Document ID: EPA-R09-OAR-2019-0541-0001
Agency: epa
Document Type: Proposed Rule
Title: Air Quality State Implementation Plans; Approvals and Promulgations: Arizona: Phoenix-Mesa 2008 8-Hour Ozone Nonattainment Area Requirements
Posted Date: 2019-10-03T04:00Z

[Federal Register Volume 84, Number 192 (Thursday, October 3, 2019)]
[Proposed Rules]
[Pages 52838-52850]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-21468]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[EPA-R09-OAR-2019-0541; FRL-10000-65-Region 9]

Clean Air Plans; 2008 8-Hour Ozone Nonattainment Area 
Requirements; Phoenix-Mesa, Arizona

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

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SUMMARY: The Environmental Protection Agency (EPA) is proposing action 
on a state implementation plan (SIP) revision submitted by the State of 
Arizona on behalf of the Maricopa Association of Governments (MAG) to 
meet Clean Air Act (CAA or ``the Act'') requirements for the 2008 ozone 
national ambient air quality standards (NAAQS or ``standards'') in the 
Phoenix-Mesa (``Phoenix'') ozone nonattainment area. The EPA is 
proposing to approve the portions of the ``MAG 2017 8-Hour Ozone 
Moderate Area Plan'' (``MAG 2017 Ozone Plan'' or ``Plan'') that address 
the requirements for emissions inventories, a demonstration of 
attainment by the applicable attainment date, reasonably available 
control measures, reasonable further progress (RFP), motor vehicle 
emission budgets for transportation conformity, vehicle inspection and 
maintenance programs, new source review rules, and offsets. The EPA is 
proposing to disapprove the portion of the MAG 2017 Ozone Plan that 
addresses the requirements for contingency measures for failure to 
attain or to make RFP. However, based on a separate proposed action 
finding that the Phoenix nonattainment area attained the 2008 ozone 
standard by the applicable attainment date, we are also proposing to 
determine that the requirement for contingency measures will no longer 
apply to the Phoenix nonattainment area. Finally, we are proposing to 
approve the portions of a

[[Page 52839]]

SIP revision, the ``2014 Eight-Hour Ozone Plan--Submittal of Marginal 
Area Requirements for the Maricopa Nonattainment Area (June 2014)'' 
(``MAG 2014 Ozone Plan''), on which we previously deferred action.

DATES: Written comments must arrive on or before November 4, 2019.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R09-
OAR-2019-0541 at https://www.regulations.gov. For comments submitted at 
Regulations.gov, follow the online instructions for submitting 
comments. Once submitted, comments cannot be edited or removed from 
Regulations.gov. The EPA may publish any comment received to its public 
docket. Do not submit electronically any information you consider to be 
Confidential Business Information (CBI) or other information whose 
disclosure is restricted by statute. Multimedia submissions (audio, 
video, etc.) must be accompanied by a written comment. The written 
comment is considered the official comment and should include 
discussion of all points you wish to make. The EPA will generally not 
consider comments or comment contents located outside of the primary 
submission (i.e., on the web, cloud, or other file sharing system). For 
additional submission methods, please contact the person identified in 
the FOR FURTHER INFORMATION CONTACT section. For the full EPA public 
comment policy, information about CBI or multimedia submissions, and 
general guidance on making effective comments, please visit http://www.epa.gov/dockets/commenting-epa-dockets.

FOR FURTHER INFORMATION CONTACT: Nancy Levin, EPA Region IX, 75 
Hawthorne Street, San Francisco, CA 94105. Phone: (415) 972-3848 or by 
email at levin.nancy@epa.gov.

SUPPLEMENTARY INFORMATION: Throughout this document, ``we,'' ``us,'' 
and ``our'' refer to the EPA.

Table of Contents

I. Regulatory Context
    A. Ozone Standards, Area Designations, and SIPs
    B. The Phoenix 2008 Ozone Nonattainment Area
II. Submission From the State of Arizona To Address 2008 Ozone 
Requirements in the Phoenix Nonattainment Area
    A. Summary of Submission
    B. Clean Air Act Procedural Requirements for Adoption and 
Submission of SIP Revisions
III. Evaluation of the MAG 2017 Ozone Plan
    A. Emissions Inventories
    B. Reasonably Available Control Measures Demonstration and 
Control Strategy
    C. Attainment Demonstration
    D. Reasonable Further Progress Demonstration
    E. Contingency Measures in the Event of Failure To Make 
Reasonable Further Progress or Attain
    F. Motor Vehicle Emissions Budgets for Transportation Conformity
    G. Vehicle Inspection and Maintenance
    H. New Source Review Rules
    I. Offset Requirements
IV. Proposed Action
V. Statutory and Executive Order Reviews

I. Regulatory Context

A. Ozone Standards, Area Designations, and SIPs

    Ground-level ozone is formed when oxides of nitrogen 
(NOX) and volatile organic compounds (VOC) react in the 
presence of sunlight. These two pollutants, referred to as ozone 
precursors, are emitted by many types of pollution sources, including 
on- and off-road motor vehicles and engines, power plants and 
industrial facilities, and smaller area sources such as lawn and garden 
equipment and paints.
    Scientific evidence indicates that adverse public health effects 
occur following exposure to ozone, particularly in children and adults 
with lung disease. Breathing air containing ozone can reduce lung 
function and inflame airways, which can increase respiratory symptoms 
and aggravate asthma or other lung diseases. Ozone exposure also has 
been associated with increased susceptibility to respiratory 
infections, medication use, doctor visits, and emergency department 
visits and hospital admissions for individuals with lung disease. Ozone 
exposure also increases the risk of premature death from heart or lung 
disease. Children are at increased risk from exposure to ozone because 
their lungs are still developing, and they are more likely to be active 
outdoors, which increases their exposure.\1\ In 1979, under CAA section 
109, the EPA established primary and secondary NAAQS for ozone at 0.12 
parts per million (ppm) averaged over a 1-hour period.\2\
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    \1\ ``Fact Sheet-2008 Final Revisions to the National Ambient 
Air Quality Standards for Ozone'' dated March 2008 and 75 FR 2938 
(January 19, 2010).
    \2\ 44 FR 8202 (February 8, 1979).
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    On July 18, 1997, the EPA revised the primary and secondary NAAQS 
for ozone to 0.08 ppm, averaged over an 8-hour period (``1997 ozone 
standard'').\3\ The EPA set the 1997 ozone standard based on scientific 
evidence demonstrating that ozone causes adverse health effects at 
lower concentrations and over longer periods of time than was 
understood when the pre-existing 1-hour ozone standard was set. The EPA 
determined that the 1997 ozone standard would be more protective of 
human health, especially of children and adults who are active 
outdoors, and individuals with a pre-existing respiratory disease, such 
as asthma.
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    \3\ 62 FR 38856 (July 18, 1997).
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    On March 12, 2008, the EPA revised the primary and secondary NAAQS 
for ozone to 0.075 ppm (annual fourth-highest daily maximum 8-hour 
concentration, averaged over 3 years) (``2008 ozone standard'').\4\ The 
EPA set the 2008 ozone standard based on scientific evidence 
demonstrating that ozone causes adverse health effects at lower 
concentrations and over longer periods of time than was understood when 
the pre-existing 1997 ozone standard was set. The EPA determined that 
the 2008 ozone standard would be more protective of human health, 
especially of children and adults who are active outdoors, and 
individuals with a pre-existing respiratory disease, such as asthma.
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    \4\ 73 FR 16436 (March 27, 2008). Since the 2008 primary and 
secondary NAAQS for ozone are identical, for convenience, we refer 
to both as ``the 2008 ozone NAAQS'' or ``the 2008 ozone standard.''
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    In accordance with section 107(d) of the CAA, the EPA must 
designate an area ``nonattainment'' if it is violating the NAAQS or if 
it is contributing to a violation of the NAAQS in a nearby area. On May 
21, 2012, the EPA designated areas of the country with respect to the 
2008 ozone standard.\5\
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    \5\ 77 FR 30087 and 40 CFR 81.330.
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    The EPA proposed the 2008 ozone standard SIP Requirements Rule 
(``2008 Ozone SRR'' or SRR) on June 6, 2013 \6\ and finalized the SRR 
on March 6, 2015,\7\ effective April 6, 2015. The SRR promulgated 
implementation requirements for the 2008 ozone NAAQS and revoked the 
1997 ozone standard.\8\ The rule is codified at 40 CFR part 51, subpart 
AA. The SRR was challenged by various parties, and on February 16, 
2018, the U.S. Court of Appeals for the D.C. Circuit published its 
decision in South Coast Air Quality Management. District v. EPA \9\ 
(``South Coast II'') \10\ vacating portions of the

[[Page 52840]]

2008 Ozone SRR. The South Coast II decision does not affect this 
proposed action.
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    \6\ 78 FR 34178.
    \7\ 80 FR 12264, codified at 40 CFR part 51, subpart AA.
    \8\ The SRR revokes the 1997 ozone NAAQS, but not all of the 
requirements for implementing the 1997 ozone NAAQS.
    \9\ South Coast Air Quality Management District v. EPA, 882 F.3d 
1138 (D.C. Cir. 2018) (``South Coast II'').
    \10\ The term ``South Coast II'' is used in reference to the 
2018 court decision to distinguish it from a decision published in 
2006 also referred to as ``South Coast.'' The earlier decision 
involved a challenge to the EPA's Phase 1 implementation rule for 
the 1997 ozone NAAQS. South Coast Air Quality Management Dist. v. 
EPA, 472 F.3d 882 (D.C. Cir. 2006).
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    On October 1, 2015, the EPA strengthened the primary and secondary 
8-hour ozone NAAQS to 0.070 ppm (annual fourth-highest daily maximum 8-
hour concentration, averaged over 3 years).\11\ Today's action only 
applies to the 2008 ozone standard and does not address requirements of 
the 2015 ozone standard.
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    \11\ 80 FR 65292.
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    In Arizona, the Arizona Department of Environmental Quality (ADEQ 
or ``State'') is the state agency responsible for the adoption and 
submission of SIP revisions to the EPA. In the Phoenix nonattainment 
area, MAG develops and adopts air quality management plans to address 
CAA planning requirements applicable to that region. MAG submits those 
plans to ADEQ, which in turn adopts and submits the plans to the EPA.

B. The Phoenix 2008 Ozone Nonattainment Area

    The EPA designated the Phoenix area as nonattainment for the 2008 
ozone standard on May 21, 2012, effective July 20, 2012.\12\ The 
Phoenix nonattainment area, which includes a portion of Maricopa County 
and a portion of Pinal County, was classified by operation of law as 
``Marginal'' nonattainment \13\ and became subject to Marginal 
nonattainment area requirements under the CAA.\14\ On July 2, 2014, 
ADEQ submitted the MAG 2014 Ozone Plan.
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    \12\ 77 FR 30088.
    \13\ 40 CFR 81.303.
    \14\ See section 172, ``Nonattainment plan provisions,'' and 
subpart 2, ``Additional Provisions for Ozone Nonattainment Areas,'' 
sections 181 and 182(a).
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    On October 16, 2015, the EPA took direct final action to approve 
the MAG 2014 Ozone Plan with respect to the requirements of CAA section 
182(a)(1) (Base Year Emissions Inventory), 182(a)(2)(A) (Reasonably 
Available Control Technology Corrections), and 182(a)(2)(B) (Vehicle 
Inspection and Maintenance Programs), and 182(a)(3)(B) (Emissions 
Statements).\15\ We deferred action with respect to the requirements of 
CAA sections 176(c) (Transportation Conformity), 182(a)(2)(C) (Permit 
Programs) and 182(a)(4) (General Offset Requirement).
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    \15\ 80 FR 62457.
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    On August 27, 2015, the EPA proposed to reclassify the Phoenix 
nonattainment area as ``Moderate'' nonattainment for the 2008 ozone 
NAAQS because the area failed to attain the 2008 ozone standard by the 
Marginal area attainment deadline of July 20, 2015.\16\ The EPA 
finalized this action on May 4, 2016.\17\ As a result of this 
reclassification to Moderate nonattainment, the Phoenix nonattainment 
area, already subject to Marginal Area requirements, became subject to 
additional requirements, including: A reasonably available control 
measures (RACM) demonstration; an attainment demonstration; an RFP 
demonstration; contingency measures to provide for RFP and attainment; 
motor vehicle emission budgets (MVEB or ``budgets'') for transportation 
conformity; and Moderate area vehicle inspection and maintenance (I/M) 
provisions.\18\ SIP revisions addressing these requirements \19\ were 
due to the EPA by January 1, 2017.\20\
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    \16\ 80 FR 51992.
    \17\ 81 FR 26697.
    \18\ CAA section 182(b).
    \19\ We note that the EPA discontinued the ``Stage II Vapor 
Recovery Program'' required under CAA section 182(b)(3). 80 FR 70689 
(November 16, 2015).
    \20\ 80 FR 51992, 51999.
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II. Submission From the State of Arizona To Address 2008 Ozone 
Requirements in the Phoenix Nonattainment Area

A. Summary of Submission

    On December 13, 2016, in response to the area's reclassification to 
Moderate nonattainment for the 2008 ozone standard, ADEQ adopted the 
MAG 2017 Ozone Plan, which had previously been adopted by MAG and 
forwarded to ADEQ for adoption and submittal to the EPA. ADEQ submitted 
the MAG 2017 Ozone Plan to the EPA as a revision to the Arizona SIP on 
December 19, 2016.
    The MAG 2017 Ozone Plan submittal consists of documents developed 
by MAG and the Maricopa County Air Quality District (MCAQD). The plan 
addresses the requirements for emissions inventories, air quality 
modeling demonstrating attainment of the 2008 ozone standard by the 
applicable attainment year, provisions demonstrating implementation of 
RACM, and a demonstration of RFP, among other requirements.

B. Clean Air Act Procedural Requirements for Adoption and Submission of 
SIP Revisions

    CAA section 110(a)(1) and (2), and 110(l) require states to provide 
reasonable notice and opportunity for public hearing prior to the 
adoption and submission of a SIP or SIP revision. To meet this 
requirement, every SIP submittal must include evidence that adequate 
public notice was given and an opportunity for a public hearing was 
provided consistent with the EPA's implementing regulations in 40 CFR 
51.102.
    Section 110(k)(1)(B) requires the EPA to determine whether a SIP 
submittal is complete within 60 days of receipt. Any plan that we have 
not affirmatively determined to be complete or incomplete will become 
complete six months after the day of submittal by operation of law. A 
finding of completeness starts a 12-month clock for the EPA to act on 
the SIP submittal.\21\ ADEQ's submittal documents the public review 
process followed by MAG and ADEQ in adopting the MAG 2017 Ozone Plan 
prior to submittal to the EPA as a revision to the SIP .\22\ The public 
hearing was held October 17, 2016, at the MAG offices in Phoenix.\23\ 
In addition, ADEQ's submittal documents the adoption of the MAG 2017 
Ozone Plan by the MAG Regional Council and authorization to submit the 
plan to ADEQ and the EPA on December 7, 2016.\24\ On December 19, 2016, 
ADEQ submitted to the EPA the MAG 2017 Ozone Plan and requested its 
approval into the Arizona SIP.\25\
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    \21\ CAA section 110(k)(2).
    \22\ Plan Appendix C Exhibit 1--Public Hearing Process 
Demonstration.
    \23\ Id.
    \24\ Plan Appendix C, Exhibit 2: Certification of Adoption and 
MAG Authority for Regional Air Quality Planning.
    \25\ See letter dated December 13, 2016, from Timothy S. 
Franquist, ADEQ, to Alexis Strauss, EPA, which was submitted 
electronically to the EPA with the MAG 2017 Ozone Plan on December 
19, 2019.
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    Based on the documentation included in ADEQ's submittal, we find 
that the MAG 2017 Ozone Plan satisfies the procedural requirements of 
sections 110(a)(1), 110(a)(2) and 110(l) of the Act requiring states to 
provide reasonable notice and opportunity for public hearing prior to 
adoption of SIP revisions. The MAG 2017 Ozone Plan became complete by 
operation of law on June 19, 2017, pursuant to section 110(k)(1)(B).
    We previously found that the MAG 2014 Ozone Plan also satisfied the 
procedural requirements of sections 110(a)(1) and 110(l) of the 
Act.\26\ The MAG 2014 Ozone Plan became complete by operation of law on 
January 2, 2015, pursuant to section 110(k)(1)(B).
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    \26\ 80 FR 62457, 62458.

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[[Page 52841]]

III. Evaluation of the MAG 2017 Ozone Plan

A. Emissions Inventories

1. Statutory and Regulatory Requirements and Guidance
    Sections 172(c)(3) and 182(a)(1) of the CAA require states to 
submit for each ozone nonattainment area a ``base year inventory'' that 
is a comprehensive, accurate, current inventory of actual emissions 
from all sources of the relevant pollutant or pollutants in the area. 
The 2008 Ozone SRR requires that the inventory year be selected 
consistent with the baseline year for the RFP demonstration, which is 
the most recent calendar year for which a complete triennial inventory 
is required to be submitted to the EPA under the Air Emissions 
Reporting Requirements.\27\
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    \27\ 2008 Ozone SRR at 40 CFR 51.1115(a) and the Air Emissions 
Reporting Requirements at 40 CFR part 51 subpart A.
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    In addition, CAA section 182(a)(3)(A) and the 2008 Ozone SRR at 40 
CFR 51.1115(b) require states to submit a periodic emissions inventory 
of emissions sources in each ozone nonattainment by the end of each 3-
year period after the required submission of the base year inventory 
for the nonattainment area. Finally, although not expressly required by 
the CAA, future year emissions inventories are also necessary for 
photochemical modeling to demonstrate attainment, as well as to 
demonstrate RFP.
    The EPA has issued guidance on the development of base year, 
periodic, and future year emissions inventories for 8-hour ozone and 
other pollutants.\28\ Emissions inventories for ozone must include 
emissions of VOC and NOX and represent emissions for a 
typical ozone season weekday.\29\ States should include documentation 
explaining how the emissions data were calculated. In estimating mobile 
source emissions, states should use the latest emissions models and 
planning assumptions available at the time the SIP is developed.\30\
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    \28\ ``Emissions Inventory Guidance for Implementation of Ozone 
and Particulate Matter National Ambient Air Quality Standards 
(NAAQS) and Regional Haze Regulations,'' EPA-454/B-17-002, May 2017. 
At the time the MAG 2017 Ozone Plan was developed, the following EPA 
emissions inventory guidance applied: ``Emissions Inventory Guidance 
for Implementation of Ozone and Particulate Matter National Ambient 
Air Quality Standards (NAAQS) and Regional Haze Regulations'' EPA-
454-R-05-001, November 2005.
    \29\ 40 CFR 51.1115(a) and (c), and 40 CFR 51.1100(bb) and (cc).
    \30\ 80 FR 12264, at 12290 (March 6, 2015).
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2. Summary of the State's Submission
    The MAG 2017 Ozone Plan includes a base year (2011) inventory,\31\ 
a periodic (2014) inventory,\32\ and a future (attainment) year (2017) 
inventory.\33\
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    \31\ MAG 2017 Ozone Plan, Appendix A, Exhibit 1.
    \32\ Id. Appendix A, Exhibit 2.
    \33\ Id. Appendix A to Appendix B, Exhibit 1, (``Modeling 
Protocol''), section 6.2.
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3. The EPA's Evaluation
    Based in part on a supplemental ``recast'' ozone season-day 
emissions inventory for June-August, we previously approved the 2011 
base year inventory submitted with MAG's 2014 Ozone Plan as meeting the 
requirements of CAA section 182(a)(1) and 40 CFR 51.1115.\34\ We 
recommended that this revised 2011 ozone season-day emission inventory 
be included as part of the Moderate area SIP revision.\35\ This 
inventory is included as part of Appendix A, Exhibit 1 in the MAG 2017 
Ozone Plan. Based on the evaluation in that previous approval, we find 
that this revised inventory meets the requirements of CAA section 
182(a)(1).
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    \34\ 80 FR 62457, 62459.
    \35\ Id.
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    The 2014 periodic inventory generally follows the same approach as 
the 2011 inventory. Accordingly, we propose to find that it meets the 
requirements of CAA section 182(a)(3)(A) and 40 CFR 51.1115.
    With respect to the 2017 modeling emissions inventory, we have 
reviewed the growth and control factors and find them acceptable and 
conclude that the future emissions projections in the MAG 2017 Ozone 
Plan reflect appropriate calculation methods. For further discussion of 
the future year 2017 modeling emissions inventory, see section III.C. 
of this notice (``Attainment Demonstration'').

B. Reasonably Available Control Measures Demonstration and Control 
Strategy

1. Statutory and Regulatory Requirements and Guidance
    CAA section 172(c)(1) requires that each attainment plan provide 
for the implementation of all RACM as expeditiously as practicable 
(including such reductions in emissions from existing sources in the 
area as may be obtained through implementation of reasonably available 
control technology (RACT)) \36\ and provide for attainment of the 
NAAQS. The 2008 Ozone SRR requires that, for each nonattainment area 
required to submit an attainment demonstration, the state concurrently 
submit a SIP revision demonstrating that it has adopted all RACM 
necessary to demonstrate attainment as expeditiously as practicable and 
to meet any RFP requirements.\37\
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    \36\ For ozone nonattainment areas classified as Moderate or 
above, CAA section 182(b)(2) also requires implementation of RACT 
for all major sources of VOC and for each VOC source category for 
which the EPA has issued a Control Techniques Guideline. CAA section 
182(f) requires that RACT under section 182(b)(2) also apply to 
major stationary sources of NOX. ADEQ has submitted 
separate SIP revisions to address these requirements. We are not 
addressing the section 182 RACT requirements in today's proposed 
rule.
    \37\ 40 CFR 51.1112(c).
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    In the preamble to final SRR, the EPA explained that we would 
continue to apply existing RACM guidance to the 2008 ozone NAAQS.\38\ 
In particular, the EPA has previously provided guidance interpreting 
the RACM requirement in the General Preamble for the Implementation of 
the Clean Air Act Amendments of 1990 and in a memorandum entitled 
``Guidance on the Reasonably Available Control Measure Requirement and 
Attainment Demonstration Submissions for Ozone Nonattainment Areas.'' 
\39\ Consistent with this existing guidance, we interpret the RACM 
provision to require a demonstration that the state has adopted all 
reasonable measures (including RACT) to meet RFP requirements and to 
demonstrate attainment as expeditiously as practicable and thus that no 
additional measures that are reasonably available will advance the 
attainment date or contribute to RFP for the area.\40\ States should 
consider all available measures, including those being implemented in 
other areas, but are only required to adopt measures that are 
economically and technologically feasible and will advance the 
attainment date or are necessary for RFP.\41\ Any measures that are 
necessary to meet these requirements that are not already either 
federally promulgated, or part of the state's SIP, or otherwise 
creditable in the SIP, must be submitted in enforceable form as part of 
the state's attainment plan for the area.
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    \38\ 80 FR 12264, 12282.
    \39\ See General Preamble, 57 FR 13498 at 13560 (April 16, 1992) 
and Memorandum dated November 30, 1999, from John Seitz, Director, 
OAQPS, to Regional Air Directors, titled ``Guidance on the 
Reasonably Available Control Measure Requirement and Attainment 
Demonstration Submissions for Ozone Nonattainment Areas.''
    \40\ 80 FR 12264, 12282.
    \41\ Id.
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    CAA section 172(c)(6) requires that nonattainment area plans 
include enforceable emissions limitations, and such other control 
measures, means or techniques (including economic incentives such as 
fees, marketable permits, and auctions of emission

[[Page 52842]]

rights), and schedules and timetables for compliance, as may be 
necessary or appropriate to provide for timely attainment of the 
NAAQS.\42\ Under the 2008 Ozone SRR, all control measures needed for 
attainment must be implemented no later than the beginning of the 
attainment year ozone season.\43\ The attainment year ozone season is 
defined as the ozone season immediately preceding a nonattainment 
area's maximum attainment date.\44\
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    \42\ See also CAA section 110(a)(2)(A).
    \43\ 40 CFR 51.1108(d).
    \44\ 40 CFR 51.1100(h).
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2. Summary of the State's Submission
    MAG addresses RACM requirements in Chapter Four, ``Evaluation of 
Control Measure Requirements in the Clean Air Act.'' To identify RACM, 
MAG reviewed existing control measures for ozone precursors in the 
Phoenix nonattainment area and compared them to the EPA's Menu of 
Control Measures (MCM) \45\ and to VOC and NOX rules in the 
Sacramento Metropolitan Air Quality Management District (SMAQMD).\46\ 
In Table 4-1 of the MAG 2017 Ozone Plan, MAG lists 93 existing ozone 
control measures and the dates that they were approved by the EPA. In 
the years prior to the adoption of the MAG 2017 Ozone Plan, MAG 
developed and the EPA approved comprehensive plans to provide for 
attainment of the NAAQS for carbon monoxide (e.g., Revised MAG 1999 
Serious Area Carbon Monoxide Plan) \47\ and ozone (e.g., 2000 Ozone 
Plan for the 1-hour ozone NAAQS, 2007 Ozone Plan for the 1997 ozone 
NAAQS, and 2009 Redesignation Request and Maintenance Plan for the 1997 
ozone NAAQS).\48\ These plans, and other actions, have resulted in the 
adoption of new rules and amendments to existing rules for stationary, 
area, and mobile sources, many of which are listed in Table 4-1 of the 
Plan.
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    \45\ https://www.epa.gov/air-quality-implementation-plans/menu-control-measures-naaqs-implementation. The Menu of Control Measures 
for NAAQS Implementation provides state, local and tribal air 
agencies with information on existing emissions reduction measures 
and relevant information concerning the efficiency and cost 
effectiveness of the measures. The MCM is intended to provide a 
broad, though not comprehensive, listing of potential emissions for 
direct PM2.5 and ozone precursors, for use as an initial 
screening step.
    \46\ The Sacramento metropolitan area is classified as ``Severe-
15'' for the 2008 ozone NAAQS.
    \47\ 70 FR 11553 (March 9, 2005).
    \48\ 70 FR 34362 (June 14, 2005), 77 FR 35285 (June 13, 2012), 
79 FR 55645 (September 17, 2014).
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    When comparing the existing measures in the Phoenix nonattainment 
area with the MCM, MAG generally finds the following: (1) MCAQD has 
adopted rules that have equivalent controls; (2) the controls apply to 
sources that are not present in the nonattainment area (e.g., cement 
kilns, Fluid Catalytic Cracking Units, glass manufacturing); and/or (3) 
the controls are not necessary for attainment or RFP and will not 
advance the attainment date.\49\ When comparing the existing measures 
with SMAQMD NOX and VOC rules, MAG finds the following: 
MCAQD has adopted rules that have equivalent controls (e.g., Rule 348, 
Aerospace Manufacturing and Rework Operations; Rule 337, Graphic Arts; 
and Rule 331, Solvent Cleaning) and/or additional controls are not 
necessary for attainment or RFP and will not advance the attainment 
date.\50\ With respect to the Pinal County portion of the Phoenix 
nonattainment area, MAG notes the following: There are no major sources 
of NOX and VOC; the RACT rules for the only two source 
categories subject to RACT requirements, gas stations and a metal 
surface coating operation, are currently being updated; and the few 
remaining permitted stationary sources in the Pinal County portion of 
the nonattainment area have negligible emissions in comparison to total 
anthropogenic emissions in the nonattainment area.\51\ MAG also 
concludes that additional controls beyond those required by existing 
rules are not necessary for expeditious attainment or RFP because 
modeling indicates that the existing control measures are sufficient to 
demonstrate attainment as expeditiously as practicable and to make RFP. 
In addition, MAG notes that any new or strengthened measures could not 
be implemented in time to advance the attainment date.
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    \49\ Plan, Table 4-2.
    \50\ Plan, Table 4-3.
    \51\ Plan, 4-2-4-3.
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    MAG describes the overall control strategy for the Phoenix ozone 
nonattainment area in Chapter 5 of the Plan. In Table 5-1 of the Plan 
MAG lists 93 existing and approved federal, state, and local ozone 
control measures in the Phoenix nonattainment area. Out of these 93 
measures, MAG identifies 13 measures with quantifiable emissions 
reduction benefits.\52\ Table 1 lists these 13 measures.
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    \52\ Plan, 5-12.

                     Table 1--Control Measures Used for Numeric Emissions Reductions Credit
----------------------------------------------------------------------------------------------------------------
            Rule Title                Source category                   Citation for EPA approval
----------------------------------------------------------------------------------------------------------------
Long-Term Fuel Reformulation:      Onroad/Nonroad......  70 FR 11553 (March 9, 2005).
 From and After May 1, 1999.
Phased-In Emission Test Cutpoints  Onroad..............  70 FR 11553 (March 9, 2005).
One-Time Waiver from Vehicle       Onroad..............  70 FR 11553 (March 9, 2005).
 Emissions Test.
Tougher Enforcement of Vehicle     Onroad..............  70 FR 11553 (March 9, 2005).
 Registration and Emissions Test
 Compliance.
Expansion of Area A boundaries...  Onroad/Nonroad/Area.  70 FR 11553 (March 9, 2005).
Gross Polluter Option for I/M      Onroad..............  70 FR 11553 (March 9, 2005).
 Program Waivers.
Coordinate Traffic Signal Systems  Onroad..............  70 FR 11553 (March 9, 2005).
Develop Intelligent                Onroad..............  70 FR 11553 (March 9, 2005).
 Transportation Systems.
Federal Tier 2 Motor Vehicle       Onroad..............  65 FR 6697 (February 2, 2000);
 Emissions Standards and Gasoline                        79 FR 23413 (April 28, 2014).
 Sulfur Control Requirements;
 Federal Tier 3 Motor Vehicle
 Emission and Fuel Standards.
Federal Phase 1 Greenhouse Gas     Onroad..............  76 FR 57105 (September 15, 2011);
 Emissions Standards and Fuel                            75 FR 25323 (May 7, 2010);
 Efficiency Standards for Medium-                        77 FR 62623 (October 15, 2012).
 and Heavy-Duty Engines and
 Vehicles; Phase 1 and Phase 2
 Light-Duty Vehicle Greenhouse
 Gas Emissions and Corporate
 Average Fuel Economy Standards.
Federal Nonroad Equipment          Nonroad.............  69 FR 38957 (June 29, 2004);
 Emissions Standards (Control of                         63 FR 56968 (October 23, 1998);
 Emissions of Air Pollution From                         73 FR 59033 (October 8, 2008).
 Nonroad Diesel Engines and Fuel;
 Control of Emissions of Air
 Pollution From Nonroad Diesel
 Engines; Control of Emissions
 From Nonroad Spark-Ignition
 Engines and Equipment).
Federal Heavy-Duty Diesel Vehicle  Onroad..............  66 FR 5001 (January 18, 2001;
 Emissions Standards (Control of                         77 FR 35285 (June 13, 2012).
 Air Pollution from New Motor
 Vehicles: Heavy-Duty Engine and
 Vehicle Standards and Highway
 Diesel Fuel Sulfur Control
 Requirements).

[[Page 52843]]

 
Control of Hazardous Air           Onroad/Area.........  72 FR 8427 (February 26, 2007).
 Pollutants From Mobile Sources
 (including VOCs from portable
 gas cans).
----------------------------------------------------------------------------------------------------------------
Source: Plan, 5-12-5-18.

    MAG states that the first 12 measures listed in Table 1 will result 
in onroad and nonroad emissions reductions.\53\ Specifically, MAG 
states that the measures will produce onroad reductions, on an average 
ozone season day in 2017, of 25.3 metric tons per day (tpd) of VOC and 
54.5 metric tpd of NOX. MAG states that the nonroad mobile 
source emissions reductions in 2017 for these 12 measures are 7.6 
metric tpd of VOC and 17.3 metric tpd of NOX. MAG states 
that the final measure listed in Table 1 (Control of Hazardous Air 
Pollutants From Mobile Sources) will result in 6.2 metric tpd of VOC 
reductions on an average ozone season day. MAG notes that MCAQD and the 
Pinal County Air Quality Control District (PCAQCD) separately prepared 
RACT analyses to meet the requirements of CAA sections 182(b)(2) and 
182(f). However, MAG did not include reductions from RACT rules in the 
RACM determination and the attainment demonstration (described in 
section III.B of this notice) because it determined that RACT-related 
reductions were not necessary for expeditious attainment or for RFP 
requirements.
---------------------------------------------------------------------------

    \53\ Plan, Chapter 5.
---------------------------------------------------------------------------

3. The EPA's Evaluation
    The process followed by MAG in the MAG 2017 Ozone Plan to identify 
RACM is generally consistent with the EPA's recommendations in the 
General Preamble. The process included comparing existing control 
measures in the Phoenix nonattainment area to a comprehensive list of 
potential control measures for sources of NOX and VOC. As 
part of this process, MAG evaluated potential controls for all relevant 
source categories. MAG provided justification for rejecting measures 
that may provide greater emissions reductions, namely that those 
measures are not necessary for attainment or reasonable further 
progress and will not advance the Moderate Area attainment date.
    We have reviewed MAG's determination in the MAG 2017 Ozone Plan 
that its control measures represent RACM for NOX and VOC. 
MAG presented 13 measures for which it is claiming numerical credit 
towards attainment. We agree with the conclusion that there are no 
additional reasonably available measures that would advance attainment 
of the 2008 ozone standards in the Phoenix area by at least one year, 
because advancing attainment by one year could only have been achieved 
through implementation of additional controls by January 1, 2016, one 
year before the attainment plan was due. As explained in section III.C 
of this notice, we find that MAG has met RFP requirements with existing 
measures. Because the plan demonstrates expeditious attainment and RFP 
without new or more stringent control measures, we agree that the 
area's rules provide for the implementation of RACM for NOX 
and VOC. For the foregoing reasons, we propose to find that the MAG 
2017 Ozone Plan provides for the implementation of all RACM as required 
by CAA section 172(c)(1) and 40 CFR 51.1112(c).

C. Attainment Demonstration

1. Statutory and Regulatory Requirements and Guidance
    CAA section 182(b)(1)(A)(i) requires RFP plans for Moderate areas 
to provide for such specific annual reductions in emissions of VOC and 
NOX as necessary to attain the NAAQS by the applicable 
attainment date. The EPA interprets this as a requirement for Moderate 
areas to submit an attainment demonstration.\54\ Accordingly, under the 
SRR, Moderate areas are required to submit an attainment demonstration 
``based on photochemical grid modeling or any other analytical method 
determined . . . to be at least as effective.'' \55\ The demonstration 
must also meet the requirements of 40 CFR 51.112,\56\ which refers to 
the EPA's ``Guideline on Air Quality Models,'' 40 CFR part 50, Appendix 
W. The attainment demonstration predicts future ambient concentrations 
for comparison to the NAAQS, making use of available information on 
measured concentrations, meteorology, and current and projected 
emissions inventories of ozone precursors, including the effect of 
control measures in the plan.
---------------------------------------------------------------------------

    \54\ 80 FR 12264, 12269.
    \55\ 40 CFR 51.1108(c).
    \56\ Id.
---------------------------------------------------------------------------

    As described in section II.B of this notice, the Phoenix area was 
designated nonattainment effective July 20, 2012, and was reclassified 
to Moderate nonattainment in 2016. Therefore, the attainment date for 
the 2008 ozone NAAQS is as expeditious as practicable but no later than 
July 20, 2018.\57\ As explained in the preamble to the SRR, ``[t]o 
demonstrate attainment, the modeling results for the nonattainment area 
must predict that emissions reductions implemented by the beginning of 
the last full ozone season preceding the attainment date will result in 
ozone concentrations that meet the level of the standard.'' \58\ The 
SRR defines ``ozone season'' with reference to each state's ozone 
monitoring season,\59\ which for Arizona is year-round.\60\ Therefore, 
the modeling year for Phoenix must be no later than 2017.\61\
---------------------------------------------------------------------------

    \57\ 40 CFR 51.1103(a).
    \58\ 80 FR 12264, 12270.
    \59\ 40 CFR 51.1110(n).
    \60\ 40 CFR part 58, appendix D, section 4.1(i).
    \61\ 80 FR 12264, 12270.
---------------------------------------------------------------------------

    The Guideline on Air Quality Models recommends the use of 
photochemical grid models for ozone attainment demonstrations and 
encourages states to follow current modeling guidance.\62\ The EPA's 
recommended procedures for modeling ozone as part of an attainment 
demonstration are contained in ``Modeling Guidance for Demonstrating 
Attainment of Air Quality Goals for Ozone, PM2.5, and 
Regional Haze'' (``Modeling Guidance'').\63\ The Modeling Guidance 
includes recommendations for a modeling protocol, model input 
preparation, model performance evaluation, use of model output for the 
numerical NAAQS attainment test, and modeling documentation. Air 
quality modeling is performed using meteorology and emissions from a 
base year, and the predicted concentrations from this base case 
modeling are compared to air

[[Page 52844]]

quality monitoring data from that year to evaluate model performance.
---------------------------------------------------------------------------

    \62\ 40 CFR part 50, appendix W, section 5.3.1.
    \63\ ``Modeling Guidance for Demonstrating Attainment of Air 
Quality Goals for Ozone, PM2.5, and Regional Haze'', 
November 2018, EPA 454/R-18-009 (``Modeling Guidance'').
---------------------------------------------------------------------------

    Once the model performance is determined to be acceptable, future 
year emissions are simulated with the model. The relative (or percent) 
change in modeled concentration due to future emissions reductions 
provides a Relative Response Factor (RRF). Each monitoring site's RRF 
is applied to its monitored base year design value to provide the 
future design value for comparison to the NAAQS. The Modeling Guidance 
also recommends supplemental air quality analyses, which may be used as 
part of a weight of evidence (WOE) analysis. A WOE analysis 
corroborates the attainment demonstration by considering evidence other 
than the main air quality modeling attainment test, such as trends and 
additional monitoring and modeling analyses.
2. Summary of the State's Submission and the EPA's Evaluation
    MAG performed the air quality modeling for the plan, which relies 
on a 2011 base year and demonstrates attainment in 2017.\64\ The plan 
includes a modeling protocol that details and formalizes the procedures 
MAG used to prepare the attainment demonstration. The modeling protocol 
contains all the elements recommended in the Modeling Guidance: An 
overview of the air quality issue; selection of model, time period to 
model, modeling domain, and model boundary conditions and 
initialization procedures; a discussion of emissions inventory 
development and other model input preparation procedures; model 
performance evaluation procedures; selection of days and other details 
for calculating RRFs; supplemental analyses needed to develop a WOE 
analysis; and a list of participants in the analyses, schedules, and 
deliverables.\65\
---------------------------------------------------------------------------

    \64\ As described in section III.A. 3 of this notice, the Plan 
demonstrates that no additional reasonably available measures would 
advance attainment of the 2008 ozone standards in the Phoenix area 
by at least one year ahead of 2017. Therefore, 2017 is the 
appropriate modeled attainment year.
    \65\ MAG 2017 Ozone Plan, Appendix B, Exhibit 1, (``Modeling 
Technical Support Document'' or ``Modeling TSD''), Appendix A.
---------------------------------------------------------------------------

    The modeling and modeled attainment demonstration are described in 
Chapter 6 of the MAG 2017 Ozone Plan and in more detail in Appendix B, 
Exhibit 1 (``Modeling Technical Support Document'' or ``Modeling 
TSD''). The modeling analysis uses version 6.2 of the Comprehensive Air 
Quality Model with Extensions (CAMx) with meteorological input 
generated using the Weather and Research Forecasting model version 3.7 
(WRF). CAMx and WRF are both recognized in the Modeling Guidance as 
technically sound, state-of-the-art models. We reviewed the areal 
extent and the horizontal and vertical resolution used in these models 
and determined they were adequate for modeling Phoenix ozone. MAG chose 
2011 as the model base year because it corresponded to the most recent 
triennial inventory at the time of plan development. Additionally, 
supplemental analysis in Section IV of the Modeling TSD shows that 2011 
had among the highest number of ozone exceedance days and 4th highest 
daily maximum ozone concentrations in the 2009-2014 period. MAG modeled 
May through September, which spans the period of highest ozone 
concentrations in the Phoenix area.
    Section IV of the Modeling TSD describes the meteorological and 
ozone model performance statistics used to evaluate the modeling. MAG 
provides statistical metrics for modeled wind speed, wind direction, 
temperature, and water vapor mixing ratio compared to observations from 
13 weather stations in the nonattainment area paired in time and space. 
Temperature and water vapor mixing ratios show good agreement with 
observations, with little bias. The modeled wind speed shows an 
overestimate at low wind speeds and an underestimate at high wind 
speed. Modeled wind direction shows poorer performance for wind 
directions from the south-east. MAG asserts that modeling wind speed 
and direction in Phoenix is difficult due to the complex terrain in the 
area, but that results are comparable to the benchmarks described in 
the Modeling Guidance. No phenomenological evaluation, as described in 
the Modeling Guidance, was provided in the MAG 2017 Ozone Plan. While 
this type of analysis would have provided additional confidence, the 
model adequately simulates the temporal and spatial variability in 
ozone concentrations across the area, suggesting the model captures the 
meteorological phenomena that are important for ozone formation in the 
Phoenix area. We agree that the plan's meteorological modeling 
performance statistics appear satisfactory.
    Ozone model performance is described in Section IV-2 of the 
Modeling TSD and includes a comprehensive operational evaluation 
including tables of statistics, as recommended in the Modeling 
Guidance, for 1-hour ozone, daily maximum 8-hour ozone, and 8-hour 
ozone greater than 60 parts per billion (ppb) for the Phoenix area. 
Figures IV-5 through IV-10 of the Modeling TSD provide time series 
plots, scatter plots, spatial maps of mean error and bias, and box 
plots comparing model performance with previous studies.
    MAG set adequacy goals for normalized mean bias (15 
percent) and normalized mean error (35 percent), and results were well 
within these goals for the five-month modeling period, except in July 
where the model underpredicted ozone values greater than 60 ppb 
(normalized mean bias was -21 percent). The timeseries comparisons show 
generally good performance, except for a few periods where peak ozone 
concentrations were underpredicted in July and overpredicted in August. 
MAG modeling statistics are within or close to the distribution of 
other published modeling studies. Overall, the operational evaluation 
shows good model performance. While the addition of some dynamic and 
diagnostic evaluations as described in the Modeling Guidance would have 
provided additional confidence, the information provided in the MAG 
2017 Ozone Plan supports the adequacy of the modeling for the 
attainment demonstration.
    After determining that model performance for the 2011 base case was 
acceptable, MAG applied the model to develop RRFs for the attainment 
demonstration.\66\ This entailed running the model with the same 
meteorological inputs as before, but with adjusted emissions 
inventories to reflect the expected changes between 2011 and the 2017 
attainment year.
---------------------------------------------------------------------------

    \66\ See Chapter 6, pp. 6-8--6-11, and Modeling TSD, Section V-
1.
---------------------------------------------------------------------------

    MAG carried out the attainment test procedure consistent with the 
Modeling Guidance. The RRFs were calculated as the ratio of future to 
base year concentrations. This was done for each monitor using the top 
10 ozone days over 60 ppb in the base year simulation. The resulting 
RRFs were then applied to 2011 weighted base year design values \67\ 
for each monitor to arrive at 2017 future year design values.\68\ The 
highest 2017 ozone design value calculated is 0.0756 ppm, which occurs 
at the North Phoenix site. Ozone design values are truncated to the 
third decimal digit, so this value is sufficient to demonstrate 
attainment of the 2008 ozone standard.\69\
---------------------------------------------------------------------------

    \67\ The Modeling Guidance recommends that RRFs be applied to 
the average of 3-year design values centered on the base year, in 
this case the design values for 2009-2011, 2010-2012, and 2011-2013. 
This amounts to a 5-year weighted average of individual year 4th 
high concentrations, centered on the base year of 2011, and so is 
referred to as a weighted design value.
    \68\ Modeling TSD, Section V-1, Table V-2.
    \69\ 40 CFR part 50, Appendix P, section 2.2.

---------------------------------------------------------------------------

[[Page 52845]]

    Finally, the MAG 2017 Ozone Plan modeling includes an unmonitored 
area analysis to assess the attainment status of locations other than 
monitoring sites.\70\ The Modeling Guidance describes a ``gradient 
adjusted spatial fields'' procedure and the EPA software (``Modeled 
Attainment Test Software'' or MATS) used to carry it out.\71\ MAG used 
MATS v2.6.1 and showed that all modeled grid cells in the Phoenix area 
were predicted to be below the 2008 ozone standard in 2017. This 
analysis adds assurance that the attainment demonstration provides for 
attainment at all locations in Phoenix.
---------------------------------------------------------------------------

    \70\ Modeling TSD, Section V-2.
    \71\ Modeling Guidance, Section 4.7.
---------------------------------------------------------------------------

    In addition to the formal attainment demonstration, the plan also 
contains a comprehensive WOE analysis.\72\ This analysis provides 
support and corroboration for the modeling used in the attainment 
demonstration and the credibility of attainment in 2017. Downward 
trends are demonstrated for measured ozone concentrations, number of 
days above the ozone standard, measured concentrations of the ozone 
precursors NOX and VOC, and emissions of NOX and 
VOC. These analyses show the substantial air quality progress made in 
the Phoenix area and add support to the attainment demonstration. In 
addition, on June 13, 2019, the EPA proposed to find that the area 
attained the 2008 ozone NAAQS based on quality-assured 2015-2017 
data.\73\
---------------------------------------------------------------------------

    \72\ Modeling TSD, Section VI.
    \73\ 84 FR 27566.
---------------------------------------------------------------------------

3. Summary of the EPA's Evaluation
    For the reasons described in the previous section, and given the 
extensive discussion of modeling procedures, tests, performance 
analyses, and the good model performance in the Plan, the EPA finds 
that the modeling is adequate for purposes of supporting the attainment 
demonstration. The modeling shows that existing control measures are 
sufficient for the Phoenix area to attain the 2008 ozone standard by 
2017.

D. Reasonable Further Progress Demonstration

1. Statutory and Regulatory Requirements and Guidance
    Requirements for RFP for Moderate ozone nonattainment areas are 
specified in CAA sections 172(c)(2) and 182(b)(1). CAA section 
172(c)(2) requires that plans for nonattainment areas provide for RFP, 
which is defined as such annual incremental reductions in emissions of 
the relevant air pollutant as are required under part D (``Plan 
Requirements for Nonattainment Areas'') or may reasonably be required 
by the EPA for the purpose of ensuring attainment of the applicable 
NAAQS by the applicable date. CAA section 182(b)(1) specifically 
requires that ozone nonattainment areas that are classified as Moderate 
or above demonstrate a 15 percent reduction in VOC between the years of 
1990 and 1996. The EPA generally refers to section 182(b)(1) as the 
rate of progress (ROP) requirement.
    In the 2008 Ozone SRR, the EPA provided two options for areas that 
have an approved 15 percent VOC ROP plan under the 1-hour or 1997 ozone 
NAAQS for only a portion of the 2008 NAA.\74\ The MAG 2017 Ozone Plan 
employs the option to provide a demonstration of a 15 percent reduction 
in VOC emissions for the entire nonattainment area under 40 CFR 
51.1100(a)(3)(i).\75\ Except as specifically provided in CAA section 
182(b)(1)(C), emissions reductions from all SIP-approved, federally 
promulgated, or otherwise SIP-creditable measures that occur after the 
baseline year are creditable for purposes of demonstrating that the RFP 
targets are met. Because the EPA has determined that the passage of 
time has caused the effect of certain exclusions to be de minimis, the 
RFP demonstration is no longer required to calculate and specifically 
exclude reductions from measures related to motor vehicle exhaust or 
evaporative emissions promulgated by January 1, 1990; regulations 
concerning Reid vapor pressure promulgated by November 15, 1990; 
measures to correct previous RACT requirements; and, measures required 
to correct previous I/M programs.\76\
---------------------------------------------------------------------------

    \74\ 40 CFR 51.1110(a)(3).
    \75\ MAG 2017 Ozone Plan, 6-16.
    \76\ 40 CFR 51.1110(a)(7).
---------------------------------------------------------------------------

    The 2008 Ozone SRR requires the RFP baseline year to be the most 
recent calendar year for which a complete triennial inventory was 
required to be submitted to the EPA.\77\ For the purposes of developing 
RFP demonstrations for the 2008 ozone standards, the applicable 
triennial inventory year is 2011.
---------------------------------------------------------------------------

    \77\ 40 CFR 51.1110(b). The 2008 Ozone SRR allowed states to use 
an alternative year, between 2008 and 2012, for the baseline 
emissions inventory provided that the state demonstrated why the 
alternative baseline year was appropriate. In South Coast II, the 
U.S. Court of Appeals for the D.C. Circuit vacated this provision.
---------------------------------------------------------------------------

2. Summary of the State's Submission
    MAG selected 2011 as its baseline year for ROP. Table 6-1 of the 
MAG 2017 Ozone Plan shows 2011 average ozone season anthropogenic VOC 
emissions of 195.78 metric tpd. MAG multiplies 195.78 tpd by 85 percent 
(100 percent minus 15 percent) to calculate a 2017 ROP target of 166.41 
tpd. The plan estimates 2017 average daily VOC emissions at 165.28 
metric tpd, which is equivalent to a 15.6 percent reduction in 2011 
base year VOC emissions.\78\
---------------------------------------------------------------------------

    \78\ See MAG 2017 Ozone Plan, Table 6-1, ``Ozone Season Average 
Daily Emissions during May-September in 2011 and 2017 for the 
Maricopa Eight-Hour Ozone Nonattainment Area (metric tons/day).''

   Table 2--Ozone Season Average Daily Emissions during May--September in 2011 and 2017 for the Phoenix Ozone
                                         Nonattainment Area (metric tpd)
----------------------------------------------------------------------------------------------------------------
                                                                                                      Percent
                     VOC emission categories                           2011            2017       reduction 2011-
                                                                                                       2017
----------------------------------------------------------------------------------------------------------------
Point...........................................................            2.47            3.32           -34.4
Area............................................................           94.46           96.05            -1.7
Nonroad Mobile..................................................           27.89           20.26            27.4
Onroad Mobile...................................................           70.96           45.65            35.7
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
    Total *.....................................................          195.78          165.28            15.6
----------------------------------------------------------------------------------------------------------------
* Total percent change is a comparison of total 2011 VOC and 2017 VOC emissions, and is not the sum of the
  percent changes of the VOC emission categories in Table 2.
Source: Plan, Table 6-1.

[[Page 52846]]

3. The EPA's Review of the State's Submission
    MAG demonstrates a 15.6 percent reduction in VOC from 2011 to 2017, 
which meets the one-time ROP requirement for 15 percent reduction 
within 6 years from the baseline year. No other RFP demonstration is 
required for Moderate ozone nonattainment areas. Therefore, we propose 
to approve the RFP demonstration under sections 172(c)(2) and 
182(b)(1)(A) of the CAA and 40 CFR 51.1110(a)(3).

E. Contingency Measures in the Event of Failure To Make Reasonable 
Further Progress or Attain

1. Statutory and Regulatory Requirements
    Under the CAA, SIPs for ozone nonattainment areas classified under 
subpart 2 as Moderate must include contingency measures consistent with 
section 172(c)(9). Contingency measures are additional controls or 
measures to be implemented in the event the area fails to make RFP or 
attain the NAAQS by the attainment date. The SIP should contain trigger 
mechanisms for the contingency measures, specify a schedule for 
implementation, and indicate that the measure will be implemented 
without significant further action by the state or the EPA.\79\
---------------------------------------------------------------------------

    \79\ See 70 FR 71612 (November 29, 2005). See also 80 FR 12264, 
12285.
---------------------------------------------------------------------------

    Neither the CAA nor the EPA's implementing regulations establish a 
specific amount of emissions reductions that implementation of 
contingency measures must achieve, but the 2008 Ozone SRR reiterates 
the EPA's guidance recommendation that contingency measures should 
provide for emissions reductions approximately equivalent to one year's 
worth of RFP, thus amounting to reductions of 3 percent of the baseline 
emissions inventory for the nonattainment area.\80\
---------------------------------------------------------------------------

    \80\ 80 FR 12264, 12285.
---------------------------------------------------------------------------

    It has been the EPA's long-standing interpretation of section 
172(c)(9) that states may rely on existing federal measures (e.g., 
federal mobile source measures based on the incremental turnover of the 
motor vehicle fleet each year) and state or local measures in the SIP 
already scheduled for implementation that provide emissions reductions 
in excess of those needed to meet any other nonattainment plan 
requirements, such as meeting RACM/RACT, RFP or expeditious attainment 
requirements. The key is that the statute requires that contingency 
measures provide for additional emissions reductions that are not 
relied on for RFP or attainment and that are not included in the RFP or 
attainment demonstrations as meeting part or all of the contingency 
measure requirements. The purpose of contingency measures is to provide 
continued emissions reductions while the state revises the SIP to meet 
the missed milestone or attainment date.
    The EPA has approved numerous nonattainment area plan submissions 
under this interpretation, i.e., SIP revisions that use as contingency 
measures one or more federal or state control measures that are already 
in place and provide reductions that are in excess of the reductions 
required to meet other requirements or relied upon in the modeled 
attainment demonstration,\81\ and there is case law supporting the 
EPA's interpretation in this regard.\82\ However, in Bahr v. EPA, the 
Ninth Circuit rejected the EPA's interpretation of CAA section 
172(c)(9) as allowing for approval of already implemented control 
measures as contingency measures.\83\ The Ninth Circuit concluded that 
contingency measures must be measures that would take effect at the 
time the area fails to make RFP or attain by the applicable attainment 
date, not before.\84\ Thus, within the geographic jurisdiction of the 
Ninth Circuit, states cannot rely on already implemented control 
measures to comply with the contingency measure requirements under CAA 
section 172(c)(9).
---------------------------------------------------------------------------

    \81\ See, e.g., 62 FR 15844 (April 3, 1997) (direct final rule 
approving an Indiana ozone SIP revision); 62 FR 66279 (December 18, 
1997) (final rule approving an Illinois ozone SIP revision); 66 FR 
30811 (June 8, 2001) (direct final rule approving a Rhode Island 
ozone SIP revision); 66 FR 586 (January 3, 2001) (final rule 
approving District of Columbia, Maryland, and Virginia ozone SIP 
revisions); and 66 FR 634 (January 3, 2001) (final rule approving a 
Connecticut ozone SIP revision).
    \82\ See, e.g., LEAN v. EPA, 382 F.3d 575 (5th Cir. 2004) 
(upholding contingency measures that were previously required and 
implemented where they were in excess of the attainment 
demonstration and RFP SIP).
    \83\ Bahr v. EPA, 836 F.3d 1218, at 1235-1237 (9th Cir. 2016).
    \84\ Id. at 1235-1237.
---------------------------------------------------------------------------

2. Summary of the State's Submission
    The MAG 2017 Ozone Plan relies upon surplus emissions reductions 
from already implemented control measures in the 2017 attainment and 
RFP year to demonstrate compliance with the attainment and RFP 
contingency measure requirements of CAA section 172(c)(9).\85\ The 
State claims that the projected combined VOC and NOX 
emissions reductions between 2017 and 2018 of 3.68 percent (from the 
2011 baseline) satisfies the CAA requirements for contingency measures.
---------------------------------------------------------------------------

    \85\ MAG 2017 Ozone Plan, Chapter 4 and Appendix B, Exhibit 1, 
V-9 to V-10.

                    Table 3--Average Daily Anthropogenic VOC and NOX Emission Reductions in 2018 for Contingency Measure Requirements
                                                                    [Metric tons/day]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                               VOC                                                        NOX
                                   ---------------------------------------------------------------------------------------------------------------------
                                                                  Reduction    2018 Reduction                                Reduction    2018 Reduction
                                      2011     2017     2018     (2018-2017)      from 2011      2011     2017     2018     (2018-2017)      from 2011
--------------------------------------------------------------------------------------------------------------------------------------------------------
Point.............................     2.47     3.32     3.39           +0.07           2.83%     7.02    13.75    13.76           +0.01           0.14%
Area..............................    94.46    96.05    97.88           +1.83           1.94%    10.96    12.59    12.98           +0.39           3.56%
Nonroad...........................    27.89    20.26    20.07           -0.19          -0.68%    53.58    36.26    34.36           -1.90          -3.55%
Onroad............................    70.96    45.65    42.74           -2.91          -4.10%   117.15    62.69    58.05           -4.64          -3.96%
    Total.........................   195.78   165.28   164.08           -1.20          -0.61%   188.71   125.29   119.15           -6.14          -3.25%
--------------------------------------------------------------------------------------------------------------------------------------------------------
Combined VOC and NOX Emissions Reduction Percent in 2018: 3.86%.
Source: MAG 2017 Ozone Plan, Table V-4, page V-10.

[[Page 52847]]

3. The EPA's Review of the State's Submission
    Arizona is within the geographic jurisdiction of the Ninth Circuit 
and, therefore, following the Bahr decision, cannot rely on already 
implemented control measures to comply with the contingency measure 
requirement of CAA section 172(c)(9). Because the MAG 2017 Ozone Plan 
relies entirely upon such measures to meet the requirements of CAA 
section 172(c)(9), we are proposing to disapprove the contingency 
measure element of the plan.
    However, we are also proposing to find that contingency measures 
are no longer required for the Phoenix nonattainment area for the 2008 
ozone standard, for the reasons discussed below. Attainment contingency 
measures under 172(c)(9) are triggered upon the EPA's determination 
that an area failed to attain a given NAAQS by its applicable 
attainment date. Section 181(b)(2) requires the EPA to determine 
whether the area attained the NAAQS by its applicable attainment date. 
On June 13, 2019, the EPA proposed to determine that the Phoenix 
nonattainment area attained the Moderate area 2008 ozone NAAQS by the 
attainment date.\86\ We also proposed to find that, upon finalization 
of that determination, the attainment contingency measure requirement 
would no longer apply to the Phoenix nonattainment area for the 2008 
ozone NAAQS because attainment contingency measures for this NAAQS 
would never be required to be implemented.\87\
---------------------------------------------------------------------------

    \86\ 84 FR 27566.
    \87\ Id. at 27569.
---------------------------------------------------------------------------

    We are now also proposing to find that, upon finalization of that 
determination of attainment by the attainment date, the RFP contingency 
measure requirement would no longer apply to the Phoenix nonattainment 
area for the 2008 ozone NAAQS, for the reasons that follow. The purpose 
of the RFP requirements under the CAA is to ``ensur[e] attainment of 
the applicable [NAAQS] by the applicable date.'' \88\ Consistent with 
this purpose, under CAA section 182(g), ozone nonattainment areas 
classified ``Serious'' or higher are required to meet RFP emission 
reduction ``milestones'' and to demonstrate compliance with those 
milestones, except when the milestone coincides with the attainment 
date and the standard has been attained.\89\ This specific statutory 
exemption from milestone compliance demonstration submittals for areas 
that attained by the attainment date indicates that Congress intended 
that a finding that an area attained the standard--the finding made in 
a determination of attainment by the attainment date--would serve as a 
demonstration that RFP requirements for the area have been met. In 
other words, if a Serious or above area has attained the NAAQS by the 
attainment date, the RFP milestones have been sufficiently achieved. 
Accordingly, such a finding would also indicate that RFP contingency 
measures could not be triggered and are therefore no longer necessary.
---------------------------------------------------------------------------

    \88\ CAA section 171(c).
    \89\ CAA section 182(g)(2).
---------------------------------------------------------------------------

    In the case of Moderate areas, there are no RFP milestone 
compliance demonstration requirements.\90\ Accordingly, the EPA's long-
standing interpretation is that RFP contingency measures for Moderate 
areas would be triggered only by a finding that the area has failed to 
attain the standard by the attainment date.\91\ In other words, as with 
Serious and above areas, a determination of attainment by the 
attainment date for a Moderate area serves as demonstration that RFP 
requirements for the area have been met and that RFP contingency 
measures are no longer needed. Thus, the EPA concludes that RFP 
contingency measures for Moderate areas are no longer needed if the 
area has attained the relevant NAAQS. Accordingly, because we have 
proposed to determine that the Phoenix nonattainment area has attained 
the 2008 ozone NAAQS by the attainment date, we are now also proposing 
to determine that RFP contingency measures are no longer required for 
this standard in this area. Therefore, if we finalize our proposed 
determination of attainment by the attainment date, neither attainment 
nor RFP contingency measures would be required for the Phoenix ozone 
nonattainment area.
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    \90\ CAA section 182(g)(1)(exempting areas classified as 
Moderate from milestone requirements).
    \91\ See 57 FR 13498, 13511 (contrasting Moderate areas, for 
which ``contingency measures would be needed when the area fails to 
attain the standard by the attainment date'' with Serious and above 
areas, for which contingency measures would also be triggered ``if 
the area fails to meet the rate-of-progress requirements for any 
milestone other than one falling on an attainment year''). See also 
Memorandum from G.T. Helms, Chief Ozone/Carbon Monoxide Programs 
Branch, to Air Branch Chief, Regions I-X (``The test for moderate 
areas will be whether they attained the standard because the 
attainment date for moderate areas coincides with the milestone 
demonstration date.
    Failure to attain will cause an area to be required to implement 
its contingency measures . . .'').
---------------------------------------------------------------------------

    Under section 179(a) of the CAA, final disapproval of a submittal 
that addresses a requirement of part D, title I of the CAA or is 
required in response to a finding of substantial inadequacy as 
described in CAA section 110(k)(5) (SIP Call) starts sanctions clocks. 
The MAG 2017 Ozone Plan, including the contingency measures element, 
does address requirements of part D. However, if we finalize our 
determinations that the requirements for attainment and RFP contingency 
measures no longer apply to the Phoenix nonattainment area for the 2008 
ozone NAAQS, then the contingency measure element of the MAG 2017 Ozone 
Plan would no longer be required to address any part D requirement. 
Therefore, final disapproval of the contingency measure element of the 
MAG 2017 Ozone Plan would not trigger sanctions clocks. Similarly, 
final disapproval would not trigger any obligation for the EPA to 
promulgate a federal implementation plan (FIP) under CAA section 110(c) 
because there would be no deficiency for such a FIP to correct. 
Furthermore, if the State chooses to withdraw the contingency measures 
prior to our final action on the MAG 2017 Ozone Plan, we would take no 
final action either to approve or to disapprove those measures.

F. Motor Vehicle Emissions Budgets for Transportation Conformity

1. Statutory and Regulatory Requirements and Guidance
    Section 176(c) of the CAA requires federal actions in nonattainment 
and maintenance areas to conform to the SIP's goals of eliminating or 
reducing the severity and number of violations of the NAAQS and 
achieving timely attainment of the standards. Conformity to the SIP's 
goals means that such actions will not: (1) Cause or contribute to 
violations of a NAAQS, (2) worsen the severity of an existing 
violation, or (3) delay timely attainment of any NAAQS or any interim 
milestone.
    Actions involving Federal Highway Administration (FHWA) or Federal 
Transit Administration (FTA) funding or approval are subject to the 
EPA's transportation conformity rule, codified at 40 CFR part 93, 
subpart A. Under this rule, metropolitan planning organizations in 
nonattainment and maintenance areas coordinate with state and local air 
quality and transportation agencies, the EPA, the FHWA, and the FTA to 
demonstrate that an area's regional transportation plans and 
transportation improvement programs conform to the applicable SIP. This 
demonstration is typically done by showing that estimated emissions 
from

[[Page 52848]]

existing and planned highway and transit systems are less than or equal 
to the MVEBs contained in all control strategy SIPs. Budgets are 
generally established for specific years and specific pollutants or 
precursors. Ozone plans should identify budgets for on-road emissions 
of ozone precursors (NOX and VOC) in the area for each RFP 
milestone year and the attainment year, if the plan demonstrates 
attainment.\92\
---------------------------------------------------------------------------

    \92\ 40 CFR 93.102(b)(2)(i).
---------------------------------------------------------------------------

    For budgets to be approvable, they must meet, at a minimum, the 
EPA's adequacy criteria in 40 CFR 93.118(e)(4). To meet these 
requirements, the budgets must be consistent with the attainment and 
RFP requirements and reflect all the motor vehicle control measures 
contained in the attainment and RFP demonstrations.\93\
---------------------------------------------------------------------------

    \93\ 40 CFR 93.118(e)(4)(iii), (iv) and (v). For more 
information on the transportation conformity requirements and 
applicable policies on MVEBs, please visit our transportation 
conformity website at: http://www.epa.gov/otaq/stateresources/transconf/index.htm.
---------------------------------------------------------------------------

    The EPA's process for determining adequacy of a budget consists of 
three basic steps: (1) providing public notification of a SIP 
submission; (2) providing the public the opportunity to comment on the 
budget during a public comment period; and (3) making a finding of 
adequacy or inadequacy.\94\
---------------------------------------------------------------------------

    \94\ 40 CFR 93.118(f)(2).
---------------------------------------------------------------------------

2. Summary of the State's Submission
    The MAG 2017 Ozone Plan establishes conformity budgets based on 
2017 onroad mobile source VOC and NOX emissions in the 
nonattainment area used to model attainment of the 2008 ozone standard. 
The conformity budgets are represented by the average daily onroad VOC 
and NOX emissions from May 1 to September 30. The budgets 
are 45.7 metric tpd for VOC and 62.7 metric tpd for NOX.
    MAG developed budgets using the EPA's Motor Vehicle Emission 
Simulator (MOVES) 2014a model and MAG MOVESLINK2014 tool. At the time 
of plan preparation, MOVES2014a (released on November 4, 2015) was the 
EPA's latest approved version of the MOVES model for estimating 
emissions from on-road vehicles operating in states (other than 
California). MOVES2014a uses local data such as vehicle miles traveled, 
vehicle population, meteorological data, and average speed distribution 
to develop emissions estimates.
3. The EPA's Review of the State's Submission
    We have evaluated the submitted budgets in the MAG 2017 Ozone Plan 
against our adequacy criteria in 40 CFR 93.118(e)(4) as part of our 
review of the budgets' approvability and will complete the adequacy 
review concurrent with our final action on the ozone plan. We posted 
the Plan for adequacy review on the EPA's website on September 9, 
2019.\95\ The EPA is not required under our transportation conformity 
rule to find budgets adequate prior to proposing approval of them.\96\
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    \95\ https://www.epa.gov/state-and-local-transportation/state-implementation-plans-sip-submissions-currently-under-epa.
    \96\ Under the Transportation Conformity regulations, the EPA 
may review the adequacy of submitted motor vehicle emission budgets 
simultaneously with the EPA's approval or disapproval of the 
submitted implementation plan. 40 CFR 93.118(f)(2).
---------------------------------------------------------------------------

    The MAG 2017 Ozone Plan budgets are consistent with the RFP 
demonstration and attainment demonstration, are clearly identified and 
precisely quantified, and meet all other applicable statutory and 
regulatory requirements, including the adequacy criteria in 40 CFR 
93.118(e)(4) and (5).\97\ For these reasons, the EPA proposes to 
approve the budgets in the Plan. We also interpret the budgets in the 
MAG 2017 Ozone Plan as superseding the transportation conformity 
discussion in MAG's 2014 Ozone Plan, which we previously deferred 
action on. Therefore, we propose to find that no further action on that 
element of the MAG 2014 Ozone Plan is necessary.
---------------------------------------------------------------------------

    \97\ Memorandum to File, Nancy Levin, EPA Region IX, ``Adequacy 
Documentation for Plan Motor Vehicle Emission Budgets in December 
2016 Phoenix 2008 Ozone NAAQS Attainment Plan,'' September 6, 2019.
---------------------------------------------------------------------------

    If we finalize approval of the budgets in the MAG 2017 Ozone Plan 
as proposed, they will replace the budgets from the MAG 2007 and 2009 
ozone plans that we previously found adequate for use in conformity 
determinations by transportation agencies in the Phoenix nonattainment 
area.\98\
---------------------------------------------------------------------------

    \98\ On June 13, 2012, the EPA published the final rule 
approving the MAG 2007 Eight-Hour Ozone Plan, including the 2008 
emissions budgets for VOC of 67.9 metric tpd and NOX of 
138.2 metric tpd, effective July 13, 2012. On September 17, 2014, 
the EPA published a final rule approving the MAG 2009 Eight-Hour 
Ozone Maintenance Plan, including the 2025 emissions budget for VOC 
of 43.8 metric tpd and NOX of 101.8 metric tpd, effective 
October 17, 2014.
---------------------------------------------------------------------------

G. Vehicle Inspection and Maintenance

1. Statutory and Regulatory Requirements and Guidance
    The EPA's I/M regulations are codified at 40 CFR part 51, subpart S 
(``Inspection/Maintenance Program Requirements''), sections 51.350 
through 51.373. As explained in the preambles to the proposed and final 
SRR, no new vehicle I/M programs were required for purposes of the 2008 
ozone NAAQS based on the initial designations and classifications for 
the 2008 ozone NAAQS.\99\ However, the preamble to the proposed SRR 
also noted that if a Marginal 2008 ozone nonattainment area meeting the 
population cutoff for mandatory I/M were reclassified to Moderate or a 
higher classification, then an I/M program would be required at that 
time.\100\
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    \99\ 78 FR 34178, 34194-34196, 80 FR 12283.
    \100\ 78 FR 34178, 34194-34195.
---------------------------------------------------------------------------

2. Summary of the State's Submission
    The Plan notes that the EPA approved ADEQ's basic and enhanced 
vehicle emissions I/M programs on January 22, 2003, and that in 2016 
the State legislature passed Senate Bill 1255, which includes a 
statutory provision that authorizes the Arizona Vehicle Emissions 
Inspection (VEI) Program through July 1, 2022.\101\ This statutory 
provision (A.R.S. Section 41-3022.09) was included as part of the 
submittal.\102\
---------------------------------------------------------------------------

    \101\ 2017 Ozone Plan, 5-14--5-15.
    \102\ 2017 Ozone Plan, Appendix B, Exhibit 2. S.B. 1255 and 
associated fact sheet.
---------------------------------------------------------------------------

3. The EPA's Review of the State's Submission
    Following our initial approval of ADEQ's VEI program in 1995, the 
EPA has taken several actions to approve changes to the program.\103\ 
Most recently, in 2013 we approved revisions that exempted motorcycles 
in the Phoenix metropolitan area from emissions testing and expanded 
the portion of the Phoenix metropolitan area where the VEI program and 
other control programs apply (``Area A'').\104\ We found that with 
these changes, the ADEQ VEI program would continue to meet minimum 
federal requirements for vehicle I/M programs.\105\ These requirements 
have not changed since 2013. Therefore, we conclude that the ADEQ VEI 
program continues to meet the minimum stringency requirements of 40 CFR 
part 51, subpart S.
---------------------------------------------------------------------------

    \103\ See 77 FR 66422, 66422--66423 (November 5, 2012) for a 
summary of these actions.
    \104\ 78 FR 30209 (May 22, 2013).
    \105\ Id. at 30211.

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[[Page 52849]]

    With respect to the geographic scope of the VEI program, we note 
that 40 CFR 51.350(b)(2) requires the program to ``nominally cover at 
least the entire urbanized area, based on the 1990 census.'' The 
current Area A includes all of the Phoenix urbanized area, based on the 
1990 census.\106\ Therefore, the VEI program meets the geographic scope 
requirements of 40 CFR part 51, subpart S.
---------------------------------------------------------------------------

    \106\ See Map of 2008 Ozone Phoenix NAA and Area A (``AIR19037--
2008 8hr O3 Phoenix NAA and Area A Stage 2 Vapor Recovery 
Area.png'').
---------------------------------------------------------------------------

    Finally, 40 CFR 51.350(b) provides that legislation authorizing an 
I/M program must not sunset prior to the attainment deadline for the 
NAAQS. The Plan includes a copy of S.B. 1255, which repealed an 
existing statutory provision that would have terminated the VEI program 
on January 1, 2017 (i.e., A.R.S. 41-3017.01) and added a new statutory 
provision to extend the program through July 1, 2022 (i.e., A.R.S. 
Section 41-3022.09). The VEI program is, therefore, authorized beyond 
the attainment date of July 20, 2018. Furthermore, based on the Arizona 
legislature's past support for the VEI program, we expect the 
legislature to extend the life of the VEI program once again prior to 
July 1, 2022. Therefore, we propose to determine that the Plan meets 
the statutory and regulatory I/M requirements.

H. New Source Review Rules

1. Statutory and Regulatory Requirements and Guidance
    Section 182(a)(2)(C) of the CAA requires states to develop SIP 
revisions containing permit programs for each of its ozone 
nonattainment areas. The SIP revisions are to include requirements for 
permits in accordance with CAA sections 172(c)(5) and 173 for the 
construction and operation of each new or modified major stationary 
source for VOC and NOX anywhere in the nonattainment area. 
The 2008 Ozone SRR includes provisions and guidance for nonattainment 
new source review (NSR) programs.\107\
---------------------------------------------------------------------------

    \107\ 80 FR 12264, 12286-12288.
---------------------------------------------------------------------------

2. Summary of the State's Submittal
    The MAG 2017 Ozone Plan describes the roles of ADEQ, MCAQD and 
PCAQCD in implementing the preconstruction permit program in the 
Phoenix nonattainment area.\108\ In particular, the Plan explains that 
ADEQ has permitting jurisdiction for the following stationary source 
categories: smelting of metal ores, coal-fired electric generating 
stations, petroleum refineries, Portland cement plants, and portable 
sources. ADEQ also has permitting jurisdiction over other major source 
categories in Pinal County, but has delegated implementation of the 
major source program to PCAQCD, which implements ADEQ's major NSR 
rules. MCAQD has jurisdiction over other sources in Maricopa County. 
The Plan also described various SIP revisions submitted by ADEQ to meet 
nonattainment NSR requirements.
---------------------------------------------------------------------------

    \108\ 2017 Ozone Plan.
---------------------------------------------------------------------------

3. The EPA's Review of the State's Submission
    On November 2, 2015, the EPA published a final limited approval and 
limited disapproval of revisions to ADEQ's NSR rules.\109\ On May 4, 
2018, the EPA approved additional rule revisions to address many of the 
deficiencies identified in the 2015 action.\110\ On April 5, 2019, the 
EPA approved revisions to MCAQD's NSR rules.\111\ Collectively these 
rule revisions will ensure that ADEQ's rules provide for appropriate 
NSR for sources undergoing construction or major modification in the 
Phoenix nonattainment area. Therefore, the EPA proposes to approve the 
NSR element of the MAG 2017 Ozone Plan as demonstrating that the NSR 
requirement has been met for the Phoenix Moderate nonattainment area.
---------------------------------------------------------------------------

    \109\ 80 FR 67319.
    \110\ 83 FR 19631.
    \111\ 84 FR 13543.
---------------------------------------------------------------------------

    We previously deferred action on the NSR element of the 2014 MAG 
Ozone Plan, in light of the expected submittal of revised ADEQ and 
MCAQD NSR rules. Based on our recent approvals of these rules, we now 
propose to approve this element of the 2014 MAG Ozone Plan as 
demonstrating that the NSR requirement has been met for Phoenix ozone 
Marginal NAA.

I. Offset Requirements

1. Statutory and Regulatory Requirements and Guidance
    CAA Section 173 requires new and modified major sources in 
nonattainment areas to secure emissions reductions (i.e., ``offsets'') 
to compensate for a proposed emissions increase. As explained in the 
preamble to the SRR, ``[o]ffsets are generated by emissions reductions 
that meet specific creditability criteria set forth by the SIP 
consistent with EPA regulations.'' \112\ For Moderate areas, section 
182(b)(5) of the Act sets a general offset ratio of 1.15 to 1 for total 
VOC and NOX emissions reductions as compared to VOC and 
NOX emissions increases.
---------------------------------------------------------------------------

    \112\ 80 FR 12264, 12288 (citing 40 CFR 51.165(a)(3)(ii)(A)-(J) 
and part 51 appendix S section IV.C).
---------------------------------------------------------------------------

2. Summary of the State's Submittal
    The MAG 2017 Ozone Plan references Arizona Administrative Code Rule 
18-2-404(J) and Maricopa County Air Pollution Control Regulations, Rule 
240, Section 304.6 as fulfilling the requirements of CAA section 
182(b)(5).
3. The EPA's Review of the State's Submission
    The EPA approved Arizona Administrative Code Rule 18-2-404 and 
Maricopa County Air Pollution Control Regulations, Rule 240 part of our 
recent actions on the ADEQ and MCAQD NSR rules.\113\ Therefore, we 
propose to approve the offset element of the MAG 2017 Ozone Plan as 
demonstrating that the Moderate area offset requirements of CAA 
sections 173 and 182(b)(5) have been met for the Phoenix nonattainment 
area.
---------------------------------------------------------------------------

    \113\ Id., 83 FR 19631.
---------------------------------------------------------------------------

    In light of the expected submittal of revised ADEQ and MCAQD NSR 
rules, we previously deferred action on the offset element of the MAG 
2014 Ozone Plan. Based on our recent approvals of these rules, we now 
propose to approve the offset element of the MAG 2014 Ozone Plan as 
demonstrating that the Marginal area offset requirements of CAA 
sections 173 and 182(a)(4) have been met for the Phoenix nonattainment 
area.

IV. Proposed Action

    For the reasons discussed above, under CAA section 110(k)(3), the 
EPA is proposing to approve as a revision to the Arizona SIP the 
following portions of the MAG ``2017 Eight-Hour Ozone Moderate Area 
Plan for the Maricopa Nonattainment Area'' submitted by ADEQ on 
December 19, 2016:
     Base year and periodic emission inventories as meeting the 
requirements of CAA sections 172(c)(3), 182(a)(1), and 182(a)(3)(A), 
and 40 CFR 51.1115(a) and 40 CFR 51.1115(b);
     RACM demonstration and control strategy as meeting the 
requirements of CAA section 172(c)(1) and 172 (c)(6) and 40 CFR 
51.1112(c);
     Attainment demonstration as meeting the requirements of 
CAA section 182(b)(1)(A)(i) and 40 CFR 51.112 and 51.1108(c);
     ROP plan and RFP demonstration as meeting the requirements 
of CAA sections 172(c)(2) and 182(b)(1) and 40 CFR 51.1110(a)(3)(i);
     Motor vehicle emissions budgets for the attainment year of 
2017 because

[[Page 52850]]

they are consistent with the RFP demonstration and the attainment 
demonstration proposed for approval herein and meet the other criteria 
in 40 CFR 93.118(e);
     Vehicle I/M provisions as meeting the requirements of 40 
CFR part 51, subpart S;
     NSR discussion as demonstrating that the requirements of 
CAA sections 173 and 182(a)(2)(C) have been met; and
     Offset discussion as demonstrating that the requirements 
of CAA sections 173 and 182(b)(5) have been met.
    The EPA is proposing to disapprove the contingency measure element 
of the MAG 2017 Ozone Plan for failing to meet the requirements of CAA 
sections 172(c)(9) and 182(c)(9). However, based on our proposed 
finding of attainment by the applicable attainment date, we are also 
proposing to determine that the contingency measures requirement will 
no longer apply to the Phoenix nonattainment area if we finalize the 
determination of attainment by the applicable attainment date. 
Therefore, our proposed disapproval, if finalized, would not trigger 
sanctions or FIP clocks.
    Finally, we are proposing to approve the NSR and offset elements of 
the MAG 2014 Ozone Plan as demonstrating that the Marginal area 
requirements of CAA section 182(a)(2)(C) and CAA sections 173 and 
182(b)(5), respectively, have been met for the Phoenix nonattainment 
area.
    The EPA is soliciting public comments on the proposed actions 
listed above, our rationales for the proposed actions, and any other 
pertinent matters related to the issues discussed in this document. We 
will accept comments from the public on this proposal for a period of 
30 days from publication and will consider comments before taking final 
action.

V. Statutory and Executive Order Reviews

    Additional information about the following statutes and Executive 
Orders can be found at http://www2.epa.gov/laws-regulations/laws-and-executive-orders.

A. Executive Order 12866: Regulatory Planning and Review and Executive 
Order 13563: Improving Regulation and Regulatory Review

    This action is not a significant regulatory action and was 
therefore not submitted to the Office of Management and Budget (OMB) 
for review.

B. Executive Order 13711: Reducing Regulations and Controlling 
Regulatory Costs

    This action is not expected to be an Executive Order 13771 
regulatory action because this action is not significant under 
Executive Order 12866.

C. Paperwork Reduction Act (PRA)

    This action does not impose an information collection burden under 
the PRA because this action does not impose additional requirements 
beyond those imposed by state law.

D. Regulatory Flexibility Act (RFA)

    I certify that this action will not have a significant economic 
impact on a substantial number of small entities under the RFA. This 
action will not impose any requirements on small entities beyond those 
imposed by state law.

E. Unfunded Mandates Reform Act (UMRA)

    This action does not contain any unfunded mandate as described in 
UMRA, 2 U.S.C. 1531-1538, and does not significantly or uniquely affect 
small governments. This action does not impose additional requirements 
beyond those imposed by state law. Accordingly, no additional costs to 
state, local, or tribal governments, or to the private sector, will 
result from this action.

F. Executive Order 13132: Federalism

    This action does not have federalism implications. It will not have 
substantial direct effects on the states, on the relationship between 
the national government and the states, or on the distribution of power 
and responsibilities among the various levels of government.

G. Executive Order 13175: Coordination With Indian Tribal Governments

    This action does not have tribal implications, as specified in 
Executive Order 13175, because the SIP is not approved to apply on any 
Indian reservation land or in any other area where the EPA or an Indian 
tribe has demonstrated that a tribe has jurisdiction, and will not 
impose substantial direct costs on tribal governments or preempt tribal 
law. Thus, Executive Order 13175 does not apply to this action.

H. Executive Order 13045: Protection of Children From Environmental 
Health Risks and Safety Risks

    The EPA interprets Executive Order 13045 as applying only to those 
regulatory actions that concern environmental health or safety risks 
that the EPA has reason to believe may disproportionately affect 
children, per the definition of ``covered regulatory action'' in 
section 2-202 of the Executive Order. This action is not subject to 
Executive Order 13045 because it does not impose additional 
requirements beyond those imposed by state law.

I. Executive Order 13211: Actions That Significantly Affect Energy 
Supply, Distribution, or Use

    This action is not subject to Executive Order 13211, because it is 
not a significant regulatory action under Executive Order 12866.

J. National Technology Transfer and Advancement Act (NTTAA)

    Section 12(d) of the NTTAA directs the EPA to use voluntary 
consensus standards in its regulatory activities unless to do so would 
be inconsistent with applicable law or otherwise impractical. The EPA 
believes that this action is not subject to the requirements of section 
12(d) of the NTTAA because application of those requirements would be 
inconsistent with the CAA.

K. Executive Order 12898: Federal Actions To Address Environmental 
Justice in Minority Populations and Low-Income Population

    The EPA lacks the discretionary authority to address environmental 
justice in this rulemaking.

List of Subjects in 40 CFR Part 52

    Environmental protection, Air pollution control, Incorporation by 
reference, Intergovernmental relations, Nitrogen dioxide, Ozone, 
Reporting and recordkeeping requirements, Volatile organic compounds.

    Authority: 42 U.S.C. 7401 et seq.

    Dated: September 20, 2019.
Deborah Jordan
Acting Regional Administrator, Region IX.
[FR Doc. 2019-21468 Filed 10-2-19; 8:45 am]
 BILLING CODE 6560-50-P