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Federal Register / Vol. 86, No. 152 / Wednesday, August 11, 2021 / Proposed Rules
ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 52
EPAR10OAR20200649; FRL878801
R10

Air Plan Approval; AK; Juneaus Mendenhall Valley Second 10-Year PM10 Limited Maintenance Plan Environmental Protection Agency EPA.
ACTION: Proposed rule.
AGENCY:

The Environmental Protection Agency EPA is proposing to approve the Juneau, Mendenhall Valley, Alaska AK limited maintenance plan LMP
submitted on November 10, 2020, by the Alaska Department of Environmental Conservation ADEC or the State.
This plan addresses the second 10-year maintenance period beyond redesignation for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers PM10. A LMP is used to meet Clean Air Act CAA requirements for formerly designated nonattainment areas that meet certain qualification criteria. The EPA is proposing to determine that Alaskas LMP meets CAA requirements.
The plan relies upon control measures contained in the first 10-year maintenance plan and the determination that the Mendenhall Valley area currently monitors PM10
levels well below the PM10 National Ambient Air Quality Standards NAAQS or the standard.
DATES: Comments must be received on or before September 10, 2021.
ADDRESSES: Submit your comments, identified by Docket ID No. EPAR10
OAR20200649, at https
www.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, the full EPA public comment policy,
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SUMMARY:

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information about CBI or multimedia submissions, and general guidance on making effective comments, please visit https www.epa.gov/dockets/
commenting-epa-dockets.
FOR FURTHER INFORMATION CONTACT:
Christi Duboiski, EPA Region 10, 1200
Sixth Avenue, Suite 155, Seattle, WA
98101, at 360 7539081, or duboiski.christi@epa.gov.
SUPPLEMENTARY INFORMATION:
Throughout this document, wherever we, us or our is used, it means the EPA.

the PM10 NAAQS as of the extended attainment date of December 31, 1995
75 FR 41379. On May 9, 2013, the EPA
took direct final action to approve the LMP submitted by the State for the Mendenhall Valley NAA and concurrently redesignated the area to attainment for the PM10 NAAQS 78 FR
27071.
The purpose of the States November 10, 2020 LMP is to fulfill the second 10year planning requirement of CAA
section 175Ab to ensure PM10 NAAQS
compliance through 2033.

Table of Contents
II. Limited Maintenance Plan Option for PM10 Areas
I. Background II. Limited Maintenance Plan Option for PM10 Areas A. Requirements for the Limited Maintenance Plan Option B. Conformity Under the Limited Maintenance Plan Option III. Review of the States Submittal A. Qualifying for the Limited Maintenance Plan Option B. Attainment Inventory C. Air Quality Monitoring Network D. Verification of Continued Attainment E. Contingency Provisions IV. Proposed Action V. Statutory and Executive Order Reviews
I. Background On August 7, 1987, the EPA
designated the City of Juneau, Mendenhall Valley area Mendenhall Valley as a PM10 nonattainment area NAA due to measured violations of the 24-hour PM10 NAAQS 52 FR 29383.
The publication announcing the designation upon enactment of the 1990
CAA Amendments was published on March 15, 1991 56 FR 11101. On November 6, 1991, the Mendenhall Valley NAA was subsequently classified as moderate under sections 107d4B
and 188a of the CAA 56 FR 56694.
ADEC worked with the City of Juneau and the community of Mendenhall Valley to develop a plan to bring the area into attainment no later than December 31, 1994. The State submitted the plan to the EPA on June 22, 1993, as a moderate PM10 State Implementation Plan SIP under section 189a of the CAA. The primary control measures the plan relied on were a wood smoke control program and paving unpaved roads to control fugitive dust. The EPA took final action to approve the States moderate PM10
SIP on March 24, 1994 59 FR 13884.
On May 8, 2009, the State requested the EPA redesignate the Mendenhall Valley NAA to attainment for PM10 and submitted the Mendenhall Valley PM10
LMP to the EPA for approval. On July 16, 2010, the EPA determined the Mendenhall Valley NAA had attained
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A. Requirements for the Limited Maintenance Plan Option Section 175A of the CAA sets forth the elements of a maintenance plan.
Under section 175A, a state must submit a plan to demonstrate continued attainment of the applicable NAAQS for at least 10 years after an area is redesignated to attainment. The state must then submit a revised maintenance plan demonstrating that the area will continue to attain for the 10 years following the initial 10-year period. On September 4, 1992, the EPA issued guidance on the content of a maintenance plan Memorandum from John Calcagni, Director, Air Quality Management Division, entitled Procedures for Processing Requests to Redesignate Areas to Attainment, Calcagni Memo.1 The Calcagni Memo states that a maintenance plan should include the following provisions: 1 An attainment emissions inventory; 2 a maintenance demonstration showing maintenance for 10 years; 3 a commitment to maintain the existing monitoring network; 4 verification of continued attainment; and 5 a contingency plan to prevent or correct future violations of the NAAQS.
On August 9, 2001, the EPA issued guidance on streamlined maintenance plan provisions for certain moderate PM10 nonattainment areas see Memo from Lydia Wegman, Director, Air Quality Standards and Strategies Division, entitled Limited Maintenance Plan Option for Moderate PM10
Nonattainment Areas LMP Option memo.2 The LMP Option memo 1 The Memorandum from the EPAs Air Quality Management Division Director to EPA Regional Air Directors entitled Procedures for Processing Requests to Redesignate Areas to Attainment, dated September 4, 1992 Calcagni Memo can be found at https www3.epa.gov/ttn/naaqs/
aqmguide/collection/cp2/19920904_calcagni_
process_redesignation_guidance.pdf.
2 The Limited Maintenance Plan Option for Moderate PM10 Nonattainment Areas Memo outlines the criteria for development of a PM10

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