Document ID: EPA-R10-OAR-2016-0001-0007
Agency: epa
Document Type: Rule
Title: Air Quality State Implementation Plans; Approvals and Promulgations: Idaho; 2010 Sulfur Dioxide National Ambient Air Quality Standards Interstate Transport Requirements
Posted Date: 2021-04-09T04:00Z

[Federal Register Volume 86, Number 67 (Friday, April 9, 2021)]
[Rules and Regulations]
[Pages 18457-18459]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-07333]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[EPA-R10-OAR-2016-0001; FRL-10021-86-Region 10]

Air Plan Approval; ID; 2010 Sulfur Dioxide NAAQS Interstate 
Transport Requirements

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

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SUMMARY: The Environmental Protection Agency (EPA) is approving a State 
Implementation Plan (SIP) submission from the State of Idaho (Idaho or 
the State) that addresses the Clean Air Act (CAA or Act) interstate 
transport requirements for the 2010 1-hour Sulfur Dioxide 
(SO2) National Ambient Air Quality Standards (NAAQS). In 
this action, EPA is determining that Idaho will not contribute 
significantly to nonattainment or interfere with maintenance of the 
2010 1-hour SO2 NAAQS in any other state, the Fort Hall 
Reservation, or the Kalispel Reservation. Therefore, EPA is approving 
Idaho's December 24, 2015 SIP submission as meeting the interstate 
transport requirements for the 2010 1-hour SO2 NAAQS.

DATES: This action is effective on May 10, 2021.

ADDRESSES: EPA has established a docket for this action under Docket ID 
No. EPA-R10-OAR-2016-0001. All documents in the docket are listed on 
the https://www.regulations.gov website. Although listed in the index, 
some information is not publicly available, e.g., confidential business 
information (CBI) or other information whose disclosure is restricted 
by statute. Certain other material, such as copyrighted material, is 
not placed on the internet and will be publicly available only in hard 
copy form. Publicly available docket materials are available through 
https://www.regulations.gov, or please contact the person identified in 
the FOR FURTHER INFORMATION CONTACT section for additional availability 
information.

FOR FURTHER INFORMATION CONTACT: Claudia Vaupel, (206) 553-6121, or 
vaupel.claudia@epa.gov.

SUPPLEMENTARY INFORMATION:

I. Background Information

    On October 5, 2020, EPA proposed to approve Idaho's December 24, 
2015 SIP submission as meeting the interstate transport requirements of 
CAA section 110(a)(2)(D)(i)(I) for the 2010 1-hour SO2 NAAQS 
(85 FR 62679). Please refer to the October 5, 2020 notice of proposed 
rulemaking (NPRM) for an explanation of the CAA requirements, a 
detailed analysis of the submission, and EPA's proposed rationale for 
approval. The public comment period for this NPRM ended on November 4, 
2020.
    EPA notes that since the publication of the NPRM, we have 
determined that the Kalispel Indian Community of the Kalispel 
Reservation is eligible to be treated in the same manner as an affected 
downwind state (TAS) for purposes of CAA sections 110(a)(2)(D) and 
126.\1\ The Kalispel Reservation is located approximately 16 km from 
the Idaho border, surrounded entirely by the State of Washington. EPA's 
original evaluation did not specifically evaluate potential air quality 
impacts of sources in Idaho to the Kalispel Reservation. However, EPA's 
technical evaluation of Washington State would have identified sources 
of SO2 near the Kalispel Reservation that meet the 
evaluation criteria described in the NPRM. We have specifically re-
examined that information with respect to the Kalispel Reservation and 
affirm that consideration of the Kalispel Reservation as an affected 
downwind state does not impact our analysis completed at proposal, and 
therefore does not impact our findings with respect to the adequacy of 
Idaho's SIP for purposes of CAA section 110(a)(2)(D) as it relates to 
the 2010 SO2 NAAQS.
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    \1\ On February 12, 2021, EPA determined that the Kalispel Tribe 
is eligible for treatment in the same manner as a state for CAA 
section 110(a)(2)(D) (86 FR 9334).
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II. Response to Comments

    Comment: EPA received one adverse comment on the proposed approval. 
While stating that the commenter had ``no objection'' to the approval 
of Idaho's SIP, the commenter expressed concern ``about a possible 
variable in the equation that might be currently overlooked.'' Citing 
footnote 8 of EPA's proposed action, the commenter expressed concern 
about EPA's analytical approach that limited the analysis to Idaho 
sources emitting more than 100 tons per year of SO2. The 
commenter is concerned that, ``while one source emitting less than 100 
tpy may have little effect on neighboring states attainment of NAAQS, 
the aggregate effect of all those Idaho sources combined may have a 
very real effect and contribute significantly to its neighboring states 
non-attainment of NAAQS.''
    The commenter acknowledged EPA's assertion that SO2 is 
expected to dissipate within 50 km of a point source. However, without 
citing any specific evidence of impermissible impacts from such smaller 
sources, the commenter posited that ``it may be possible that a smaller 
source of SO2 emission, if not accounted for, may be 
contributing to the non-attainment of a downwind state. It may also be 
possible that the aggregate effect of these smaller unaccounted for 
sources may be contributing to far more SO2 in the air than 
currently known.'' The commenter urged EPA to consider ways to take 
sources of SO2 with releases less than 100 tpy into account 
in some way that ``will not create undue burdens and costs''. The 
commenter suggests that increased monitoring at these smaller sources 
would reduce uncertainty in whether the sources are contributing to air 
quality problems in neighboring states and tribal areas, but 
acknowledges that extensive monitoring at small sources may not be 
practical. They propose EPA considering smaller sources in their 
notices could be sufficient enough to evaluate their air quality 
impacts.
    Response: EPA continues to believe that the weight of evidence 
analysis provided in the NPRM is adequate to determine the potential 
downwind impact from Idaho to neighboring states. In its submission, 
Idaho identified the largest SO2 emission sources in the 
State, explaining that because ``SO2 will most likely either 
disperse in the atmosphere or chemically react to form a secondary 
pollutant within a few miles of the source, only large pollutant 
sources in proximity to the state boundary would be expected to

[[Page 18458]]

significantly contribute to or interfere with air quality in adjacent 
states.'' In considering sources emitting less than 100 tpy of 
SO2 at proposal, EPA independently stated that ``in the 
absence of special factors, for example the presence of a nearby larger 
source or unusual physical factors, Idaho sources emitting less than 
100 tpy can be presumed to not be causing or contributing to 
SO2 concentrations above the NAAQS.'' Additionally, 
emissions from sources greater than 100 tpy account for 88 percent of 
Idaho's statewide SO2 emissions from point sources, and thus 
are appropriate to evaluate for purposes of determining whether there 
is any emissions activity within the State that is in violation of the 
good neighbor provision. EPA continues to find that this is an 
appropriate assessment of upwind SO2 sources' downwind 
impacts on neighboring states. EPA's analysis includes the following 
factors: (1) Ambient air quality data for active SO2 
monitors in Idaho or in a neighboring or downwind state within 50 km of 
the Idaho border, (2) emissions information for SO2 sources 
in Idaho emitting greater than 100 tpy and located within 50 km of the 
Idaho border, (3) emissions information for SO2 sources in 
neighboring or downwind states or tribal areas emitting more than 100 
tpy and located within 50 km of the Idaho border, (4) available 
modeling and monitoring information for any area within 50 km of the 
Idaho border, and (5) SO2 emissions trends in Idaho and 
neighboring and downwind states and tribal areas.
    EPA notes that the commenter did not provide a technical analysis 
or any additional specific information indicating that sources emitting 
100 tpy or less (or an aggregation of sources emitting less than 100 
tpy) may have downwind impacts that violate the good neighbor 
provision. For these reasons, EPA finds that our analysis of the Idaho 
sources in the NPRM, considered alongside other weight of evidence 
factors described in that document, support EPA's conclusion that Idaho 
has satisfied CAA section 110(a)(2)(D)(i)(I) for the 2010 1-hour 
SO2 NAAQS.

III. Final Action

    EPA is approving Idaho's December 24, 2015 submission as meeting 
CAA section 110(a)(2)(D)(i)(I) interstate transport requirements for 
the 2010 SO2 NAAQS.

IV. Statutory and Executive Orders Review

    Under the Clean Air Act, the Administrator is required to approve a 
SIP submission that complies with the provisions of the Clean Air Act 
and applicable Federal regulations. 42 U.S.C. 7410(k); 40 CFR 52.02(a). 
Thus, in reviewing SIP submissions, EPA's role is to approve State 
choices, provided that they meet the criteria of the Clean Air Act. 
Accordingly, this action merely approves State law as meeting Federal 
requirements and does not impose additional requirements beyond those 
imposed by State law. For that reason, this action:
     Is not a ``significant regulatory action'' subject to 
review by the Office of Management and Budget under Executive Orders 
12866 (58 FR 51735; October 4, 1993) and 13563 (76 FR 3821; January 21, 
2011);
     Does not impose an information collection burden under the 
provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.);
     Is certified as not having a significant economic impact 
on a substantial number of small entities under the Regulatory 
Flexibility Act (5 U.S.C. 601 et seq.);
     Does not contain any unfunded mandate or significantly or 
uniquely affect small governments, as described in the Unfunded 
Mandates Reform Act of 1995 (Pub. L. 104-4);
     Does not have federalism implications as specified in 
Executive Order 13132 (64 FR 43255; August 10, 1999);
     Is not an economically significant regulatory action based 
on health or safety risks subject to Executive Order 13045 (62 FR 
19885; April 23, 1997);
     Is not a significant regulatory action subject to 
Executive Order 13211 (66 FR 28355; May 22, 2001);
     Is not subject to requirements of section 12(d) of the 
National Technology Transfer and Advancement Act of 1995 (15 U.S.C. 272 
note) because application of those requirements would be inconsistent 
with the Clean Air Act; and
     Does not provide EPA with the discretionary authority to 
address, as appropriate, disproportionate human health or environmental 
effects, using practicable and legally permissible methods, under 
Executive Order 12898 (59 FR 7629; February 16, 1994).
    The SIP is not approved to apply on any Indian reservation land or 
in any other area where EPA or an Indian tribe has demonstrated that a 
tribe has jurisdiction. In those areas of Indian country, the rule does 
not have tribal implications and it will not impose substantial direct 
costs on tribal governments or preempt tribal law as specified by 
Executive Order 13175 (65 FR 67249; November 9, 2000).
    The Congressional Review Act, 5 U.S.C. 801 et seq., as added by the 
Small Business Regulatory Enforcement Fairness Act of 1996, generally 
provides that before a rule may take effect, the agency promulgating 
the rule must submit a rule report, which includes a copy of the rule, 
to each House of the Congress and to the Comptroller General of the 
United States. EPA will submit a report containing this action and 
other required information to the U.S. Senate, the U.S. House of 
Representatives, and the Comptroller General of the United States prior 
to publication of the rule in the Federal Register. A major rule cannot 
take effect until 60 days after it is published in the Federal 
Register. This action is not a ``major rule'' as defined by 5 U.S.C. 
804(2).
    Under section 307(b)(1) of the Clean Air Act, petitions for 
judicial review of this action must be filed in the United States Court 
of Appeals for the appropriate circuit by June 8, 2021. Filing a 
petition for reconsideration by the Administrator of this final rule 
does not affect the finality of this action for the purposes of 
judicial review nor does it extend the time within which a petition for 
judicial review may be filed, and shall not postpone the effectiveness 
of such rule or action. This action may not be challenged later in 
proceedings to enforce its requirements. See CAA section 307(b)(2).

List of Subjects in 40 CFR Part 52

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

    Dated: April 6, 2021.
Michelle L. Pirzadeh,
Acting Regional Administrator, Region 10.

    For the reasons set forth in the preamble, 40 CFR part 52 is 
amended as follows:

PART 52--APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS

0
1. The authority citation for part 52 continues to read as follows:

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

Subpart N--Idaho

0
2. In Sec.  52.670, the table in paragraph (e) is amended by adding an 
entry at the end of the table for ``Interstate Transport Requirements 
for the 2010 Sulfur Dioxide NAAQS'' to read as follows:

[[Page 18459]]

Sec.  52.670  Identification of plan.

* * * * *
    (e) * * *

                    EPA-Approved Idaho Nonregulatory Provisions and Quasi-Regulatory Measures
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                                  Applicable geographic        State
     Name of SIP provision        or nonattainment area   submittal date   EPA approval date       Comments
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                                                  * * * * * * *
Interstate Transport             State-wide.............      12/24/2015  4/9/2021, [Insert   This action
 Requirements for the 2010                                                 Federal Register    addresses CAA
 Sulfur Dioxide NAAQS.                                                     citation].          110(a)(2)(D)(i)(I
                                                                                               ).
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[FR Doc. 2021-07333 Filed 4-8-21; 8:45 am]
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