17 An explanation of the rationale for using the 3rd highest 24-hour value to represent the 98th percentile is provided

on page 19 of the March 1, 2011 memo “Additional Clarification Regarding Application of Appendix W Modeling

Guidance for the 1-hour NO2 National Ambient Air Quality Standard” (U.S. EPA, 2010b).

18 75 Fed. Reg. at 64,890; 61 Fed. Reg. 38,250, 38,293 (July 23, 1996); In re Prairie State Generating Co., 13

E.A.D. 1, 103-09 (EAB 2006). EPA has sometimes described this step as a “culpability analysis.”

Public Review Draft 03/04/2013

53

52.21(k)(2). The Court observed that Section 51.165(b)(2) “simply 1 states that a source may be

2 deemed to violate the NAAQS if its exceeds the SILs in certain situations.” (Op. at 14). For this

3 reason, the Court did not see the need to resolve the Petitioner’s challenge to the EPA’s

4 methodology for determining the PM2.5 values in Section 51.165(b)(2) of the regulations, which

5 are the same as the Class II area values in the vacated Sections 51.166(k)(2) and 52.21(k)(2).

6 The court decision did not directly address the use of the values in section 51.165(b)(2) to

7 determine whether a source significantly contributes to a modeled violation. However, in light

 

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