compliance demonstration is required for the direct PM2.5 emissions based on

19 dispersion modeling and the applicant must also assess the potential impact of the

Public Review Draft 03/04/2013

19

significant precursor emissions from the project 1 source. The accounting of the

2 precursor emissions impact on secondary PM2.5 formation may be completely

3 qualitative in nature, may be based on a hybrid of qualitative and quantitative

4 assessments utilizing existing technical work, or may be a full quantitative

5 photochemical grid modeling exercise. The EPA anticipates only a few situations

6 would require explicit photochemical grid modeling.

For “Case 4—Secondary Air Quality Impacts Only,” if the direct PM2.5 emissions

8 are less than the SER of 10 tpy, but either the NOx or SO2 precursor emissions are

9 greater than their respective SERs of 40 tpy, then a PM2.5 compliance

10 demonstration for the direct PM2.5 emissions is not required, but the applicant

11 must assess the potential impact of the significant precursor emissions from the

12 project source. Similar to “Case 3,” the accounting of the precursor emissions

13 impact on secondary PM2.5 formation may be completely qualitative in nature,

14 may be based on a hybrid of qualitative and quantitative assessments utilizing

15 existing technical work, or may be a full quantitative photochemical grid

16 modeling exercise. Again, the EPA anticipates only a few situations would

17 require explicit photochemical grid modeling.

 

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 english:

 castellano: DISPER CUSTIC DESCAR RADIA    italiano:     

 

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deutsch: DIS CUS  DES  RAD

castellano: DIS CUS DES  RAD   english: DIS CUS DES RAD  

 

 português: DIS CUS DES RAD   italiano:   DIS CUS  DES RAD

 

français:  DIS CUS DES RAD