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Reducing Sulfur Dioxide Readings in the Riverview – Gibsonton Area

EPC Board Meeting June 20, 2013. Reducing Sulfur Dioxide Readings in the Riverview – Gibsonton Area. Purpose. Advise the Board regarding sulfur dioxide concentrations in the Riverview – Gibsonton Area Spell out proposed measures to ensure reduced concentrations

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Reducing Sulfur Dioxide Readings in the Riverview – Gibsonton Area

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  1. EPC Board Meeting June 20, 2013 Reducing Sulfur Dioxide Readingsinthe Riverview – Gibsonton Area

  2. Purpose Advise the Board regarding sulfur dioxide concentrations in the Riverview – Gibsonton Area Spell out proposed measures to ensure reduced concentrations Alert everyone to a pending EPA action declaring the area to be non-attainment

  3. Background • US EPA sets health-based standards for outside air (criteria pollutants) • EPC monitors for those pollutants and reports the same to the public Six Criteria Pollutants Ozone, Fine Particulate, Nitrogen Oxides, Lead, Carbon Monoxide and Sulfur Dioxide

  4. New Sulfur Dioxide Standard • Sulfur Dioxide (SO2) – colorless, odorless gas which at higher concentrations is a respiratory irritant • EPA set a new limit for SO2 effective January 2011 which limits one-hour concentrations. • Standard was tightened from 140 PPB averaged over 24 hours to just 75 PPB for one hour.

  5. SO2 Monitoring Sites in Hillsborough County and their Design Values Sidney - 13 Davis Island - 43 East Bay - 105 Simmons - 21

  6. East Bay Monitoring Site

  7. Proposed Redesignation byState and EPC Mosaic

  8. Current Status Mosaic continues to be in compliance with their State air pollution permits and all the associated emission limits. Mosaic has taken initial steps to reduce emissions from their plant, but EPC’s monitor still periodically records readings above the standard. Working in close coordination with the State and EPC, Mosaic must take steps to further reduce their downwind impact.

  9. Jeff Stewart Mosaic Riverview Environmental Manager

  10. Agency-Industry Cooperation • Cooperative approach to minimizing the Non-Attainment Designation • EPC, FDEP, and Mosaic began working together in 2011 to address the up-coming standard • Area designation based in historic precedent if the primary source is willing to accept • Developed mutually agreeable plan for Non-Attainment Designation submittal to EPA which should minimize the extent of the non-attainment area

  11. Phosphate Concentrate Plant

  12. Mosaic’s Plan of Action • Looked at simply limiting publicly accessible areas and the acid plant’s stack characteristics (exit velocity and temperature) • Cleaned up fugitive gas leaks and revised operational protocols reducing concentrations immediately • Reviewing process design changes necessary to lower SO2 emissions through improved conversion efficiency, e.g., bed temperatures and catalyst, and increases in acid plant stack height • Ultimately are ensuring compliance by EPA’s deadline

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