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or other appropriate conditions.
The selection of appropriate meteorolog cal data shou d be coordinated and verified early and on a
case-by-case basis with the U.S. EPA, state and/or local agency that will review the modeling
Any proposals for alternative approaches (e.g. number scenarios analyzed or
meteorological conditions requiring modeling) that expedite the work while meeting the reviewing
agency(s) requirements should also be discussed and documented at this time.
Topography
Describes the potential effects of buoyant plumes and complex terrain.
For additional information on aircraft plume behavior, see the following publication:
Preliminary Report: The Use of LIDAR to Characterize Aircraft Initial Plume Characteristics
prepared by R. Wayson, G. Flemming & B. Kim, Volpe National Transportation Systems
Center, U.S. DOT, FAA, Office of Environment & Energy, October, 2002. (Reference 105)
Receptors (p. 33)
Defines the term and generally discusses the locations and amounts considered appropriate.
The number and placement of receptors is determined on a case-by-case basis taking into
consideration such factors as the size and complexity of the project, the presence of sensitive
receptors and the computer run time, among others. Based on EPA guidance developed for the
modeling of other air emission sources, the following considerations also appropriate for
receptor locations when modeling airport emissions:
Perimeter fence line
Onsite areas of public access (i.e. main terminal area)
Adjoining ne ghborhoods or other offsite sensitive receptors
Offsite intersections (if CO hot-spot modeling is conducted)
Nearby Class 1 areas
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AIR QUALITY PROCEDURES FOR CIVILIAN AIRPORTS & AIR FORCE BASES
(THE "AIR QUALITY HANDBOOK")
ADDENDUM (Continued)
See also Section 4.1.2 (Di i l ) of the EDMS Reference
Manual (Section 8.2.2).
4.3 (p. 33)
).
nd st )
–
) –
)
files.
Nearby air monitoring sites
spers on Calcu ations – Receptor Locations
and EPA’s Appendix W, Guideline on Air Quality Models
Available Models
Identifies and discusses EPA-preferred dispersion models including EDMS, CAL3QHC and ISC3.
Also identifies several other models such as CALINE3 and Urban Airshed Model in Table 2
The reference (2 para., 1 sentence) to the Emissions Dispersion Modeling System (EDMS
should be updated to read as follows:
Emissions Dispersion Modeling System (EDMS) The EDMS is the EPA preferred and the
FAA required model for the assessment of aviation-related sources of the EPA-criteria air
pollutants and their precursors.
The following model description should also be added to this section:
AERMOD (Reference 107 This EPA model is designed to simulate the dispersion of nonreactive
air pollutants over a wide variety of conditions. It is intended that this model will replace
the Point-Area-Line (PAL model and in some cases the Industrial Source Complex (ISC) model
as EPA’s preferred guideline model. Versions 4.0 and higher of EDMS contain AERMOD as the
dispersion model. A meteorological data preprocessor is also used with this model called
AERMET (Reference 106). Note: AERMET does not allow the user to create their own weather
Note that the EDMS, CAL3QHC, ISC and the other dispersion models described in this section and
listed in Table 2 are continually updated and the most recent version should be used.
As of April 15, 2003, the following models were identified as EPA preferred models in Appendix W
(Reference 94) and should be added to Table 2:
Buoyant Line and Point Source Model (BLP) - Gaussian model - industrial stationary line sources
CALPUFF - non-steady-state puff dispersion model – long range transport
Also, the following models should be removed from Table 2: CDM, RAM, UAM
For additional information and guidance on dispersion models, refer to the following publications:
40 CFR Chapter 1, Appendix W to Part 51 – Guideline on Air Quality Models (April 15, 2003
or the most recent edition.).
Contains recommendations and supporting information on the selection and applications of
air quality models.
Federal Register, Vol. 63, No. 70 (April 13, 1998), Emissions and Dispersion Modeling
System Policy for Airport Air Quality Analysis; Interim Guidance to FAA Orders 1050.1D and
5050.4A, DOT, FAA.
Provides an explanation of FAA’s policy on the application and use of EDMS for airport air
quality assessments.
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AIR QUALITY PROCEDURES FOR CIVILIAN AIRPORTS & AIR FORCE BASES
(THE "AIR QUALITY HANDBOOK")
ADDENDUM (Continued)
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