Class I Analysis Preparation

Before preparing and submitting a Class I modeling protocol to MEDEP-BAQ (or beginning any modeling), it would very helpful to read and become familiar with recommendations and methodologies in the following documents:

• Final FLAG Phase I Report (December, 2000)

• Interagency Workgroup on Air Quality Modeling (IWAQM) Phase 2 Summary Report for Modeling Long-Range Transport

• Guidance For Estimating Natural Visibility Conditions Under the regional Haze Rule (EPA-454/B-03-005)

In addition, the CALPUFF modeling suite (CALPUFF, CALMET, CALPOST) and the associated utilities are available for download at no cost from the TRC website.

Class I Locations And AQRVs

For any major new source or any major modification (to an existing major or minor source), it is possible that a Class I increment and/or Air Quality Related Values (AQRVs) analyses will need to be performed, as required by the affected Federal Land Manager (FLM) of the 4 designated Class I areas in/near Maine. MEDEP-BAQ (the permitting authority) will work in close consultation with the FLMs and will ultimately be responsible for making the final determination regarding the Class I analyses.

The locations of the four Class I areas can be found in the following maps:

Acadia National Park

Roosevelt Campobello International Park

Moosehorn National Wildlife Refugee

Presidential Range/Dry River Great Gulf Wilderness Area

The FLM of each Class I area will make a determination as to the level of analysis necessary, if any, to evaluate increment and/or AQRVs. Potential AQRVs include: dry/wet deposition, visibility impacts, etc.

General information on AQRVs can be found at: http://www2.nature.nps.gov/air/Permits/ARIS/aqrv.cfm

Information on site-specific AQRVs can be found at the following sites:

• Presidential Range - Dry River Wilderness Area

• Moosehorn National Wildlife Refuge

• Acadia National Park

• Roosevelt-Campobello International Park

Proximity of Sources to Class I Areas

Should an FLM request any Class I increment and/or AQRV analyses, the model(s) and methodology will depend on the distance from the source to the affected Class I area. The modeled source will fall into one of the two following categories:

• Sources within 50 kilometers of a Class I area
• Sources beyond 50 kilometers of a Class I area