
Docket Index Table of Contents
A.	U.S. EPA Guidance Documents, Policies, and Rulemakings	1
B.	State Plans, Rules, Support Documents, Reports, and Correspondence	3
C.	Additional Documents for Proposed Rulemaking	10
D.	Notice of Proposed Rulemaking	12
E.	Public Comments and Related Documents	12
F.	Additional Documents for Final Rulemaking	12
G.	Notice of Final Rulemaking	12


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

Guidance Documents and Policies

    Memorandum from John Calcagni, Director, Air Quality Management Division, EPA Office of Air Quality Planning and Standards, entitled "Procedures for Processing Requests to Redesignate Areas to Attainment," September 4, 1992.
    "PM10 Emissions Inventory Requirements," EPA-454/R-94-033 (September 1994).
    "Guideline on Data Handling Conventions for the PM NAAQS," EPA-454/R-99-009 (April 1999).
    EPA's draft "PM2.5 Precursor Demonstration Guidance," released for public review and comment on November 17, 2016.
    "Emissions Inventory Guidance for Implementation of Ozone and Particulate Matter National Ambient Air Quality Standards (NAAQS) and Regional Haze Regulations," EPA-454/B-17-002, May 2017.  // Emissions Inventory Guidance for Implementation of Ozone and Particulate Matter National Ambient Air Quality Standards (NAAQS) and Regional Haze Regulations" (July 2017) ("EPA 2017 EI Guidance") 
    "PM2.5 Precursor Demonstration Guidance," (Final), May 30, 2019. 
Rulemakings
    52 FR 24634 (July 1, 1987). Revisions to the National Ambient Air Quality Standards for Particulate Matter.
    52 FR 29383 (August 7, 1987). List of PM10 Group I and Group II Areas.
    57 FR 13498 (April 16, 1992). State Implementation Plans; General Preamble for the Implementation of Title I of the Clean Air Act Amendments of 1990, ("General Preamble"); Final rule. 
    56 FR 56694 (November 6, 1991). Designation of Areas for Air Quality Planning Purposes.
    57 FR 18070 (April 28, 1992). State Implementation Plans; General Preamble for the Implementation of Title I of the Clean Air Act Amendments of 1990; Supplemental.
    59 FR 41998 August 16, 1994, "State Implementation Plans for Serious PM10 Nonattainment Areas, and Attainment Date Waivers for PM10 Nonattainment Areas Generally; Addendum to the General Preamble for the Implementation of Title I of the Clean Air Act Amendments of 1990).
    60 FR 62748 (December 7, 1995). 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.
    Approval and Promulgation of State Implementation Plan; Indiana; Direct final rule. 62 FR 15844 (April 3, 1997).
    64 FR 19916 (April 23, 1999). Approval and Promulgation of Implementation Plans for Arizona and California; General Conformity Rules.
    67 FR 69141 (November 15, 2002). Motor Vehicle Emissions Budgets in Progress, Attainment, and Maintenance State Implementation Plans for Ozone, Carbon Monoxide, and Nitrogen Dioxide; California; Final rule. 
    68 FR 19316 (April 18, 2003). Approval and Promulgation of State Implementation Plans; California -- South Coast; Final Rule.
    68 FR 19318 (April 18, 2003). Approval and Promulgation of State Implementation Plans and Designation of Areas for Air Quality Planning Purposes; California -- Coachella Valley; Final Rule.
    68 FR 25418, 25426 (May 12, 2003). 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.
    69 FR 48972 (August 11, 2004). Finding of Failure to Attain and Reclassification to Serious Nonattaiment; Imperial Valley Planning Area; California; Particulate Matter of 10 Microns or Less.
    70 FR 43663 (July 28, 2005). Approval and Promulgation of State Implementation Plans for Air Quality Planning Purposes -- South Coast and Coachella; Proposed Rule. 
    70 FR 69081 (November 14, 2005). Approval and Promulgation of State Implementation Plans for Air Quality Planning Purposes -- South Coast and Coachella; Final Rule. 
    71 FR 61144 (October 17, 2006). National Ambient Air Quality Standards for Particulate Matter.
    72 FR 13560 (March 22, 2007). Treatment of Data Influenced by Exceptional Events.
    72 FR 70222 (December 11, 2007). Finding of Failure to Attain; California -- Imperial alley Nonattainment Area; PM-10.
    73 FR 12639 (March 10, 2008). Revisions to the California State Implementation Plan, South Coast Air Quality Management District; Final rule. 
    75 FR 36023, 36026 (June 24, 2010). 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.
    75 FR 39366 (July 8, 2010). Revisions to the California State Implementation Plan, Imperial County Air Pollution Control District; Final rule. 
    77 FR 13495 (March 7, 2012). Revisions to the California State Implementation Plan, South Coast Air Quality Management District; Final rule.  
    78 FR 3086 (January 15, 2013).
    78 FR 16792 (March 19, 2013). Designation of Areas for Air Quality Planning Purposes; State of California; Imperial Valley Planning Area for PM10; Clarification of Nonattainment Area Boundary.
    78 FR 20868 (April 8, 2013). Approval and Promulgation of State Implementation Plans; Designation of Areas for Air Quality Planning Purposes; State of California; PM10 Redesignation of the South Coast Air Basin to Attainment; Approval of PM10 Redesignation Request and Maintenance Plan for the South Coast Air Basin; Proposed rule. 
    78 FR 23677 (April 22, 2013). Revisions to the California State Implementation Plan, Imperial County Air Pollution Control District; Final rule.
    78 FR 38233 (June 26, 2013). Approval and Promulgation of State Implementation Plans; Designation of Areas for Air Quality Planning Purposes; California; South Coast Air Basin; Approval of PM10 Maintenance Plan and Redesignation to Attainment for the PM10 Standard; Final rule.
    81 FR 68216 (October 3, 2016). Treatment of Data Influenced by Exceptional Events; Final rule. 
    84 FR 41717 (August 15, 2019).
    August 29, 2019 (84 FR 45418). Air Plan Approval; California; Imperial County Air Pollution Control District; Final rule.
    80 FR 77337 (December 14, 2015). Official Release of EMFAC2014 Motor Vehicle Emission Factor Model for Use in the State of California; Notice of availability. 



    State Plans, Rules, Support Documents, Reports, and Correspondence 
    South Coast AQMD Rule 103, "Definition of Geographical Areas." Adopted January 9, 1976.
    April 24, 2017 Email from Theresa Najita, CARB, to Michael Flagg and Jennifer Williams, EPA; Subject: Revised Exceptional Event Initial Notification Information Form Submittal  -  Imperial County 2014  -  2016.
 Attachment A
    August 29, 2017 CARB submittal letter for Imperial Exceptional Event on January 31, 2014 (Phase 1, Submittal 1), with enclosures.
    December 21, 2017 CARB submittal letter for Imperial Exceptional Events on February 28, 2014; March 17, 2014; March 30  -  April 1, 2014; April 24, 2015; and May 7, 2015, with enclosures (Phase 1, Submittal 2).
 November 8, 2017 ICAPCD letter to CARB re February 28, 2014, with associated documents.
 November 14, 2017 ICAPCD letter to CARB re March 17, 2014, with associated documents.
 November 20, 2017 ICAPCD letter to CARB re March 30  -  April 1, 2014, with associated documents
 November 8, 2017 ICAPCD letter to CARB re April 24, 2015, with associated documents
 November 9, 2017 ICAPCD letter to CARB re May 7, 2015, with associated documents
            


    April 23, 2018 CARB submittal letter for Imperial Exceptional Events on March 26, 2014; May 18, 2015; May 21  -  22, 2015; January 31  -  February 1, 2016 (Phase 1, Submittal 3)
 Exceptional events demonstration for March 26, 2014, with associated documents.
 March 19, 2018 ICAPCD letter to CARB re May 18, 2015, with associated documents.
 March 19, 2018 ICAPCD letter to CARB re May 21-22, 2015, with associated documents.
 March 19, 2018 ICAPCD letter to CARB re January 31  -  February 1, 2016, with associated documents.
    July 17, 2018 Email from Theresa Najita, CARB, to Michael Flagg and Jennifer Williams, EPA; Subject: Exceptional Event Initial Notification Information Form Submittal  -  Imperial County 2015  -  2017.
 Attachment A. 2015-2017
 Attachment B. 2014-2016
    October 25, 2018 CARB submittal letter for Imperial Exceptional Events on April 12-13, 2014; April 24-25, 2014; May 5-6, 2014; May 11, 2014; May 20, 2014; June 26, 2014; July 16, 2014; August 18, 2014; September 27, 2014; October 31  -  November 1, 2014; November 16, 2014. (Phase 1, Submittal 4).
 Exceptional events demonstration for April 12 - 13, 2014, with associated documents.
 Exceptional events demonstration for April 25 - 26, 2014, with associated documents.
 Exceptional events demonstration for May 5  -  6, 2014, with associated documents.
 Exceptional events demonstration for May 11, 2014, with associated documents.
 Exceptional events demonstration for May 20, 2014, with associated documents.
 Exceptional events demonstration for June 26, 2014, with associated documents.
 Exceptional events demonstration for July 16, 2014, with associated documents.
 Exceptional events demonstration for August 18, 2014, with associated documents.
 Exceptional events demonstration for September 27, 2014, with associated documents.
 Exceptional events demonstration for October 31  -  November 1, 2014, with associated documents.
 Exceptional events demonstration for November 16, 2014, with associated documents.

    December 12, 2018 CARB submittal letter for Imperial Exceptional Events on June 30, 2015; July 8, 2015; September 14, 2015; October 1, 2015; October 4, 2015; November 2, 2015; November 25, 2015; December 14, 2015; December 26, 2015 (Phase 1, Submittal 5)
 Exceptional events demonstration for June 30, 2015, with associated documents
 Exceptional events demonstration for July 8, 2015, with associated documents
 Exceptional events demonstration for September 14, 2015, with associated documents
 Exceptional events demonstration for October 1, 2015, with associated documents
 Exceptional events demonstration for October 4, 2015, with associated documents
 Exceptional events demonstration for November 2, 2015, with associated documents
 Exceptional events demonstration for November 25, 2015, with associated documents
 Exceptional events demonstration for December 14, 2015, with associated documents
 Exceptional events demonstration for December 26, 2015, with associated documents

    December 18, 2018 CARB submittal letter for Imperial Exceptional Events on March 6, 2016; March 11, 2106; March 28, 2016; April 14, 2016; April 22, 2016; April 24-25, 2016; May 5, 2016; May 15, 2016; May 20-21, 2016; May 25, 2016; July 23-24, 2016; July 30, 2016; August 9, 2016; August 19-21, 2016; September 3, 2016; September 12-13, 2016; September 19, 2016; October 30, 2016; December 16, 2016. (Phase 1, Submittal 6).
 Exceptional events demonstration for March 6, 2016, with associated documents
 Exceptional events demonstration for March 11, 2016, with associated documents
 Exceptional events demonstration for March 28, 2016, with associated documents
 Exceptional events demonstration for April 14, 2016, with associated documents
 Exceptional events demonstration for April 22, 2016, with associated documents
 Exceptional events demonstration for April 24-25, 2016, with associated documents
 Exceptional events demonstration for May 5, 2016, with associated documents
 Exceptional events demonstration for May 15, 2016, with associated documents
 Exceptional events demonstration for May 25, 2016, with associated documents
 Exceptional events demonstration for July 23-24, 2016, with associated documents
 Exceptional events demonstration for July 30, 2016, with associated documents
 Exceptional events demonstration for August 9, 2016, with associated documents
 Exceptional events demonstration for August 19-21, 2016, with associated documents
 Exceptional events demonstration for September 3, 2016, with associated documents
 Exceptional events demonstration for September 12-13, 2016, with associated documents
 Exceptional events demonstration for September 19, 2016, with associated documents
 Exceptional events demonstration for October 30, 2016, with associated documents
 Exceptional events demonstration for December 16, 2016, with associated documents
 Exceptional events demonstration for May 20-21, 2016, with associated documents

    February 6, 2019 letter from Richard Corey, Executive Officer, CARB, to Michael Stoker, Regional Administrator, EPA Region IX, transmitting the Imperial County 2018 Redesignation Request and Maintenance Plan for Particulate Matter Less Than 10 Microns in Diameter and additional supporting documents.
 November 9, 2018 Letter from Matt Dessert, APCO, Imperial County Air Pollution Control District, to Michael Benjamin, CARB.
 District Completeness checklist
 2018 Redesignation Request and Maintenance Plan for the 24-Hour PM10 Standard
 District Staff Report
 Air Pollution Control Board Minute Order approving the 2018 PM10 Plan  - Evidence of Public Hearing
 Press affidavit
 CEQA Notice of Categorical Exemption
 CARB Public notice evidence 
 transcript for CARB Public Meeting
 CARB Resolution 18-58
 CARB Staff Report, "Analysis of the Imperial County PM10 Nonattainment Area Redesignation Request and Maintenance Plan."
 Written comment received by CARB, #1
 Written comment received by CARB, #2
 Written comment received by CARB, #3

    July 12, 2019 Email from Sylvia Vanderspek, CARB, to Gwen Yoshimura, Jennifer Williams, and Randall Chang EPA; Subject: FW: Imperial INI to EPA.
 Attachment A. 
    August 12, 2019 Letter from Michael T. Benjamin, Chief, Air Quality Planning and Science Division, CARB, to Mike Stoker, Regional Administrator, EPA Region IX, with enclosures.
    September 9, 2019 Letter from Michael T. Benjamin, Chief, Air Quality Planning and Science Division, CARB, to Elizabeth Adams, Director, Air Division, EPA Region IX, re February 17, 2017  -  May 25, 2017 exceptional events.
    October 3, 2019 Letter from Michael T. Benjamin, Chief, Air Quality Planning and Science Division, CARB, to Elizabeth Adams, Director, Air Division, EPA Region IX, re July 23, 2017  -  December 20, 2017 exceptional events.
    October 4, 2019 Letter from Michael T. Benjamin, Chief, Air Quality Planning and Science Division, CARB, to Elizabeth Adams, Director, Air Division, EPA Region IX, re January 20, 2018  -  April 19, 2018 exceptional events
         
    October 16, 2019 CARB submittal letter for Imperial Exceptional Events on February 17, 2017, March 30, 2017, May 6, 2017, May 15, 2017, and May 25, 2017. (Phase 2, Submittal 1.)  
 Exceptional events demonstration for February 17, 2017, with associated documents
 Exceptional events demonstration for March 30, 2017, with associated documents
 Exceptional events demonstration for May 6, 2017, with associated documents
 Exceptional events demonstration for May 15, 2017, with associated documents
 Exceptional events demonstration for May 25, 2017, with associated documents
    October 29, 2019 CARB submittal letter for Imperial Exceptional Events on July 23, 2017, September 2, 2017, September 13-14, 2017, September 21, 2017, October 20, 2017, and December 20, 2017. 
 Exceptional events demonstration for July 23, 2017, with associated documents
 Exceptional events demonstration for September 2, 2017, with associated documents
 Exceptional events demonstration for September 13-14, 2017, with associated documents
 Exceptional events demonstration for September 21, 2017, with associated documents
 Exceptional events demonstration for October 20, 2017, with associated documents
 Exceptional events demonstration for December 20, 2017, with associated documents
    October 29, 2019 CARB submittal letter for Imperial Exceptional Events on January 20, 2018, February 11, 2018, February 19, 2018, April 11-12, 2018, April 16, 2018, April 19, 2018, April 29  -  May 1, 2018, May 11, 2018, May 25, 2018, June 17, 2018, June 23, 2018, June 28, 2018, July 9, 2018, August 20, 2018, October 3, 2018, October 6, 2018, and November 29, 2018.
 Exceptional events demonstration for January 20, 2018, with associated documents
 Exceptional events demonstration for February 11, 2018, with associated documents
 Exceptional events demonstration for February 19, 2018, with associated documents
 Exceptional events demonstration for April 11-12, 2018, with associated documents
 Exceptional events demonstration for April 16, 2018, with associated documents
 Exceptional events demonstration for April 19, 2018, with associated documents
 Exceptional events demonstration for April 29  -  May 1, 2018, with associated documents
 Exceptional events demonstration for May 11, 2018, with associated documents
 Exceptional events demonstration for May 25, 2018, with associated documents
 Exceptional events demonstration for June 17, 2018, with associated documents
 Exceptional events demonstration for June 23, 2018, with associated documents
 Exceptional events demonstration for June 28, 2018, with associated documents
 Exceptional events demonstration for July 9, 2018, with associated documents
 Exceptional events demonstration for August 20, 2018, with associated documents
 Exceptional events demonstration for October 3, 2018, with associated documents
 Exceptional events demonstration for October 6, 2018, with associated documents
 Exceptional events demonstration for November 29, 2018, with associated documents
    December 6, 2019 Email from Theresa Najita, CARB, to Gwen Yoshimura, EPA; Subject: Imperial PM10 Exceptional Event  -  Revised Appendix C for April 16, 2018 documentation.
 Attachment
    Letter from Wade Crowfoot, Secretary for Natural Resources and Jared Blumenfeld, Secretary for Environmental Protection, California, to Ryan E. Kelly, Imperial County Board of Supervisors, January 6, 2020.
    April 26, 2010 CARB status report on Imperial County Air Quality and Approval of the State Implementation Plan Revision for PM10.
    Arizona Administrative Code, Title 18, Chapter 2.
    Clark County Department of Air Quality (CCDAQ) Fugitive Dust Rules:
 CCDAQ Dust Control Handbook
 CCDAQ Section 0
 CCDAQ Section 41
 CCDAQ Section 90
 CCDAQ Section 91
 CCDAQ Section 92
 CCDAQ Section 93
 CCDAQ Section 94
     Imperial County Air Pollution Control District (ICAPCD) Fugitive Dust Rules:
 ICAPCD Rule 800
 ICAPCD Rule 801
 ICAPCD Rule 802
 ICAPCD Rule 803
 ICAPCD Rule 804
 ICAPCD Rule 805
 ICAPCD Rule 806
    Maricopa County Air Quality Division (MCAQD) Fugitive Dust Rules:
 MCAQD Rule 301.01
 MCAQD Rule 310
    Mojave Desert Air Quality Management District (MDAQMD) Fugitive Dust Rules:
 MDAQMD Rule 401
 MDAQMD Rule 403
 MDAQMD Rule 403.2
    South Coast Air Quality Management District (SCAQMD) Fugitive Dust Rules:
 SCAQMD Rule 403
 SCAQMD Rule 403.1
 SCAQMD Rule 1186
    San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) Fugitive Dust Rules:
 SJVUAPCD Rule 4550
 SJVUAPCD Rule 4550_CMP list
 SJVUAPCD Rule 8011
 SJVUAPCD Rule 8021
 SJVUAPCD Rule 8031
 SJVUAPCD Rule 8041
 SJVUAPCD Rule 8051
 SJVUAPCD Rule 8061
 SJVUAPCD Rule 8071
 SJVUAPCD Rule 8081
    March 28, 2019 email from Webster Tasat, CARB, to Ginger Vagenas, EPA.
 CARB responses to comments regarding Imperial PM10 plan
    October 9, 2018 letter from Dr. Michael Benjamin, CARB, to Elizabeth Adams, EPA with enclosed PM10 mitigation plans.
 High Wind Exceptional Event Fugitive Dust Mitigation Plan for Imperial County 




    Additional Documents for Proposed Rulemaking

    Southwestern Pennsylvania Growth Alliance v. Browner, (144 F.3d 984, 989-990 (6th Cir. 1998).
    Wall v. EPA, F.3d 416 (6th Cir. 2001)
    Sierra Club v. EPA, 375 F.3d 537 (7th Cir. 2004)
    October 22, 2012 letter from Deborah Jordan, Director, Air Division, EPA Region IX, to James Goldstene, Executive Officer, CARB, with enclosed "System Audit of the Ambient Monitoring Program: California Air Resource Board; June  -  September 2011."
    August 31, 2016 letter from Elizabeth Adams, Acting Director, Air Division, EPA Region IX, to Richard Corey, Executive Officer, CARB, with enclosed "System Audit of the Ambient Monitoring Program: California Air Resource Board; April  -  August 2015."
    May 3, 2017 letter from Michael Flagg, Acting Manager, Air Quality Analysis Office, EPA Region IX, to Matt Dessert, Air Pollution Control Officer, ICAPCD.
    November 26, 2018 letter from Gwen Yoshimura, Manager, Air Quality Analysis Office, EPA Region IX to Ravi Ramalingam, Chief, Consumer Products and Air Quality Assessment Branch, CARB, approving CARB's 2018 Annual Network Plan, with enclosures.
    California Air Resources Board  -  CEPAM 2016 Standard Emission Tool; Emission Projections by Summary Category; Particulate Matter < 10 Microns; Riverside County. Pulled September 6, 2019.
    California Air Resources Board  -  CEPAM 2016 Standard Emission Tool; Emission Projections by Summary Category; Particulate Matter < 10 Microns; Imperial County; 2005, 2008, 2011, 2014, 2017. Pulled November 14, 2019.
    November 13, 2019 memorandum from Karina O'Connor, Air Planning Office, EPA Region IX, "Adequacy Documentation for Plan Motor Vehicle Emission Budgets in October 2018 Imperial PM10 Plan" 
    November 20, 2019 letter from Elizabeth Adams, Director, Air and Radiation Division, EPA Region IX, to Thomas Tortez, Chairperson, Torres Martinez Desert Cahuilla Indians, 
    December 3, 2019 letter from Elizabeth Adams Director, Air and Radiation Division, EPA Region IX, to Sylvia Vanderspek, Chief, Air Quality Planning Branch, CARB. (January 31, 2014 EE concurrence.) 
    December 3, 2019 letter from Elizabeth Adams Director, Air and Radiation Division, EPA Region IX, to Sylvia Vanderspek, Chief, Air Quality Planning Branch, CARB. (EE concurrences for February 28, 2014, March 17, 2014, March 30  -  April 1 2014, April 24, 2015, and May 7, 2015.)
    December 3, 2019 letter from Elizabeth Adams Director, Air and Radiation Division, EPA Region IX, to Sylvia Vanderspek, Chief, Air Quality Planning Branch, CARB. (EE concurrences March 26, 2014, May 18, 2015, May 21-22, 2015, and January 31  -  February 1, 2016.)
    December 3, 2019 letter from Elizabeth Adams Director, Air and Radiation Division, EPA Region IX, to Sylvia Vanderspek, Chief, Air Quality Planning Branch, CARB. (EE concurrences for March 6, 2016, March 11, 2016, March 28, 2016, April 14, 2016, April 22, 2016, April 24-25, 2016, May 5, 2016, May 15, 2016, May 20-21, 2016, May 25, 2016, July 23-24, 2016, July 30, 2016, August 9, 2016, August 19 & 21, 2016, September 3, 2016, September 12-13, 2016, September 19, 2016, October 30, 2016, and December 16, 2016.)
    December 3, 2019 letter from Elizabeth Adams Director, Air and Radiation Division, EPA Region IX, to Sylvia Vanderspek, Chief, Air Quality Planning Branch, CARB, dated. (EE concurrences for February 17, 2017, March 30, 2017, May 6, 2017, May 15, 2017, and May 25, 2017.)
    December 5, 2019 letter from Elizabeth Adams, Director, Air and Radiation Division, EPA Region IX, to Jordan D. Joaquin, President, Quechan Tribe of the Fort Yuma Indian Reservation,.
    California Air Resources Board  -  CEPAM 2016 Standard Emission Tool; Emission Projections by Summary Category; Particulate Matter < 10 Microns; Imperial County. Pulled December 5, 2019.
    California Air Resources Board  -  Map of California Air Districts and Counties. (Undated; accessed December 5, 2019.)
    December 27, 2019 letter from Elizabeth Adams Director, Air and Radiation Division, EPA Region IX, to Sylvia Vanderspek, Chief, Air Quality Planning Branch, CARB. (EE concurrences for September 2, 2017, September 13-14, 2017, September 21, 2017, October 20, 2017, and December 20, 2017.)
    EPA Region IX, Technical Systems Audit Final Report of the Ambient Air Monitoring Program: California Air Resources Board, September  -  December 2018. Enclosed with letter from Elizabeth J. Adams, Director, Air and Radiation Division, EPA Region IX, to Richard Corey, Executive Officer, CARB, dated February 3, 2020.
    March 3, 2020 letter from Elizabeth Adams, Director, Air and Radiation Division, EPA Region IX, to Sylvia Vanderspek, Chief, Air Quality Planning Branch, CARB. (EE concurrences for April 12-13, 2014, April 25-26, 2014, May 5-6, 2014, May 11, 2014, May 20, 2014, June 26, 2014, July 16, 2014, August 18, 2014, September 27, 2014, October 31-November 1, 2014, and November 16, 2014.) 
    March 3, 2020 letter from Elizabeth Adams, Director, Air and Radiation Division, EPA Region IX, to Sylvia Vanderspek, Chief, Air Quality Planning Branch, CARB. (EE concurrences for June 30, 2015, July 8, 2015, September 14, 2015, October 1, 2015, October 4, 2015, November 2, 2015, November 25, 2015, December 14, 2015, and December 26, 2015.) 
    March 3, 2020 letter from Elizabeth Adams, Director, Air and Radiation Division, EPA Region IX, to Sylvia Vanderspek, Chief, Air Quality Planning Branch, CARB. (EE concurrences for January 20, 2018, February 11, 2018, February 19, 2018, April 11-12, 2018, April 16, 2018, April 19, 2018, April 29-May 1, 2018, May 11, 2018, May 25, 2018, June 17, 2018, June 23, 2018, June 28, 2018, July 9, 2018, October 3, 2018, October 6, 2018, and November 29, 2018.)
    Memorandum from Ginger Vagenas and Kate Harper, EPA Region IX, to Docket #EPA-R09-OAR-2019-0654, dated March 4, 2020.
    Memorandum from Jennifer Williams, EPA Region IX and Brett Gantt, EPA Office of Air Quality Planning and Standards, to Docket Number EPA-R09-OAR-2019-0654, Subject: Imperial County, CA PM10 Nonattainment Area Design Value Calculations," March 5, 2020.
    AQS Design Value Report (AMP 480), dated March 5, 2020.
    October 22, 2019 County of Imperial Proclamation of Local Emergency for Air Pollution at the Salton Sea.
    November 4, 2019 letter from Tony Rouhotas, Jr., Imperial County Executive Officer, to Governor Gavin Newsom.
    December 4, 2018 letter from Elizabeth J. Adams, EPA, to Dr. Michael Benjamin, CARB, regarding completeness determination of PM10 dust mitigation plans.
    "Salton Sea Windblown Dust Levels and Sources," Earl Withycombe, California Air Resources Board (undated PowerPoint presentation).
    "Salton Sea Emissions Monitoring Program  -  2018/2019 Annual Report and PM10 Emissions Estimates," Prepared by Formation Environmental, LLC. March 2020.

    Notice of Proposed Rulemaking
    PM10 Maintenance Plan and Redesignation Request; Imperial Valley Planning Area, California; Proposed rule; 85 FR 18509 (April 2, 2020).

    Public Comments and Related Documents
    Reserved.
         

    Additional Documents for Final Rulemaking  
    Reserved
         
   
    Notice of Final Rulemaking
    Reserved.
