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Session 7, Unit 13 Regulatory Procedures and PSD Modeling

Session 7, Unit 13 Regulatory Procedures and PSD Modeling. Types of Modeling Analyses. Modeling for permits Criteria pollutants State programs Federal programs Prevention of Significant Deterioration (PSD) program Conformity rule

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Session 7, Unit 13 Regulatory Procedures and PSD Modeling

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  1. Session 7, Unit 13Regulatory Procedures and PSD Modeling

  2. Types of Modeling Analyses • Modeling for permits • Criteria pollutants • State programs • Federal programs • Prevention of Significant Deterioration (PSD) program • Conformity rule • Environmental Impact Statement (EIS) – may include air toxics too • Air toxics • State air toxics programs • Boiler and Industrial Furnace burning hazardous waste under RCRA (the BIF rule) • Multi-pathways risk assessment for hazardous waste combustors

  3. Types of Modeling Analysis • Modeling for State Implementation Plan (SIP) and policy • Modeling for other programs • Remediation • Categorized by pathway • Air pathway analysis (APA) • Multi-pathway risk assessment • Categorized by remedial project stage • Baseline risk assessment • Risk associated with remedial actions • Reconstruction of past event • Accidental release (112 r regulations) • Modeling for research • Modeling for litigation

  4. Regulatory Procedures • USEPA Air Quality Modeling Guideline (Appendix W to 40 CFR ) and state’s guidance documents • Process • Identify the trigger for modeling and define the scope of the modeling analysis • Discuss with regulators on modeling approach and/or submit a modeling protocol • Collect all necessary data and perform modeling analysis • Prepare and submit modeling report

  5. Level of Sophistication • Screen level modeling analysis • Most commonly used model – SCREEN3 • Refined modeling analysis • Current widely used model – ISC3

  6. Modeling Protocol • Set the rule of the game • Elements in a modeling protocol • Facility information (area map, plot plan,facility/process descriptions, etc.) • Modeling methodology (procedures, model selection, etc.) • Source data (emissions rates, stack parameters, etc.) • Building dimensions and building downwash • Rural/urban classifications • Receptor grids and terrain treatment • Met data • Use it as the shell for the modeling report • Protocol – “How are we going to do it” • Report – “How did we do it and what was the results

  7. PSD Modeling • Overview of the PSD program • The concept • National Ambient Air Quality Standard (NAAQS) • PSD Increment • Applicability • Major sources • Major modifications • See ENV 7331 materials for more info

  8. PSD Modeling Procedures • Overview Significance Analysis NAAQS Analysis PSD Increment Analysis

  9. PSD Modeling Procedures • Significance analysis

  10. PSD Modeling Procedures • NAAQS Analysis

  11. PSD Modeling Procedures • PSD Increment Analysis

  12. Rural/Urban Classification • Land use procedure - Auer method • Analyze a 3-km radius circle • If types I1, I2, C1, R2, and R3 account for 50% or more  urban • Population density procedure • If population density > 750 people/km2 urban

  13. Receptor Grids • Types of coordinate systems • Cartesian grid • Polar grid • Types of grids • Regular grids • Spacing – Coarse, medium, fine, tight • Plant boundary receptors • Discrete receptors • Elevation data • Manual data • Digital terrain elevation data

  14. Session 7, Unit 14Chimney Design

  15. Stack Height • Stack height considerations • GEP and environmental regulatory factor • FAA regulation [no lighting and marking below 200 ft (61 m)] • Structure • Costs

  16. Plume patterns • Looping • Coning • Fanning • Trapping • Lofting • Fumiigation

  17. TVA Models • Coning • Dispersion equation (equation. 13.3 & 13.4) • More suited to large coal-fired steam plant • The real differences • No ground reflection • Different dispersion coefficients (Fig. 13.6 & 13.7) • Different plume rise equation (equation. 13.1) • Example – Problem 13.1 • Compare results with normal dispersion calculation • Other conditions

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