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### Docket Index Docket No. EPA - R09 - OAR - 201 5 - 0279 Notice of Final Rulemaking Mammoth Lakes PM10 Redesignation Request and Maintenance Plan September 21, 2015 A . Rulemaking Documents A - 1. Docket Index, Docket No. EPA - R09 - OAR - 201 5 - 0279 , Notice of Final Rulemaking , Mammoth Lakes PM10 Redesignation Request and Maintenance Plan , September 21, 2015 . A - 2. Docket Index, Docket No. EPA - R09 - OAR - 201 5 - 0279 , Notice of Proposed Rulemaking , Mammoth Lakes PM10 Redesignation Request and Maintenance Plan , Ju ly 9, 2015 . A - 3. Proposed Rule. Air Plan Approval ; California; Mammoth Lakes; Redesignation Request ; PM10 Maintenance Plan ; signed July 10, 2015 , prepublication version . A - 4. Final R ule. Air Plan Approval ; California; Mammoth Lakes; Redesignation Request; PM10 Maintenance Plan ; signed September 18, 2015, prepublication version . B . State Submittals B - 1. Submittal Letter , Richard Corey , Executive Officer, California Air resources Board ( CARB ) to Jared Blumenfeld, Regional Administrator, EPA Region 9, October 21, 2014 , with enclosures. a. CARB Resolution No. 1 4 - 27 , September 18, 2014 . b. CARB Notice of Public Meeting , dated August 8, 2014, to consider approval of the Town of Mammoth Lakes PM10 Maintenance Plan and redesignation request on September 18, 2014 . c. CARB, “ Staff Report Town of Mammoth Lakes PM10 Maintenance Plan and Redesignation Request , ” August 18, 2014 . d. CARB Completeness Checklist for SIP Revision, Mammoth Lakes PM10 Maintenance Plan and Redesignation Request. e. CARB Partial Hearing Transcript, Board Hearing, September 18, 2014. f. Transmittal Letter, Duane Ono , Great Basin Unified Air Pollution Control District ( GBUA PCD) to Richard Corey , CARB, May 22, 2014 . i. Proof of Publication, dated May 22, 2014 for the GBUAPCD Notice of a Public Hear ing for the Adoption of the “2014 Update Air Quality Maintenance Plan and Redesignation Request for the Town of Mammoth Lakes” on May 5, 2014. (Enclosure 1) ii. GBUAPCD, Staff Report, Air Quality Maintenance Plan and PM10 Redesignation Request for the Town of Mammoth Lakes and Revisions to District Rule 431 - Particulate Emissions , May 5, 2014 . (Enclosure 2)Index : Docket Number EPA - R09 - OAR - 201 5 - 0 279 Page 2 of 4 iii. GBUAPCD Board Order #140505 - 03, May 5, 2014. (Enclosure 3) iv. GBU APCD “2014 Update Air Quality Maintenance Plan and Redesignation Request for the Town of Mammoth Lakes” (Mammoth Lake s PM10 Maintenance Plan) , as adopted May 5, 2014 . (Enclosure 4) C . Past EPA Actions, Memoranda, and Guidance Documents C - 1. 52 FR 2 4633, July 1, 1987 . Promulgation of the PM10 National Ambient Air Quality Standard (NAAQS). C - 2. 71 FR 61144, O ctober 17, 2006 . Promulgation of PM10 NAAQS, retention of 24 - hour standard and revocation of annual standard . C - 3. 78 FR 3 086 , J anuary 15, 2013 . Promulgation of PM10 NAAQS, retention of 24 - hour standard . C - 4. 56 FR 11101, March 15, 1991 . Air Quality Designations and Classifications for the PM10 NAAQS ; Designations of initial PM10 areas upon enactment of the Clean Air Act. C - 5. 61 FR 32341 , June 24, 1996 . Approval of Mammoth Lakes 1990 PM10 Air Quality Management Plan, GBUAPCD Rule 431

– Part iculate Emissions, and Town of Mammoth Lake Mun i cipal Code 8.3, Particulate Emissions Regulations. C - 6. 7 2 FR 6152 5 , October 31, 2007 . Approval of amendments to GBUAPCD Rule 431

– Particulate Emissions. C - 7. 57 FR 13498, A pril 16, 1992. State Implementation Plans; General Preamble for the Implementation of Title I of the Clean Air Act Amendments of 1990 . C - 8. 57 FR 18070 , April 28, 1992 . Supplement to the General Preamble . C - 9. Memorandum , “Proc edures f or Processing Requests to Redesignate Areas to Attainment , ” dated of September 4, 1992, from John Calcagni, USEPA

– Office of Air Quality Planning and Standards . C - 10. 68 FR 25418 , May 12, 2003 . Discussion of EPA’s reliance on prior approval actions when approving a redesignation request. C - 11. 7 5 FR 36023 , June 24, 2010 . Discussion of relevant Section 110 and Part D requirements that are relevant when reviewing a redesignation request at 36026. C - 12. 47 FR 263 79 , June 18, 1982 . EPA Approval of GBUAPCD Rule 209 - A. C - 13. 41 FR 53661 , December 8, 1976 . EPA approval of GBUAPCD Rule 216. C - 14. Memorandum, “Part D NSR Requirements for Areas Requesting Redesignation to Attainment,” dated October 14, 1994, from Mary Nichols, Assistant Admin istrator for Air and Radiation. C - 15. 60 FR 12 4 59, March 7, 1995. Discussion of EPA determination that a New Source Review program does not have to be approved prior to redesignation . See pages 12467 - 12468. a. 61 FR 20458, May 7, 1996. See pages 20469 - 20470. b. 66 FR 53665, October 23, 2001. See page 53669. c. 61 F R 31831, June 21, 1996. See pages 31836 - 31837. d. 61 FR 20458, May 7, 1996 . See pages 20469 - 20470. e. 73 FR 22307, April 25, 2008. See page 22313. f. 73 FR 66759, N ovember 12, 2008. See pages 66766 - 66767. C - 16. 64 FR 19916 , April 23, 1999 . EPA approval of GBUAPCD Regulation 13. C - 17. 60 FR 62748 , December 7, 1995 . Discussion of EPA determination that conformity SIP requirements do not apply for the purposes of redesignation. C - 18. 66 FR 5001, January 18, 2001. National emissions standards for heavy - duty diesel truck s.Index : Docket Number EPA - R09 - OAR - 201 5 - 0 279 Page 3 of 4 C - 19. 63 FR 56968, October 23, 1998. National emissions standards for new construction and farm equipment. C - 20. 69 FR 38958, June 29, 2004. National Tier 4 non - road diesel engine standards. C - 21. 63 FR 18978, April 16, 1998. National locomotive engine standards. C - 22. 73 FR 37096, June 30, 2008. National locomotive engine standards. C - 23. 62 FR 15844, April 3, 1997. Discussion of EPA contingency provisions policy. a. 62 FR 6627 9 , December 18, 1 997. b. 66 FR 30811, June 8, 2001. c. 66 FR 586, January 3, 2001. d. 66 FR 634, January 3, 2 001. C - 24. 60 FR 27028, May 22, 1995. Discussion of reliance on pre - implemented contingency provisions. C - 25. 73 FR 66759, November 12, 2008 . Discussion of reliance on pre - implemented contingency provisions. C - 26. 58 FR 62188, November 24, 1993. Explanation of motor vehicle emissions budget and transportation conformity. C - 27. 78 FR 14533 , March 6, 2013. EPA approval of California’s mobile source emissions model EMFAC2011. D. Supporting Information and Analyses D - 1. Letter from Theodore D. Schade, Air Pollution Control Officer, GBUAPCD, to Jared Blumenfeld, Regional Administrator, U.S. EPA Region IX, certifying calendar year 20 09 ambient air quality data and quality assurance data, dated June 1, 201 0 . D - 2. Letter from Theodore D. Schade, Air Pollution Control Officer, GBUAPCD, to Jar ed Blumenfeld, Regional Administrator, U.S. EPA Region IX, certifying calendar year 201 0 ambient air quality data and quality assurance data, dated May 31, 2011 . D - 3. Letter from Theodore D. Schade, Air Pollution Control Officer, GBUAPCD, to Jared Blumenfeld, Regional Administrator, U.S. EPA Region IX, certifying calendar year 201 1 ambient air quality data and quality assurance data, dated April 20, 2012 . D - 4. Letter from Theodore D. Schade, Air Pollution Control Officer, GBUAPCD, to Jared Blumenfeld, Regional Admi nistrator, U.S. EPA Region IX, certifying calendar year 201 2 ambient air quality data and quality assurance data, dated April 25, 201 3 . D - 5. Letter from Theodore D. Schade, Air Pollution Control Officer, GBUAPCD, to Jared Blumenfeld, Regional Administrator, U. S. EPA Region IX, certifying calendar year 2013 ambient air quality data and quality assurance data, dated April 25, 2014. D - 6. Letter from Phillip L. Kiddoo , Air Pollution Control Officer, GBUAPCD, to Jared Blumenfeld , Regional Administrator, U.S. EPA Region IX, certifying calendar year 2014 ambient air quality data and quality assurance data, dated May, 11 , 2015. D - 7. Letter from Joseph Lapka, EPA to T ed Schade , GBUAPCD reviewing 20 09 Annual Network Plan , dated December 1, 2009. D - 8. Letter from Matthew Lakin, EPA to Ted Schade, GBUAPCD reviewing 2010 Annual Network Plan, dated October 29, 2010. D - 9. Letter from Matthew Lakin, EPA to Ted Schade, GBUAPCD reviewing 2011 Annual Network Plan, dated December 20, 2011. D - 10. Letter from Matthew Lakin, EPA to Ted Schade, GBUAPCD reviewing 2012 Annual Network Plan, dated April 18, 2013 . D - 11. Letter from Meredith Kurpius , EPA to Ted Schade, GBUAPCD reviewing 2013 Annual Network Plan, dated May 20, 201 4.Index : Docket Number EPA - R09 - OAR - 201 5 - 0 279 Page 4 of 4 D - 12. Letter from Meredith Kurpius, EPA to Ted Schade , GBUAPCD reviewing 2014 Annual Network Plan, dated October 27, 2014. D - 13. Technical System Audit of the Primary Quality Assurance Organization, California Air Resources Board , dated August 18, 2008. Audit c onducted by EPA Region 9. D - 14. “Technical Support Document for Determination of Attainment and Redesignation of the Mammoth Lakes PM10 Nonattainment Area : Data Analysis Addressing 2012 Incomplete Data,” Environmental Protection Agency

– Region 9, Air Quality Analysis Office, Jennifer Williams and Gwen Yoshimura , April 30, 2015. D - 15. EPA, Air Quality System Design Value Reports, April 30, 2015. D - 16. EPA, Air Quality System Raw Data Report, Mammoth Lakes PM10 Monitors, 2009 - 2014, May 7, 2015. D - 17. Memorandum: “ EPA’s Adequacy Review of Motor Vehicle Emissions Budgets in Mammoth Lakes PM10 Maintenance Plan,” July 1, 2015 . D - 18. EPA, Air Quality System Quick Look Report for 2015 , Septemb er 4, 2015. D - 19. EPA, Air Quality System Raw Data Report, Mammoth Lakes PM10 Monitors, January - March 2015 , September 4, 2015. E. Public Comments We received no comment on our proposed rule.