1 case-by-case basis.

2 As discussed in more detail in the March 1, 2011, clarification memorandum regarding

3 Appendix W modeling guidance for the 1-hour NO2 NAAQS (U.S. EPA, 2011f), Section 8.2.3

4 of Appendix W emphasizes the importance of professional judgment in the identification of

5 nearby and other sources to be included in the modeled emission inventory and establishes “a

6 significant concentration gradient in the vicinity of the [proposed] source” as the main criterion

7 for this selection. Appendix W also suggests that “the number of such [nearby] sources is

8 expected to be small except in unusual situations.” (Section 8.2.3.b). The March 1, 2011,

9 guidance also includes a detailed discussion of the significant concentration gradient criterion

10 included in Section 8.2.3.b of Appendix W, indicating that the significant concentration gradient

11 criterion suggests that the emphasis on determining which nearby sources to include in the

12 cumulative modeling analysis should focus on the area within about 10 kilometers of the project

13 location in most cases. However, several application-specific factors should be considered when

 

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