4that account for contributions from secondary PM2.5. It is draft guidance for public review and
5comment and is not yet considered final EPA guidance. Since each permitting action will be
6considered on a case-by-case basis, this document does not limit or restrict any particular
7approach applicants and permitting authorities may take to conduct the required compliance
8demonstrations. The draft guidance does not impose binding, enforceable requirements. This
9document does not substitute for statutory provisions or regulations, nor is it a regulation itself.
10Thus, this draft guidance document does not represent final agency action and cannot be relied
11upon to create any rights or obligations enforceable by any party.
2We would like to acknowledge contributions from members of the National Association
3of Clean Air Agencies (NACAA) PM2.5 Modeling Implementation Workgroup (NACAA
4Workgroup) in providing a detailed set of recommendations (NACAA, 2011) to the EPA with
5regards to PM2.5 permit compliance demonstration modeling. This NACAA Workgroup was
6comprised of state and local air permitting agency dispersion modelers, permit engineers, and
7technical staff from throughout the country. In particular, we recognize Jim Hodina (Linn
8County Public Health), Bob Hodanbosi (Ohio EPA, Division of Air Quality), and Clint Bowman
9(Washington Department of Ecology) for their exemplary roles as Chairpersons for the
10Emissions Inventories, Secondary Formation from Project Source, and Representative
11Background Concentrations Sub-workgroups, respectively.
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