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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

WESTAR1-Hour NO2 Modeling Requirements

2012 Spring Business Meeting

Seattle, Washington



Review NO2 Modeling requirements to identify issues causing difficulties;

Identify and prioritize realistic solutions, and;

Forward solutions on to the Directors.

committee members

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



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)

important issues

Important Issues

Temporary/Portable/Intermittent/ Seasonal Sources

In-Stack Ratios

Significant Impact Level (SILs)

Background Ambient Ozone Concentrations

Other Monitoring Needs



Temporary/Portable/Seasonal/ Intermittent Sources

Craft Letter to EPA Requesting Refined Definitions & Clarifications Using Specific Examples (e.g.; Case-by-Case)



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.



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.



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?)



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