TABLE OF CONTENTS

Executive Summary to the Draft Guidance ....................................................................................iii

Acknowledgements........................................................................................................................ ix

I. Background............................................................................................................................. 1

II. Guidance Overview ................................................................................................................. 7

II.1 Significant Emissions Rate ............................................................................................ 13

II.2 Significant Impact Analysis........................................................................................... 13

II.3 Cumulative Impact Analysis.......................................................................................... 17

II.4 Assessment Cases .......................................................................................................... 17

III. Significant Impact Analysis............................................................................................... 21

III.1 Assessing Primary PM2.5 Impacts .................................................................................. 23

III.2 Assessing Secondary PM2.5 Impacts .............................................................................. 25

III.2.1 Qualitative Assessments ............................................................................................ 25

III.2.2 Hybrid Qualitative/Quantitative Assessment............................................................. 29

III.2.3 Full Quantitative Photochemical Grid Modeling....................................................... 32

III.2.3.1 Use of Photochemical Grid Models for Secondary PM2.5 Impacts ........................ 33

III.2.3.2 Source Apportionment and Source Sensitivity in Photochemical Grid Models .... 35

III.2.3.3 Sub-grid Plume Treatment in Photochemical Grid Models................................... 36

III.3 Comparison to the SIL................................................................................................... 38

IV. Cumulative Impact Analysis.............................................................................................. 43

IV.1 Modeling Inventory ....................................................................................................... 44

IV.2 Monitored Background .................................................................................................. 46

IV.3 Comparison to NAAQS ................................................................................................. 48

IV.4 Determining Significant Contributions to Modeled Violations ..................................... 52

V. PM2.5 Increment Analyses.................................................................................................... 55

VI. References......................................................................................................................... 61

Appendix A: The Scope and Magnitude of the PM2.5 Air Quality Problem...............................A-1

Appendix B: General Guidance on Use of Dispersion Models for Estimating Primary PM2.5

Concentrations .............................................................................................................................B-1

Appendix C: Example of a Qualitative Assessment of the Potential for Secondary PM2.5

Formation....................................................................................................................................C-1

 

 

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