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TCEQ Air Permits Division

Justin Cherry, P.E. Ahmed Omar. TCEQ Air Permits Division. Outline. TCEQ Air Permits Division Air Dispersion Modeling Team Modeling Overview AERMOD Examples Questions?. What is the TCEQ?. The Texas Commission on Environmental Quality strives to protect our state's human

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TCEQ Air Permits Division

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  1. Justin Cherry, P.E. Ahmed Omar TCEQ Air Permits Division

  2. Outline • TCEQ • Air Permits Division • Air Dispersion Modeling Team • Modeling Overview • AERMOD • Examples • Questions?

  3. What is the TCEQ? The Texas Commission on Environmental Quality strives to protect our state's human and natural resources consistent with sustainable economic development. Our goal is clean air, clean water, and the safe management of waste.

  4. Air Permits Division Any person who plans to construct any new facility or engage in the modification of any existing facility which emits air contaminants into the atmosphere shall obtain a permit pursuant to Title 30 Texas Administrative Code (30 TAC) § 116.111.

  5. Air Permits Division • New Source Review (NSR) program • Two main goals: • Clean up dirty areas • Keep clean areas clean

  6. What do we permit?

  7. Air Permits Division • Technical Review... • Identify emission sources • Confirm emissions calculations • Determine Best Available Control Technology • Determine applicability of state/federal rules and regulations • Analyze off-property health impacts

  8. Air Dispersion Modeling Team • Provide guidance • TCEQ Permit Reviewers • Air Permit Applicants • Consulting Firms • Review modeling demonstrations • Conduct modeling for small businesses/permit resolution

  9. Modeling Overview • Why model? • To assess impacts from new or modified sources • Requirement to conduct modeling is contained in: • 30 TAC Chapter 116 • 40 CFR Parts 51, 52, 266 • Cost-effective tool to estimate impacts • Ambient monitoring is expensive

  10. Modeling Overview • Modeling for regulatory purposes • Federal Review/PSD • NAAQS • CO, Pb, NO2, O3, PM10, PM2.5, and SO2 • Increment • SO2, NO2, PM10, and PM2.5

  11. Modeling Overview • Modeling for regulatory purposes (continued) • State Review • Property Line Standards • SO2, H2S, and H2SO4 • NAAQS • CO, Pb, NO2, O3, PM10, PM2.5, and SO2 • Effects Review • Non-criteria pollutants • Examples: formaldehyde, ammonia, and benzene

  12. Modeling Overview • Emission Event Modeling • Accidental releases • Unplanned events • Upsets • State Implemention Plan (SIP) Modeling • An enforceable plan developed at the state level that explains how the state will comply with air quality standards according to the Federal Clean Air Act.

  13. Modeling Overview • What is a model? • A tool used to predict impacts from new and existing sources of emissions. • Mathematical equations used to simulate atmospheric processes • Transport • Dispersion • Transformation • Removal

  14. Modeling Overview • Two levels • Screening (SCREEN3 or AERSCREEN) • One source • Worst-case meteorology • Refined (ISC3 and AERMOD) • Many sources • Specific meteorology • Many locations of interest

  15. AERMOD • American Meteorological Society/Environmental Protection Agency Regulatory Model

  16. AERMOD: Input Information • Source input data • Source location, parameters, emission rates • Different types of sources: • Point • Area • Volume • Building (downwash) information • Mechanical turbulence due to structure • Enhanced turbulence = greater dispersion • Can reduce plume rise

  17. AERMOD: Input Information • Downwash Simulation

  18. AERMOD: Input Information • AERMAP • Calculates elevations for: • Terrain Data • Source base elevations • Building base elevations • Receptor base elevations • Receptor locations • Where concentrations are predicted

  19. AERMOD: Input Information • AERMET • Processes meteorological data into format used by model • Meteorological data • Surface data • Upper air data

  20. AERMOD: Input Information • AERMET (continued) • Incorporates surface characteristics • AERSURFACE • Land use/land cover data • Albedo • Bowen ratio • Surface roughness

  21. AERMOD: Model Options • Source Groups • Group sources together to get an impact for that group. • Several source groups may be setup in a single run • Averaging Times • 1-hr, 3-hr, 8-hr, 24-hr, or annual • Dependent on the pollutant being evaluated.

  22. AERMOD: Model Options • Hour of Day Scalar • When hours of operation need to be limited. • Wind Scalar • Applied to particulate sources (i.e. storage pile) for more accurate wind speeds.

  23. Example: AERMOD Output Averaging Time OverallConcentration/Impact Source Group

  24. Example: Property Line

  25. Example: Receptor Grid Receptor

  26. Example: Buildings & Sources

  27. Questions? Thank you!

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