Current through Register Vol. 35, No. 18, September 24, 2024
A. The analyses
required under 20.11.4 NMAC must be based on the latest planning assumptions.
(1) All planning assumptions (such as per
capita water and sewer use, vehicle miles traveled per capita or per household,
trip generation per household, vehicle occupancy, household size, vehicle fleet
mix, vehicle ownership, woodstoves per household, and the geographic
distribution of population growth) must be derived from the estimates of
population, employment, travel, and congestion most recently approved by the
MPO, or other agency authorized to make such estimates, where
available.
(2) Any revisions to
these estimates used as part of the conformity determination, including
projected shifts in geographic location or level of population, employment,
travel, and congestion, must be approved by the MPO or other agency authorized
to make such estimates for the urban area.
B. The analyses required under 20.11.4 NMAC
must be based on the latest and most accurate emission estimation techniques
available as described below, unless such techniques are inappropriate. If such
techniques are inappropriate, the federal agency may obtain written approval
from the regional administrator for EPA region VI for a modification or
substitution, of another technique on a case-by-case basis or, where
appropriate, on a generic basis for a specific federal agency program.
(1) For motor vehicle emissions, the most
current version of the motor vehicle emissions model specified by EPA and
available for use in the preparation or revision of the applicable SIP must be
used for the conformity analysis as specified in Subparagraph (a) and (b), of
Paragraph (1) of Subsection B of 20.11.4.159 NMAC:
(a) the EPA must publish in the federal
Register a notice of availability of any new motor vehicle emissions model;
and
(b) a grace period of three
months shall apply during which the motor vehicle emissions model previously
specified by EPA as the most current version may be used unless EPA announces a
longer grace period in the federal register. Conformity analyses for which the
analysis was begun during the grace period or no more than three months before
the federal register notice of availability of the latest emission model may
continue to use the previous version of the model specified by EPA.
(2) For non-motor vehicle sources,
including stationary and area source emissions, the latest emission factors
specified by EPA in the
Compilation of Air Pollutant Emission Factors
(AP-42,
http://www.epa.gov/ttn/chiefs/efpac
) must be used for the conformity analysis unless more accurate emission data
are available, such as actual stack test data from stationary sources which are
part of the conformity analysis.
C. The air quality modeling analyses required
under 20.11.4 NMAC must be based on the applicable air quality models, data
bases, and other requirements specified in the most recent version of the
Guideline on Air Quality Models (Appendix W to 40 CFR Part 51
), unless:
(1) the guideline techniques are
inappropriate, in which case the model may be modified or another model
substituted on a case-by-case basis or, where appropriate, on a generic basis
for a specific federal agency program; and
(2) written approval of the EPA regional
administrator is obtained for any modification or substitution.
D. The analyses required under
20.11.4 NMAC, must be based on the total of direct and indirect emissions from
the action and must reflect emission scenarios that are expected to occur under
each of the following cases:
(1) The
attainment year specified in the SIP, or if the SIP does not specify an
attainment year, the latest attainment year possible under the act;
or
(2) the last year for which
emissions are projected in the maintenance plan;
(3) the year during which the total of direct
and indirect emissions from the action is expected to be the greatest on an
annual basis; and
(4) any year for
which the applicable SIP specifies an emissions budget.
