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particulate matter as well as the category of compounds called hydrocarbons.
In the Equation 1: Dispersion Modeling Threshold (pg. 20), the term “LTOs” should be changed to
“Operations (000)”.
For clarification, a Landing & Takeoff Operation (LTO) is the combination of one arrival and one
departure whi e an “operation” is an arrival or departure; therefore one LTO equals two operations.
Airport Activ ty Threshold For NAAQS Assessment should be used with discretion
determine if a NAAQS assessment is necessary. When determ ning if an analysis is necessary, the
area attainment / non-attainment status, the project’s general conformity approach and/or state or local
regulatory agency requirements are among the other factors that should be considered.
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AIR QUALITY PROCEDURES FOR CIVILIAN AIRPORTS & AIR FORCE BASES
(THE "AIR QUALITY HANDBOOK")
ADDENDUM (Continued)
2.3.5 (p. 21)
i or not
mi
i st para., 6th
l l i ( ) i i i
l ),
3. EMISSI (p. 23)
3.1 (p. 23)
.
3.2 (p. 24)
3.2.1 (p. 24)
th
st
.
3.2.2
3.2.3 (p. 25)
NAAQS Assessment - Roadway Intersection Analysis
Provides and discusses roadway facility operational measures for determ ning whether
croscale atmospheric dispersion analysis is required or recommended.
For additional clarification to the approach provided n the Handbook (see 1 sentence) the
following should also be considered:
Critical intersections are sometimes defined as those where the project increases total traffic by 10
percent or more and the eve -of-serv ce LOS s forecast to be D, E, or F. Of the ntersect ons
meeting these criteria, a subset of the highest ranked “worst-case” intersections could be selected for
the initial analysis. This ranking shou d consider the total traffic volume (project and background
intersection LOS, and the proximity of air quality sensitive receptors. Should the initial modeling
indicate that there is no likelihood of a violation of the NAAQS for CO, then no additional analysis is
considered necessary.
ONS ASSESSMENT
No changes.
Introduction
Discusses the purpose and use of emissions inventory and defines "direct" and "indirect" emissions.
No changes
Emission Sources
No changes.
Aircraft
Provides general discussion of ground-based and airborne aircraft operational characteristics
Reference to mixing zone (pg. 24, 5 para.) should be enhanced with the following:
For airport emission inventories, a mixing height of 3,000 feet above ground level (representing the
annual average mixing height in the contiguous United States) is generally assumed although lower
values can be used based on local meteorological conditions (Reference 97, Reference 82).
Reference to FAA’s Aircraft Engine Emission Database (pg. 25, 1 para., last sentence) should be
replaced with the ICAO Engine Emissions Database Bank
Auxiliary Power Units (p. 25)
Provides general discussion of APU utilization.
No changes.
Ground Support Equipment or Aerospace Ground Equipment
Identifies the typical types and functions of GSE and identifies the appropriate model for calculating
emissions.
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AIR QUALITY PROCEDURES FOR CIVILIAN AIRPORTS & AIR FORCE BASES
(THE "AIR QUALITY HANDBOOK")
ADDENDUM (Continued)
i
l
3.2.4 (p. 26)
icati i
following:
The PART5 l
PART5 is
MOBILE6 .
(See also the EDMS
).
3.2.5 (p. 26)
3.2.6 )
l
ity Rule.
Note that the Emissions D spersion Modeling System (EDMS) contains data derived from the EPA
Draft NONROAD model (Reference 103). (See also the EDMS Reference Manua (Reference 98) for
additional information).
Ground Access Vehicles
Gives classif ons for motor vehicle types and discusses on- verses off-site tr ps.
The information contained in the last paragraph of this section should also acknowledge the
Emissions and Dispersion Modeling System (EDMS), MOBILE, EMFAC and mode s are
continually updated and the most recent or appropriate version should be used. Note that
now part of and is no longer updated as a separate model However, in some
applications the most appropriate version is the one used in the support of the State Implementation
Plan, which may not be the most recent version.
It is also noteworthy that EDMS is designed to provide an inventory of motor vehicle emissions and
includes default emission factors based on MOBILE standard (or typical) input factors for the fleet
mix, ambient temperature, emission control equipment and requirements, etc. For a more detailed,
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