RULE 32.G AND 32.J-EROPNOTICEREPORTTOBOS-DRAFTSIPSUBMITTAL-NOVEMBER-2023.PDF

Maricopa County — Formal (2023-11-01)

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Air Quality Department 
301 W. Jefferson St., Suite 410  
Phoenix, Arizona 85003 
P: 602-506-6010 
E: AQMail@maricopa.gov 
 
 
Enhanced Regulatory Outreach Program 
Maricopa County Air Quality Department 
Notice of Public Hearing 
Subject: 
Rescission and Replacement of Paragraph G and 
Paragraph J of Rule 32 (Odors and Gaseous Emissions) 
Date/Time:  
Wednesday, November 1, 2023, at 9:30 a.m. 
Location:  
Board of Supervisors’ Auditorium 
205 W. Jefferson St., Phoenix, Arizona 85003 
The Maricopa County Board of Supervisors is scheduled to conduct a public hearing to solicit 
comments on a proposed revision to the Arizona State Implementation Plan (SIP). The 
Maricopa County Air Quality Department (MCAQD) is proposing to rescind Paragraphs G and J 
of Rule 32 (Odors of Gaseous Emission) from the Arizona SIP and to replace the paragraphs 
with Sections 306 and 307 of Rule 320 (Odors and Gaseous Air Contaminants). This action is 
part of a larger SIP recodification project that was initiated in 2017 to rescind and replace the 
Maricopa County Air Quality Department’s (MCAQD) outdated two-digit SIP approved rules 
with current three-digit rules to update the SIP.  
You may comment on the proposed SIP revision using the Enhanced Regulatory Outreach 
Program (EROP)  online comment form. 
The Board of Supervisors meeting will be held in-person and have an option to attend virtually. 
If you wish to participate virtually, please check the Board of Supervisors’ website at least 24 
hours before the date of the public hearing for directions for remote access. 
For more information regarding this SIP revision, please refer to the Report to the Board of 
Supervisors attached to this notice and available on the EROP Active Regulatory Process 
webpage. A copy of the SIP revision will be available at least 30 days prior to the hearing for 
public inspection at the offices of the Maricopa County Air Quality Department, 301 West 
Jefferson Street, Suite 410, Phoenix, Arizona 85003. The SIP submittal will also be available on 
the EROP Active Regulatory Process webpage at least 30 days prior to the hearing. In

Air Quality Department 
301 W. Jefferson St., Suite 410  
Phoenix, Arizona 85003 
 
P: 602-506-6010 
E: AQMail@maricopa.gov 
addition, copies of the Report to the Board of Supervisors and the SIP revision can be obtained 
by calling 602-506-6010. 
MCAQD 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 interpretation services or for disability accommodations must be made 
at least 48 hours in advance by contacting: 602-506-6443. 
MCAQD tomará las medidas necesarias para brindar acceso a los servicios del 
departamento a personas que no dominan el idioma inglés y/o personas con 
discapacidades. Las solicitudes de servicios de interpretación de otro idioma o adaptaciones 
para discapacitados deben realizarse con al menos 48 horas de anticipación comunicándose 
con: 602-506-6443.

Maricopa County 
Air Quality Department 
Planning and Analysis Division 
Report to the 
Board of 
Supervisors 
RESCISSION AND 
REPLACEMENT OF 
PARAGRAPH G 
AND  
PARAGRAPH J OF 
RULE 32 (ODORS AND 
GASEOUS EMISSIONS)
November 2023

Board Hearing Date: 
Case Number/Title:  
Agenda Item: 
Supervisor Districts: 
Applicant:  
Request: 
Staff 
Recommendation: 
Board of Health 
Recommendation: 
Additional Comments: 
Presented By: 
Prepared By: 
Attachments: 
November 1, 2023 
Rescission and Replacement of Paragraph G and Paragraph J of 
Rule 32 in the Arizona State Implementation Plan (SIP) 
(Pending) 
All Districts 
Staff 
Approve the proposed rescission of Paragraph G (Other 
Industries) and Paragraph J (Operating Requirements for an 
Asphalt Kettle) of Rule 32 (Odors and Gaseous Emissions) 
from the Arizona SIP and approve submission of Sections 
306 (Limitation – Sulfur from Other Industries) and 307 
(Operating Requirements – Asphalt Kettles and Dip Tanks) 
of Rule 320 (Odors and Gaseous Air Contaminants) into the 
Arizona SIP. 
This action is part of a larger SIP recodification project that 
was initiated in 2017 to rescind and replace the Maricopa 
County Air Quality Department’s (MCAQD) outdated two-digit 
SIP approved rules with current three-digit rules to update 
the SIP. The United States Environmental Protection Agency 
advised MCAQD to submit Sections 306 and 307 of Rule 320 
to replace the outdated two-digit rules 32.G and 32.J. The 
provisions of Section 306 and Section 307 are at least as 
stringent as the outdated SIP approved rules. 
Approve 
As no changes to Rule 320 were proposed the rule was not 
presented to the Board of Health. 
A newspaper notice of the Board of Supervisors public 
hearing will be published in the Arizona Business Gazette on 
September 28, 2023 and October 5, 2023. The draft SIP 
submittal is attached to this report. 
Philip A. McNeely, R.G., Director 
Planning and Analysis Division 
Draft SIP submittal

Maricopa County 
Air Quality Department 
Division Name 
Maricopa.gov/AQ

Maricopa County 
Air Quality Department 
Planning and Analysis Division 
REVISION TO 
ARIZONA’S STATE 
IMPLEMENTATION 
PLAN (SIP) 
RESCISSION AND 
REPLACEMENT OF 
PARAGRAPH G  
AND  
PARAGRAPH J  
OF RULE 32 (ODORS AND 
GASEOUS EMISSIONS)
November 2023 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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Table of Contents 
Section 1: Introduction ...................................................................................................... 3 
1.1 
Purpose: ................................................................................................................... 3 
1.2 
Regulatory Background: ............................................................................................ 3 
Section 2: Completeness Criteria ....................................................................................... 4 
2.1 
Administrative Materials: .......................................................................................... 4 
2.2 
Technical Support: .................................................................................................... 8 
Appendix 1: Notice of Board of Supervisors’ Public Hearing and Affidavit of Publication for 
Adoption of Sections 306 and 307 of Rule 320 ..................................................................11 
Appendix 2: Board of Supervisors’ Approval for Adoption of Sections 306 and 307 of Rule 
320 ..................................................................................................................................12 
Appendix 3: Affidavit of Publication for Notice of Final Rulemaking for Adoption of Sections 
306 and 307 of Rule 320 ...................................................................................................13 
Appendix 4: Relevant Arizona Revised Statutes .................................................................14 
Appendix 5: Strikethroughs of Paragraphs G and J of Rule 32 ............................................15 
Appendix 6: Clean Version of Rule 32 After Rescission of Paragraphs G and J ...................16 
Appendix 7: Strikethroughs of all Sections in Rule 320 except for Sections 306 and 307 ....17 
Appendix 8: Clean Version of Sections 306 and 307 for Incorporation into SIP ...................20 
Appendix 9: Notice of Board of Supervisors’ Public Hearing and Affidavit of Publication for 
Rescission and Replacement of Paragraphs G and J of Rule 32 in the Arizona SIP ..............21 
Appendix 10: Board of Supervisors’ Approval for Rescission and Replacement of Paragraphs 
G and J of Rule 32 in the Arizona SIP ................................................................................22 
 
 
 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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Section 1: Introduction 
1.1 
Purpose: 
The Maricopa County Air Quality Department (MCAQD) is requesting that the U.S. 
Environmental Protection Agency (EPA) rescind (remove) from the Arizona SIP 
Rule 32 (Odors of Gaseous Emission), Paragraph G (Other Industries) and 
Paragraph J (Operating Requirements for an Asphalt Kettle) and approve into the 
Arizona SIP Rule 320 (Odors and Gaseous Air Contaminants), Section 306 
(Limitation – Sulfur from Other Industries) and Section 307 (Operating 
Requirements – Asphalt Kettles and Dip Tanks). 
Sections 306 and 307 of Rule 320 will replace the existing approved SIP Rules 
32.G and 32.J with requirements that are either as stringent as or more stringent 
than the existing approved SIP rules. 
This action is related to the September 2017 SIP submittal titled “Revisions to the 
Arizona’s State Implementation Plan” which requested the withdrawal and 
replacement of MCAQD’s two-digit SIP approved rules with current three-digit 
rules to update the SIP. This submittal supersedes the 2017 SIP submittal 
regarding the request to rescind Rules 32.G and 32.J without replacement. 
1.2 
Regulatory Background: 
SIP Rule 32, Paragraph G 
Rule 32.G was adopted on October 1, 1975 and approved by the EPA for 
incorporation into the Arizona SIP on April 12, 1982 (47 FR 15579). The purpose 
of Rule 32.G is to prohibit a person from emitting into the atmosphere reduced 
sulfur in excess of 10% of the sulfur entering a process as feed. Because this 
provision may reduce emissions for sulfur dioxide, it can only be rescinded if it is 
replaced by a provision that ensures equivalent or greater emission reductions of 
reduced sulfur. 
Rule 320, Section 306 
Rule 320 was originally adopted by the Maricopa County Board of Supervisors on 
July 13, 1988 and was revised one time thereafter on July 2, 2003. Rule 320 § 
306 mirrors the language in Rule 32.G making it as stringent as Rule 32.G. 
Therefore, Rule 32.G can be replaced by Rule 320 § 306 to update the Arizona 
SIP. 
 
 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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SIP Rule 32, Paragraph J 
Rule 32.J was adopted on June 23, 1980 and approved by the EPA for 
incorporation into the Arizona SIP on April 12, 1982 (47 FR 15579). The purpose 
of Rule 32.J is to establish operational requirements primarily to reduce the 
potential for nuisance odors from asphalt kettles and dip tanks through the use 
of “good modern practices”. These practices include maintaining temperatures 
below both the asphalt flash point and the maximum temperature recommended 
by the asphalt manufacturer through the use of automatic temperature controls, 
operating with lids closed except when charging, using a clean burning fuel, and 
maintaining the kettle or dip tank in clean, properly adjusted and good operating 
condition. 
Rule 320, Section 307 
Rule 320 was originally adopted by the Maricopa County Board of Supervisors on 
July 13, 1988 and was revised one time thereafter on July 2, 2003. Rule 320 § 
307 mirrors SIP Rule 32.J and has an additional provision that requires a person 
to comply with the visible emission and opacity standards prescribed in SIP Rule 
300 (75 FR 44141, July 28, 2021). Therefore, Section 307 is more stringent than 
SIP Rule 32.J. and is an adequate replacement to update the Arizona SIP. 
As part of the 2017 SIP Recodification Project, the MCAQD submitted a request 
to the EPA to rescind Rules 32.G and 32.J from the SIP without replacement. The 
EPA identified approvability issues with that request and advised the MCAQD to 
submit Sections 306 and 307 of Rule 320 to replace the outdated two-digit rules. 
The provisions of Section 306 and Section 307 are at least as stringent as the 
outdated SIP approved rules, thus MCAQD is submitting Sections 306 and 307 of 
Rule 320 as a revision to the Arizona SIP to replace Rules 32.G and 32.J. 
Section 2: Completeness Criteria 
2.1 
Administrative Materials: 
2.1(a) 
A formal letter of submittal from the MCAQD Director or designee, 
requesting the EPA approval of the SIP revision. 
See SIP submission cover letter from Philip A. McNeely, Director of 
MCAQD, included above. 
2.1(b) 
Evidence that MCAQD has adopted the SIP revision in the State 
code or body of regulations; or issued the permit, order, consent 
agreement in final form. 
The Maricopa County Board of Supervisors adopted Sections 306 
and 307 as part of revisions to Rule 320 on July 2, 2003. See 
Appendix 2 of this document. 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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The Maricopa County Board of Supervisors approved the rescission 
and replacement of Rules 32.G and 32.J with Sections 306 and 307 
of Rule 320 on [insert date]. See Appendix 10 of this document. 
2.1(c) 
Evidence that MCAQD has the necessary legal authority under 
State law to adopt and implement the SIP revision. 
Arizona Revised Statutes (A.R.S.) §§ 49-112, 49-471.09, 49-474, 
and 49-479 authorize MCAQD to submit rule revisions for approval 
in the SIP. 
See Appendix 4 of this document. 
2.1(d) 
A copy of the actual regulations, or documents submitted for 
approval and incorporation by reference into the plan, including 
indication of the changes made to the existing approved plan, 
where applicable. 
See Appendix 5 for the changes made to the existing approved plan 
showing strikethroughs for all of Paragraph G and all of Paragraph 
J of Rule 32. 
See Appendix 6 which shows Rule 32 after Paragraphs G and J 
have been rescinded. Paragraphs H and K will be the only two 
paragraphs that remain in Rule 32.  
See Appendix 7 which includes Rule 320 showing all sections 
stricken except for Sections 306 and 307. All other sections are 
stricken so as to not be part of this SIP revision request. 
See Appendix 8 which includes only Sections 306 and 307 of Rule 
320 to be incorporated into the SIP. 
2.1(e) 
Evidence that MCAQD followed all of the procedural requirements 
of the State’s laws and constitution in conducting and completing 
the adoption/issuance of the plan. 
MCAQD completed all procedural requirements for obtaining 
approval to adopt the revisions of Sections 306 and 307 of Rule 
320 as described in items (1) through (6) below. 
MCAQD completed all procedural requirements for obtaining 
approval for the rescission of Paragraphs G and J of Rule 32 from 
the SIP and submission of Sections 306 and 307 of Rule 320 into 
the SIP as described in items (7) through (8) below. 
The publications cited in items (1) through (6) included other 
rulemakings in addition to Rule 320. For this SIP submittal request, 
only the rulemaking actions regarding Rule 320 are relevant. The 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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additional information regarding Rules 280, 311, 322, and 323 is 
outdated and not associated with this SIP submittal request.  
(1) 
Published a Notice of Rulemaking Docket Opening in the 
Arizona Administrative Register (A.A.R.): 
Volume #8 A.A.R. Issue#39, September 27, 2002 
(2) 
Published a Notice of Proposed Rulemaking in the A.A.R.: 
Volume #8 A.A.R. Issue # 45, November 8, 2002 
(3) 
Published a Notice of Board of Supervisors Public Hearing 
and Newspaper Affidavit dated June 4, 2003 to provide the 
public at least 30 days to comment on the proposed 
changes to Rule 320 (See Appendix 1) 
(4) 
Certified Minutes of Board of Supervisors Public Hearing 
Approving Adoption of Proposed Revisions to Rule 320 
dated July 2, 2003 (See Appendix 2) 
(5) 
Newspaper Affidavit for Notice of Final Rulemaking dated 
July 17, 2003 (See Appendix 3) and  
(6) 
Published a Notice of Final Rulemaking in A.A.R.: 
Volume #9, A.A.R. Issue #31, August 1, 2003 
(7) 
Published a Notice of Board of Supervisors Public Hearing 
and Newspaper Affidavit dated [insert date] to provide the 
public at least 30 days to comment on the SIP revision 
submission (See Appendix 9) 
(8) 
Certified Minutes of Board of Supervisors Public Hearing 
Approving the SIP revision submission dated [insert date] 
(See Appendix 10) 
2.1(f) 
Evidence that public notice was given of the proposed change 
consistent with procedures approved by the EPA, including the 
date of publication of such notice. 
See 2.1(e)(2) and Appendix 1 for evidence that MCAQD gave public 
notice of the proposed regulatory change, including the date of 
publication of such notice for Rule 320. 
See Appendix 9 for evidence that MCAQD gave public notice of the 
SIP revision submission including the date of publication of such 
notice. 
2.1(g) 
Certification that public hearing(s) were held in accordance with 
the information provided in the public notice and the State’s laws 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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and constitution, if applicable and consistent with the public 
hearing requirements in 40 CFR 51.102. 
See Appendices 1 and 2 for certification that a public hearing was 
properly held for Sections 306 and 307 of Rule 320. 
See Appendices 9 and 10 for certification that a public hearing was 
properly held for the SIP revision submission. 
2.1(h)  
Compilation of public comments and MCAQD’s response. 
There were no written comments from stakeholders regarding the 
amendments to Rule 320 at the time of the rulemaking; therefore, 
no public comments were received regarding Sections 306 or 307. 
See 2.1(e)(6) for the Notice of Final Rulemaking, page 3393. This 
notice included separate and unrelated rulemaking actions for 
Rules 280, 311, 322, and 323 and had no bearing on the rulemaking 
actions for Rule 320. 
Any comments received during the public comment period or 
during the public hearing regarding the SIP revision submittal will 
be provided. 
 
 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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2.2 
Technical Support: 
2.2(a)  
Identification of all regulated pollutant(s) affected by the plan. 
The regulated pollutants affected by this plan are sulfur dioxide 
(Section 306) and volatile organic compounds, nitrogen oxides, and 
carbon monoxides (Section 307). 
2.2(b) 
Identification of the locations of affected sources including the 
EPA attainment/nonattainment designation of the locations and 
the status of the attainment plan for the affected area(s). 
Sections 306 and 307 of Rule 320 are applicable to all areas and 
sources of reduced sulfur emission from any industry using sulfur 
as process feed, asphalt kettles, or dip tanks under the MCAQD’s 
jurisdiction. 
EPA attainment/nonattainment designations for all or parts of 
Maricopa County are: 
1987 PM10 Standard: 
Serious Nonattainment 
(June 10, 1996) 
2008 Ozone Standard: 
Moderate Nonattainment 
(May 4, 2016) 
2015 Ozone Standard: 
Moderate Nonattainment 
(November 7, 2022) 
1971 Carbon Monoxide Standard: 
2008 Lead Standard: 
Attainment (April 8, 2005) 
Unclassified/Attainment 
(December 31, 2011) 
2010 Nitrogen Oxides Standard: 
Unclassified/Attainment  
(January 31, 2012) 
2010 Sulfur Dioxide Standard: 
Unclassified/Attainment  
(April 19, 2018) 
2012 PM2.5 Standard: 
Unclassified/Attainment 
(April 15, 2015) 
The status of attainment plans for Maricopa County are: 
2012 Five Percent Plan: 
Approved (June 10, 2014) 
2017 MAG Ozone Moderate Plan: 
Approved (July 2, 2020) 
2.2(c) 
Quantification of the changes in plan allowable emissions from the 
affected sources; estimates of changes in current actual 
emissions from affected sources or, where appropriate, 
quantification of changes in actual emissions from affected 
sources through calculations of the differences between certain 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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baseline levels and allowable emissions anticipated as a result of 
the revision. 
The provisions in Section 306 and 307 of Rule 320 mirror what is 
already in SIP Rule 32.G and Rule 32.J and, therefore will not result 
in any changes to allowable or actual emissions from existing 
sources. 
2.2(d) 
MCAQD’s demonstration that the national ambient air quality 
standards, prevention of significant deterioration increments, 
reasonable further progress demonstration, and visibility, as 
applicable, are protected if the plan is approved and implemented. 
The provisions in Section 306 and 307 of Rule 320 mirror what is 
already in SIP Rule 32.G and Rule 32.J and therefore, continue to 
protect national ambient air quality standards, prevention of 
significant deterioration increments, reasonable further progress 
demonstration, and visibility, as applicable. 
2.2(e) 
Modeling information required to support the proposed revision, 
including input data, output data, models used, justification of 
model selections, ambient monitoring data used, meteorological 
data used, justification for use of offsite data (where used), modes 
of models used, assumptions, and other information relevant to 
the determination of adequacy of the modeling analysis. 
Not applicable. 
2.2(f) 
Evidence, where necessary, that emission limitations are based on 
continuous emission reduction technology. 
Not applicable. 
2.2(g) 
Evidence that the plan contains emission limitations, work 
practice standards and recordkeeping/reporting requirements, 
where necessary, to ensure emission levels. 
See Appendix 8. The provisions in Section 306 and 307 mirror what 
is already in SIP Rule 32.G and Rule 32.J and do not modify any 
emission limits. 
2.2(h) 
Compliance/enforcement strategies, including how compliance 
will be determined are in practice. 
The MCAQD will determine compliance by conducting periodic 
inspections as is current practice. Enforcement of the rule will 
continue to occur though permit requirements and enforcement 
action per current department policies and procedures. 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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2.2(i) 
Special economic and technological justifications required by any 
applicable EPA policies, or an explanation of why such 
justifications are not necessary. 
Not applicable. Special economic and technological justifications 
are not necessary because the provisions in Sections 306 and 307 
are analogous to what is already in SIP Rules 32.G and 32.J. There 
are no anticipated economic or technological impacts to the 
regulated community. 
 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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Revision to Arizona's SIP 
Sections 306 and 307 of Rule 320 of the 
MCAPCR 
Appendix 1: Notice of Board of Supervisors’ Public Hearing 
and Affidavit of Publication for Adoption of Sections 306 
and 307 of Rule 320 
 
This notice includes separate rulemaking actions for Rules 311, 320, 322, and 
323. For this SIP submittal request, only the notifications and rulemaking 
actions regarding Rule 320 are relevant. The additional information regarding 
Rules 311, 322, and 323 is outdated and not associated with Rule 320. 
 
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NOTICE OF PUBLIC HEARING 
FOR MARICOPA COUNTY AIR POLLUTION CONTROL REGULATIONS 
AND STATE IMPLEMENTATION PLAN (SIP) REVISIONS 
 
Notice is hereby given that the Maricopa County Board of Supervisors will conduct a public hearing on July 2, 
2003 at 9:00 AM on proposed revisions to the Maricopa County Air Pollution Control Regulations, RULE 311 
(PARTICULATE MATTER FROM PROCESS INDUSTRIES) and RULE 320 (ODORS AND GASEOUS AIR 
CONTAMINANTS). The hearing will also address proposed new RULE 322 (POWER PLANT OPERATIONS) 
and RULE 323 (FUEL BURNING EQUIPMENT FROM INDUSTRIAL/COMMERCIAL/INSTITUTIONAL 
SOURCES). The Public Hearing will be held at the Maricopa County Board of Supervisors’ Auditorium, 205 
West Jefferson Street, Phoenix, Arizona.  Call 602-506-0169 for current information.  Copies of the final draft 
rule will be available at least 30 days prior to the hearing for public inspection at the offices of the Maricopa 
County Environmental Services Department, Air Quality Division, 1001 N. Central Ave. #201, Phoenix, AZ., 
85004, phone 602-506-6010, and on the internet at http://www.maricopa.gov/envsvc/air/workshops.asp. A sign 
language interpreter, alternative form materials, or infrared assistive listening devices will be made available upon 
request with 72 hours notice. Additional reasonable accommodations will be made available to the extent possible 
within the time frame of the request. Requests should be made to 602-506-3751 or TTY 602-506-2000. 
 
PUBLISH MAY 28, 2003 and JUNE 4, 2003. 
 
 
 
 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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Revision to Arizona's SIP 
Sections 306 and 307 of Rule 320 of the 
MCAPCR 
Appendix 2: Board of Supervisors’ Approval for Adoption of 
Sections 306 and 307 of Rule 320 
 
This notice includes separate rulemaking actions for Rules 311, 320, 322, and 
323. For this SIP submittal request, only the notifications and rulemaking 
actions regarding Rule 320 are relevant. The additional information regarding 
Rules 311, 322, and 323 is outdated and not associated with Rule 320. 
 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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Revision to Arizona's SIP 
Sections 306 and 307 of Rule 320 of the 
MCAPCR 
Appendix 3: Affidavit of Publication for Notice of Final 
Rulemaking for Adoption of Sections 306 and 307 of Rule 320 
 
This notice includes separate rulemaking actions for Rules 311, 320, 322, and 
323. For this SIP submittal request, only the notifications and rulemaking 
actions regarding Rule 320 are relevant. The additional information regarding 
Rules 311, 322, and 323 is outdated and not associated with Rule 320. 
 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
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Revision to Arizona's SIP 
Sections 306 and 307 of Rule 320 of the 
MCAPCR 
Appendix 4: Relevant Arizona Revised Statutes 
 
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49-112. County regulation; standards
A. When authorized by law, a county may adopt a rule, ordinance or regulation that is more
stringent than or in addition to a provision of this title or rule adopted by the director or any
board or commission authorized to adopt rules pursuant to this title if all of the following
requirements are met:
1. The rule, ordinance or regulation is necessary to address a peculiar local condition.
2. There is credible evidence that the rule, ordinance or regulation is either:
(a) Necessary to prevent a significant threat to public health or the environment that results
from a peculiar local condition and is technically and economically feasible.
(b) Required under a federal statute or regulation, or authorized pursuant to an
intergovernmental agreement with the federal government to enforce federal statutes or
regulations if the county rule, ordinance or regulation is equivalent to federal statutes or
regulations.
3. Any fee or tax adopted under the rule, ordinance or regulation does not exceed the
reasonable costs of the county to issue and administer the permit or plan approval
program.
B. When authorized by law, a county may adopt rules, ordinances or regulations in lieu of a
state program that are as stringent as a provision of this title or rule adopted by the director
or any board or commission authorized to adopt rules pursuant to this title if the county
demonstrates that the cost of obtaining permits or other approvals from the county will
approximately equal or be less than the fee or cost of obtaining similar permits or
approvals under this title or any rule adopted pursuant to this title. If the state has not
adopted a fee or tax for similar permits or approvals, the county may adopt a fee when
authorized by law in the rule, ordinance or regulation that does not exceed the reasonable
costs of the county to issue and administer that permit or plan approval program.
C. A county that adopts rules, ordinances or regulations pursuant to subsection B of this
section and that at any time cannot comply with subsection B of this section shall prepare
and file a notice of noncompliance with the director. The county shall post a copy of the
notice of noncompliance on the county's website with a date stamp of the date of posting.
If the county does not comply with subsection B of this section within one year after
posting of the notice on the county's website, the director shall provide written notice to
and assert regulatory jurisdiction over those persons and entities subject to the affected
county rules, ordinances or regulations.
D. Except as provided in chapter 3, article 3 of this title, before adopting or enforcing any rule,
ordinance or regulation pursuant to subsection A or B of this section, the county shall
comply with the following requirements:
1. Prepare a notice of proposed rulemaking to include the proposed rule, ordinance or
regulation.  This notice shall demonstrate evidence of compliance with subsection A or B
of this section. The notice shall include the name, address and phone number of a person
who can answer questions about the proposed rule, ordinance or regulation and accept any
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written requests for the county to conduct an oral proceeding. The county shall post the 
notice on the county's website with a date stamp of the date of posting.  The county shall 
publish the availability of the notice of the proposed rule, ordinance or regulation in a 
newspaper of general circulation in the county. If there is no newspaper of general 
circulation in the county, the county shall publish the notice in a newspaper of general 
circulation in an adjoining county. If requested by the public, the county shall make 
available a paper copy of the notice at a reasonable cost. 
2. For at least thirty days after the posting of the notice of the proposed rule, ordinance or
regulation, afford persons the opportunity to submit in writing comments, statements,
arguments, data and views on the proposed rule, ordinance or regulation.
3. Respond in writing to the comments submitted pursuant to paragraph 2 of this subsection
and post the county's response on the county's website. If requested by the public, the
county shall make paper copies of its comments available at a reasonable cost.
4. Schedule a public hearing on the proposed rule, ordinance or regulation if a written request
for an oral proceeding is submitted to the county during the thirty-day comment period.
The county shall post the notice of oral proceeding on a proposed rule, ordinance or
regulation on the county's website. The county shall post the notice of oral proceeding at
least twenty days before the date of the oral proceeding. The county shall publish notice of
any public hearing required pursuant to this paragraph in any newspaper as prescribed by
this title or county ordinance. The county shall select a time and location for the public
hearing that affords a reasonable opportunity for the public to participate.
E. A county is not required to comply with subsection D, paragraphs 2, 3 and 4 of this section
before it adopts or enforces a rule, ordinance or regulation if the rule, ordinance or
regulation only incorporates by reference an existing state or federal rule or law that
provides greater regulatory flexibility for regulated parties and otherwise satisfies the
requirements prescribed in subsection B of this section.
F. Until June 30, 1995, a person may file with the clerk of the board of supervisors for that
county a petition challenging a county rule, ordinance or regulation adopted before July 15,
1994 for compliance with the criteria set forth in subsection A or B of this section. The
petition shall contain the grounds for challenging the specific county rule, ordinance or
regulation. Within one year after the petition is filed, the board of supervisors shall review
the challenged rule, ordinance or regulation and make a written demonstration of
compliance with the criteria set forth in subsection A or B of this section and challenged in
the petition. Any rules, ordinances or regulations that have been challenged and for which
the board of supervisors has not made the written demonstration within one year after the
filing of the petition required by this section become unenforceable as of that date. If a
county has already made a written demonstration under section 49-479, subsection C, for a
rule, ordinance or regulation, the person filing the petition shall state the specific grounds in
the petition why that demonstration does not meet the requirements of this section.
G. A rule, ordinance or regulation adopted pursuant to subsection A of this section may not be
invalidated subsequent to its adoption on the grounds that the economic feasibility
analysis is insufficient or inaccurate if a county makes a good faith effort to comply with
the economic feasibility requirement of subsection A, paragraph 2, subdivision (a), of this
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section and has explained in the written statement, made public pursuant to subsection D 
of this section, the methodology used to satisfy the economic feasibility requirement. 
H. This section shall not apply to any rule, ordinance or regulation adopted by a county
pursuant to:
1. Title 36 for which the state has similar statutory or rule making authority in this title.
2. Section 49-391.
3. Chapter 3, article 8 of this title.
4. Chapter 4, article 3 of this title and section 49-765.
5. Nonsubstantive rules relating to the application process that have a de minimis economic
effect on regulated parties.
49-471.09. County rule or ordinance making record
A. A control officer shall maintain for public inspection an archive of a rule or ordinance
making record for each proposed rule or ordinance for which a notice is posted on the
county's website and each final rule or ordinance posted on the county's website.
B. The county archive of a rule or ordinance making record shall contain all of the following:
1. Copies of all postings on the county's website with respect to the rule or ordinance.
2. All written petitions, requests, submissions and comments received by the county and all
other written materials considered or prepared by a control officer in connection with the
rule or ordinance.
3. Any official transcript of oral presentations made in the proceeding on which the rule or
ordinance is based, and any tape recording or stenographic record of those presentations,
and any memorandum summarizing the contents of those presentations.
4. A copy of any materials, documents or meeting minutes submitted to the board of
supervisors.
5. A copy of the final rule or ordinance adopted by the board of supervisors and the preamble,
concise explanatory statement and response to comments.
49-474. County control boards
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.
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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.
49-479. Rules; hearing
A. The board of supervisors shall adopt such rules as it determines are necessary and
feasible to control the release into the atmosphere of air contaminants originating within
the territorial limits of the county or multi-county air quality control region in order to control
air pollution, which rules, except as provided in subsection C shall contain standards at
least equal to or more restrictive than those adopted by the director. In fixing such
standards, the board or region shall give consideration but shall not be limited to:
1. The latest scientific knowledge useful in indicating the kind and extent of all identifiable
effects on health and welfare which may be expected from the presence of an air pollution
agent, or combination of agents in the ambient air, in varying quantities.
2. Atmosphere conditions and the types of air pollution agent or agents which, when present
in the atmosphere, may interact with another agent or agents to produce an adverse effect
on public health and welfare.
3. Securing, to the greatest degree practicable, the enjoyment of the natural attractions of the
state and the comfort and convenience of the inhabitants.
B. No rule may be enacted or amended except after the board of supervisors first holds a
public hearing after twenty days' notice of such hearing. The proposed rule, or any
proposed amendment of a rule, shall be made available to the public at the time of notice
of such hearing.
C. A county may adopt or amend a rule, emission standard, or standard of performance that is
as stringent or more stringent than a rule, emission standard or standard of performance
for similar sources adopted by the director only if the county complies with the applicable
provisions of section 49-112.
D. All rules enacted pursuant to this section shall be made available to the public at a
reasonable charge upon request.
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
15 
Revision to Arizona's SIP 
Sections 306 and 307 of Rule 320 of the 
MCAPCR 
Appendix 5: Strikethroughs of Paragraphs G and J of Rule 32 
(Indicating the Rescission of Paragraphs G and J Only) 
 
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G.
Other Industries
J. No person shall discharge into the atmosphere from any
other industry not covered in other rules o f  this section re-
duced sulfur. which includes sulfur equivalent from all sul-
fur emissiom including but not limited to sulfur dioxide,
sulfur trioxide and sulfuric acid, in excess o f  ten (JO) per-
cent o f  the sulfur entering the process as feed.
Added 10-1-75 
H.
Fuel Burning Equipment for Producing Electric Power
(Sulfur Dioxide)
J. This rule applies to an installation operated for the purpose
o f  producing electric power with a resulting discharge o f
sulfur dioxide in the installation's cffiuent gasc .
2. Steam power generating installations which are new sources
shall not emit more than 0.80 pounds o f  sulfur dioxide,
maximum two hour average, per million BTU heat input
when oil is fired. 
Steam power generating installations
. which are existing sources shall nnt emit more than 1.0
pounds o f  sulfur dioxide, maximum two hour average, per
million BTU heat input when low sulfur oil is fired.
3. Steam power generating installations which are existing
RULE 32. Odors and Gaseous Emissions
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------ ------
---------------- -- ----- -
----------------------
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-------- ----------- ----------
----------
----------- -
--- ---------- ---
--
/ 
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-
---- -----------· I, 
--------------
--- - _________.,. 
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sources shall not emit more than 2_2 pounds of sulfur di­
oxide. maximum two hour average, per million BTU he;it 
in-put when high sulfur oil is fired_ ' 
4. Any pennir issued for the operation of an existing source, 
or :iny renewal or modification of such a permit, shall in­
clude a condition prohibiting the use of high sulfur oil by 
the pcrmitree. except that if the applicant demonstrates 
to the satisfaction of the control officer: (a) that suffic­
ient quantities of low sulfur oil are not available for use by 
the source, and (b) that ii has adequate facilities and ~r.­
tingency plans to insure that the sulfur dioxide ambient air 
-quality standards set forth in Regulation VII, Rule 70 will 
not be violated. The tenns of the pennit may authorize the 
use of high sulfur oil under such conditions as are justified. 
In cases where the pcrmittee is authorized to use high sulfur 
oil. ii shall submit to the bureau monthly reports detailing 
its efforts to obtain lo..w sulfur oil. When the conditions jus­
tifying the use qf high sulfur oil no longer exist, the pcnnit 
shall be modified'accordingly. 
S. For purposes of this rule. low sulfur oil means fuel oil con­
taining less than 0.90 percent by weight of sulfur and high 
sulfur oil means fuel oil containing 0.90 percent or more by 
weight ofsulfur. 
6. Steam power generating installations which are new sources ­
shall not emit more than 0.80 pounds of sulfur dioxide, 
maximum two hour average. per million BTU heat input 
when coal is fired. Steam power generating installations 
_ 
which are existing sources shall not emit more than LO 
pounds of sulfur dioxide. Maximum two hour average, per 
million BTU heat input when coal is fired_ 
----~--------­
J. 
No person shall operate an asphalt kettle unless he controls air 
contaminant emissions by good modem practices including 
but not limited to: (I) maintenance of temperature beiow 
both the asphalt flash point and the maximum temperature 
recommended by the asphalt manufacturer through the-itse of 
automatic tc.,nperature controls. (2) operation of .the Kettle 
with the lid closed except when charging, (3) pumping the as­
phalt from the kettle. (4) drawing the asphalt through cocks 
without dipping, (5) firing of the kettle with a clean burning 
­
fuel and (6) maintaining the kettle in clean, properly adjusted 
and good operatiug condition. 
K. The discharge of carbon monoxide emissions from any process 
source shall br effectively controlled by means of secondary 
combustion_ 
( 
i 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
16 
Revision to Arizona's SIP 
Sections 306 and 307 of Rule 320 of the 
MCAPCR 
Appendix 6: Clean Version of Rule 32 After Rescission of 
Paragraphs G and J 
(Indicating only Paragraphs H and K remain in Rule 32) 
 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
17 
 
Revision to Arizona's SIP 
Sections 306 and 307 of Rule 320 of the 
MCAPCR 
Appendix 7: Strikethroughs of all Sections in Rule 320 except 
for Sections 306 and 307 
(Locally Adopted July 2, 2003) 
 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
18 
 
Revised 07/13/88; Revised 07/02/03 
MARICOPA COUNTY 
AIR POLLUTION CONTROL REGULATIONS 
REGULATION III – CONTROL OF AIR CONTAMINANTS 
RULE 320 (ODORS AND GASEOUS AIR CONTAMINANTS) 
SECTION 100 – GENERAL 
101 
PURPOSE: To limit the emissions of odors and other gaseous air contaminants into 
the atmosphere. 
SECTION 200 – DEFINITIONS: For the purpose of this rule, the following definitions shall apply: 
201 
HIGH SULFUR OIL: Fuel oil containing 0.05 percent or more by weight of sulfur. 
202 
LOW SULFUR OIL: Fuel oil containing less than 0.05 percent by weight of sulfur. 
203 
ODORS: Smells, aromas or stenches commonly recognized as offensive, 
obnoxious or objectionable to a substantial part of a community. 
204 
REDUCTION: Any heated process, including rendering, cooking, drying, dehydrating, 
digesting, evaporating and protein concentrating. 
SECTION 300 – STANDARDS: No person shall emit gaseous or odorous air contaminants from 
equipment, operations or premises under his control in such quantities or concentrations as to 
cause air pollution. 
301 
ANIMAL AND VEGETABLE MATTER REDUCTION: No person shall operate or use any 
machine, equipment or other contrivance for the reduction of animal or vegetable 
matter, separately or in combination, unless all gases, vapors and gas-entrained 
effluents have been incinerated to destruction at a temperature of not less than 1,300 
degrees fahrenheit or processed in a manner determined by the Control Officer to be 
equally or more effective for the control of air pollution. 
302 
MATERIAL CONTAINMENT REQUIRED: Materials including, but not limited to, solvents 
or other volatile compounds, paints, acids, alkalies, pesticides, fertilizer and manure 
shall be processed, stored, used and transported in such a manner and by such means 
that they will not unreasonably evaporate, leak, escape or be otherwise discharged into 
the ambient air so as to cause or contribute to air pollution. Where means are available 
to reduce effectively the contribution to air pollution from evaporation, leakage or 
discharge, the installation and use of such control methods, devices or equipment 
shall be mandatory. 
303 
REASONABLE STACK HEIGHT REQUIRED: Where a stack, vent or other outlet is at 
such a level that air contaminants are discharged to adjoining property, the Control 
Officer may require the installation of abatement equipment or the alteration of such 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
19 
stack, vent, or other outlet to a degree that will adequately dilute, reduce or eliminate 
the discharge of air contaminants to adjoining property. 
304 
LIMITATION - HYDROGEN SULFIDE: No person shall emit hydrogen sulfide from any 
location in such a manner or amount that the concentration of such emissions into 
the ambient air at any occupied place beyond the premises on which the source is 
located exceeds 0.03 parts per million by volume for any averaging period of 30 
minutes or more. 
305 
PERMIT CONDITIONS - HIGH SULFUR OIL: Any permit issued for the operation of an 
existing source, or any renewal or modification of such a permit, shall include a 
condition prohibiting the use of high sulfur oil by the permittee. The applicant must 
demonstrate to the Control Officer that sufficient quantities of low sulfur oil are not 
available for use by the source and that it has adequate facilities and contingency 
plans to insure that the sulfur dioxide ambient air quality standards set forth in Rule 
510 of these Regulations will not be violated. The terms of the permit may authorize 
the use of high sulfur oil under such conditions as are justified. In cases where the 
permittee is authorized to use high sulfur oil, it shall submit to the Control Officer 
monthly reports detailing its efforts to obtain low sulfur oil. When the conditions 
justifying the use of high sulfur oil no longer exist, the permit shall be modified 
accordingly. 
306 
LIMITATION - SULFUR FROM OTHER INDUSTRIES: No person shall discharge into 
the atmosphere from any industry, reduced sulfur, which includes sulfur equivalent 
from all sulfur emissions including but not limited to sulfur dioxide, sulfur trioxide and 
sulfuric acid, in excess of ten percent of the sulfur entering the process as feed. 
307 
OPERATING REQUIREMENTS – ASPHALT KETTLES AND DIP TANKS: 
307.1 No person shall operate an asphalt kettle or dip tank unless the owner or 
operator controls air contaminant emissions by good modern practices, 
including but not limited to: 
a. Maintenance of temperature below both the asphalt flash point and the 
maximum temperature recommended by the asphalt manufacturer 
through the use of automatic temperature controls. 
b. Operation of the kettle or dip tank with the lid closed except when charging. 
c. Pumping or drawing the asphalt through cocks without dipping. 
d. Firing of the kettle or dip tank with a clean burning fuel. 
e. Maintaining the kettle or dip tank in clean, properly adjusted and good 
operating condition. 
307.2 The visible emissions from the operation of an asphalt kettle or dip tank 
shall comply with the provisions of Rule 300. 
SECTION 400 – ADMINISTRATIVE REQUIREMENTS (NOT APPLICABLE) 
SECTION 500 – MONITORING AND RECORDS (NOT APPLICABLE)
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
20 
Revision to Arizona's SIP 
Sections 306 and 307 of Rule 320 of the 
MCAPCR 
Appendix 8: Clean Version of Sections 306 and 307 for 
Incorporation into SIP 
 
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320-1 
 
Revised 07/13/88 
Revised 07/02/03 
 
MARICOPA COUNTY 
AIR POLLUTION CONTROL REGULATIONS 
 
REGULATION III – CONTROL OF AIR CONTAMINANTS 
 
RULE 320 
ODORS AND GASEOUS AIR CONTAMINANTS 
 
 
306 
LIMITATION - SULFUR FROM OTHER INDUSTRIES: No person shall discharge 
into the atmosphere from any industry, reduced sulfur, which includes sulfur 
equivalent from all sulfur emissions including but not limited to sulfur dioxide, 
sulfur trioxide and sulfuric acid, in excess of ten percent of the sulfur entering the 
process as feed. 
 
307 
OPERATING REQUIREMENTS – ASPHALT KETTLES AND DIP TANKS: 
307.1 No person shall operate an asphalt kettle or dip tank unless the owner or 
operator controls air contaminant emissions by good modern practices, 
including but not limited to: 
a. Maintenance of temperature below both the asphalt flash point and 
the maximum temperature recommended by the asphalt 
manufacturer through the use of automatic temperature controls. 
b. Operation of the kettle or dip tank with the lid closed except when 
charging. 
c. Pumping or drawing the asphalt through cocks without dipping. 
d. Firing of the kettle or dip tank with a clean burning fuel. 
e. Maintaining the kettle or dip tank in clean, properly adjusted and good 
operating condition. 
 
307.2 The visible emissions from the operation of an asphalt kettle or dip 
tank shall comply with the provisions of Rule 300. 
 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
21 
Revision to Arizona's SIP 
Sections 306 and 307 of Rule 320 of the 
MCAPCR 
Appendix 9: Notice of Board of Supervisors’ Public Hearing 
and Affidavit of Publication for Rescission and Replacement 
of Paragraphs G and J of Rule 32 in the Arizona SIP 
(Pending Posting) 
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Maricopa County • Air Quality Department • Planning and Analysis Division • November 2023 
22 
Revision to Arizona's SIP 
Sections 306 and 307 of Rule 320 of the 
MCAPCR 
Appendix 10: Board of Supervisors’ Approval for Rescission 
and Replacement of Paragraphs G and J of Rule 32 in the 
Arizona SIP 
(Pending Approval) 
 
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Maricopa County 
Air Quality Department 
Planning and Analysis Division 
Maricopa.gov/AQ 
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