12 predicted each year at each receptor such be compared to the applicable SIL, since that

13 represents the maximum contribution that the source could make.

14

2 Where the screening analysis described in section II is insufficient to show that a source

3 will not cause or contribute to a violation of the NAAQS , a cumulative impact assessment

4 would be necessary to account for the combined impact of the new or modifying source’s

5 emissions, emissions from other nearby sources, and representative background levels of PM2.5

6 within the modeling domain. The cumulative impacts are then compared to the NAAQS to

7 determine whether the new or modifying source emissions will cause or contribute to a violation

8 of the NAAQS. This section provides details on conducting the appropriate cumulative impact

9 assessment for PM2.5 based on comparable approaches applied for other criteria pollutants, as

10 appropriate, and different approaches based on the technical issues identified previously.

11 The cumulative impact assessment should include the following components of PM2.5

12 impacts, as appropriate, for comparison to the NAAQS:

13 Proposed new or modifying source

14 o Primary impacts on PM2.5 from direct PM2.5 emissions

15 o Secondary impacts on PM2.5 from precursor emissions

16

 

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