AIR QUALITY DIVISION HAYDEN SULFUR DIOXIDE AND LEAD, NOTICE OF PROPOSED RULEMAKING AND STATE IMPLEMENTATION PLAN (SIP) REVISIONS PUBLIC COMMENT PERIOD AND HEARING The Air Quality Division of the Arizona Department of Environmental Quality (ADEQ) welcomes comments on the proposed: SIP Revision: Rules Incorporating Hayden Smelter Permit Conditions to Supplement Arizona’s 2023 Sulfur Dioxide (SO2) SIP; SIP Revision: Rules Incorporating Hayden Smelter Permit Conditions to Supplement Arizona’s 2024 Lead (Pb) SIP; and rulemaking to amend the Arizona Administrative Code (A.A.C) Title 18, Chapter 2, Article 13 (State Implementation Plan Rules for Specific Locations) to codify the permitting conditions included in the 2023 Hayden sulfur dioxide State Implementation Plan (SIP) revision and the 2024 Hayden lead SIP revision. Doing so will facilitate EPA’s approval of the SIP revisions. Comment period: Pursuant to A.R.S. §§ 49-404 and 49-425, ADEQ opens a 30-day public comment period on September 12, 2025 on the proposed: SIP Revision: Rules Incorporating Hayden Smelter Permit Conditions to Supplement Arizona’s 2023 SO2 SIP; SIP Revision: Rules Incorporating Hayden Smelter Permit Conditions to Supplement Arizona’s 2024 Pb SIP; and rulemaking to amend A.A.C Title 18, Chapter 2, Article 13. The public comment period will end at 5 p.m. MST on October 14, 2025. Public Hearing: ADEQ will hold a public hearing at 10:30 a.m. MST on October 14, 2025, to receive verbal comments and answer questions concerning the proposed SIP revisions and rulemaking Interested parties may attend: ? Online via GoToWebinar by registering at: https://attendee.gotowebinar.com/register/4027323525405662554 After registering, you will receive a confirmation email containing information about joining the webinar. ? Or by Phone (audio only) by calling: 1 (213) 932-4212 | Webinar Code: 700-144-787. Please note that calling this number is a listen only option. You will NOT be able to speak. Audio PINs are provided to those who register for the webinar and log in using their computers. With this PIN, they will have the option to unmute themselves. Copies for Public Review: During the 30-day comment period, the SIP Revision: Rules Incorporating Hayden Smelter Permit Conditions to Supplement Arizona’s 2023 SO2 SIP; SIP Revision: Rules Incorporating Hayden Smelter Permit Conditions to Supplement Arizona’s 2024 Pb SIP; and Notice of Proposed Rulemaking, will be available online at https://azdeq.gov/rulemaking/siprules_permitterms. These documents are also available for review at the ADEQ Records Center, 1110 W. Washington St., Phoenix, AZ 85007, 602-771-4380. Please call for hours of operation and to schedule an appointment or consult https://azdeq.gov/records Instructions for Public Comments: Comments may be mailed to ADEQ, Air Quality Improvement Planning Section, 1110 W. Washington St., Phoenix, AZ 85007 or emailed to airplanning@azdeq.gov. Comments and questions may also be made during the public hearing. Close of Comment Period: Comments on the SIP revisions and proposed rulemaking must be received by ADEQ no later than 5 p.m. MST on October 14, 2025, or submitted at the public hearing on that date. Additional Information: For more Information, visit https://azdeq.gov/rulemaking/siprules_permitterms. ADEQ will take reasonable measures to provide access to department services to individuals with limited ability to speak, write or understand English and/or to those with disabilities. Requests for language translation, ASL interpretation, CART captioning services or disability accommodations must be made at least 48 hours in advance by contacting the Title VI Nondiscrimination Coordinator, Leonard Drago, at 602-771-2288 or Drago.Leonard@azdeq.gov. For a TTY or other device, Telecommunications Relay Services are available by calling 711. ADEQ tomará las medidas razonables para proveer acceso a los servicios del departamento a personas con capacidad limitada para hablar, escribir o entender inglés y/o para personas con discapacidades. Las solicitudes de servicios de traducción de idiomas, interpretación ASL (lengua de signos americano), subtitulado de CART, o adaptaciones por discapacidad deben realizarse con al menos 48 horas de anticipación comunicándose con el Coordinador de Anti-Discriminación del Título VI al 602-771-2288 o Drago.Leonard@azdeq.gov. Para un TTY u otro dispositivo, los servicios de retransmisión de telecomunicaciones están disponible llamando al 711. Pub: Sept 12, 15, 2025