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2.3.1 Indirect Source Review ________________________________________________________16
2.3.2 Transportation Conformity _____________________________________________________18
2.3.3 General Conformity ___________________________________________________________18
2.3.4 NAAQS Assessment - General __________________________________________________19
2.3.5 NAAQS Assessment - Roadway Intersection Analysis ________________________________21
3. EMISSIONS ASSESSMENT___________________________________________23
3.1 Introduction____________________________________________________________ 23
3.2 Emission Sources________________________________________________________ 24
3.2.1 Aircraft_____________________________________________________________________24
3.2.2 Auxiliary Power Units _________________________________________________________25
3.2.3 Ground Support Equipment or Aerospace Ground Equipment __________________________25
3.2.4 Ground Access Vehicles _______________________________________________________26
3.2.5 Stationary Sources ____________________________________________________________26
3.3 Available Models ________________________________________________________ 28
4. DISPERSION ASSESSMENT__________________________________________31
4.1 Introduction____________________________________________________________ 31
4.2 Dispersion Inputs _______________________________________________________ 32
4.2.1 Emissions Sources ____________________________________________________________32
4.2.2 Meteorology_________________________________________________________________32
4.2.3 Topography _________________________________________________________________33
4.2.4 Receptors ___________________________________________________________________33
4.3 Available Models ________________________________________________________ 33
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5. CONFORMITY _____________________________________________________37
5.1 Applicability____________________________________________________________ 38
5.2 Analysis _______________________________________________________________ 41
5.3 Procedure______________________________________________________________ 42
5.3.1 Conformity Steps Summary_____________________________________________________42
5.3.2 Conformity and NEPA_________________________________________________________42
5.4 References/Sources ______________________________________________________ 43
6. MITIGATION/CONTROL MEASURES ________________________________45
6.1 Aircraft________________________________________________________________ 45
6.1.1 Single/Reduced Engine Taxiing__________________________________________________45
6.1.2 Derate Takeoff Power _________________________________________________________46
6.1.3 Reduce Use of Reverse Thrust___________________________________________________46
6.2 Auxiliary Power Units ___________________________________________________ 47
6.3 Ground Support Equipment ______________________________________________ 47
7. REFERENCES ______________________________________________________49
7.1.1 Reference List _______________________________________________________________49
7.1.2 Annotated Reference List ______________________________________________________55
8. INDEX _____________________________________________________________69
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APPENDICES
Appendix A : Air Quality and Environmental Documents
Appendix B : Project Reviewer’s Checklist
Appendix C : Key Pollutants
Appendix D : Aircraft Emission Methodology
Appendix E : Auxiliary Power Units Emission Methodology
Appendix F : Ground Support Equipment and Aerospace Ground Equipment Emission Methodology
Appendix G : Ground Access Vehicles Emission Methodology
Appendix H : Stationary Emission Methodology
Appendix I : Dispersion Methodology
Appendix J : State Indirect Source Review Regulations
LIST OF TABLES
Table 1: General Conformity Threshold Rates ............................................................................................199
Table 2: Other EPA Preferred Air Quality Models........................................................................................35
Table 3 : Threshold Levels For Nonattainment Areas (NAAs) *...................................................................40
Table 4 : Threshold Levels For Maintenance Areas (MAs)...........................................................................40
LIST OF FIGURES
Figure 1. Air Quality Assessment Process for Airports and Air Bases - Part 1 ...............................................9
Figure 2. Air Quality Assessment Process for Airports and Air Bases - Part 2 .............................................10
Figure 3. Air Quality Analysis Guidelines and Thresholds............................................................................17
　
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