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Federal Register / Vol. 86, No. 168 / Thursday, September 2, 2021 / Proposed Rules Comments must be received on or before October 4, 2021.
ADDRESSES: Submit your comments, identified by Docket ID No. EPAR10
OAR20200648, 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, 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 AvenueSuite 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.
DATES:

Table of Contents
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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 Community of Eagle River Eagle River as a PM10
nonattainment area NAA due to measured violations of the 24-hour PM10
NAAQS 52 FR 29383. The notice announcing the designation upon enactment of the 1990 CAA

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Amendments was published on March 15, 1991 56 FR 11101. On November 6, 1991, the Eagle River NAA was subsequently classified as moderate under sections 107d4B and 188a of the CAA 56 FR 56694. After Eagle River was designated nonattainment for PM10, ADEC and the Municipality of Anchorage MOA worked with Eagle River 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 October 15, 1991, as a moderate PM10 State Implementation Plan SIP under section 189a of the CAA. The primary control measure that the plan relied on was a comprehensive road paving program throughout the Eagle River NAA. The EPA took final action to approve the States moderate PM10 SIP on August 13, 1993 58 FR
43084.
On September 29, 2010, the State requested that the EPA redesignate the Eagle River NAA to attainment for PM10
and submitted the Eagle River first 10year PM10 LMP to the EPA for approval.
On October 19, 2010, the EPA
determined that the Eagle River NAA
had attained the PM10 NAAQS by the applicable attainment date of December 31, 1994 75 FR 64162. On January 7, 2013, the EPA took direct final action to approve the first 10-year LMP submitted by the State for the Eagle River NAA
and concurrently redesignated the area to attainment for the PM10 NAAQS 78
FR 900.
II. Limited Maintenance Plan Option for PM10 Areas 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. Eight years into the first maintenance period, the state must submit a second maintenance plan demonstrating that the area will continue to attain for the following 10year 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 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/

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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 contains a statistical demonstration states can use to show that areas are meeting certain air quality criteria with a high degree of probability, and therefore will maintain the standard 10
years into the future. By providing this statistical demonstration, the EPA can consider the maintenance demonstration requirement of the CAA
to be satisfied for the moderate PM10
nonattainment area meeting this air quality criteria. If the tests described in section IV of the LMP Option memo are met, the EPA will treat that as a demonstration that the area will maintain the NAAQS. Consequently, it follows that future year emission inventories for these areas, and some of the standard analyses to determine transportation conformity with the SIP, are no longer necessary.
To qualify for the LMP option, a State must demonstrate that the area meets the following criteria. First, the area should have attained the PM10 NAAQS.
Second, the most recent five years of air quality data at all monitors in the area, called the 24-hour average design value, should be at or below 98 micrograms per cubic meter mg/m3. Third, the State should expect only limited growth in on-road motor vehicle PM10 emissions and should have passed a motor vehicle regional emissions analysis test. Lastly, the LMP Option Memo identifies core provisions that must be included in all limited maintenance plans. These provisions include an attainment year emissions inventory, assurance of continued operation of an EPAaqmguide/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
limited maintenance plan and can be found at https www.epa.gov/sites/production/files/201606/documents/2001lmp-pm10.pdf.

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