EPAs Proposed Revision of the SO 2 NAAQS & AQDs Subchapter 31 – Control of Emissions of Sulfur Presentation to the Air Quality Advisory Council January 20, 2010

Subchapter 31 Control of Emissions of Sulfur OSDH Rule First Effective in July 1972 – Ambient SO X /SO 2 Standards for Existing Facilities Current Subsection (a) Also Applies to Petroleum & Natural Gas Processing Facilities Built After December 1974 – SO 2 Emissions Limits for Certain New Facilities/Equipment Fuel-burning equipment Sulfur Recovery Plants Nonferrous Smelters Paper Pulp Mills – SO 2 and Sulfuric Acid Mist Emissions Limits for New Sulfuric Acid Plants

Last Proposal Clarify Language Require New & Existing Sources to Meet the Same Requirements – Subsection (a) – Suggested Dropping 5-minute Standard Add Alternative Fuels Definition and Requirements

EPAs Proposed SO 2 NAAQS Revision Published on December 8, 2009 – 74 FR Moves Focus to Minimizing Exposure to High Short-Term Concentrations Info at: –

EPAs Proposed SO 2 NAAQS Revision Primary Standard Only – Effects on Human Health Separate Review for Secondary Standard – Due by 2012 – Effects on Welfare – Deposition of SO 2 & NO X High SO 2 => High SO X (PM 2.5 Precursor)

Standard: Current vs. Proposed Current SO 2 NAAQS: – 24-hour 140 ppb – Annual 30 ppb Proposed SO 2 NAAQS : – 1-hour 50 – 100 ppb Revoke Both the Current 24-hour& Annual Standards

SO 2 : Current vs. Proposed NAAQS vs. SC31 Current Standards (App. E & F) EPAs Proposed Revision (74 FR 4810, 12/8/09) SC 31 Requirements PrimarySecondaryPrimaryAlternative Primary (252: ) 5-Minute500 ppb 1-Hour50 – 100 ppb150 ppb460 ppb 3-Hour500 ppb250 ppb 24-Hour140 ppbDelete 140 ppb (Retain) 50 ppb Annual30 ppbDelete 30 ppb

Attainment: Current vs. Proposed Current: – Oklahoma is in Attainment for Current Standards Proposed (EPA Projection): – Tulsa & Muskogee Counties would be Non- Attainment at 50 ppb Level

Final Rule Issued by June 2, 2010 Comment Period Closes February 8, 2010

Proposed SO 2 Monitoring All Monitoring Sites – Source-Oriented – Measure Maximum Ground-Level Concentrations 348 Sites Planned Nationally – 231 – Core Based Statistical Areas Based on Population & SO 2 Emissions – 117 – States Contribution to National Emissions State Determines Locations – Operational by January 1, 2013

Current SO 2 Monitoring 448 Current Active Monitoring Sites Nationally – 1/3 (~163) Sited Correctly – ~185 New (or Relocated?)

SO 2 Monitoring in Oklahoma 7 Current SO 2 Monitoring Sites – Most are Source-based EPA Proposal Would Require: – One State-Level Emission-Triggered Monitor – Two Population-Oriented Monitors Tulsa AQD Would Review Monitor Locations

Implementation Timeline MilestoneDate Signature – Final RuleJune 2, 2010 State Designation Recommendations to EPAJune 2011 Final DesignationsJune 2012 SIPs DueWinter 2014 Attainment DateSummer 2017