GovDelivery logo

On Public Notice | Proposed for Adoption

On Public Notice

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 (department) 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 October 4, 2018.

Jefferson County SO2 Nonattainment Area Plan

Appendices A thru J

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 December 21, 2011. We are providing a link to this document for reference:

Submit Comments Now

A public hearing is scheduled for this plan action on April 30, 2015. Comments about this plan action will be accepted through the close of business on May 7, 2015.

Proposed for Adoption

None at this time.