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WESTAR 1-Hour NO2 Modeling Requirements

WESTAR 1-Hour NO2 Modeling Requirements. 2012 Spring Business Meeting Seattle, Washington. Goals. Review NO2 Modeling requirements to identify issues causing difficulties; Identify and prioritize realistic solutions, and; Forward solutions on to the Directors. Committee Members.

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WESTAR 1-Hour NO2 Modeling Requirements

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  1. WESTAR1-Hour NO2 Modeling Requirements 2012 Spring Business Meeting Seattle, Washington

  2. Goals Review NO2 Modeling requirements to identify issues causing difficulties; Identify and prioritize realistic solutions, and; Forward solutions on to the Directors.

  3. Committee Members Alan Schuler – Alaska DEC Clint Bowman – Washington Dept. of Ecology Cyra Cain – Montana DEQ Jeff Gabler – WESTAR Council Phil Allen – Oregon DEQ Tom Orth – Utah DEQ

  4. Activities Conference Calls Identify and Prioritize Issues Identify and Prioritize Realistic Solutions EPA Participation (Roger Brode): Clarify and Explain Guidance Language Summarize Current/Future Activities Discuss EPA’s Position on Important Issues Summary Report from EPA’s 10th Conference on Air Quality Modeling (Marty Gray – UT DEQ) Presented Work to Technical Committee Detailed Write-ups (see links in agenda)

  5. Important Issues Temporary/Portable/Intermittent/ Seasonal Sources In-Stack Ratios Significant Impact Level (SILs) Background Ambient Ozone Concentrations Other Monitoring Needs

  6. Solutions Temporary/Portable/Seasonal/ Intermittent Sources Craft Letter to EPA Requesting Refined Definitions & Clarifications Using Specific Examples (e.g.; Case-by-Case)

  7. Solutions In-Stack Ratios State agencies explore enhancements to compliance testing and CEM programs that would allow the instruments to report the in-stack ratio; Information compiled in national database to assist EPA in proposing more representative NO2/NOx in-stack ratios, and; Information used to identify default ratios that are process based, or it may provide support for a lower 1-hour NO2/NOx in-stack default ratio.

  8. Solutions Significant Impact Level (SIL) Seek EPA confirmation that they are willing to accept higher interim values, or even alternative approaches (such as a population-dependent range of values); NESCAUM States Use 10 ug/m3 for 1-hr NO2 SIL, and; The committee further request that EPA consider higher SILs in their pending rulemaking.

  9. Solutions Background Ambient Ozone Concentrations Establish a database of all rural hourly ozone concentrations, and corresponding NO2 and NOx values from participating states, and; Additional monitoring may be required through WESTAR financial assistance. Modeled Background Concentrations Modeling domain could cover entire western state region Modeled O3, NOx, NO2 + monitored concentrations(apply to other pollutants and interstate transport?)

  10. Solutions Other Needs EPA Needs Additional Field Studies to Fully Evaluate Modeling Options; Is WESTAR Willing to Fund a Case Study, or; Partnership with Other Regional Organization? Tasks Include: Identify participating facility Collect ambient O3, NOx and meteorological data near NOx source Measure/calculate NOx emissions and in-stack ratios Compare modeled NO2 impacts to ambient NO2 concentrations Committee will provide additional information if Directors support concept

  11. Questions &Recommendations

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