Given the complexity of the technical issues that arise 1 in the context of demonstrating

2 compliance with the PM2.5 NAAQS, we strongly encourage adherence to the recommendations

3 in Section 10.2.1 of Appendix W that “[e]very effort should be made by the Regional Office to

4 meet with all parties involved in either a SIP revision or a PSD permit application prior to the

5 start of any work on such a project. During this meeting, a protocol should be established

6 between the preparing and reviewing parties to define the procedures to be followed, the data to

7 be collected, the model to be used, and the analysis of the source and concentration data.

8 Furthermore, we recommend that the consultative process involve regular communication

9 between the appropriate permitting authority and the permit applicant at key milestones to ensure

10 timely resolution of issues that may arise.

11 As necessary, the EPA Regional Office may seek clarification from the EPA’s Office of

12 Air Quality Planning and Standards (OAQPS) on technical issues and areas of concern in a

13 modeling protocol or compliance demonstration. Through these interactions and subsequent

14 resolutions of the specific issues, clarifications and interpretations of modeling procedures can

15 ultimately become official EPA guidance. This can happen in several ways: 1) the procedures

 

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