inclusion of the primary and secondary PM2.5 impacts 1 of nearby sources and of

2 monitored background. There are specific discussions of the modeling inventory and

3 the monitored background. Section IV concludes with information on determining

4 significant contributions to modeled violations.

5 V. PM2.5 Increment Analysis: A detailed discussion of the assessment of primary

6 and secondary PM2.5 impacts of a new or modifying source with respect to the

7 increment.

8

In summary, the Draft Guidance for PM2.5 Permit Modeling recommends appropriate

15 technical approaches for conducting a PM2.5 NAAQS compliance demonstration that includes

16 more adequate accounting for contributions from secondarily formed PM2.5 concentrations

17 resulting from a proposed new or modifying source’s precursor emissions. The EPA is

18 providing the Draft Guidance for PM2.5 Permit Modeling for public review and comment through

Public Review Draft 03/04/2013

vii

April 17, 2013, with the intent of issuing 1 final guidance by July 31, 2013.

2 The Draft Guidance for PM2.5 Permit Modeling is intended as a statement of the EPA’s

3 preliminary recommendations with respect to conducting PM2.5 PSD compliance demonstrations

 

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