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or modified source. The analysis compares the predicted concentrations to the significant impact levels (NAAQS and PSD increments). The complexity of the screening varies depending on the number of pollutants that must be analyzed and the proximity of the source to other major sources.

If the initial dispersion modeling shows that the impact from the proposed source for any regulated pollutant is above the NAAQS and PSD increments, more detailed and representative analysis may be required. This involves more elaborate modeling and may include collecting site specific meteorological data.

The NAAQS analysis consists of the following steps:

1. Define the significant impact area of the proposed new or modified major source for each pollutant subject to review.

2. Construct an inventory of all existing and proposed sources of emissions in the total screening area.

3. Determine the ambient air concentrations of each pollutant from monitoring data, excluding emissions from the proposed source.

4. Model the proposed source in conjunction with every identified source in the emissions inventory.

5. Determine the predicted total air quality impact by adding the total modeled concentrations to the existing monitored air quality data.

6. Compare the predicted total air quality impact to the NAAQS for each pollutant to determine compliance. The PSD increment analysis consists of the following steps:

1. Define the significant impact area of the proposed new or modified major source for each pollutant subject to PSD review. This is the same process as used in the NAAQS analysis.

2. Construct an inventory of all sites established after the baseline date (the data when the first PSD source was established in the area).

3. Determine the total predicted increment concentration from the proposed source or modification inclusive of other increment-consuming sources. 4. Compare the total increment concentration to the allowable PSD increment to determine compliance with the increments.

To obtain a permit, the predicted impact must be below the NAAQS and the allowable PSD increments. In addition, all pollutants subject to PSD review require additional impact analyses. These include:

• A growth analysis

• A soils and vegetation analysis

• A visibility impairment analysis

The incremental degradation that is allowed in an attainment area varies with the classification of attainment area. The incremental degradation allowed in Class I areas, which are normally national parks or national monuments, is smaller when compared to the remaining attainment areas.

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