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5. CONFORMITY (p. 37)
i
i
i , FAA Community &
Environmental Needs Division and the &
5.1 (p. 38)
ity of the General
i
i
ity), above.
5.2 (p. 41)
i
ity), above.
5.3
ity
determi
ity), above.
5.3.1 (p. 42)
ity Rule.
ity), above.
5.3.2
luding the
ity), above.
Provides further explanation of the General and Transportation Conform ty Rules and gives the
regulatory citations.
For additional and updated information on the applicability of the General Conformity requirements
see the following:
40 CFR Parts 51 and 93, Determining Conform ty of General Federal Actions to State or
Federal Implementation Plans, Final Rule, U.S. EPA, November 30, 1993.
General Conform ty Guidance for Airports – Questions & Answers
U.S. EPA OAQPS, Air Quality Strategies
Standards Division (September 25, 2002).
Applicability
Discusses the basis, conditions and criteria for determining the applicabil
Conform ty Rule including nonattainment designation, exemptions, threshold emission levels and
regional significance; describes "direct" emissions and the concepts of "practicably control" and
"continuing program responsibility". Tables 3 & 4 provide a listing of threshold levels, by pollutant
and nonattainment/maintenance areas, below which a General Conform ty analysis is not required.
See information under Section 5 (Conform
Analysis
Discusses the conditions, or methods, for meeting the General Conform ty requirement
See information under Section 5 (Conform
Procedure (p. 42)
Provides clarification on the procedures for projects that do not require a General Conform
nation and the public notification requirements for projects that do.
See information under Section 5 (Conform
Conformity Steps Summary
Reviews the steps for considering the applicability of the General Conform
See information under Section 5 (Conform
Conformity and NEPA (p. 42)
Discusses the relationship between NEPA and General Conformity requirements inc
alternatives analysis.
See information under Section 5 (Conform
AD - 18
AIR QUALITY PROCEDURES FOR CIVILIAN AIRPORTS & AIR FORCE BASES
(THE "AIR QUALITY HANDBOOK")
ADDENDUM (Continued)
5.4 (p. 43)
ity.
ity), above.
6. (p. 45)
i
i
i as is the case
de i
) de minimis levels, then the
j
6.1 )
6.1.1 )
i
6.1.2
i
6.1.3 (p. 46)
i
References / Sources
Refers to EPA documents and other resources on General Conform
See information under Section 5 (Conform
MITIGATION / CONTROL MEASURES
Introduces the emission reduction measures that are discussed in this section.
It is important to note that although the title of this section is “Mitigation / Control Measures”, a more
appropriate title may be “Emission Reduction Measures” since “mitigation” is a specialized term in
the context of General Conformity. Under General Conformity, an emission reduction measure that
is a component of a proposed action and contributes to the action being below de min mis levels
(and the General Conformity Rule not applying), is an emission reduction measure rather than a
mitigation measure. Conversely, if a proposed action exceeds de min mis levels and the conformity
determination process is activated, then “mitigation measures” may be identified as part of the
General Conformity process. However, in this context, the mitigation measures “should be used to
reduce the emissions from the action down to zero and not just to below de min mis
when the Federal agency decides up front, before the action occurs, to reduce its emissions to
below min mis levels.” (U.S. Environmental Protection Agency, July 13, 1994. General
Conformity Guidance: Questions and Answers, Office of Air Quality Planning and Standards,
Question 29. Therefore, if a proposed project’s emissions exceed
project sponsors should consider redesigning the pro ect to avoid this to avoid this exceedance and
requirement to offset emissions to zero.
Aircraft (p. 45
Introduces the emission reduction measures that are discussed in this section.
No changes.
Single / Reduced Engine Taxiing (p. 45
Explains the applicability and limitations of this practice as a m tigation measure.
No changes.
Derate Takeoff Power (p. 46)
Explains the applicability and limitations of this m tigation measure.
No changes.
Reduce Use of Reverse Thrust
Explains the applicability and limitations of this practice as a m tigation measure.
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