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
D. The model's chemical transformation algorithms
should be employed.
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
(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
(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,
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