III. MESOPUFF-II

The following applies to all applications of MESOPUFF

II within the context of the Phase 1 recommendation.

A. Follow the recommendations found in Appendix A.

B. The cross over distance for the time dependent

dispersion curves should be set to 10 km.

C. Both wet and dry deposition options should be

employed.

D. The model's chemical transformation algorithms

should be employed.

IV. METEOROLOGY

A. PERIOD OF RECORD (Applies to both MESOPUFF-II

and Guideline models)

(1) A five year National Weather Service (NWS)

meteorological data record should be used

when the applicant source is either > 50 km

from the Class I area or is within 50 km

and does not have at least one year of onsite

data.

(2) For an applicant source located within 50

km of a Class I area, all sources being

modeled should use a representative data

record which corresponds to the time period

of the on-site data. On-site data can not

be used unless it covers at least one full

year. Furthermore, if more than one year

of on-site data exists it should be used up

to the most recent 5 years.

B. SELECTION OF DATA BASES

(1) GUIDELINE MODEL: It may be desirable to

divide the analysis domain into

meteorologically similar areas and use area

specific representative meteorological data

to model all sources' impacts in that area.

The use of multiple meteorological data

bases is not the normal practice with

Guideline models and should be approved on

a case-by-case basis by the appropriate

regulatory authority.

(2) MESOPUFF-II: The number and location of

the NWS meteorological data bases to be

used in the MESOPUFF-II analysis should be

determined on a case-by-case basis,

generally using all available,

representative data.

 

 

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