II. LEVEL II ANALYSIS (MESOPUFF-II)

A. PSD INCREMENT AND STANDARDS

(1) For sources > 50 km (and up to several

hundred km) from all Class I area receptors

MESOPUFF-II should be used.

(2) For sources 50 km from all Class I area

receptors, models recommended for use in

the EPA Modeling Guideline should be used.

(3) For those sources located such that some

Class I receptors are 50 km and others

are > 50 km the applicant may either

(a) model all receptors with a Guideline

model, or

(b) model those receptors which are > 50

km with MESOPUFF-II and those which

are 50 km with a Guideline model.

(4) Concentrations from all sources should be

summed hour-by-hour, receptor-by-receptor

and pollutant-by-pollutant.

B. VISIBILITY

(1) All sources being analyzed, regardless of

their distance from the Class I area,

should be modeled with MESOPUFF-II

following the procedures set forth in

Appendix A.

(2) Using the predicted concentrations of SO=

4

and NO , regional haze calculations should 

3

be made in accordance with the procedures

set forth in Appendix B.

(3) If it is determined that plume blight

analyses need to be made, the

recommendations regarding use of VISCREEN

and PLUVUE II in the Guideline on Air

Quality Models (Revised) should be

followed.

C. OTHER AQRVs (Depositional Loading)

(1) All sources being analyzed, regardless of

their distance from the Class I area,

should be modeled with MESOPUFF-II

following the procedures set forth in

Appendix A.

(2) Outputs of SO and NO deposition should be = 

4 3

used, as necessary, to quantify the impact

to aquatic and terrestrial ecosystems.

Close coordination with the Federal Land

Manager will be necessary in determining

the appropriate averaging times for this

analysis.

 

 

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