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SUBCHAPTER 19

SUBCHAPTER 19. SC 19 Study. Where do numbers come from? Re-evaluate the basis of the numbers How would you come up with the numbers today?. Today’s Presentation. How would you come up with the numbers today? Summary of study Recommendations. How would you come up with the numbers today?.

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SUBCHAPTER 19

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  1. SUBCHAPTER 19

  2. SC 19 Study Where do numbers come from? Re-evaluate the basis of the numbers How would you come up with the numbers today?

  3. Today’s Presentation • How would you come up with the numbers today? • Summary of study • Recommendations

  4. How would you come up with the numbers today? • Appendix C • Use most stringent rule from EPA R6 and CenSARA states • Kansas, Missouri, and New Mexico – same as Oklahoma • Use existing information gathered from recent stack tests • Reduce current algorithm by 37.5%

  5. How would you come up with the numbers today? • Appendix G - Adopt the most commonly used standard of nearby, similar states Okla., LA, Kan., Missouri, Iowa, Neb.

  6. How would you come up with the numbers today? • Appendix G Use most stringent algorithm in EPA R6 and CenSARA states • Existing units use current Oklahoma algorithm • E = 4.10P0.67 P ≤ 30 TPH • E = 55P0.11 – 40 P > 30 TPH • New units use : • E = 3.59P0.62 (E = 4.10P0.67) P ≤ 30 TPH • E = 17.31P0.16 (E = 55P0.11 – 40) P > 30 TPH

  7. Summary • Does present rule include condensables and should it? • Historical research determines – yes • All EPA R6 and CenSARA states rules include condensables • EPA approved original SIP on the basis of full train • NSR calculations for permitting and emission inventory require total PM • If algorithms were created today, they would be full train

  8. Recommendation Options • Relax the rule Must justify relaxation to EPA and the public Existing units meet the current rule 2007 PM2.5 monitoring results show potential problem Recent modeling results for NSR indicate potential PM increment problem in Oklahoma

  9. Recommendation Options • Adopt a more stringent rule • Appendix C • Okla. has the most stringent rule in EPA R6 and CenSARA • Stack tests results could justify a 37.5% reduction in allowables • Appendix G • Okla. has the most commonly used algorithm • Okla. could adopt more stringent rule for new units (Minnesota Rule) • PM2.5 data suggest future potential problems

  10. Recommendation Options • Do not change the rule • Okla. has the most stringent rule in EPA R6 and CenSARA for indirect fired units • Okla. has most common algorithm in R6 and CenSARA for direct fired units • Vast majority of existing units comply with current rule • Future units will be more likely to meet SC 19 than existing units

  11. Recommendation • Clarify that existing SC 19 algorithms include full train PM • Do not change existing rule until and unless future data identifies a PM problem that can be addressed by altering SC 19.

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