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Modeling Guidance and Examples for Commonly Asked Questions (Part 1)

Modeling Guidance and Examples for Commonly Asked Questions (Part 1). Rachel Melton and Matthew Kovar Air Permits Division Texas Commission on Environmental Quality Advanced Air Permitting Seminar 2014. Agenda. Representative Background Monitor:

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Modeling Guidance and Examples for Commonly Asked Questions (Part 1)

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  1. Modeling Guidance and Examples for Commonly Asked Questions (Part 1) Rachel Melton and Matthew Kovar Air Permits Division Texas Commission on Environmental Quality Advanced Air Permitting Seminar 2014

  2. Agenda • Representative Background Monitor: • Selecting/Justifying a Representative Monitor • Calculating the Design Value • 1-hr NO2 NAAQS: • Treatment of Intermittent Emissions • Tier 3 Options for NOx-to-NO2Conversion

  3. Purpose of a Representative Monitor The purpose of a representative monitor is to estimate existing ambient air quality at the project site and in areas which may be affected by emissions from the project.

  4. What Is a Representative Monitor? • A monitor that can capture nearby sources not explicitly modeled in an air dispersion modeling analysis • Nearby sources may include: • mobile sources & non-stationary sources • natural sources & unidentified sources

  5. Selecting a Representative Monitor • Factors to consider: • proximity of the monitor to the project site; • similarity of topography, meteorology, and land-use for the project and monitor site; • stationary source types and amount of emissions around the monitor compared to the project site; • emissions from mobile or other non-stationary source activities; and • meets completeness criteria

  6. Resources for Selecting a Representative Monitor EPA AirData EPA Design Values Texas Air Monitoring Information System (TAMIS) Yearly Summary Reports

  7. Justifying a Representative Monitor • The applicant must justify why the monitoring data selected are representative of the existing air quality in the area of the project site • Qualitative assessment • Quantitative assessment

  8. Qualitative Assessment:Monitor site relative to project site • Proximity, topography, and land-use: • aerial photography • Meteorology: • prevailing winds / influential sources

  9. Quantitative Assessment:Monitor site relative to project site • County wide comparison: • population • emissions: • similar source categories • mobile & other non-stationary source • Nearby emissions (10 km) comparison: • quantify emissions for RNs near the project site and monitor site Houston Deer Park #2 monitor, highlighted RNs within 10kms

  10. ExampleProject site Site located near Port Arthur in Jefferson County adjacent to various industrial sites; 786 TPY of reported PM2.5 emissions near the site.

  11. ExamplePM2.5 monitor for use as a background The background monitor located in Harris County near Galveston Bay in a residential area with only a few industrial sites nearby; 282 TPY of reported PM2.5 emissions near the monitor.

  12. ExamplePM2.5 monitor for use in justifying the SIL The monitor for SIL justification located in Harris County near industrial sites; 2765 TPY of PM2.5 near the monitor.

  13. Determine the Monitored Design Value • EPA Completeness Criteria • The representative background concentration should be in the form of the standard: • Exceedance-based: • Example 1-hr CO: • H2H from most recent year • Statistically-based: • Example 1-hr NO2: • 3-year average of the 98th percentile of the annual distribution of maximum daily 1-hr concentrations

  14. Contact Information • Rachel Melton • Air Dispersion Modeling Team • (512) 239-2358 • rachel.melton@tceq.texas.gov • Matthew Kovar • Air Dispersion Modeling Team • (512) 239-0180 • matthew.kovar@tceq.texas.gov Matthew Kovar Rachel Melton (512) 239-2358 rachel.melton@tceq.texas.gov (512) 239-0180 matthew.kovar@tceq.texas.gov Air Permits Division Air Permits Division

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