant the corresponding responses from the Department.
The modeling performed in support of the Jefferson County Nonattainment Plan takes into account federally enforceable SO2 emission reductions from the closure of the Doe Run Herculaneum primary lead smelter. The closure of the smelter was required by the consent decree between Doe Run, the department and the U.S. Environmental Protection Agency filed in the United States District Court in the Eastern District of Missouri, Case No. 4:10-cv-01895-JCH, and entered on Dec. 21, 2011. We are providing a link to this document for reference: http://www.epa.gov/region7/cleanup/doe_run/pdf/consent_decree.pdf