Approval and Promulgation of Air Quality State Implementation Plans; Ajo, Arizona; 
 Redesignation Request and Maintenance Plan for the 1987 24-hour PM10 Standard
                                  Final Rule
                      (Docket No. EPA-R09-OAR-2019-0609)
                                       
Docket Index Table of Contents

A. U.S. EPA Guidance Documents, Policies, and Rulemakings
B. State Plans, Rules, Support Documents, Reports, and Correspondence
C. Additional Documents for Proposed Rulemaking
D. Notices of Proposed Rulemaking and Technical Support Document
E. Public Comments and Related Documents
F. Additional Documents Considered for Final Plan Action
G. Notices of Final Rulemaking, Plan Action

A. U.S. EPA Guidance Documents, Policies, and Rulemakings

 36 FR 8186, National Primary and Secondary Ambient Air Quality Standards (April 30, 1971).
      
 37 FR 10842, Part 52 Approval and Promulgation of Implementation Plans (May 31, 1972).

 38 FR 12702, Part 52 Approval and Promulgation of Implementation Plans  -  State Implementation Plans (May 14, 1973).
      
 40 FR 36577, Arizona; County Regulations for Process Source Control and New Source Review Procedures (August 21, 1975).

 42 FR 46926, Air Pollution Control; State of Arizona, Pima County and Maricopa County Rules and Regulations (September 19, 1977).

 44 FR 21261, Delegating Increased Settlement Authority to Assistant Attorneys General; CFR Correction (April 10, 1979).

 52 FR 24634, Revisions to the National Ambient Air Quality Standards for Particulate Matter (July 1, 1987).

 54 FR 41218, Prevention of Significant Deterioration for Particulate Matter (October 5, 1989).
      
 56 FR 11101, Designations and Classifications for Initial PM-10 Nonattainment Areas (March 15, 1991).

 57 FR 13498, State Implementation Plans; General Preamble for the Implementation of Title I of the Clean Air Act Amendments of 1990 (April 16, 1992).

 57 FR 18070, State Implementation Plans; General Preamble for the Implementation of Title I of the Clean Air Act Amendments of 1990, Supplemental (April 28, 1992).

 58 FR 31622, Prevention of Significant Deterioration for Particulate Matter (June 3, 1993).

 60 FR 12467, Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; State of Michigan (March 7, 1995).

 60 FR 62748, Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; State of Florida Change in National Policy Regarding Applicability of Conformity Requirements to Redesignation Requests (December 7, 1995).

 61 FR 20458, Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Ohio (May 7, 1996).

 61 FR 31831, Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; State of Michigan (June 21, 1996). 

 66 FR 53665, Approval and Promulgation of Air Quality Implementation Plans; Kentucky: Approval of Revisions to State Implementation Plan, Source Specific Requirements, and Nonregulatory Provisions (October 23, 2001).

 68 FR 25418, Determination of Attainment of Ozone Standard, St. Louis Area; Approval and Promulgation of Implementation Plans, and Redesignation of Areas for Air Quality Planning Purposes, State of Missouri (May 12, 2003).

 69 FR 40004, Transportation Conformity Rule Amendments for the New 8-hour Ozone and PM2.5 National Ambient Air Quality Standards and Miscellaneous Revisions for Existing Areas; Transportation Conformity Rule Amendments: Response to Court Decision and Additional Rule Changes; Final Rule (July 1, 2004).

 71 FR 6352, Approval and Promulgation of Implementation Plans; Designation of Areas of Air Quality Planning Purposes; State of Arizona; Finding of Attainment for Ajo Particulate Matter of 10 Microns or Less (PM10) Nonattainment Area; Determination Regarding Applicability of Certain Clean Air Act Requirements (February 8, 2006).

 71 FR 61144, National Ambient Air Quality Standards for Particulate Matter (October 17, 2006).
 73 FR 22307, Approval and Promulgation of Implementation Plans; Designation of Areas for Air Quality Planning Purposes; State of California; PM-10; Revision of Designation; Redesignation of the San Joaquin Valley Air Basin PM-10 Nonattainment Area to Attainment; Approval of PM-10 Maintenance Plan for the San Joaquin Valley Air Basin; Approval of Commitments for the East Kern PM-10 Nonattainment Area (April 25, 2008).

 73 FR 66759, Approval and Promulgation of Implementation Plans; Designation of Areas for Air Quality Planning Purposes; State of California; PM - 10; Revision of Designation; Redesignation of the San Joaquin Valley Air Basin PM - 10 Nonattainment Area to Attainment; Approval of PM - 10 Maintenance Plan for the San Joaquin Valley Air Basin; Approval of Commitments for the East Kern PM - 10 Nonattainment Area (November 12, 2008).

 75 FR 13710, Approval and Promulgation of Implementation Plans; Designation of Areas for Air Quality Planning Purposes; State of California; PM-10; Determination of Attainment for the Coso Junction Nonattainment Area; Determination Regarding Applicability of Certain Clean Air Act Requirements (March 23, 2010).

 75 FR 36023, Approval and Promulgation of Implementation Plans; Designation of Areas for Air Quality Planning Purposes; State of California; PM-10; Redesignation of the Coso Junction Planning Area to Attainment; Approval of PM-10 Maintenance Plan for the Coso Junction Planning Area (June 24, 2010).

 76 FR 10817, Approval and Promulgation of Implementation Plans; State of Nevada; PM-10; Determinations Regarding Attainment for the Truckee Meadows Nonattainment Area and Applicability of Certain Clean Air Act Requirements (February 28, 2011).

 77 FR 31268, Determination of Attainment for the Paul Spur/Douglas PM10 Nonattainment Area, Arizona; Determination Regarding Applicability of Clean Air Act Requirements (May 25, 2012).

 77 FR 66398, Partial Approval and Disapproval of Air Quality Implementation Plans; Arizona; Infrastructure Requirements for Ozone and Fine Particulate Matter (November 5, 2012).

 78 FR 3086, National Ambient Air Quality Standards for Particulate Matter (January 15, 2013). 

 80 FR 47859, Approval and Promulgation of State Implementation Plans; Arizona; Infrastructure Requirements for the 2008 Lead (Pb) and the 2008 8-Hour Ozone National Ambient Air Quality Standards (NAAQS) (August 10, 2015).

 80 FR 67319, Revisions to Air Plan; Arizona; Stationary Sources; New Source Review (November 2, 2015).

 81 FR 68216, Treatment of Data Influenced by Exceptional Events (October 3, 2016).

 83 FR 19631, Air Plan Approval; Arizona; Stationary Sources; New Source Review (May 4, 2018).

 85 FR 25379, Air Plan Approval; Arizona; Maricopa County Air Quality Department and Pima County Department of Environmental Quality, May 1, 2020.
      
 EPA, Air Quality Criteria for Particulate Matter: Volume I of II, October 2004.

 EPA, Air Quality Criteria for Particulate Matter: Volume II of II, October 2004.

 Memorandum dated May 20, 1992, from Joseph W. Paisie, Acting Chief, SO2/Particulate Matter Programs Branch, Office of Air Quality Planning and Standards, U.S. EPA, to Chief, Air Branch, Regions I-X, entitled "TSP Redesignation Request."

 Memorandum dated September 4, 1992, from John Calcagni, Director, Air Quality Management Division, Office of Air Quality Planning and Standards, U.S. EPA, to Air Division Directors, Regions I-X, entitled "Procedures for Processing Requests to Redesignate Areas to Attainment."

 EPA, PM-10 Emission Inventory Requirements, September 1994.

 Memorandum dated October 14, 1994, from Mary D. Nichols, Assistant Administrator for Air and Radiation, U.S. EPA, to Air Division Directors, Regions I-X, entitled "Part D New Source Review (part D NSR) Requirements for Areas Requesting Redesignation to Attainment."

B. State Plans, Rules, Support Documents, Reports, and Correspondence

 Ajo PM10 Redesignation Request and Maintenance Plan, May 3, 2019.

 Letter dated May 8, 2019, from Timothy S. Franquist, Director, Air Quality Division, to Michael Stoker, Regional Administrator, EPA Region IX, Re: "Submittal of the State Implementation Plan Revision  -  Ajo PM10 Redesignation Request and Maintenance Plan."

C. Additional Documents for Proposed Rulemaking

 Letter dated April 13, 2020, from Daniel Czecholinski, Director, Air Quality Division, ADEQ, to Gwen Yoshimura, Manager, Air Quality Analysis Office, EPA Region IX, Subject: "Certification of 2019 Ambient Air Data."
     
 Letter dated April 25, 2019, from Elizabeth Adams, Director, Air Division, EPA Region IX, to Timothy Franquist, Director, Air Quality Division, ADEQ.
     
 Letter dated November 8, 2019, from Gwen Yoshimura, Manager, Air Quality Analysis Office, EPA Region IX, to Daniel Czecholinski, Acting Director, Air Quality Division, ADEQ.

 Ajo PM10 AQS Design Value Report (AMP480) for 2017-2020, accessed May 6, 2020.

 Ajo PM10 Quicklook Report (AMP450) for 2015-2020, accessed May 6, 2020.

 2018 PM10 Design Value Report, accessed May 7, 2020.

 Southwestern Pennsylvania Growth Alliance v. EPA, 144 F.3d 984 (6th Cir. 1998).

 Wall v. EPA, 265 F.3d 426 (6th Cir. 2001).

 Sierra Club v. EPA, 375 F.3d 537 (7th Cir. 2004).

 Assn of Irritated Residents v. EPA, 423 F.3d 989 (9th Cir. 2005).  

D. Notices of Proposed Rulemaking 

 85 FR 34381, Maintenance Plan and Redesignation Request for the Ajo PM10 Planning Area; Arizona (June 4, 2020).

E. Public Comments and Related Documents

E-1.	Comment from Pima County Association of Governments to Docket EPA-R09-OAR-2019-0609 (July 6, 2020).

F. Additional Documents Considered for Final Plan Action

F-1.	85 FR 42726, Air Plan Approval; Arizona; Maricopa County Air Quality Department and Pima County Department of Environmental Quality (July 15, 2020).

G. Notice of Final Rulemaking

G-1.	85 FR 47032, Maintenance Plan and Redesignation Request for the Ajo PM10 Planning Area; Arizona (August 4, 2020).


