If you are seeing this message, you are likely using an older browser to view this site. This website's content is fully accessible to all browsers, however the web site will look much better and your experience will be much more enjoyable if you upgrade your browser to a more current version. Please visit this web site to upgrade your browser.
Title Page
Preface.................................................................................................i
List of Acronyms & Abbreviations.........................................................ii
Table of Contents, Appendixes, and List of Tables...............................iii
1. Sources Requiring Dispersion Modeling
a. Criteria Pollutants Impacts in Attainment Areas..............................1
b. Criteria Pollutants Impacts in Nonattaiment Areas...........................2
c. Hazardous Air Pollutants..............................................................2
d. Volatile Organic Compounds.........................................................3
2. Criteria Pollutant Standards and Toxic Screening Levels.............4
a. Criteria Pollutants.........................................................................4
b. Toxic Screening Levels..................................................................4
3. PSD Class I Areas and Air Quality Related Values........................5
4. Modeling Protocol and Worksheets...............................................5
5. Air Quality Models.........................................................................6
a. EPA Preferred Models..................................................................6
b. Technical Options........................................................................6
c. Proprietary Models.......................................................................7
6.Source Data..................................................................................7
a. Emission Rates...........................................................................7
b. Surrounding Source Contributions.................................................7
c. Background Concentrations..........................................................8
7. Receptor Grids and Related Topics...............................................8
a. Polar/Rectangular Receptor Grids..................................................8
b. ‘Ambient Air' Boundary Receptors..................................................8
c. Terrain Elevations.........................................................................9
8. Meteorological Data......................................................................9
a. Screening Meteorological Data......................................................9
b. Representative Meteorological Data...............................................9
9. Time Averaging Periods..............................................................10
10. Building Downwash.....................................................................10
11. Cavity Modeling...........................................................................10
12. Visibility Modeling.......................................................................10
13. Submittal Requirements..............................................................11
a. General Requirements................................................................11
b. NAAQS.....................................................................................11
c. PSD Increment...........................................................................11
References..........................................................................................12
Appendix I
Methodology for Emission Threshold Values for Hazardous Air Pollutants...13
Appendix II
Minimum Requirements to Establish Data Representativeness...................18
Appendix III
Air Quality Modeling Checklist.................................................................19
Appendix VI
Utah Air Conservation Rule Language and Definitions for Modeling..............21
Table 1
Criteria Pollutant Emission Levels for Dispersion Modeling..........................2
Table 2
Emission Threshold Factors for Hazardous Air Pollutants...........................3
Table 3
State of Utah Air Quality Standards for Criteria Pollutants...........................4
Table 4
Significant Air Quality Impact for Determining Impact Area..........................8
Table 5
Time-Scaled Factors for Converting Averaging Periods..............................10