Technical Support Document

                        for Notice of Final Rulemaking

               Evaluation of the Arizona Infrastructure SIP for

                             2010 NO2 and 2010 SO2

Evaluation of the Arizona Infrastructure State Implementation Plan the 2010 1-hour Nitrogen Dioxide (NO2) and the 2010 1-Hour Sulfur Dioxide (SO2) NAAQS

U.S. EPA, Region 9
July 30, 2018
Introduction.....................................................................................................1
Evaluation Summary	2
Background	3
Element A  -  Emission Limits and Other Control Measures [CAA § 110(a)(2)(A)]	4
Element B  -  Ambient Air Quality Monitoring/Data System [CAA § 110(a)(2)(B)]	9
Element C -  Program for Enforcement of Control Measures and Regulation of New and Modified Stationary Sources [CAA § 110(a)(2)(C)]	10

Element D  -  Interstate Transport [CAA § 110(a)(2)(D)]	17
Element E  -  Adequate Resources and Authority, Conflict of Interest, and Oversight of Local Governments and Regional Agencies [CAA § 110(a)(2)(E)]	22

Element F  -  Stationary Source Monitoring and Reporting [CAA § 110(a)(2)(F)]	30
Element G  -  Emergency Episodes, [CAA § 110(a)(2)(G)]	34
Element H  -  SIP Revisions [CAA § 110(a)(2)(H)]	36
Element I  -  Plan Revisions for Nonattainment Areas [CAA § 110(a)(2)(I)]	37
Element J  -  Consultation with Government Officials; Public Notification; and PSD and Visibility Protection [CAA § 110(a)(2)(J)]	38

Element K  -  Air Quality Modeling and Submission of Modeling Data [CAA § 110(a)(2)(K)]	..41
Element L  - Permitting Fees [CAA § 110(a)(2)(L)]	44
Element M  -  Consultation/Participation by Affected Local Entities [CAA § 110(a)(2)(M)]	46

Introduction
This document summarizes the U.S. Environmental Protection Agency's (EPA) review of the Arizona State Implementation Plan (SIP) provisions and local provisions to meet the requirements of §110(a)(1) and (2) of the Clean Air Act (CAA) for the 2010 nitrogen dioxide (NO2) and 2010 sulfur dioxide (SO2) National Ambient Air Quality Standards (NAAQS). Specifically, this Technical Support Document (TSD) examines information submitted by the Arizona Department of Environmental Quality (ADEQ) on behalf of ADEQ, Maricopa County Air Quality Department (MCAQD or Maricopa County), Pima County Department of Environmental Quality (PDEQ or Pima County), and Pinal County Air Quality Control District (PCAQCD or Pinal County) to EPA in 2013.

On January 18, 2013, ADEQ submitted the "Arizona State Implementation Plan Revision under Clean Air Act Section 110(a)(1) and (2); 2010 NO2 NAAQS" (NO2 I-SIP Submittal) to address all of the CAA section 110(a)(2) requirements, which EPA commonly refers to as an "infrastructure" SIP (I-SIP). Additionally, on July 23, 2013, ADEQ submitted the "Arizona State Implementation Plan Revision under Clean Air Act Section 110(a)(1) and (2); 2010 SO2 NAAQS" (SO2 I-SIP Submittal) to address the SO2 NAAQS. Both submittals became complete by operation of law 6 months after submittal, on July 18, 2013 and January 23, 2014 respectively. On December 3, 2015 ADEQ submitted Arizona State Implementation Plan Revisions for 2008 Ozone and 2010 Nitrogen Dioxide Under Clean Air Act Section 110(a)(2)(D) and Revision for All Previous and Future NAAQS Under CAA Section 110(a)(2)(K), which replaced portions of previous submittals for CAA § 110(a)(2)(D), interstate transport for 2010 NO2 and CAA § 110(a)(2)(K), Air Quality Modeling and Submission of Data, for both the 2010 NO2 and 2010 SO2 NAAQS (hereafter referred to as the "2015 submittal"). We found the 2015 submittal to meet completeness requirements found at 40 CFR 51 Part V.

Based on our evaluation, we proposed at 81 FR 31571 (May 19, 2016) to find that Arizona's 2010 NO2 and SO2 infrastructure submittals are approvable for most I-SIP elements. Where we found that elements are not approvable, the disapprovals will not trigger a deadline for EPA to promulgate federal implementation plans (FIP) because each deficiency is already adequately addressed by a pre-existing FIP.

Corrections in Notice of Final Rulemaking
In our notice of final rulemaking, we are making several administrative changes to clarify inconsistencies between our notice of proposed rulemaking and its accompanying TSD. In the May 16, 2016 action we inadvertently listed several elements under the Proposed Approvals and Partial Approvals section of the notice. The portions of the infrastructure SIP submissions that the EPA listed under the Proposed Approvals and Partial Approvals section of the notice, but instead should have been listed under the Proposed Partial Disapprovals section of the notice, include:

 section 110(a)(2)(C) prevention of significant deterioration (ADEQ and Pinal County);
 section 110(a)(2)(D)(i)(II) interference with prevention of significant deterioration, or prong 3 (ADEQ and Pinal County);
 section 110(a)(2)(D)(ii) interstate pollution abatement (ADEQ and Pinal County); and
 section 110(a)(2)(J) prevention of significant deterioration (ADEQ and Pinal County).

As explained in the TSD, while ADEQ and Pinal County have SIP-approved prevention of significant deterioration (PSD) programs that cover most of the requirements of part C, title I of the Act, they do not have programs that provide for regulating the construction and modification of stationary sources of greenhouse gases (GHGs). Instead, all of Arizona is subject to the federal PSD program at 40 CFR 52.21 for regulation of stationary sources of GHGs. As explained in the EPA's 2013 I-SIP guidance, if a state does not have a fully approved PSD program that covers the requirements for all regulated NSR pollutants, including GHGs, then the EPA cannot fully approve the I-SIP submission for the requirements of 110(a)(2)(C), 110(a)(2)(D)(i)(II), 110(a)(2)(D)(ii), and 110(a)(2)(J). Thus, consistent with the TSD for this action, past actions on Arizona I-SIP submissions, and our 2013 I-SIP guidance, the final action serves to clarify that the SIP submissions are partially approved and partially disapproved for the PSD-related infrastructure requirements of 110(a)(2)(C), 110(a)(2)(D)(i)(II), 110(a)(2)(D)(ii), and 110(a)(2)(J) with respect to ADEQ and Pinal County. The partial disapproval for ADEQ and Pinal County applies only with respect to the fact that these air programs do not have SIP approved rules to regulate sources of GHG emissions, and instead implement a FIP for regulation of sources of GHGs pursuant to a delegation agreement with the EPA.

Evaluation Summary

    Element Identification
          Meets Requirement? (clarification or cause of disapproval)
 Element
                                      Sub-
                                    Element
                                 Description
                                      ADEQ
                                Maricopa County
                                  Pima County
                                  Pinal County
                                      A

Emission limits and other control measures
                                      Yes
                                      Yes
                                      Yes
                                      Yes
                                      B
                                      i
Ambient air quality monitoring/data system
(monitor, compile, analyze data)
                                      Yes
                                      Yes
                                      Yes
                                      Yes

                                      ii
Ambient air quality monitoring/data system (make data available to EPA)
                                      Yes
                                      Yes
                                      Yes
                                      Yes
                                      C

Program for enforcement of control measures
                                      Yes
                                      Yes
                                      Yes
                                      Yes

Regulation of minor sources and minor modifications
                                      Yes
                                      Yes
                                      Yes
                                      Yes

PSD permit program
                               Partial (PSD FIP)
                                      No
                                   (PSD FIP)
                                      No
                                   (PSD FIP)
                               Partial (PSD FIP)
                                       D
                                       i
Interstate transport - significant contribution to nonattainment or interference with maintenance (prongs 1-2)
                                   Yes (NO2)

                                No Action (SO2)

Interstate transport - interference with PSD (prong 3)
                               Partial (PSD FIP)
                                      No
                                   (PSD FIP)
                                      No
                                   (PSD FIP)
                               Partial (PSD FIP)

Interstate transport - visibility transport (prong 4)
                            No (Regional Haze FIP)

                                      ii
Interstate pollution abatement (§126, including requirement to notify states of potential impacts from new sources)
                               Partial (PSD FIP)
                                      No
                                   (PSD FIP)
                                      No
                                   (PSD FIP)
                               Partial (PSD FIP)

International air pollution (§115)
                                      Yes
                                      Yes
                                      Yes
                                      Yes
                                      E
                                      i
Necessary assurances of adequate resources (personnel, funding, authority)
                                      Yes
                                      Yes
                                      Yes
                                      Yes

                                      ii
Conflict of interest provisions (per § 128)
                                      Yes
                                      Yes
                                      Yes
                                      Yes

                                     iii
Necessary assurances of adequate oversight of local governments and regional agencies
                                      Yes
                                     n/a
                                     n/a
                                      n/a
                                      F
                                      i
Stationary source monitoring system (installation, maintenance, replacement)
                                      Yes
                                      Yes
                                      Yes
                                      Yes

                                      ii
Stationary source monitoring system (periodic reports)
                                      Yes
                                      Yes
                                      Yes
                                      Yes

                                     iii
Stationary source monitoring system (correlation of reports with emissions limitations or standards)
                                      Yes
                                      Yes
                                      Yes
                                      Yes
                                      G

Emergency episodes
                                      Yes
                                      Yes
                                      Yes
                                      Yes
                                      H
                                      i
SIP revisions (plan revisions for NAAQS or improved methods of attaining)
                                      Yes
                                      Yes
                                      Yes
                                      Yes

                                      ii
SIP revisions (remedy inadequacies identified by EPA)
                                      Yes
                                      Yes
                                      Yes
                                      Yes
                                      I

Plan revisions for nonattainment areas
                                     n/a
                                     n/a
                                     n/a
                                      n/a
                                      J
                                    § 121
Consultation with government officials
                                      Yes
                                      Yes
                                      Yes
                                      Yes

                                    § 127
Public notification of exceedances
                                      Yes
                                      Yes
                                      Yes
                                      Yes

                                     PSD/
                                  visibility
PSD and visibility protection
                               Partial (PSD FIP)
                                      No
                                   (PSD FIP)
                                      No
                                   (PSD FIP)
                               Partial (PSD FIP)
                                      K
                                      i
Air quality modeling
                                      Yes
                                      Yes
                                      Yes
                                      Yes

                                      ii
Submission of modeling data
                                      Yes
                                      Yes
                                      Yes
                                      Yes
                                      L
                                      i
Permitting fees (reviewing and acting on application)
                                      Yes
                                      Yes
                                      Yes
                                      Yes

                                      ii
Permitting fees (implementing and enforcing permit)
                                      Yes
                                      Yes
                                      Yes
                                      Yes
                                      M

Consultation with/ participation by affected local political subdivisions
                                      Yes
                                      Yes
                                      Yes
                                      Yes

Background
Section 110(a)(1) of the Clean Air Act requires states to submit a plan that provides for the implementation, maintenance, and enforcement of the National Ambient Air Quality Standards
(NAAQS) no later than three years after the promulgation of a new or revised NAAQS. CAA §
110(a)(2) specifies the contents of the required plan, which generally relate to the information and authorities, compliance assurances, procedural requirements, and control measures that constitute the infrastructure of a state's air quality management program. A SIP submittal addressing these requirements is commonly described as an "infrastructure" SIP (I-SIP).

EPA issued a revised NAAQS for 1-hour NO2 on February 9, 2010, and 1-hour SO2 on June 22, 2010. These actions correspondingly triggered requirements for states to submit an I-SIP revision addressing the applicable requirements of section 110(a)(2) within three years of promulgation of each NAAQS.

We have compared the infrastructure SIP submittals identified in the Summary section of this document to the requirements or elements of CAA § 110(a)(2) for each NAAQS. In the following pages, we describe the requirements, summarize the State's submittal, and present our conclusions for the infrastructure SIP elements.

Element A  -  Emission Limits and Other Control Measures [CAA § 110(a)(2)(A)]
Section 110(a)(2)(A) requires I-SIPs to "include enforceable emission limitations and other control measures, means, or techniques (including economic incentives such as fees, marketable permits, and auctions of emissions rights), as well as schedules and timetables for compliance, as may be necessary or appropriate to meet the applicable requirements of this Act."

Arizona's Response to This Requirement for the 2010 NO2 NAAQS
The 2013 NO2 I-SIP submittal states that: ". . . the demonstration of compliance with CAA 110(a)(2)(A) includes the necessary authority for the State and local air quality management programs to adopt and implement control measures and plans to assure attainment and maintenance of the NO2 air quality standards in all of Arizona."

In support of this element, the state of Arizona pointed to the following SIP approved statutes for ADEQ programs: ARS §§ 49-106, "Statewide application of rules"; 49-107 "Local delegation of state authority"; 49-402 "State and county control"; 49-404 "State implementation plan"; 49-406 "Nonattainment area plan"; 49-421. For County Programs they list "Definitions"; 49-424 "Duties of department"; 49-425 "Rules; hearing"; 49-471 "Definitions"; 49-473 "Board of Supervisors"; and 49-479 "Rules; hearing."

Arizona's Response to This Requirement for the 2010 SO2 NAAQS
The 2013 SO2 I-SIP submittal states that: ". . . the demonstration of compliance with CAA 110(a)(2)(A) includes the necessary authority for the State and local air quality management programs to adopt and implement control measures and plans to assure attainment and maintenance of the SO2 air quality standards in all of Arizona."

In support of this element, the state of Arizona pointed to the following SIP approved statutes for ADEQ programs: ARS §§ 49-106, "Statewide application of rules"; 49-107 "Local delegation of state authority"; 49-402 "State and county control"; 49-404 "State implementation plan"; 49-406 "Nonattainment area plan"; 49-421. For County Programs they list "Definitions"; 49-424 "Duties of department"; 49-425 "Rules; hearing"; 49-471 "Definitions"; 49-473 "Board of Supervisors"; and 49-479 "Rules; hearing."

EPA Evaluation
ADEQ's I-SIP submittal contains relevant state statutes providing a range of authorities for the adoption and implementation of state and local programs necessary to address section 110(a)(2)(A) for both NO2 and SO2. The authorities include: statewide application of rules; delegation of authorities to county and regional planning authorities; jurisdiction over source categories; maintaining a state implementation plan; adoption of rules, emission standards, and performance standards; adoption of permits containing enforceable emission limitations, standards, and compliance schedules. These statutes demonstrate the State's overall program authorities to adopt emission limits and standards for regulated pollutants.

Beyond the Arizona statues that ADEQ specifically cites in their NO2 and SO2 infrastructure SIPs, there are additional ADEQ, Maricopa County, Pima County, and Pinal County provisions in the SIP supporting 110(a)(2)(A) by establishing emission limits, control measures, means, or techniques for NO2 and SO2. These provisions confirm that Arizona has enforceable emission limitations and other control measures in the SIP for numerous stationary and fugitive emission sources. Arizona also has fuel standards that limit the emission of oxides of nitrogen (NOx) from mobile sources.

      Arizona Rules in the SIP Supporting 110(a)(2)(A)  -  2010 NO2 NAAQS
      ADEQ Rules
The following Title 18 rules apply statewide except where a county has adopted a rule at least as stringent as the relevant state rule:

  Article 2. Ambient Air Quality Standards; Area Designations; Classifications
  R18-2-202 Nitrogen Oxides (Nitrogen Dioxide)

  Article 3. Permits and Permit Revisions
  R18-2-302.01 Source Registration Requirements

Article 4. Permit Requirements for New Major Sources and Major Modifications to Existing Major Sources
  R18-2-401 Definitions
  R18-2-402 General
  R18-2-404 Offset Standards
R18-2-406 Permit Requirements for Sources Located in Attainment and Unclassifiable
Areas
R18-2-407 Air Quality Impact Analysis and Monitoring Requirements

Article 7. Existing Stationary Source Performance Standards
R18-2-701 Definitions
R18-2-702 General Provisions
R18-2-703 Standards of Performance for Existing Fossil-fuel Fired Steam Generators and
General Fuel-burning Equipment
R18-2-704 Standards of Performance for Existing Portland Cement Plants
R18-2-706 Standards of Performance for Existing Nitric Acid Plants
R18-2-724 Standards of Performance for Fossil-fuel Fired Industrial and Commercial Equipment
R18-2-730 Standards of Performance for Unclassified Sources
R18-2-732 Standards of Performance for Existing Hospital/Medical/Infectious Waste
      Incinerators

Article 9. New Source Performance Standards
R18-2-901 Standards of Performance for New Stationary Sources
R18-2-903 Standards of Performance for Fossil-fuel Fired Steam Generators
R18-2-904 Standards of Performance for Incinerators

Article 10. Motor Vehicles; Inspections and Maintenance
The following Article 10 rule only applies in Maricopa and Pima counties:
R18-2-1001 thru R18-2-1031

Maricopa County Rules
Rule 322 Power Plant Operations
Rule 323 Fuel Burning Equipment from Industrial/Commercial/Institutional Sources
Rule 324 Stationary Internal Combustion Engines
Rule 510 Air Quality Standards

      Pima County Rules
      Chapter III
      Regulation 31 Rule 313 Incinerators Rule
      Regulation 31 Rule 314 Petroleum Liquids
      Regulation 34 Rule 343 Visibility Limiting Standards
      Regulation II Fuel Burning Equipment Rule 7B NOx Emissions

      Chapter IV
      Regulation 40 General Applicability
      Regulation 42 Existing Sources in Compliance
      Regulation VII Standards of Performance for New Stationary Sources

Pinal County Rules
      Chapter 2. Ambient Air Quality Standards
      2-1-060 Nitrogen Dioxide Air Quality Standard

Chapter 3. Permits and Permit Revisions
3-1-082 Emissions Standards and Limitations
3-3-260 Air Quality Impact Analysis and Monitoring Requirements

Chapter 5. Stationary Source Performance Standards
5-2-950 Fossil Fuel Fired Steam Generator Standard Applicability
7-3-1.4(C) Incineration
7-3-1.4(F) Fuel Burning Equipment
7-3-5.1 NO2 Emissions  -  Fuel Burning Equipment
7-3-5.2 NO2 Emissions  -  Nitric Acid Plants

      Arizona Rules in the SIP Supporting 110(a)(2)(A)  -  2010 SO2 NAAQS
      ADEQ Rules
The following Title 18 rules apply statewide except where a county has adopted a rule at least as stringent as the relevant state rule:

  Article 2. Ambient Air Quality Standards; Area Designations; Classifications
  R18-2-202 Sulfur Oxide (Sulfur Dioxide)

  Article 3. Permits and Permit Revisions
  R18-2-313 Existing Source Emission Monitoring

Article 4. Permit Requirements for New Major Sources and Major Modifications to Existing Major Sources
  R18-2-401 Definitions
  R18-2-402 General
  R18-2-404 Offset Standards
  R18-2-406 Permit Requirements for Sources Located in Attainment and Unclassifiable
  Areas
  R18-2-407 Air Quality Impact Analysis and Monitoring Requirements

Article 7. Existing Stationary Source Performance Standards
R18-2-701 Definitions
R18-2-702 General Provisions
R18-2-703 Standards of Performance for Existing Fossil-fuel Fired Steam Generators and
      General Fuel-burning Equipment
R18-2-704 Standards of Performance for Existing Portland Cement Plants
R18-2-705 Standards of Performance for Existing Incinerators
R18-2-707 Standards of Performance for Existing Sulfuric Acid Plants
R18-2-715 Standards of Performance for Existing Primary Copper Smelters; Site Specific
      Requirements
R18-2-715.01 Standards of Performance for Existing Primary Copper Smelters; Compliance and
      Monitoring
R18-2-715.02	Standards of Performance for Existing Primary Copper Smelters; Fugitive
      Emissions
R18-2-724 Standards of Performance for Fossil-fuel Fired Industrial and Commercial
      Equipment
R18-2-730 Standards of Performance for Unclassified Sources
R18-2-732 Standards of Performance for Existing Hospital/Medical/Infectious Waste
      Incinerators

Article 9. New Source Performance Standards
R18-2-901 Standards of Performance for New Stationary Sources
R18-2-903 Standards of Performance for Fossil-fuel Fired Steam Generators
R18-2-904 Standards of Performance for Incinerators

Maricopa County Rules
Rule 322 Power Plant Operations
Rule 323 Fuel Burning Equipment from Industrial/Commercial/Institutional Sources
Rule 324 Stationary Internal Combustion Engines
Rule 510 Air Quality Standards

      Pima County Rules
      Chapter III
      Regulation 31 Rule 313 Incinerators Rule
      Regulation 31 Rule 314 Petroleum Liquids
      Regulation 34 Rule 343 Visibility Limiting Standards
      Regulation II Emissions Prohibited Emissions of Certain Sulfur Compounds
      Regulation II Fuel Burning Equipment Rule 7A SOx Emissions

      Chapter IV
      Regulation 40 General Applicability
      Regulation 42 Existing Sources in Compliance
      Regulation VII Standards of Performance for New Stationary Sources

Pinal County Rules
      Chapter 2. Ambient Air Quality Standards
      2-1-030 Sulfur Oxide Air Quality Standard

Chapter 3. Permits and Permit Revisions
3-1-082 Emissions Standards and Limitations
3-3-260 Air Quality Impact Analysis and Monitoring Requirements

Chapter 5. Stationary Source Performance Standards
5-2-950 Fossil Fuel Fired Steam Generator Standard Applicability
5-22-960 Fossil Fuel Fired Steam Generator Sulfur Dioxide Emission Limitation
5-24-1045 Sulfite Pulp Mills  -  Sulfur Compound Emissions
7-3-1.4(C) Incineration
7-3-1.4(F) Fuel Burning Equipment
      7-3-2.4 SO2 Emissions  -  Sulfuric Acid Plants

Conclusion as to CAA 110(a)(2)(A)
Based on our review of the 2010 NO2 and SO2 I-SIP Submittals, the applicable Arizona SIP, and for the reasons given above, we propose to find that the Arizona SIP meets the requirements of CAA section 110(a)(2)(A) for the 2010 NO2 and SO2 standards.

Element B  -  Ambient Air Quality Monitoring/Data System [CAA § 110(a)(2)(B)]
CAA § 110(a)(2)(B) requires SIPs to "provide for establishment and operation of appropriate devices, methods, systems, and procedures necessary to -- (i) monitor, compile, and analyze data on ambient air quality, and (ii) upon request, make such data available to the Administrator."

ADEQ's Response to This Requirement for the 2010 NO2 NAAQS
Arizona maintains an extensive monitoring network operated by ADEQ, Maricopa County, Pima County, and Pinal County. It is designed to collect, compile, and analyze ambient air quality data in attainment and nonattainment areas throughout the state. Operating agencies track data recovery, quality control and quality assurance parameters for all instruments operated at various network sites. Criteria pollutant concentrations, such as NO2 are measured with instruments meeting EPA certification as Federal Reference or Equivalent Methods. All data collected by NO2 monitors are compared to the NAAQS, statistically analyzed for trends, and recorded quarterly in EPA's Air Quality System.

On February 9, 2010, EPA established "requirements for an NO2 monitoring network that will include monitors at locations where maximum NO2 concentrations are expected to occur, including within 50 meters of major roadways, as well as monitors sited to measure the area-wide NO2 concentrations that occur more broadly across communities." 75 FR 6474. Arizona is working, in consultation with EPA, to install the necessary monitoring systems.

      ADEQ's Response to This Requirement for the 2010 SO2 NAAQS
Arizona maintains an extensive monitoring network operated by ADEQ, Maricopa County, Pima County, and Pinal County. It is designed to collect, compile, and analyze ambient air quality data in attainment and nonattainment areas throughout the state. Operating agencies track data recovery, quality control and quality assurance parameters for all instruments operated at various network sites. Criteria pollutant concentrations, such as SO2 are measured with instruments meeting EPA certification as Federal Reference or Equivalent Methods. All data collected by SO2 monitors are compared to the NAAQS, statistically analyzed for trends, and recorded quarterly in EPA's Air Quality System.

On June 22, 2010 EPA established minimum requirements for SO2 monitoring networks (75 FR 35519). In addition to the information included under Element B in the 2013 SO2 I-SIP submittal, Arizona believes that the information contained in their SO2 boundary recommendations, included as an attachment to the I-SIP, demonstrate that the state's network meets or exceeds the requirements.

EPA Evaluation
Authority and Responsibility
For both the NO2 and SO2 I-SIPs, Arizona refers to statutes and regulations that allow ADEQ and County agencies to perform actions required in Element B. For ADEQ, these are: §49-404 State Implementation Plan, §49-406 Nonattainment Area Plan section (F)(11), §49-422 Powers and Duties sections (A)-(C) and (E)-(F), §49-424 Duties of Department. For County programs it is §49-476.01 Monitoring.

Air Monitoring Network Plans
Arizona and its counties maintain an extensive monitoring network for both 2010 NO2 and SO2, which records collected data in EPA's Air Quality System. Additionally, the state and relevant counties annually submit air monitoring network plans to EPA pursuant to 40 CFR Part 58. In 2013 and 2014, EPA approved the most recent annual ambient air monitoring network plans for each of the agencies, including the following: ADEQ State of Arizona Air Monitoring Network Plan for the Year 2014, Maricopa County Air Quality Department (MCAQD) 2013 Air Quality Network Plan, Pinal County Air Quality Control District (PCAQCD) 2014 Ambient Monitoring Network Plan and 2013 Data Summary, and Pima County Department of Environmental Quality (PDEQ) 2013 Ambient Air Quality Network Plan. There are some limited exceptions explained in our approval letters to ADEQ, MCAQD, PCAQCD and PDEQ where EPA took no action. These exceptions, however, do not alter our conclusion that the agencies operate an appropriate monitoring network to monitor, compile, and analyze ambient air quality data for NO2 and SO2.

Conclusion as to CAA 110(a)(2)(B)
ADEQ and Arizona county air pollution control agencies establish and operate applicable monitoring networks required under the Clean Air Act for the 2010 NO2 and 2010 SO2 NAAQS; submit monitoring plans and data to EPA; obtain EPA approval for modifications to the monitoring network; and operate under statutes and regulations that authorize and require continuation of these practices. For these reasons, we propose to find that Arizona's air monitoring programs and data systems meet the requirements of § 110(a)(2)(B) for the 2010 NO2 and 2010 SO2 NAAQS for the entire state

Element C -  Program for Enforcement of Control Measures and Regulation of New and Modified Stationary Sources [CAA § 110(a)(2)(C)]
Section 110(a)(2)(C) requires SIPs to include a program to provide for enforcement of the measures set forth in Section 110(a)(2)(A), and regulation of the modification and construction of stationary sources, within the areas covered by the plan, as necessary to assure that NAAQS are achieved, including a permit program as required in parts C and D of CAA title I.

EPA evaluated the State's general enforcement authorities to determine if they provided an adequate infrastructure for SIP enforcement statewide of the States' control measures.

EPA also evaluated where the State had a program to provide for regulation of the modification and construction of stationary sources. EPA evaluated only the State's minor NSR programs and certain "structural" elements of the State's PSD programs under part C of CAA title I to determine whether these programs are adequate for infrastructure SIP purposes. EPA evaluated the Arizona SIP with respect to the following specific elements of the PSD program:

      1. Provisions identifying NOx as an ozone precursor consistent with the requirements of EPA's Phase 2 implementation rule for the 1997 8-hour ozone NAAQS, 70 FR 71612 (codified at 40 CFR 51.166(b)(1)(ii), (b)(2)(ii), (b)(23)(i), (b)(49)(i));

      2. Provisions to regulate PM2.5, including condensable PM, and its precursor emissions (sulfur dioxide (SO2) in all areas, and NOx and/or VOC as appropriate), consistent with the requirements of EPA's NSR/PSD implementation rule for the 1997 PM2.5 NAAQS, 73 FR 28321 (codified at 40 CFR 51.166(b)(23)(i), (b)(49)(i));

      3. Provisions to regulate Greenhouse Gases (GHGs) consistent with EPA's regulations and a recent decision by the U.S. Supreme Court, as discussed below.

Regarding GHGs, EPA established that beginning on January 2, 2011, new or modified sources of GHG emissions at or above certain thresholds are required to seek PSD permits. Four of these actions include, as they are commonly called, the "Endangerment Finding" and "Cause or Contribute Finding," which EPA issued in a single final action, the "Johnson Memo Reconsideration," the "Light-Duty Vehicle Rule," and the "Tailoring Rule." Taken together and in conjunction with the CAA, these actions established regulatory requirements for GHGs emitted from new motor vehicles and new motor vehicle engines; determined that such regulations, when they took effect on January 2, 2011, subjected GHGs emitted from stationary sources to PSD requirements; and limited the applicability of PSD requirements to GHG sources on a phased-in basis.

However, on June 23, 2014, the U.S. Supreme Court issued a decision addressing the application of PSD permitting requirements to GHG emissions. The Supreme Court said that EPA may not treat GHGs as an air pollutant for purposes of determining whether a source is a major source required to obtain a PSD permit. The Court also said that EPA could continue to require that PSD permits, otherwise required based on emissions of pollutants other than GHGs, contain limitations on GHG emissions based on the application of Best Available Control Technology (BACT). In order to act consistently with its understanding of the Court's decision, EPA is not currently applying EPA regulations that would require that SIPs include permitting requirements that the Supreme Court found impermissible. Specifically, EPA is not requiring that a state's SIP-approved PSD program require sources to obtain PSD permits when GHGs are the only pollutant (i) that the source emits or has the potential to emit above the major source thresholds, or (ii) for which there is a significant emissions increase and a significant net emissions increase from a modification (e.g. 40 CFR 51.166(b)(48)(v)).

Generally, section 110(a)(2)(C) requires that an infrastructure SIP for the 2010 NO2 and SO2 NAAQS contain SIP-approved PSD, nonattainment New Source Review (NSR), and minor NSR permitting programs adequate to implement these standards. As explained above, however, EPA is not evaluating part D nonattainment area requirements (such as the nonattainment NSR program) in this proposed action because these SIPs are due on a separate schedule under CAA section 172(b). Additionally, EPA is not proposing to approve or disapprove any state rules with regard to the NSR Reform requirements. Past and future action on SIP submittals made for purposes of adopting NSR Reform go through a separate rulemaking process.

Arizona's Response to This Requirement for the 2010 NO2 and SO2 NAAQS
Arizona State and local agencies implement control and enforcement programs for permitted sources of air contaminants and for sources that are not regulated through permit programs (such as open uncontrolled burns, construction, and vacant land).  Each agency that commits to implement an emission limitation or other control measure contained in the SIP is required to specify, in a resolution adopted by the governing body of the agency, its authority for implementing the measure and a program for enforcement of the limitation or measure.

ADEQ and local agencies are authorized to implement preconstruction review and permitting programs under ARS title 49, chapter 3, articles 1, 2, and 3. ADEQ and county regulations implementing these permit program requirements are contained in AAC title 18, Chapter 2, Articles 2 and 4 or relevant county rules.

Authority to enforce permit programs and SIPs is contained in ARS 49-460 through 463 and 49-510 through 513, under which the State or county may issue orders of abatement, and, through the Attorney General or County Attorney, seek injunctive relief for any violations of the air quality programs.

In ADEQ's 2013 NO2 and SO2 I-SIP submittals Arizona outlined their commitment to adopt and submit a SIP revision to update Arizona's New Source Review/Prevention of Significant Deterioration program to fully meet the requirements of CAA section 110(a)(2)(C) for both NAAQS.

On October 29, 2012, ADEQ submitted "New Source Review State Implementation Plan Submission" and on July 2, 2014 submitted "Supplemental Information to 2012 New Source Review State Implementation Plan Submission" ("Arizona NSR Submittals") to address and update the state's NSR program. Accordingly, our review of element C is based in part on EPA's final rule for the Arizona NSR Submittals "Revisions to Air Plan; Arizona; Stationary Sources; New Source Review" 80 FR 67319, November 2, 2015 ("Arizona NSR Final Rule").  In the Arizona NSR Final Rule, EPA finalized a limited approval and limited disapproval of ADEQ's NSR Submittals, which addressed ADEQ's minor NSR program and PSD program, as well as ADEQ's major nonattainment NSR program.

EPA Evaluation
1. Program for enforcement of control measures
Several Arizona statutes in title 49 establish ADEQ's and the three counties' authorities to provide for enforcement of air pollution control measures.  For example, ARS 49-402 ("State and county control") contains general provisions regarding the respective jurisdictions of ADEQ and the counties to issue and enforce permits, among other authorities.  ARS 49-404(A) ("State implementation plan") requires the director of ADEQ to maintain a SIP that "provides for implementation, maintenance and enforcement of national ambient air quality standards and protection of visibility as required by the clean air act."  ARS 49-406 ("Nonattainment area plan") establishes a process for the designation of responsibilities among State, regional, and local agencies to develop, implement, and enforce SIPs for certain nonattainment or maintenance areas (ARS 49-406(A) through (D)), and requires each agency that commits to implement a SIP provision to describe its commitment in a resolution, which must specify, among other things, the agency's legal authority for implementing the limitation or measure and "a program for the enforcement of the limitation or measure" (ARS 49-406(G)).  EPA approved ARS 49-402, 49-404, and 49-406 into the Arizona SIP on June 8, 2000.  65 FR 36353, 36358.  ARS 49-479 authorizes the board of supervisors for each county to adopt rules as it determines are necessary to control air pollution, which rules shall contain standards at "least equal to or more restrictive than those adopted by the director." EPA approved this provision into the Arizona SIP on November 5, 2012. 77 FR 66398.

In addition, ARS 49-422(A) ("Powers and Duties") authorizes ADEQ to require sources of air contaminants to "monitor, sample or perform other studies to quantify emissions of air contaminants or levels of air pollution that may reasonably be attributable to that source" for purposes of determining whether the source is in violation of a control requirement or permit condition, among other things.  ARS 49-476.01 contains similar authorities for Pima, Maricopa, and Pinal counties. These provisions were approved into the Arizona SIP on November 5, 2012. 77 FR 66398.

Finally, ARS 49-460 through 49-463 broadly authorize ADEQ to request compliance-related information from sources, to issue orders of abatement upon reasonable cause to believe a source has violated or is violating an air pollution control requirement, to establish injunctive relief, to establish civil penalties of up to $10,000 per day per violation, and to conduct criminal enforcement, as appropriate through the Attorney General.  ARS 49-510 through 49-513 contain similar authorities for Pima, Maricopa, and Pinal counties.  EPA approved these provisions into the Arizona SIP on November 5, 2012. 77 FR 66398. We note that these State and local enforcement authorities in the Arizona SIP have no effect on EPA's independent authorities under sections 113 and 114 of the Act.

2. Prevention of Significant Deterioration (PSD) permit program
      i. Regulation of Greenhouse Gases (GHGs)
The entire State of Arizona is subject to the Federal PSD program in 40 CFR 52.21 for purposes of regulating the construction and modification of stationary sources of GHGs. Thus, although the Arizona SIP remains deficient with respect to PSD requirements for GHG emission sources, this deficiency is adequately addressed by the incorporation of the Federal PSD program regulations into the SIP for this purpose. 40 CFR 52.144 and 52.37.

      ii. Regulation of ozone precursors
Both the MCAQD and the PDEQ currently implement the Federal PSD program in 40 CFR 52.21 for all regulated NSR pollutants pursuant to delegation agreements.  Thus, all PSD deficiencies are adequately addressed by the incorporation of the Federal PSD program regulations into both agencies' respective portions of the Arizona SIP.  40 CFR 52.144.

As discussed above, on November 2, 2015, EPA finalized a limited approval and limited disapproval of ADEQ's PSD Program as part of its proposed action on ADEQ's NSR Submittals. ADEQ's submitted PSD program covers all regulated NSR pollutants except GHGs, as noted above. 80 FR 67319. ADEQ's PSD program also identifies NOx as an ozone precursor. Thus, the limited approval and limited disapproval of ADEQ's PSD program in the Arizona NSR Proposed Rule corrects a previous deficiency concerning regulation of ozone precursors that was identified by EPA in our 2012 infrastructure SIP action. 77 FR 66398. Our action approved Arizona's Infrastructure SIP for areas under ADEQ jurisdiction with respect to regulation of ozone precursors on this basis.
As part of its Arizona NSR Submittals, ADEQ clarified that they also have jurisdiction over Pinal County's PSD program for all regulated NSR pollutants except GHGs. ADEQ has delegated implementation of the major source program to the Pinal County Air Quality Control District. 80 FR 14044, 14045. Accordingly, we are also proposing to approve Arizona's Infrastructure SIP as to Pinal County with respect to regulation of ozone precursors, due to our limited approval and limited disapproval.
In our Arizona NSR Final Rule, EPA finalized a limited approval and limited disapproval of ADEQ's NSR Submittals, including the PSD portion of those submittals, based on a number of specific deficiencies EPA identified with the programs as compared with specific statutory and regulatory requirements for NSR SIP submittals.
On May 4, 2018, we finalized approval of ADEQ rule revisions to correct certain deficiencies that were identified in the November 2, 2015 action, including approval of PSD increments for PM2.5. 83 FR 19631.
The approval of ADEQ's 2013 NO2 and SO2 I-SIP submittals with respect to regulation of ozone precursors under ADEQ's PSD program evaluates basic structural components of the Arizona SIP, and is not intended to, nor should it be construed to, evaluate or address whether ADEQ's PSD program meets specific statutory and regulatory requirements for SIP-approved NSR programs.
      iii. Regulation of PM2.5 (including condensable PM) and its precursors
Both the MCAQD and the PDEQ currently implement the Federal PSD program in 40 CFR 52.21 for all regulated NSR pollutants pursuant to delegation agreements. Thus, all PSD deficiencies are adequately addressed by the incorporation of the Federal PSD program regulations into both agencies' respective portions of the Arizona SIP. 40 CFR 52.144.
ADEQ's PSD program covers all regulated NSR pollutants except GHGs. 80 FR67319 (November 2, 2015). ADEQ's PSD program identifies PM2.5 and its precursors (NOx and SO2) as regulated NSR pollutants. We are proposing to approve Arizona's 2013 NO2 and SO2 I-SIP submittals for areas under ADEQ jurisdiction with respect to regulation of PM2.5 (including condensable PM) and its precursors on this basis. As part of its Arizona NSR Submittals, ADEQ clarified that they also have jurisdiction over Pinal County's PSD program for all regulated NSR pollutants except GHGs. ADEQ has delegated implementation of the major source program to the Pinal County Air Quality Control District. 80 CFR 14044, 14045. Accordingly, we are also proposing to approve Arizona's 2013 NO2 and SO2 I-SIPs as to Pinal County with respect to regulation of PM2.5 (including condensable PM) and its precursors.
We reiterate that in our November 2, 2015 Arizona NSR Final Rule, EPA finalized a limited approval and limited disapproval of ADEQ's NSR Submittals, including the PSD portion of those submittals, based on a number of specific deficiencies EPA identified with the programs as compared with specific statutory and regulatory requirements for NSR SIP submittals.
This proposed approval of Arizona's 2013 NO2 and SO2 I-SIPs with respect to the regulation of PM2.5 (including condensable PM) and its precursors under ADEQ's PSD program evaluates basic structural components of the Arizona SIP, and is not intended to, nor should it be construed to, evaluate or address whether ADEQ's PSD program meets specific statutory and regulatory requirements for SIP-approved NSR programs.
3. Minor New Source Review
As discussed above, on November 2, 2015, EPA finalized a limited approval/limited disapproval of ADEQ's minor NSR program as part of its proposed action on ADEQ's NSR Submittals. Based on EPA's limited approval and limited disapproval of ADEQ's minor NSR program, EPA proposes to find that ADEQ's submitted minor NSR program is adequate to address the minor NSR component of an infrastructure SIP. We note that the substantive portion of ADEQ's minor NSR program rules are primarily contained in R18-2-302.01 "Source Registration Requirements" and R18-2-334 "Minor New Source Review." These and other and other administrative rules included in the minor NSR portion of the SIP submittal satisfy most of the statutory and regulatory requirements for minor NSR programs and substantially strengthen the SIP overall. 80 FR 67319.

Pima County's SIP-approved minor NSR rules are contained in Pima County rules 171, 202, 231, and 341.  See 47 FR 16328 (April 16, 1982) and 53 FR 30220 (August 10, 1988).  Maricopa County's SIP-approved minor NSR rules are contained in Maricopa County Regulation 2, rules 20 and 220, and in Regulation 1, Rule 3.  See 37 FR 15081 (July 27, 1972), 57 FR 354 (January 6, 1992), and 47 FR 15579 (April 12, 1982).  Finally, Pinal County's SIP-approved minor NSR rules are contained in Pinal County rules 3-1-040, 1-3-140, 3-1-060.2.d, and 3-1-070.A.1.  See 65 FR 79742 (December 20, 2000) and 67 FR 68764 (November 13, 2002).  The State and EPA have relied on these approved minor NSR program to assure that new and modified sources not captured by the major NSR permitting programs do not interfere with attainment and maintenance of the NAAQS.

In this action, EPA is proposing to approve Arizona's 2013 NO2 and SO2 I-SIPs with respect to the general requirement in section 110(a)(2)(C) that Arizona's SIP include a program that regulates the modification and construction of stationary sources.

We note that for purposes of this I-SIP action, EPA is not closely reviewing, or proposing to approve or disapprove, the State and county minor NSR programs based on an analysis of whether they fully satisfy EPA's regulations governing SIP-approved minor NSR programs. In addition, the counties may have minor NSR provisions that are contrary to current EPA regulations for this program. We note that because the three county (Pima, Pinal, and Maricopa) minor NSR programs were approved into the Arizona SIP many years ago, they contain outdated provisions and appear to have been superseded by new or revised regulations in some respects.  We strongly encourage all three county permitting agencies to submit current permitting regulations to replace these outdated minor NSR SIP provisions as soon as possible.

With respect to ADEQ, EPA has identified a number of specific deficiencies with respect to ADEQ's minor NSR program as compared with Clean Air Act requirements for SIP-approved minor NSR programs, which are described in EPA's limited approval/limited disapproval action on ADEQ's NSR SIP Submittals, where EPA generally finalized a limited approval and limited disapproval of ADEQ's minor NSR SIP submittal on this basis. This proposed approval of Arizona's 2013 NO2 and SO2 I-SIPs with respect to the minor NSR program addresses whether ADEQ has a basic program in the SIP to regulate the construction and modification of stationary sources, and is not intended to, nor should it be construed to, evaluate or address whether ADEQ's PSD program meets specific statutory and regulatory requirements for SIP-approved NSR programs.

Conclusion as to 110(a)(2)(C)
With respect to the requirement in section 110(a)(2)(C) to include a program to provide for the enforcement of control measures, EPA is proposing to find that the 2013 NO2 and SO2 I-SIP submittals for the 2010 SO2 and 2010 NO2 NAAQS provide an adequate infrastructure for SIP enforcement statewide, based on our conclusions about the State's general enforcement authorities.

With respect to the requirement in section 110(a)(2)(C) to include a program to provide for regulation of the modification and construction of stationary sources, including a PSD program under part C of title I, EPA is proposing to find that: (1) the SIP-approved PSD programs lack the "structural" PSD program elements identified above for the 2010 NO2 and 2010 SO2 NAAQS, and (2) that Maricopa and Pima counties do not have SIP-approved PSD programs necessary for the 2010 NO2 and 2010 SO2 NAAQS. We note that although the SIP remains deficient with respect to PSD requirements for ADEQ, Pinal, Maricopa, and Pima counties, no further action is necessary for these purposes because the Federal PSD program at 40 CFR 52.21 addresses the deficiencies in all four areas.

Element D  -  Interstate Transport [CAA § 110(a)(2)(D)]
Section 110(a)(2)(D) of the Act requires that each SIP "contain adequate provisions --
(i) prohibiting, consistent with the provisions of this title, any source or other type of emissions activity within the State from emitting any air pollutant in amounts which will -- (I) contribute significantly to nonattainment in, or interfere with maintenance by, any other State with respect to any such national primary or secondary ambient air quality standard, or (II) interfere with measures required to be included in the applicable implementation plan for any other State under part C to prevent significant deterioration of air quality or to protect visibility, and
(ii) insuring compliance with the applicable requirements of sections 126 and 115 (relating to interstate and international pollution abatement)."

Section 126(a) of the Act requires notification to affected, nearby states of major proposed new or modified sources.  Sections 126(b) and (c) pertain to petitions by affected states to EPA regarding sources violating the "interstate transport" provisions of CAA section 110(a)(2)(i).  Section 115 of the Act similarly pertains to international transport of air pollution.

Arizona's Response to This Requirement for the 2010 NO2 and SO2 NAAQS
Arizona's 2015 submittal replaced Element D as originally submitted on January 18, 2013 to address NO2 transport. This submittal asserts a negative declaration of significant contribution of interstate transport to surrounding nonattainment or maintenance areas. It draws on data from EPA's 2013 NO2 design value report that shows 1-hour and annual values below the NAAQS and no violations of the standards since 2011. They also state that 2013 NO2 levels were below the standard for surrounding states and that it is reasonable to conclude that if there are no violating monitors in Arizona, or surrounding states, that there are no significant transport impacts from Arizona to those states.

The 2015 submittal also provides details about Arizona's NO2 monitoring network, including near-roadway, Photochemical Assessment Monitoring State (PAMS), and special purpose monitoring sites. Arizona has taken steps to comply with the new near-roadway monitoring network deadlines set at 78 Fed. Reg. 16184 (March 14, 2013), by activating monitors in Maricopa County.

NOx source control measures, including federal, statewide, and Maricopa County specific rules are summarized in Appendix B, "2011 NOx Emissions and Non-Exhaustive List of Source Controls," of the submittal. This appendix shows that the largest sources of NOx are subject to control measures throughout the state. This is significant because the majority of NO2 emissions are not directly emitted, but formed in the atmosphere by NOx emissions.

ADEQ's SIP approved PSD program requires any major source that could impact an attainment or unclassifiable area and cause it to exceed the NAAQS, be subject to specific permitting and control requirements. ADEQ's PSD program applies to state areas where ADEQ has jurisdiction, including Pinal County. Maricopa and Pima Counties are not subject to ADEQ's jurisdiction and do not have SIP-approved PSD programs, but instead implement the Federal PSD program through a FIP. As explained in Element C, EPA recently approved a partial approval and partial disapproval for ADEQ's NSR SIP. ADEQ continues to work with EPA to strengthen their NSR program. ADEQ plans changes in 2016 that will bring ADEQ and Pinal County into compliance for 110(a)(2)(D)(i)(II) as well as 110(a)(2)(C) and 110(a)(2)(D)(ii), but acknowledges that the NSR/PSD program continues to be deficient in this area. They also summarize the efforts of MCAQD and PDEQ to revise their PSD programs to be approvable as part of the Arizona state SIP.

For addressing visibility impairment in Class 1 areas caused by NOx, SOx, and PM emissions, Arizona highlights their Regional Haze SIP which is a combination of requirements found in the state SIP, Federal Implementation Plans, and planned SIP revisions that encompass the Arizona strategy for achieving its 2018 Reasonable Further Progress Goals under EPA's 1999 Regional Haze Rule. Arizona has several NOx emitting sources subject to BART that are detailed in Appendix A, "Regional Haze Plan Controls and Cost Effectiveness."

Arizona states that the requirements of CAA 115 do not apply to Arizona because there are no pending claims that emissions from the state are endangering the public health or welfare of another country.

For compliance with 126(a), notification to nearby states of major proposed new or modified sources, Arizona cites the SIP approved rules at R18-2-402 "General," which requires ADEQ to send public notices of new or modified sources to the EPA Administrator and "the officials and agencies having cognizance over the location where the proposed major source or major alteration would occur." ADEQ also cites the recent July 14, 2015 action for Arizona's Ozone and Pb infrastructure SIPs where EPA found that areas under ADEQ's jurisdiction, including Pinal County, meet the requirements of 126(a). Maricopa and Pima Counties do not have SIP-approved PSD programs and are covered by a PSD FIP.

Arizona also states that CAA sections 126(b) and 126(c), which pertain to claims or petitions from nearby affected states regarding transport of emissions, do not apply because there are no petitions from other states against Arizona.

EPA Evaluation
 CAA § 110(a)(2)(D)(i) -- Prohibiting Significant Contribution to Nonattainment or Interfering with Maintenance (a.k.a., prongs 1 and 2)
First, we clarify that EPA is taking no action at this time on the effects of SO2 transport for significant contribution to maintenance or nonattainment. The discussion that follows addresses only NO2 transport. EPA will take a separate action on prongs 1 and 2 for SO2 transport at a later date.

Based on the most recent design value report for NO2 all network monitors throughout the state show annual and 1-hour levels below the 2010 standard. Historically, some monitor sites have exceeded the NAAQS, but there have been no exceedances since 2011.

No area has been designated nonattainment for the 2010 NO2 NAAQS (100 ppb 1-hour average), but this standard is intended to show local effects from roadway sources of NO2, which typically decrease to ambient concentrations within a few hundred meters downwind of roadways. Arizona is in the process of establishing a near-roadway monitoring network as required by EPA. If any violations are found of the 1-hour standard through the near-roadway network, Arizona has a mobile source control program and can address the need for any additional mobile source controls through the SIP process.

2.  CAA § 110(a)(2)(D)(i) -- Interference with Measures Preventing Significant Deterioration (a.k.a. prong 3)
EPA's 2013 I-SIP guidance clarified that one method to meet the requirements of CAA §110(a)(2)(D)(i)(II)  "is through an air agency's confirmation in its infrastructure SIP submission that new major sources and major modifications are subject to a comprehensive EPA-approved PSD permitting program in the SIP that applies to all regulated NSR pollutants and satisfies the requirements of the EPA's PSD implementation rules(s), as discussed above for purposes of Element C." Therefore, EPA's evaluation of the Arizona SIP for purposes of the 2010 NO2 and SO2 NAAQS is contained in our evaluation of PSD SIP requirements under CAA section 110(a)(2)(C), above.

 CAA § 110(a)(2)(D)(i) -- Interfering with Measures to Protect Interstate Visibility (a.k.a. prong 4)
EPA's 2013 I-SIP guidance clarifies that a state can rely upon a fully EPA-approved Regional Haze SIP to satisfy the requirements of this sub-element. Arizona's Regional Haze SIP is not fully approved by EPA. Instead it relies on regulations imposed by a FIP to address visibility impairment in Class 1 Areas caused by NOx, SOx, and PM. These regulations include control technologies or emission limits on the following facilities: Arizona Public Service Cholla,  Salt River Project Coronado Generating Station, Freeport McMoran Miami Smelter, ASARCO Hayden Smelter, Sundt Station Unit 4, and Nelson Lime Plant Kilns 1 and 2. Emissions limits and control technology requirements have been implemented through the state SIP, or initially through a FIP, but then incorporated into the SIP, at AEPCO Apache Station Units 1, 2, and 3.

Because Arizona relies on a FIP to control sources under the Regional Haze Rule, they do not meet the requirements of this portion of Element D for NO2 and SO2. However, because a FIP is already in place, no additional FIP obligation is triggered by our proposed disapproval of this portion of Arizona's infrastructure SIP, if finalized. EPA will continue to work with Arizona to incorporate FIP emission limits and control technologies into the state SIP.

4.  110(a)(2)(D)(ii) -- Interstate pollution abatement (CAA §126)
With respect to the requirement in CAA section 110(a)(2)(D)(ii) regarding compliance with the applicable requirements of section 126 relating to interstate pollution abatement, we note that the requirements of section 126(b) and (c), which pertain to petitions by affected states to EPA regarding sources violating the "interstate transport" provisions of CAA section 110(a)(2)(D)(i), do not apply to our action because there are no such pending petitions relating to Arizona.  We thus evaluate the 2013 NO2 and SO2 I-SIPs for purposes of compliance with only section 126(a).

EPA is proposing to find that Arizona should be partially approved and partially disapproved for  purposes of meeting the requirements of CAA section 126(a) regarding notification to affected, nearby states of major proposed new or modified sources for the 2010 NO2 and SO2 NAAQS. ADEQ's SIP-approved PSD rules at section R18-2-402 require the permitting agency to send a copy of the required public notice to the Administrator and to "the officials and agencies having cognizance over the location where the proposed major source or major alteration would occur."  R18-2-402, section I. EPA approved R18-2-402 "General" into the Arizona SIP as part of its November 2, 2015 action on Arizona's NSR Submittals. These requirements for notice to nearby states are consistent with EPA's requirements for PSD programs in 40 CFR 51.166(q)(2)(iv). As noted in the PSD portion of our analysis on the requirements of 110(a)(2)(C), ADEQ has recently clarified that it has authority over Pinal County's PSD program. However, as noted in EPA's 2013 I-SIP guidance, the notification requirements of CAA section 126(a)(1) apply to potential impacts from all PSD-regulated pollutants, including GHGs, not just the new or revised NAAQS for which the submissions were made. Because ADEQ's SIP approved PSD program does not cover GHGs, we are partially disapproving and partially approving ADEQ and Pinal County for the interstate pollution abatement requirements of CAA section 126(a)(1) for the 2010 SO2 and 2010 NO2 NAAQS. These deficiencies are, however, adequately addressed for ADEQ and Pinal County by the Federal PSD program in 40 CFR 52.21 and no further action is required.

Maricopa County and Pima County do not have SIP-approved PSD programs. Thus, the Arizona SIP remains deficient with respect to the PSD requirements in part C, title I of the Act and with respect to the requirement in CAA section 126(a) regarding notification to affected, nearby states of major proposed new or modified sources in these two areas. These deficiencies are, however, adequately addressed with respect to all regulated NSR pollutants in both areas by the Federal PSD program in 40 CFR 52.21 and no further action is required.

For these reasons, we find that the 2013 NO2 and SO2 I-SIPs for ADEQ and Pinal County only partially meet the requirement in CAA section 110(a)(2)(D)(ii) regarding compliance with the applicable requirements of sections 126 relating to interstate pollution abatement. We also find that Maricopa County and Pima County do not meet any of the requirements of CAA section 126 relating to interstate pollution abatement. Because these deficiencies are addressed by the Federal PSD program, our final action does not create any new FIP obligations.

5.  110(a)(2)(D)(ii) -- International Air Pollution (CAA § 115)
CAA section 115 authorizes the Administrator to require a state to revise its SIP, in the case of a belief or allegation that any air pollutant emitted in the United States causes or contributes to air pollution which may reasonably be anticipated to endanger public health or welfare in a foreign country. Because there are no such pending actions pursuant to CAA section 115, EPA has no reason to approve or disapprove any existing state rules with regard to CAA section 115. EPA thus concludes that the existing SIP is sufficient to satisfy the requirement in CAA section 110(a)(2)(D)(ii) regarding compliance with the applicable requirements of section 115.

Conclusion as to CAA 110(a)(2)(D)
With respect to the first two "prongs" of CAA section 110(a)(D)(i) (regarding significant contribution to nonattainment or interference with maintenance in any other State), we are proposing to find that Arizona meets the requirements for the 2010 NO2 NAAQS for the reasons stated above. We are not making any determination today on the first two prongs for the 2010 SO2 NAAQS. With respect to the third prong, EPA is proposing to find that Arizona does not meet the requirements for the 2010 NO2 and SO2 NAAQS for the reasons discussed above regarding PSD requirements under section 110(a)(2)(C). With respect to the fourth prong, EPA is proposing to find that Arizona does not meet the requirements for the 2010 NO2 and the SO2 NAAQS. These findings do not set up any new FIP obligations.

Finally, with respect to the requirements of CAA section 110(a)(2)(D)(ii), EPA is proposing to find that Arizona's I-SIP submittals for the 2010 NO2 and SO2 NAAQS meet the requirement, with respect to ADEQ and Pinal County. Both jurisdictions implement SIP-approved PSD programs that contain the required notice provisions. EPA is proposing to find that Maricopa County and Pima County do not meet the requirements. These jurisdictions do not have SIP approved PSD programs but are subject to the Federal PSD program in 40 CFR part 52.21. Finally, we propose to find that Arizona has adequate authority to revise the SIP to address international air pollution for both NO2 and SO2, should EPA make a formal request on that matter under CAA §115.

Element E  -  Adequate Resources and Authority, Conflict of Interest, and Oversight of Local Governments and Regional Agencies [CAA § 110(a)(2)(E)]
Section 110(a)(2)(E) requires SIPs to "provide (i) necessary assurances that the State (or, except where the Administrator deems inappropriate, the general purpose local government or governments, or a regional agency designated by the State or general purpose local governments for such purpose) will have adequate personnel, funding, and authority under State (and, as appropriate, local) law to carry out such implementation plan (and is not prohibited by any provision of Federal or State law from carrying out such implementation plan or portion thereof), (ii) requirements that the State comply with the requirements respecting State boards under section 128, and (iii) necessary assurances that, where the State has relied on a local or regional government, agency, or instrumentality for the implementation of any plan provision, the State has responsibility for ensuring adequate implementation of such plan provision."

Section 128 requires SIPs to contain requirements that (1) any board or body which approves permits or enforcement orders under the CAA shall have at least a majority of members who represent the public interest and do not derive any significant portion of their income from persons subject to permits or enforcement orders under the CAA, and (2) any potential conflicts of interest by members of such board or body or the head of an executive agency with similar powers be adequately disclosed.

Related EPA Regulations
Subpart L ("Legal Authority") of 40 CFR Part 51 specifies SIP requirements related to CAA section 110(a)(2)(E)(i) and (iii). Subpart L includes three rules: 40 CFR 51.230 ("Requirements for all plans"), 51.231 ("Identification of legal authority"), and 51.232 ("Assignment of legal authority to local agencies").

Section 51.280 ("Resources") of Subpart O ("Miscellaneous Plan Content Requirements") also relates to CAA section 110(a)(2)(E)(i) and it specifies that, with respect to resources, a SIP must include a description of the resources available to the State and local agencies at the date of submission of the plan and of any additional resources needed to carry out the plan during the five-year period following its submission. The description must include projections of the extent to which resources will be acquired at 1-, 3-, and 5-year intervals.

Section 51.240 ("General Plan Requirements") states that "Each State implementation plan must identify organizations, by official title that will participate in developing, implementing, and enforcing the plan and the responsibilities of such organizations. The plan shall include any related agreements or memoranda of understanding among the organizations."

Arizona's Response to This Requirement for the 2010 NO2 and SO2 NAAQS
Element E is not pollutant specific. Arizona's 2013 NO2 and SO2 submissions mirror each other, so their responses and EPA's evaluation are summarized together for both pollutants.

Section 110(a)(2)(E)(i)
ADEQ cites many rules in the Arizona applicable SIP that cover personnel, funding, and authority to support SIP requirements; CAA §128 requirements; and state responsibility for implementing the SIP, which includes:
 ARS §49-103 -- "Department employees, legal counsel, the director "shall employ, determine the conditions of employment and specify the duties of administrative, secretarial and clerical employees as he deems necessary."
 ARS §49-103(B) -- "The attorney general shall be the legal advisor of the department and shall give legal services as the department requires . . . The attorney general shall prosecute and defend in the name of the state all actions necessary to carry out the provisions" of Title 49, relating to the environment.
 ARS §49-455 (A) and (B)(2) -- Permit Administration Fund
 ARS §49-544 -- Emissions Inspection Fund
 ARS §49-551 -- Air Quality Fund
 ARS §49-107 -- Local Delegation of State Authority (for Maricopa, Pima, and Pinal Counties)
 ARS §49-107(B) -- Local delegation of state authority. "Monies appropriated or otherwise made available to the department for distribution to local agencies may be allocated or reallocated in a manner designed to assure that the recognized local activities and delegated functions, powers and duties are accomplished according to the applicable standards of performance."
 ARS §49-112 -- County Regulation; Standards. "A county may adopt rules that are as stringent as state rules and may administer permits provided that the costs of obtaining permits or approvals under title 49 or any rule adopted pursuant to title 49, which relates to the environment. . ."

In addition, ADEQ, Maricopa County, and Pima County all receive CAA §105 grants from EPA that offset the costs of implementing an air quality program. Certain county programs are also funded by ADEQ through contractual agreements, while others are funded through fee programs and other sources.

ADEQ also states that they, MCAQD, and PDEQ have been administering, implementing, and enforcing air programs designed to meet the CAA's SIP requirements for over 40 years and the funding and personnel described above for each of the three agencies is adequate to meet the needs of the programs. Over the next five years, current funding and personnel levels are expected to remain stable via the funding mechanisms described above and to be sufficient to meet the resource needs of the agencies for air pollution control purposes over that period.

Section 110(a)(2)(E)(ii)
Any board which approves enforcement orders or permits represents the public interest and conflict of interest is adequately disclosed through: ARS Title 38, Chapter 3, Article 8, Conflict of Interest of Officers and Employees. EPA previously identified conflict of interest deficiencies in Maricopa, Pima and Pinal.

These deficiencies were corrected when they were incorporated into the state SIP through the final action on the I-SIPS for the 2008 Pb and O3 NAAQS through the following county rules:
 Maricopa County: Rule 100
 Pima County: Rules 17.04.190, 17.12.040, 17.24.040
 Pinal County: Rule 1-3-140

Permit approval and enforcement orders are provided by the ADEQ Director and county control officers. Arizona law, which is applicable to "all public officers and employees of incorporated cities or towns, of political subdivisions and of the state and any of its departments, commissions, agencies, bodies or boards," contains provisions for adequate disclosure of any conflict of interest.

Section 110(a)(2)(E)(iii)
The purpose of 110(a)(2)(E)(iii) is to provide necessary assurances that where the State has relied on a local or regional government agency, or instrumentality for implementation of any plan provision the state has responsibility for ensuring adequate implementation of such plan provision. The following Arizona Revised Statutes grant ADEQ primary regulatory authority for air pollution control and abatement in Arizona as well as responsibility for ensuring adequate implementation of SIP provisions:
 49-107. Local delegation of state authority
 49-402(A)(1) through (A)(7), (B), and (C). State and county control
 49-404. State implementation plan
 49-406(C), (D), (E), (I), (J), (K). Nonattainment area plan
EPA Evaluation
110(a)(2)(E)(i) - Legal Authority
Several Arizona statutes in title 49 establish ADEQ's and the three counties' authorities to provide for enforcement of air pollution control measures.  For example, ARS 49-402 ("State and county control") contains general provisions regarding the respective jurisdictions of ADEQ and the counties to issue and enforce permits, among other authorities.  ARS 49-404(A) ("State implementation plan") requires the director of ADEQ to maintain a SIP that "provides for implementation, maintenance and enforcement of national ambient air quality standards and protection of visibility as required by the clean air act."  ARS 49-406 ("Nonattainment area plan") establishes a process for the designation of responsibilities among State, regional, and local agencies to develop, implement, and enforce SIPs for certain nonattainment or maintenance areas (ARS 49-406(A) through (D)), and requires each agency that commits to implement a SIP provision to describe its commitment in a resolution, which must specify, among other things, the agency's legal authority for implementing the limitation or measure and "a program for the enforcement of the limitation or measure" (ARS 49-406(G)).  EPA approved ARS 49-402, 49-404, and 49-406 into the Arizona SIP on June 8, 2000.  65 FR 36353, 36358. ARS 49-479 authorizes the board of supervisors for each county to adopt rules as it determines are necessary to control air pollution, which rules shall contain standards at "least equal to or more restrictive than those adopted by the director." EPA approved ARS 49-479 into the Arizona SIP on November 5, 2012. 77 FR 66398, 66404.

In addition, ARS 49-422(A) ("Powers and Duties") authorizes ADEQ to require sources of air contaminants to "monitor, sample or perform other studies to quantify emissions of air contaminants or levels of air pollution that may reasonably be attributable to that source" for purposes of determining whether the source is in violation of a control requirement or permit condition, among other things.  ARS 49-476.01 contains similar authorities for Pima, Maricopa, and Pinal counties. EPA approved these provisions into the Arizona SIP on November 5, 2012. 77 FR 66398, 66404.

Finally, ARS 49-460 through 49-463 broadly authorize ADEQ to request compliance-related information from sources, to issue orders of abatement upon reasonable cause to believe a source has violated or is violating an air pollution control requirement, to establish injunctive relief, to establish civil penalties of up to $10,000 per day per violation, and to conduct criminal enforcement, as appropriate through the Attorney General.  ARS 49-510 through 49-513 contain similar authorities for Pima, Maricopa, and Pinal counties.  EPA approved these provisions into the Arizona SIP on November 5, 2012. 77 FR 66398, 66404. We note that approval of these State and local enforcement authorities into the Arizona SIP would have no effect on EPA's independent authorities under sections 113 and 114 of the Act.

None of the statutory provisions discussed above are limited to specific pollutants and thus would apply for the purposes of the 2010 NO2 and SO2s standard. We propose to find that the applicable Arizona SIP provides for the necessary legal authority to carry out the SIP and thereby meets the related requirements under CAA section 110(a)(2)(E)(i) and 40 CFR 51.230 through 40 CFR 51.232.

110(a)(2)(E)(i) - Personnel and Funding
In its 2013 NO2 and SO2 I-SIP Submittals, ADEQ provided a narrative outlining the resources available to the state and counties to carry out the SIP. EPA is not taking action to approve all of these provisions into the SIP but is merely referencing them here to show that Arizona and the relevant counties have adequate resources to implement the SIP:

In the State of Arizona, ADEQ is the primary organization responsible for developing, implementing, and enforcing the SIP.

Under ARS § 49-103 "Department employees; legal counsel" the director, "shall employ, determine the conditions of employment and specify the duties of administrative, secretarial and clerical employees as he deems necessary." Under § 49-103(B) "The attorney general shall be the legal advisor of the department and shall give legal services as the department requires ... The attorney general shall prosecute and defend in the name of this state all actions necessary to carry out the provisions" of Title 49, relating to the environment.

Funding to staff to administer the Arizona air quality control programs consists of fees that are collected from regulated emissions sources, including fees collected to administer permitting programs. Under ARS § 49-455 "Permit administration fund", a permit administration fund is established consisting of fees and interest collected pursuant to article 2 governing state air pollution control. Under the statute, the director shall administer the fund subject to annual legislative appropriation. On notice from the director, the state treasurer shall invest and divest monies in the fund as provided in ARS § 35-313, and monies earned from investment shall be credited to the fund.

There is also an emissions inspection fund that consists of monies appropriated to the fund by the legislature; monies collected pursuant to ARS § 49-543(A) concerning vehicle emissions inspections; monies collected by the director for the issuance of inspection certificates to owners of fleet emissions inspection stations; monies received from private grants or donations when so designated by the grantor or donor; and monies received from the United States by grant or otherwise to assist the state in any emissions inspection program. See ARS § 49-544.

A third source of funding in Arizona is the Air Quality Fund. Under ARS § 49-551 "Air quality fee; air quality fund; purpose" every person who is required to register a motor vehicle in the state pursuant to ARS § 28-2153 shall pay, in addition to the registration fee, an annual air quality fee at the time of vehicle registration. Interest earned on monies in the fund shall be credited to the fund. Monies in the air quality fund shall be used, subject to legislative appropriation, for air quality research and programs for the purpose of bringing area A or area B into or maintaining attainment status, improving air quality in areas outside area A and B, and reducing emissions of various pollutants including particulate matter, carbon monoxide, oxides of nitrogen, volatile organic compounds and hazardous air pollutants throughout the state. The funds are also used to monitor visible air pollution and reduce emissions of pollutants that contribute to visible air pollution in counties with a population of four hundred thousand persons or more. See §49-551(C)(1).

A final source of funding for ADEQ's air programs is CAA section 105 ("Grants for support of air pollution planning and control programs") under which EPA is authorized to make grants to air pollution control agencies to defray a portion of the costs associated with implementation of programs for the prevention and control of air pollution and achievement of the national ambient air quality standards. To qualify for such grants in a given year, air pollution control agencies must at least maintain the same level of funding from non-Federal funds for air pollution control programs as for the preceding year. See CAA section 105(c).

Counties
For Maricopa, Pima, and Pinal Counties, ARS § 49-107 "Local delegation of state authority" the director "may delegate to a local environmental agency, county health department, public health services district or municipality any functions, powers or duties which the director believes can be competently, efficiently and properly performed by the local agency if the local agency accepts the delegation and agrees to perform the delegated functions, powers and duties according to the standards of performance required by law and prescribed by the director." Under § 49-107(B), "Monies appropriated or otherwise made available to the department for distribution to local agencies may be allocated or reallocated in a manner designed to assure that the recognized local activities and the delegated functions, powers and duties are accomplished according to the applicable standards of performance." In addition, EPA funds air programs for Maricopa and Pima Counties through the CAA §105 funding mechanism described above. These delegation and funding mechanisms help ensure that the counties will have adequate personnel and funding to implement the delegated portions of the SIP.

The scope of county SIP authority is as follows: under ARS § 49-112 "County regulation; standards", a county may adopt rules that are as stringent as state rules and may administer permits provided that the cost of obtaining permits will be approximately equal or be less than the fee or cost of obtaining similar permits or approvals under title 49 or any rule adopted pursuant to title 49, which relates to the environment. The county no-drive days and travel reduction programs are funded by contractual agreements with ADEQ. Other county air quality programs are funded by county fee programs and other sources. In Arizona, the Metropolitan Planning Organizations (MPOs) certified to do planning (Maricopa and Pima) do so for ozone, carbon monoxide, or particulate nonattainment or maintenance areas. See § 49-406(C). The MPOs receive funding as directed in ARS § 49-406(A). Under ARS § 49-402(B) Maricopa County Air Quality Control District (MCAQCD) and the Pima Department of Environmental Quality (PDEQ) each have a "control officer" whose powers to permit and enforce are set forth under the statute. ADEQ's contractor operates the Vehicle Emissions Inspection program in both Area A and in Area B. The issuance and administration of permits at the county level is outlined in ARS §§ 49-480, 49-480.01, and 49-480.02.

Under ARS § 49-476 "[t]he department of environmental quality, county health departments, or boards of supervisors may accept and expend in accordance with the terms of the grant any funds granted to it for research of air pollution by the federal government, any political subdivision of the state, any agency or branch of the federal or state governments, or any private agency."
ADEQ, MCAQCD, and PDEQ have been administering, implementing, and enforcing air programs designed to meet the CAA's SIP requirements for over 40 years, and the funding and personnel described above for each of the three agencies is adequate to meet the needs of these programs.

According to their NO2 and SO2 I-SIP Submittals, over the next five years, current funding and personnel levels are expected to remain stable via the funding mechanisms described above and to be sufficient to meet the resource needs of the agencies for air pollution control purposes over that period.

110(a)(2)(E)(ii) State Boards and Conflicts of Interest
CAA section 110(a)(2)(E)(ii) refers to the requirements of CAA section 128, which addresses potential conflicts of interest concerning final decisions by boards or the heads of executive agencies on permits and enforcement orders issued under air pollution control programs developed to meet CAA requirements. Arizona's 2009 and 2012 submittals for the 1997 ozone, 1997 PM2.5, and 2006 PM2.5 NAAQS provided an analysis and a number of state statutes regarding how the state addresses conflict of interest, as per the requirements of CAA section 128. As part of our rulemaking on the state's infrastructure SIP submittals for the 1997 ozone, 1997 PM2.5, and 2006 PM2.5 NAAQS, we included our evaluation of the state's provisions for conflict of interest (2012 Section 128 TSD) and concluded that they mostly meet the requirements of CAA sections 110(a)(2)(E)(ii) and 128 for all four jurisdictions in the state (i.e., the state level, Pima County, Pinal County, and Maricopa County). That rulemaking approved a number of state statues into the Arizona SIP, where they remain.

The 2012 action also outlined very narrow deficiencies within the Maricopa, Pima, and Pinal county programs concerning the section 128(a)(1) requirements for any board or body which approves enforcement orders. Specifically, EPA noted that ARS 49-478 in conjunction with the definitions of "substantial interest" and "remote interest" in ARS 38-502 satisfy the "public interest" and "significant income" requirements of CAA section 128(a)(1) for Maricopa, Pima, and Pinal counties, but only with respect to interests in persons subject to permits. EPA specifically cited the conflict of interest provisions in Pima County Rule 17.04.190, applicable to the Pima County Air Quality Hearing Board, as satisfying the section 128(a)(1) requirements; however, that regulation had not been submitted for inclusion in the SIP. Our disapproval of this portion of Arizona's I-SIP for Pima, Maricopa, and Pinal counties triggered a FIP clock under CAA section 110(c)(1), which requires EPA to promulgate a FIP if we do not approve provisions into the SIP addressing this deficiency within two years from the date of disapproval.

On December 19, 2013, EPA received the 2013 Pima County submittal from Eric Massey, Director of ADEQ. This submittal included Pima County Rule 17.04.190 "Composition," adopted September 28, 1993 for inclusion into the Arizona SIP as well as a completeness checklist, copies of authorizing statutes, and copies of public process documentation. Pima County Rule 17.04.190 was submitted to address the deficiency in section 110(a)(2)(E)(ii) of the SIP for Pima County concerning conflict of interest requirements for hearing boards.

On December 6, 2013, EPA received the 2013 Maricopa County submittal from Eric Massey, Director of ADEQ. Maricopa County Rule 100 was submitted to address the deficiency in section 110(a)(2)(E)(ii) of the SIP for Maricopa County concerning conflict of interest requirements for hearing boards and also included a completeness checklist, copies of authorizing statutes, and copies of public process documentation.

On September 4, 2014, EPA received the 2014 Pinal County submittal from Eric Massey, Director of ADEQ. This submittal included Pinal County Rule 1-3-140 "Definitions," adopted July 23, 2014 for inclusion into the Arizona SIP. Rule 1-3-140 was submitted to address the deficiency in section 110(a)(2)(E)(ii) of the SIP for Pinal County concerning conflict of interest requirements for hearing boards and also included a completeness checklist, copies of authorizing statutes, and copies of public process documentation.

EPA approved Pima County Rule 17.04.190, Maricopa County Rule 100, and Pinal County rule 1-3-140 (74) as part of the August 10, 2015 action on the 2008 Pb and O3 NAAQS.

The Maricopa County, Pima County, and Pinal County submittals filled the gap created by our partial disapproval of section 110(a)(2)(E)(ii) in 2012. Consequently, as in the 2008 Pb and O3 action, we propose to find that the Maricopa, Pima and Pinal County portions of the Arizona SIP satisfy the requirements for section 128(a)(1) and 128(a)(2) as required by section 110(a)(2)(E)(ii).

110(a)(2)(E)(iii) - Necessary Assurances
110(a)(2)(E)(iii) requires states to provide "necessary assurances that, where the State has relied on a local or regional government, agency, or instrumentality for the implementation of any plan provision, the State has responsibility for ensuring adequate implementation of such plan provision."

Under ARS section 49-402, the department (ADEQ) has original jurisdiction over all major sources for new source review and prevention of significant deterioration ("PSD") under the CAA as well as mobile sources. A county or multi-county air quality control region, however, can assert jurisdiction over the aforementioned sources with ADEQ approval. Any delegation of jurisdiction can be revoked by the ADEQ director upon notification and after providing an opportunity to confer with the affected county or multi-county air quality control region.

In Arizona, counties with a certified metropolitan planning agency (MPO) carry out and implement the SIP in nonattainment and maintenance areas. See ARS 49-406(A). For any ozone, carbon monoxide or particulate nonattainment or maintenance area for which no metropolitan planning organization exists, ADEQ has primary responsibility for the development of a nonattainment or maintenance area plan for that area. See ARS 49-406(B). There are no counties in Arizona that are nonattainment for the 2010 NO2 standard so ADEQ is in charge of implementing the SIP for that pollutant statewide. For the 2010 SO2 standard there are two nonattainment areas, one in Miami, AZ and the other in Hayden, AZ. Neither nonattainment area is located in a county with a certified MPO, so ADEQ is in charge of implementing the SIP statewide for SO2 as well.

ARS 49-406 ("Nonattainment area plan") establishes a process for the designation of responsibilities among State, regional, and local agencies to develop, implement, and enforce SIPs for certain nonattainment or maintenance areas (ARS 49-406(A) through (D)), and requires each agency that commits to implement a SIP provision to describe its commitment in a resolution, which must specify, among other things, the agency's legal authority for implementing the limitation or measure and "a program for the enforcement of the limitation or measure" (ARS 49-406(G)).

ARS 49-406(I) gives the control officer the authority to issue an injunction through the county attorney if it is determined that any person has failed to implement an emission limitation or other control measure adopted pursuant to subsection G. If the control officer fails to act, the director of ADEQ, through the attorney general, has similar authority to issue an injunction or file any other action for relief provided by law. See ARS 49-406(J). EPA approved ARS 49-402, 49-404, and 49-406 into the Arizona SIP on June 8, 2000. 65 FR 36353.

In addition to these statutory references, we have previously found that Arizona law includes the necessary assurances that where a state has relied on a local or regional government, agency or instrumentality for the implementation of any plan provision, the State has responsibility for ensuring adequate implementation of such plan provision. 60 FR 18010, 18019 (April 10, 1995); 65 FR 19964, 19989 (April 13, 2000).

We propose to find that these provisions in the Arizona SIP provide "necessary assurances that, where the State has relied on a local or regional government, agency, or instrumentality for the implementation of any plan provision, the State has responsibility for ensuring adequate implementation of such plan provision."

Conclusion as to CAA 110(a)(2)(E)
Based on the above submissions from the State of Arizona we propose to find that Arizona and the relevant counties have adequate personnel, funding, and resources to carry out the SIP. We also propose to find that Arizona and the relevant counties meet the conflict of interest requirements of CAA Section 128. Finally, we propose to find that Arizona has provided necessary assurances that where the State has relied on a local agency for the implementation of any plan provision, the State has responsibility for ensuring adequate implementation of such plan provision.

Element F  -  Stationary Source Monitoring and Reporting [CAA § 110(a)(2)(F)]
Section 110(a)(2)(F) requires, "as may be prescribed by the Administrator --  (i) the installation, maintenance, and replacement of equipment, and the implementation of other necessary steps, by owners or operators of stationary sources to monitor emissions from such sources, (ii) periodic reports on the nature and amounts of emissions and emissions-related data from such sources, and (iii) correlation of such reports by the State agency with any emission limitations or standards established pursuant to this Act, which reports shall be available at reasonable times for public inspection."

This Element is not pollutant specific and ADEQ's NO2 and SO2 submittals mirror each other for this I-SIP requirement so we will summarize Arizona's response and our evaluation together.

Related EPA Regulations
40 CFR part 51, subpart K ("Source Surveillance") relates to source monitoring, recordkeeping, and reporting requirements.

Arizona's Response to This Requirement for the 2010 NO2 and SO2 NAAQS
Arizona Revised Statutes "provide authority to require any sources of air contaminants to monitor, sample or perform other studies to quantify emissions of air contaminants or levels of air pollution that may be reasonably attributable to that source."

Arizona Revised Statutes Tile 49, Chapter 3, Article 2 provides ADEQ with the authority to adopt rules or revise operating permits to ensure any source takes reasonable steps to quantify released emissions. In order to quantify emissions coming from a source, ADEQ has the authority to require the installation, use, and maintenance of continuous emissions monitoring systems, requirements for record keeping and reporting, and requirements for violation and equipment failure notification.

The relevant ARSs identified by ADEQ are: 49-422, 49-424, ADEQ Rules RI8-2-313 "Existing Source Emission Monitoring" and RI8-2-327 "Annual Emission Inventory Questionnaire"; Maricopa Rule 100 "General Provisions and Definitions", section 500 "Monitoring and Records; and Pima County Rules 17.12.040 "Reporting Requirements" and 17.24.040 "Reporting for compliance evaluations."

EPA Evaluation
ADEQ's NO2 and SO2 I-SIP submittals list statutes and rules that provide a range of authorities and requirements for the adoption and implementation of State and local programs necessary to address CAA section 110(a)(2)(F). The relevant authorities and requirements are described in detail later in this section of the TSD. Beyond the ARSs cited by ADEQ, there are additional ADEQ, Maricopa County, Pima County, and Pinal County regulations in the SIP that further support 110(a)(2)(F). In total, these provisions establish specific requirements related to monitoring, recordkeeping, reporting, correlation, and public access to reports.

Arizona Revised Statutes (ARSs) in the SIP and supportive of (F):
      i. For ADEQ Programs:
ARS 49-422 gives the director the authority to require a source to monitor air contaminants, and requires the director to adopt rules requiring sources of air contaminants to perform monitoring.  49-476.01 authorizes the control officer to require any source of air contaminants to monitor, sample or perform other studies to quantify emissions.

ARS 49-424 requires ADEQ to compile and publish from time to time reports, data and statistics with respect to those matters studied and investigated by the department.  ARS 49-424 also requires ADEQ to conduct investigations, inspections and tests, and it requires ADEQ to compile and publish from time to time reports, data and statistics with respect to those matters studied and investigated by the department.

      ii. For County Programs:
ARS 49-476.01 authorizes the control officer to require any source of air contaminants to monitor, sample or perform other studies to quantify emissions.

ADEQ Rules in the SIP Supportive of (F):
ADEQ 18-2-313 applies to: fossil fuel-fired steam generators; fluid bed catalytic cracking unit catalyst regenerators; sulfuric acid plants; and nitric acid plants.  The rule requires that these sources install, calibrate, operate and maintain operating equipment, and it specifies minimum monitoring requirements.

ADEQ R18-2-310.01 requires the owner or operator of any source to report to the Director any emissions in excess of the limits established by applicable rule or in an applicable permit.  The report shall identity each emission point where the excess emissions occurred and the magnitude of the excess emissions including the operating data and calculations used in determining the magnitude of the excess emissions.

ADEQ R18-2-327, requires sources subject to a permit requirement to complete and submit an annual emissions inventory questionnaire.  The questionnaire includes reporting of the actual annual quantity of emissions, including documentation of the method of measurement, calculation or estimation for any single regulated air pollutant in a quantity greater than one ton or any combination of regulated air pollutants in a quantity greater than 2(1/2) tons.

Maricopa County Rules in the SIP Supportive of (F):
The following category-specific rules include requirements for monitoring and record keeping:

Rule 322 Power Plant Operations
Rule 323 Fuel Burning Equipment from Industrial/Commercial/Institutional Sources
Rule 324 Stationary Internal Combustion Engines

In addition, Maricopa Rule 100, Section 500, which was approved into the SIP on November 5, 2012 (77 FR 66405) requires that the owner and/or operator of any air pollution source maintain and furnish records of all emissions testing and monitoring, and any other records relating to the emission of air contaminants requested by the Control Officer. The owner and/or operator of a source requested to submit information rule may subsequently be required to submit annual reports if specified by the Control Officer. The owner and/or operator of any source which emits or may emit oxides of nitrogen (NOx) or volatile organic compounds (VOC) shall provide the Control Officer with an emission statement showing measured actual emissions or estimated actual emissions of NOx and VOC. If requested or directed by the Control Officer, the owner and/or operator of a business shall complete and submit an annual emissions inventory report.

Rule 140, which was approved into the SIP on August 27, 2002 (67 FR 54957), requires the owner or operator of any source shall report to the Director any emissions in excess of the limits established by applicable rule or in an applicable permit.  The report shall identity each emission point where the excess emissions occurred and the magnitude of the excess emissions including the operating data and calculations.

Pima County Rules in the SIP Supportive of (F):
EPA previously proposed approval of Arizona's I-SIP for section 110(a)(2)(F) for the 1997 ozone, 1997 PM2.5, and 2006 PM2.5 NAAQS for Pima County, pending the submittal of Pima County Rules 17.12.040 and 17.24.040. EPA proposed in the alternative to disapprove for section 110(a)(2)(F) if Pima County did not submit Rules 17.12.040 and 17.24.040.  We finalized this disapproval on October 15, 2012 after the Pima county rules were not submitted for inclusion in the SIP, which triggered a two-year FIP clock for Arizona in conjunction with Pima County to submit a SIP revision addressing this deficiency.
On December 19, 2013, EPA received the 2013 Pima County I-SIP submittal from ADEQ. This submittal included the rules identified in our 2012 proposal as satisfying the CAA section 110(a)(2)(F) requirement for stationary source monitoring: Pima County Rules 17.12.040 "Reporting for Compliance Evaluations," adopted September 28, 1993; and 17.24.040 "Reporting Requirements," adopted April 19, 2005.

Pima County Rule 17.12.040, requires the owner or operator of any source report to the Control Officer any emissions in excess of the limits established by applicable rule or in an applicable permit. The report shall identity each emission point where the excess emissions occurred, the magnitude of the excess emissions including the operating data and calculations used, the time and duration or expected duration of the excess emissions, and the nature and cause of the emissions.

Pima County Rule 17.24.040 authorizes the Control Officer to require a person produce all existing books, records, or other documents which might reasonably contain evidence needed to determine compliance or noncompliance.

Pima County Rules 17.12.040 and 17.24.040 were approved into the SIP by EPA on August 10, 2015 (80 FR 47859).

Pinal County Rules in the SIP Supportive of (F):
Pinal County 3-1-081, requires that each permit include emissions monitoring and analysis procedures or test methods required under the applicable requirements, including any procedures and methods promulgated pursuant to §114(a)(3) or 504(b) of the Clean Air Act (1990).  With respect to reporting, the permit shall incorporate all applicable reporting requirements and require submittal of reports of any required monitoring at least every 6 months. All instances of deviations from permit requirements shall be clearly identified in such reports.

Pinal County 3-1-083, requires that each permit contain monitoring requirements sufficient for compliance and all emissions monitoring and analysis procedures or test methods required under the applicable requirements, including any procedures and methods promulgated pursuant to §114(a)(3) or 504(b) of the Clean Air Act (1990).  With respect to reporting, 3-1-083 requires that permits incorporate all applicable reporting requirements and submittal of reports of any required monitoring at least every 6 months and prompt reporting of deviations from permit requirements.

Pinal County 3-1-083 also requires that permits contain requirements for compliance certification with terms and conditions contained in the permit, and the compliance certifications must be submitted no less than annually.  Permits must also include the means to monitor the compliance of the source with its emissions limitations, standards, and work practices and a requirement that the compliance certification include the following: (1) identification of each term or condition of the permit that is the basis of the certification; (2) compliance status; (3) whether compliance was continuous or intermittent; (3) method(s) used for determining the compliance status of the source, currently and over the reporting period; and (4) other facts as the Control Officer may require to determine the compliance status of the source.  The compliance certifications are submitted to the Control Officer, and for Class A permits, to EPA as well.

Pinal County, 3-1-103 requires every source subject to a permit requirement or who obtains an authorization to operate shall complete and submit an annual emissions inventory questionnaire.  The questionnaire shall include the actual annual quantity of emissions, including documentation of the method of measurement, calculation or estimation of any single regulated air pollutant in a quantity greater than one ton or any combination of regulated air pollutants in a quantity greater than 2(1/2) tons.

Pinal County 3-1-107, describes the public availability of permitting information. Pinal County 3-1-120, Confidentiality of records, clarifies records available to the public. These rules were all approved into the Arizona SIP on December 20, 2000 (65 FR 79742).

Conclusion as to CAA 110(a)(2)(F)
EPA has reviewed the requirements in CAA section 110(a)(2)(F) and compared them to the 2013 NO2 and SO2 submittals and other supporting information in the SIP. Based on this review, we propose to find that Arizona requirements adequately address CAA section 110(a)(2)(F)(i), (ii), and (iii).

Element G  -  Emergency Episodes, [CAA § 110(a)(2)(G)]
CAA § 110(a)(2)(G) requires SIPs to "provide for authority comparable to that in section 303 and adequate contingency plans to implement such authority." EPA promulgated rules for emergency episodes in 1971 and revised those rules in 1986 to clarify state requirements related to emergency episodes found in CAA § 110(a)(2)(G). These rules are found at 40 CFR 51.150 through 153, inclusive.

Arizona's Response to This Requirement for the 2010 NO2 and SO2 NAAQS
Arizona's 2010 NO2 and SO2 submissions are similar for this element, except as described below for SO2, so Arizona's responses for each pollutant are summarized together.

Arizona Revised Statutes §49-465 (approved into the SIP at 77 FR 66398; November 5, 2012) authorizes State actions to alleviate or prevent an emergency health risk to the public due to air pollution or likely exceedance of the NAAQS. The Governor "may, by proclamation, declare that an emergency exists and may prohibit, restrict, or condition" any and all activity that contributes to the emergency. Arizona Administrative Code RI8-2-220, "Air Pollution Emergency Episodes" (approved into the SIP as AAC R9-3-219 at 47 FR 42572; September 28, 1982), prescribes the procedures the ADEQ Director shall implement in order to prevent the occurrence of ambient air pollution concentrations which would cause significant harm to public health. Procedures include governmental and public notification of the nature of the episode and, at the directive of the Governor's office, possible curtailment of industrial and commercial activities.

Similar provisions for determining air pollution emergency episodes, advisory procedures, and control actions are contained in the following county codes:
 Maricopa County Air Pollution Control Regulations, Regulation VI  -  Emergency Episodes, Rule 600, Emergency Episodes;
 Pima County Municipal Code, Title 17. Air Quality Control, Chapter 17.32, Emergency Episodes and Public Awareness, Article 1. Emergency Episodes; and
 Pinal County Air Quality Control District Code of Regulations, Chapter 2. Ambient Air Quality Standards, Article 7. Air Pollution Emergency Episodes.

On October 15, 2012 EPA approved the Arizona Emergency Episode Plan into the Arizona SIP. EPA found the plan to be substantively identical to CAA section 110(a)(2)(G). The rulemaking included the rule currently approved into Arizona's SIP (R9-3-219 "Air pollution emergency episodes"), which EPA approved in 1982 (47 FR 42572, September 28, 1982), and revisions submitted on August 15, 1994. These revisions included: 1) Rule 18-2-220, "Air pollution emergency episodes", amended effective September 26, 1990, 2) a letter from Eric C. Massey, Director of Air Quality, Arizona, and ADEQ, to Jared Blumenfeld, Regional Administrator, US EPA dated August 30, 2012, certifying that the attached copy of a document titled "Procedures for Prevention of Emergency Episodes: 1988 Edition" is a true and correct copy of the original and is an official publication of ADEQ and 3) the document titled "Procedures for Prevention of Emergency Episodes," 1988 Edition, ADEQ.

In addition to what is summarized above, the SO2 submittal states, "The significant harm level for SO2 at 40 CFR 51.151 is unchanged and ADEQ's emergency episode rules and procedures approved into the SIP on October 15, 2012, meet the minimum requirements for SO2 (77 FR 62452)."

EPA Evaluation
EPA's implementing regulations for "contingency plans" (also known as emergency episode plans) are set forth at 40 CFR §§ 51.150-153. Section 51.150 provides criteria for the classification of areas for emergency episode planning purposes, based on previously measured concentrations of ambient air pollutants, specifically sulfur oxides, particulates matter, carbon monoxide, nitrogen dioxide, and ozone. Areas, also known as Air Quality Control Regions (AQCR), are classified as Priority I, IA, II, or III, with Priority I regions being those with the highest measured ambient air levels and Priority III regions as those with the lowest. Priority I, IA, and II regions are required to develop emergency episode plans, while Priority III regions need only provide for authority comparable to that in CAA section 303.

In Arizona, all AQCRs are Priority III for NO2, meaning they need only general section 303 authority for Element G, which is already in place and discussed in EPA's October 15, 2012 Emergency Episode Plan SIP Approval for Arizona.
For SO2, the Pima Intrastate region is Priority II while the Central Arizona and Southeast Arizona Intrastate regions are Priority IA for SO2. All other areas of the state are Priority III. Thus, three AQCRs in Arizona are required to have emergency episode plans for SO2, per EPA regulations at 40 CFR 51.151 and 51.152.
We have reviewed Arizona's 2013-2015 air quality data for the Pima Interstate region to determine if it could be reclassified. The classification thresholds for SO2 are unique in that thresholds are prescribed for three different averaging periods. The thresholds and ranges for Priority II classification are as follows:
 3-hour: greater than 0.5 ppm,
 24-hour: 0.10  -  0.17 ppm, and
 Annual arithmetic mean: 0.02  -  0.04 ppm.

Areas with ambient air concentrations that are below the Priority II threshold are classified as Priority III. There is one SO2 monitor within the Pima Intrastate region, located in Tucson and operated and maintained by Pima County. The highest SO2 levels at the Tucson monitor were 1.1 ppb (.0011 ppm) for the 24-hour average and .24 ppb (.00024 ppm) for the annual arithmetic mean. Both occurred in 2013. In addition, the highest 1-hour SO2 concentration at the Tucson monitor during this period was 9.6 ppb (.0096 ppm), which occurred in 2014. Monitored levels in 2015 were even lower than the previous two years. The highest 1 hour level was 5.1 ppb (.0051 ppm) and the annual arithmetic mean was .16 ppb (.00016 ppm) While there are no 1-hour SO2 classification thresholds in 40 CFR 51.150(b), by definition these concentrations reinforce the fact that 3-hour and 24-hour levels have not exceeded the respective Priority II classification thresholds because they are lower than such thresholds.
Thus, we are proposing to find that the Pima Intrastate region meets the requirements to be reclassified from Priority II to priority III for SO2, thus relieving the AQCR of the emergency episode plan requirement. Should we finalize this reclassification, the Pima Intrastate region would no longer be required to have an emergency episode contingency plan for SO2.
We are not proposing any change in classification for the Central Arizona and SE Arizona AQCRs. These areas are classified priority 1A due to large sources of SO2 that are still operating in the Central Arizona and SE Arizona AQCRs. We agree with ADEQ that the significant harm level for SO2 at 40 CFR 51.151 is unchanged from when ADEQ's emergency episode rules and procedures were approved into the SIP on October 15, 2012. We believe that the state meets the minimum requirements for priority 1A SO2 areas and propose to find that ADEQ's Emergency Episode Plan as approved in October 15, 2012, meets the requirements of section 110(a)(2)(G) for the 2010 SO2 standard.

Conclusion as to 110(a)(2)(G)
We propose to find that Arizona's SIP meets the requirements of CAA Section 110(a)(2)(G) for both the 2010 NO2 and SO2 NAAQS. We propose to reclassify the Pima Intrastate region from Priority II to Priority III for the 2010 SO2 NAAQS.

Element H  -  SIP Revisions [CAA § 110(a)(2)(H)]
Section 110(a)(2)(H) requires SIPs to "provide for revision of such plan -- (i) from time to time as may be necessary to take account of revisions of such national primary or secondary ambient air quality standard or the availability of improved or more expeditious methods of attaining such standard, and (ii) except as provided in paragraph (3)(C), whenever the Administrator finds on the basis of information available to the Administrator that the plan is substantially inadequate to attain the national ambient air quality standard which it implements or to otherwise comply with any additional requirements established under this Act."

ADEQ's Response to This Requirement for the 2010 NO2 and SO2 NAAQS
Arizona states that their statutes contain authority to revise the Arizona SIP to comply with the requirements of the CAA including changes in the NAAQS. Under ARS §49-404, ADEQ is required to "maintain a state implementation plan that provides for implementation, maintenance and enforcement of national ambient air quality standards and protection of visibility as required by the clean air act.'" ADEQ also identified ARS §49-406 as relevant to meeting the requirements of Section 110(a)(2)(H).

EPA Evaluation
Under ARS 49-404.A. the director of ADEQ "shall maintain a state implementation plan that provides for implementation, maintenance and enforcement of national ambient air quality standards and protection of visibility as required by the clean air act." 65 FR 36353 (June 8, 2000). EPA interprets this statute as requiring the state to revise the SIP as necessary whenever a new NAAQS is promulgated and/or whenever the plan is substantially inadequate to attain the national ambient air quality standard or comply with any other requirements under the Clean Air Act.

Conclusion as to CAA 110(a)(2)(H)
For the purposes of both the 2010 NO2 and SO2 NAAQS, we propose to find that Arizona statutes provide for revision of the SIP in the following circumstances: (1) as necessary to take account of revisions of such national primary or secondary ambient air quality standard or the availability of improved or more expeditious methods of attaining such standard and, (2) whenever the Administrator finds that Arizona's plan is substantially inadequate to attain the NAAQS or does not comply with requirements established under the Act.

Element I  -  Plan Revisions for Nonattainment Areas [CAA § 110(a)(2)(I)]
CAA section 110(a)(2)(I) requires SIPs to "in the case of a plan or plan revision for an area designated as a nonattainment area, meet the applicable requirements of part D (relating to nonattainment areas)."

While this section requires States to meet nonattainment area requirements, pursuant to CAA title I, part D, when submitting plans or plan revisions for nonattainment areas, EPA has concluded that the submission of, and subsequent EPA action on, nonattainment SIP revisions by States is not governed by the three-year submission deadline identified in CAA section 110(a)(1). Instead, SIP revisions for nonattainment areas are due and evaluated under the requirements for nonattainment areas described in part D.

Arizona's Response to This Requirement for the 2010 NO2 NAAQS
Arizona refers to EPA's October 2, 2007 guidance to note that EPA does not expect infrastructure SIP submissions to include regulations or emissions limits developed specifically for attaining the NAAQS. ADEQ recognizes that the guidance was written for the 1997 PM2.5 and 8-hour ozone NAAQS, but assumes that since additional guidance was not available at the time of the development of the I-SIP, that the requirements for the 2010 NO2 NAAQS under 110(a)(2)(I) are the same.

Arizona's Response to This Requirement for the 2010 SO2 NAAQS
ADEQ states, "The specific nonattainment area plan requirements of section 110(a)(2)(I) are subject to the timing requirement of section 172, not the timing requirement of section 110(a)(1).

EPA Evaluation
As noted above, EPA agrees that the specific nonattainment area plan requirements of section 110(a)(2)(I) are subject to the timing requirement of section 172, not the timing requirement of section 110(a)(I). This position was reiterated in our 2013 Infrastructure SIP guidance. This element is therefore not applicable to this action. Any evaluations of Arizona's SIP in relation to the requirements of CAA title I, part D will be completed in relation to the relevant nonattainment area plans.

Element J  -  Consultation with Government Officials; Public Notification; and PSD and Visibility Protection [CAA § 110(a)(2)(J)]
CAA section 110(a)(2)(J) requires SIPs to "meet the applicable requirements of section 121 (relating to consultation), section 127 (relating to public notification), and part C (relating to prevention of significant deterioration of air quality and visibility protection)."

CAA section 121 requires SIPs, in carrying out the requirements under the CAA requiring SIPs to contain any transportation controls, air quality maintenance plan requirements or preconstruction review of direct sources of air pollution, or any measure referred to in part D or part C of title I, to provide a process of consultation with general purpose local governments, designated organizations of elected official of local governments and any Federal land manager having authority over Federal land to which the State plan applies. Such process shall be in accordance with regulations promulgated by EPA.

CAA section 127 requires SIPs to contain measures to effectively notify the public during any calendar year on a regular basis of instances or areas in which any NAAQS is exceeded or was exceeded during any portion of the preceding calendar year, to advise the public of the health hazards associated with such pollution, and to enhance public awareness of the measures which can be taken to prevent such standards from being exceeded and the ways in which the public can participate in regulatory and other efforts to improve air quality. Such measures may include the posting of warning signs on interstate highway access points to metropolitan areas or television, radio, or press notices or information.

For a discussion of the CAA title I, part C requirements, see our evaluation of section 110(a)(2)(C) above.

Related EPA Regulations
EPA's regulations concerning public notification are set forth in set forth in subpart O ("Miscellaneous Plan Content Requirements") of 40 CFR part 51, section 51.285 ("Public notification").

ADEQ's Response to This Requirement for 2010 NO2 and SO2 NAAQS
Consultation
Both I-SIPs state the following, "Arizona agencies maintain appropriate consultation procedures with local governments, CAA Section 174 and metropolitan planning agencies, and federal land managers regarding implementation of CAA requirements. ARS §49-406 requires the State, the metropolitan planning agency on behalf of affected local governments, county agencies, and the Department of Transportation to enter into a memorandum of agreement for the purpose of coordinating the development, implementation, and enforcement of nonattainment and maintenance plans. Additionally, opportunity for comment is provided through stakeholder meetings and public hearings held to solicit testimony from the public as well as federal and local air quality planning agencies prior to adoption of any revision to the Arizona SIP."

In addition the NO2 I-SIP cites the following statutes for ADEQ programs:
49-104(A)(2), (A)(4), (B)(3), and (B)(5). Powers and duties of the department and director
49-405. Attainment area designations
49-406. Nonattainment area plan
49-424. Duties of department
49-425. Rules; hearing

The NO2 I-SIP also cites the following statutes for County Programs:
49-473. Board of supervisors
49-474. County control boards
49-479. Rules; hearing

Public Notification
Both I-SIPs state, "ADEQ and those counties with authority to implement portions of the SIP (Maricopa, Pinal, and Pima counties) certify to do now and will continue to notify the public on a regular basis of instances or areas in which any primary NAAQS was exceeded, consistent with the requirements of sections 110(a)(2)(J) and 127 of the Federal Clean Air Act."

They also summarize procedures for posting air quality data to state and county websites to increase public awareness of how to prevent air quality exceedances and how they can participate in efforts to improve air quality.

PSD and Visibility Protection
In ADEQ's 2013 NO2 and SO2 I-SIPs Arizona referenced the revision to the NSR SIP submitted on October 29, 2012. It was ADEQ's hope that this would update Arizona's New Source Review/Prevention of Significant Deterioration program to fully meet the requirements of CAA section 110(a)(2)(C) for the 2010 NO2 and SO2 NAAQS.

EPA Evaluation
Consultation
The Arizona SIP contains many authorities that address the Clean Air Act requirements of section 121.

Under 49-104.A.2., the department shall "[s]timulate and encourage all local, state, regional and federal governmental agencies and all private persons and enterprises that have similar and related objectives and purposes, cooperate with those agencies, persons and enterprises and correlate department plans, programs and operations with those of the agencies, persons and enterprises." The department shall also "provide information and advice on request of any local, state or federal agencies" on matters within the scope of the department. ARS 49-104.A.4.

Under ARS 49-104.B.3. the department, through the director, shall "utilize any medium of communication, publication and exhibition when disseminating information, advertising and publicity in any field of its purposes, objectives or duties." Under ARS 49-104.B.5 the department shall "Contract with other agencies, including laboratories, in furthering any department program."

For transportation plans under 121(1), ARS 49-402.F. states that "[e]ach regional planning agency shall consult with the department of transportation to coordinate the plans developed pursuant to subsection E of this section with transportation plans developed by the department of transportation pursuant to any other law."

ARS 49-406.E requires the State, the planning agency on behalf of affected local governments, the county air pollution control department or district, and the Department of Transportation to enter into a memorandum of agreement for the purpose of coordinating the development, implementation, and enforcement of nonattainment and maintenance plans. 49-406(F) cites to minimum information that the memorandum must contain, including the responsibilities and authorities of each organization, assurances for adequate plan implementation, and procedures and responsibilities for adoption of control measures and emissions limitations.

More broadly, ARS 49-424.3 requires the department to establish substantive policy statements for identifying air quality exceptional events. These substantive policy statements "shall be developed with the planning agency certified pursuant to section 49-406, subsection A and the county air pollution control department or district." The department shall also determine the standards for the quality of the ambient air and the limits of air contaminants necessary to protect the public health "and develop and transmit to the county boards of supervisors minimum state standards for air pollution control." ARS 49-424.4. The department is required to hold hearings relating to any matter within their duties and consult with "persons or affected groups or other states to achieve the purposes of this chapter, including voluntary testing of actual or suspected sources of air pollution." The department shall also "[e]ncourage political subdivisions of the state to handle air pollution problems within their respective jurisdictions, and provide as it deems necessary technical and consultative assistance therefor." See ARS 49-424.

At the county level, under ARS 49-474 the board of supervisors of each county may authorize the board of health or health department of their respective counties in cooperation with the department of environmental quality to: "1. Study the problem of air pollution in the county; 2. Study possible effects on adjoining counties; 3. Cooperate with chambers of commerce, industry, agriculture, public officials and all other interested persons or organizations; 4. Hold public hearings if in their discretion such action is necessary; 5. The board of supervisors by resolution may establish an air pollution control district."

Public Notification
As stated in its 2013 NO2 and SO2 I-SIP submittals, ADEQ certifies that it does now and will continue to notify the public on a regular basis of instances of areas in which any primary NAAQS is exceeded, consistent with the requirements of sections 110(a)(2)(J) and 127 of the Federal Clean Air Act. As noted by ADEQ: "Such notifications are and will be available on the state and county air quality websites, which are updated daily to identify exceedances of the NAAQS that occurred during the previous day or any portion of the preceding calendar year. We commit to continue, through these websites, to advise the public of the health hazards associated with such exceedances and to increase public awareness of: (1) measures which can be taken to prevent a primary standard from being exceeded, and (2) ways in which the public can participate in regulatory and other efforts to improve air quality."

Links to state and county websites that provide current air data and previous NAAQS exceedances, as well as other educational information, are available at: http://www.azdeq.gov/environ/air/.

PSD and Visibility Protection