40392 Federal Register / Vol. 86, No. 142 / Wednesday, July 28, 2021 / Proposed Rules 

§ 165.T08–0531 Safety Zone; 

Monongahela, Mile 96.0 to Mile 97.0, 

Maidsville, WV. 

(a) Location. The following area is a 

safety zone: All navigable waters of the 

Monongahela River from mile 96.0 to 

mile 97.0. 

(b) Effective period. This section is 

effective from August 23, 2021 through 

August 25, 2021. 

(c) Regulations. (1) In accordance with 

the general regulations in § 165.23, entry 

of persons and vessels into this zone is 

prohibited unless authorized by the 

Captain of the Port Marine Safety Unit 

Pittsburgh (COTP) or a designated 

representative. 

(2) Persons or vessels requiring entry 

into or passage through the zone must 

request permission from the COTP 

Pittsburgh or a designated 

representative. The COTP’s 

representative may be contacted at 412– 

221–0807. 

(3) All persons and vessels shall 

comply with the instructions of the 

COTP Pittsburgh or a designated 

representative. Designated COTP 

representatives include United States 

Coast Guard commissioned, warrant, 

and petty officer. 

(d) Information broadcasts. The COTP 

Pittsburgh or a designated 

representative will inform the public 

through Local Notice to Mariners 

(LNMs), Broadcast Notices to Mariners 

(BNMs), and/or Marine Safety 

Information Bulletins (MSIBs), as 

appropriate. 

Dated: 22 July 2021. 

E.J. Velez, 

Commander, U.S. Coast Guard, Captain of 

the Port Marine Safety Unit Pittsburgh. 

[FR Doc. 2021–15928 Filed 7–27–21; 8:45 am] 

BILLING CODE 9110–04–P 

DEPARTMENT OF THE INTERIOR 

National Park Service 

36 CFR Parts 60 and 63 

[NPS–WASO–NHPA–32134; PPWONRADE2, 

PMP00EI05.YP0000] 

RIN 1024–AE49 

National Register of Historic Places; 

Withdrawal 

AGENCY: National Park Service; Interior. 

ACTION: Proposed rule; withdrawal. 

SUMMARY: The National Park Service 

withdraws the proposed rule that would 

have revised regulations governing the 

listing of properties in the National 

Register of Historic Places. The National 

Park Service no longer intends to 

prepare a final rule and has terminated 

the rulemaking process. 

DATES: The March 1, 2019 proposed rule 

(84 FR 6996) is withdrawn as of July 28, 

2021. 

FOR FURTHER INFORMATION CONTACT: Joy 

Beasley, Associate Director, Cultural 

Resources Partnerships and Science & 

Keeper of the National Register of 

Historic Places, NPS (WASO), (202) 

354–6991, joy_beasley@nps.gov. 

Shannon A. Estenoz, 

Assistant Secretary for Fish and Wildlife and 

Parks. 

[FR Doc. 2021–15944 Filed 7–27–21; 8:45 am] 

BILLING CODE 4312–52–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 52 

[EPA–R07–OAR–2019–0708; FRL–8711–01– 

R7] 

Air Plan Approval; Iowa; Polk County; 

State Implementation Plan 

AGENCY: Environmental Protection 

Agency (EPA). 

ACTION: Proposed rule. 

SUMMARY: The Environmental Protection 

Agency (EPA) is proposing to approve 

revisions to the Iowa State 

Implementation Plan (SIP) to include 

recent changes to the Polk County Board 

of Health Rules and Regulations in 

addition to revisions from past 

submittals. The proposed revisions 

update definitions and references to the 

effective dates of Federal rules approved 

into the State’s SIP, prohibit burning of 

demolished buildings, update references 

to methods and procedures for 

performance test/stack test and 

continuous monitoring systems, and 

revise permitting exemptions. These 

proposed revisions will not adversely 

impact air quality and will ensure 

consistency between the State and 

Federally approved rulemakings. 

DATES: Comments must be received on 

or before August 27, 2021. 

ADDRESSES: You may send comments, 

identified by Docket ID No. EPA–R07– 

OAR–2019–0708 to https://

www.regulations.gov. Follow the online 

instructions for submitting comments. 

Instructions: All submissions received 

must include the Docket ID No. for this 

rulemaking. Comments received will be 

posted without change to https://

www.regulations.gov/, including any 

personal information provided. For 

detailed instructions on sending 

comments and additional information 

on the rulemaking process, see the 

‘‘Written Comments’’ heading of the 

SUPPLEMENTARY INFORMATION section of 

this document. 

FOR FURTHER INFORMATION CONTACT: 

Stephanie Doolan, Environmental 

Protection Agency, Region 7 Office, Air 

Quality Planning Branch, 11201 Renner 

Boulevard, Lenexa, Kansas 66219; 

telephone number (913) 551–7719; 

email address doolan.stephanie@

epa.gov. 

SUPPLEMENTARY INFORMATION: 

Throughout this document ‘‘we,’’ ‘‘us,’’ 

and ‘‘our’’ refer to the EPA. 

Table of Contents 

I. Written Comments 

II. What is being addressed in this document? 

III. What SIP revisions are being proposed by 

the EPA? 

IV. Have the requirements for approval of a 

SIP been met? 

V. What actions are proposed? 

VI. Incorporation by Reference 

VII. Statutory and Executive Order Reviews 

I. Written Comments 

Submit your comments, identified by 

Docket ID No. EPA–R07–OAR–2019– 

0708 at https://www.regulations.gov. 

Once submitted, comments cannot be 

edited or removed from Regulations.gov. 

The EPA may publish any comment 

received to its public docket. Do not 

submit electronically any information 

you consider to be Confidential 

Business Information (CBI) or other 

information whose disclosure is 

restricted by statute. Multimedia 

submissions (audio, video, etc.) must be 

accompanied by a written comment. 

The written comment is considered the 

official comment and should include 

discussion of all points you wish to 

make. The EPA will generally not 

consider comments or comment 

contents located outside of the primary 

submission (i.e. on the web, cloud, or 

other file sharing system). For 

additional submission methods, the full 

EPA public comment policy, 

information about CBI or multimedia 

submissions, and general guidance on 

making effective comments, please visit 

https://www.epa.gov/dockets/ 

commenting-epa-dockets. 

II. What is being addressed in this 

document? 

The EPA is proposing to approve a 

submission from the State of Iowa to 

revise its SIP to incorporate recent 

updates to Chapter 10 of Polk County’s 

Code of Regulation pertaining to air 

quality. The Clean Air Act (CAA) allows 

authorized States to delegate portions of 

the Act’s implementation and 

enforcement to local governments such 


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as Polk County. The proposed revisions 

to the Iowa SIP incorporate Polk 

County’s updated definitions and 

references to the effective dates of 

Federal rules approved into the State’s 

SIP, update references to methods and 

procedures for performance test/stack 

test and continuous monitoring systems, 

prohibit burning of demolished 

buildings, and revise permitting 

exemptions. The proposed revisions to 

the Iowa SIP also include changes to 

Polk County’s public notice and 

participation requirements to allow 

permit modifications to be published 

online rather than in area newspapers 

which is consistent with recent 

revisions to Iowa’s SIP (83 FR 191, 

October 2, 2018). 

The EPA is not acting on portions of 

Polk County Chapter V that amend 

Standards for Marijuana Production and 

Marijuana Processing (section 5–21), 

Permits for New and Existing Stationary 

Sources, and Chapter 10–59, Permit 

Fees, that pertain to Prevention of 

Significant Deterioration (PSD) 

regulations because Iowa has not 

delegated the PSD program authority to 

Polk County. 

The EPA is also proposing to approve 

minor changes to the text of various 

ordinances that were previously 

submitted to the EPA, but were 

inadvertently omitted from previous 

actions. These revisions were contained 

in submittals dated December 3, 2007, 

September 1, 2009, September 19, 2011, 

April 15, 2014, and November 25, 2015. 

III. What SIP revisions are being 

proposed by the EPA? 

The EPA is proposing approval of the 

revisions to the Iowa SIP to incorporate 

revisions to Chapter V of the Polk 

County Board of Health Rules and 

Regulations listed below. A Technical 

Support Document (TSD) with a 

detailed description of the proposed 

revisions and the rationale for approval 

has been prepared by the EPA and is 

provided in the docket for this proposed 

action. 

Article I, In General. The proposed 

rule changes update the references to 

effective dates and definitions. The rule 

changes are administrative updates that 

do not negatively impact air quality and 

ensure greater consistency with the 

Iowa regulations. 

Article III, Incineration and Open 

Burning. Polk County amended this 

article to add a prohibition against 

burning demolished buildings. The 

addition of the prohibition on burning 

of demolished buildings will lead to 

reduced particulates and hazardous air 

pollutants (HAPs) thus improving air 

quality. 

Article VI, Emission Of Air 

Contaminants From Industrial 

Processes. Section 5–16 is being 

amended to include a general provision 

referencing paragraph (n) which applies 

to New Source Performance Standards 

(NSPS). NSPS is delegated by Iowa to 

Polk County but not SIP-approved by 

the EPA. The EPA proposes to approve 

the general provision because it pertains 

to a delegated authority. 

Article VII, Performance Test For 

Stack Emission Test. In section 5–18, 

paragraph (a)(2) the title and references 

to ‘‘stack sampling’’ are being revised to 

read ‘‘performance test (stack test)’’ and 

‘‘department’’ is being changed to read 

‘‘local program.’’ These minor changes 

in wording do not impact air quality. 

References to performance test methods 

and specifications and quality assurance 

procedures for performance evaluations 

of continuous monitoring systems are 

being updated to be consistent with the 

currently approved references in Iowa 

code. Thus, for consistency, the EPA is 

proposing to approve these updates. 

Article X, Permits, Division 1, 

Construction Permits. Section 5–28, 

Construction Permit Required, is being 

amended to add ‘‘Air Quality Division 

(AQD)’’ to the title. Subparagraphs (1) 

through (4) of paragraph (c) are not 

highlighted in Iowa’s SIP revision 

request as new text. After consulting 

with Iowa, the State submitted an 

Addendum dated July 21, 2020, to 

request EPA approval of paragraphs (1) 

though (4) of section 5–28 into the SIP, 

and stated that section 5–28 has been 

submitted to EPA for approval in the 

past. The text of these paragraphs is 

substantively similar to that of Iowa 

22.1 (455B) and 22.3 (b) which EPA has 

approved into Iowa’s SIP; thus, the EPA 

recommends approval of Paragraphs (a) 

through (c), including subparagraphs (1) 

through (4) of paragraph (c), to ensure 

consistency between Polk County’s and 

Iowa’s air permitting regulations. 

The title of article X, section 5–29, is 

being revised to add that the application 

is for a ‘‘construction’’ permit and the 

acronym ‘‘AQD.’’ The new title now 

reads ‘‘Application for a Construction 

Permit (AQD).’’ Also, this section is 

being revised to add a paragraph title, 

‘‘construction permit applications,’’ to 

revise ‘‘health officer’’ to now read 

‘‘local program,’’ to eliminate that the 

applications must be submitted ‘‘in 

duplicate,’’ and to add ‘‘applications’’ to 

the list of items to be submitted by 

entities seeking a construction permit. 

The EPA proposes to approve these 

changes into the Iowa SIP because they 

clarify the construction permitting 

process and reduce the number of hard 

copies that need to be submitted. 

Polk County has added the acronym 

‘‘AQD’’ representing the Air Quality 

Division to title X, sections 5–30, 

Processing of Applications for 

Construction Permits, section 5–31, 

Issuance of Construction Permits, and 

section 5–32, Denial of Permit. These 

additions represent minor clarifications. 

As such, the EPA proposes to approve 

them. 

The acronym ‘‘AQD’’ has also been 

added to title X, section 5–33, 

Exemptions from Permit Requirements. 

In item (50), Production Welding, 

‘‘stationary source’’ is replacing 

‘‘facility.’’ Further, the equations used to 

calculate the exemption in item (50) are 

being revised. The calculations make 

item (50) more stringent than 

calculations set forth in the welding 

exemption in the EPA-approved Iowa 

SIP, section 22.1(2)(ff)(1). 

Item (62) has been added to section 5– 

33. Item (62) exempts from construction 

permitting non-road diesel engines used 

for periodic testing and maintenance of 

natural gas compressor engines. The 

exemption is consistent with EPAapproved construction permitting 

requirements in Chapter 22.1(2) ‘‘oo’’ of 

the Iowa code. The EPA proposes to 

approve item (62) into the Iowa SIP as 

it makes Polk County’s authorities 

consistent with Iowa’s. 

Article X, Permits, Division 2, 

Operating Permits. ‘‘Annual Operating’’ 

is being added to the title of section 5– 

37 to clarify the type of permit to which 

the section pertains. The acronym 

‘‘AQD’’ is being added as well. The 

reference to ‘‘department’’ is being 

changed to ‘‘Local Program.’’ Also, this 

section is being updated to be consistent 

with Iowa code regarding public notice 

requirements. The State made revisions 

that address public participation 

requirements for its PSD permitting 

program to reflect updates to the Federal 

regulations, at 40 CFR part 51, subpart 

I, published October 18, 2016. The 

revision removes the requirements for 

advertisement in a newspaper of general 

circulation in each region in which the 

proposed source will be constructed and 

provides for posting of the public 

comment period on a website identified 

by the State. The language and intent of 

the revisions to the Polk County rules 

and regulations are consistent with the 

Federal regulations and the EPAapproved Iowa SIP. Thus, the EPA is 

proposing to approve these Polk County 

revisions into the Iowa SIP. 

The title for section 5–39 is being 

revised to clarify that the listed 

exemptions are for ‘‘Annual Operating’’ 

Permits. Revisions to item (43) update 

the language from ‘‘facility’’ to 

‘‘stationary source(s)’’ and correct the 


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40394 Federal Register / Vol. 86, No. 142 / Wednesday, July 28, 2021 / Proposed Rules 

equation for exemption from permitting 

for welding activities to agree with that 

in Iowa code. The EPA is proposing to 

approve these revisions because they 

clarify the permit exemptions. 

Items (56), Equipment related to 

research and development activities at a 

stationary source, (57), Exemptions for 

non-road diesel combustion engines, 

and item (58), fuel burning equipment 

for indirect heating or cooling with a 

capacity less than one million Btu per 

hour input when burning No. 1 or No. 

2 fuel oil, are consistent with previously 

approved exemptions in section 22.1(b) 

of the Iowa SIP. In paragraphs (57) and 

(58), Polk County has elected to be more 

stringent in its regulations than the 

EPA-approved Iowa code for similar 

operations. The EPA is proposing to 

approve items (56), (57) and (58) into 

the Iowa SIP. 

Section 5–39, paragraph (b) was not 

highlighted as new language in Iowa’s 

SIP revision request; however, following 

discussions with Iowa, the state 

indicated that this paragraph had been 

requested for approval in a previous 

submittal, and requested approval of 

this paragraph in its July 21, 2020, 

Addendum. This paragraph discusses 

exemptions from permitting for smaller 

liquified or natural gas fired heaters, 

residential wood or pellet heaters, cook 

stoves and fireplace, as well as jet 

engines, marine engines and 

locomotives. This paragraph is 

consistent with Iowa code section 22.1 

which is EPA-approved; thus, the EPA 

is proposing to approve the same Polk 

County exemptions. 

Revisions to sections 5–40, 5–42, 5–43 

and 5–44 are clarifications that the 

permits discussed are ‘‘Annual 

Operating’’ permits issued by AQD. The 

EPA is proposing to approve these 

minor editorial changes, as there is no 

impact to air quality. 

IV. Have the requirements for approval 

of a SIP been met? 

The submittals met the public notice 

requirements for SIP submissions in 

accordance with 40 CFR 51.102. The 

submission also satisfies the 

completeness criteria of 40 CFR part 51, 

appendix V. In addition, these proposed 

revisions meet the substantive SIP 

requirements of the CAA, including 

section 110 and implementing 

regulations. These proposed revisions 

are also consistent with applicable EPA 

requirements of title V of the CAA and 

40 CFR part 70. 

V. What actions are proposed? 

The EPA is proposing to approve 

revisions to the Iowa SIP to incorporate 

the revisions to chapter 5, Air Pollution, 

of the Polk County Board of Health 

Rules and Regulations. The proposed 

revisions clarify rules, make revisions 

and corrections, and rescind portions of 

rules no longer relevant to the air 

program. The EPA has determined that 

approval of these proposed revisions 

will not adversely impact air quality 

and will ensure consistency between the 

local, State and federally-approved 

rules, and will ensure Federal 

enforceability of the State’s revised air 

program rules. 

VI. Incorporation by Reference 

In this document, the EPA is 

proposing to include regulatory text in 

an EPA final rule that includes 

incorporation by reference. In 

accordance with requirements of 1 CFR 

51.5, the EPA is proposing to 

incorporate by reference the Iowa 

Regulations described in the proposed 

amendments to 40 CFR 52 set forth 

below. The EPA has made, and will 

continue to make, these materials 

generally available through 

www.regulations.gov and at the EPA 

Region 7 Office (please contact the 

person identified in the FOR FURTHER

INFORMATION CONTACT section of this 

preamble for more information). 

VII. Statutory and Executive Order 

Reviews 

Under the CAA, the Administrator is 

required to approve a SIP submission 

that complies with the provisions of the 

Act and applicable Federal regulations. 

42 U.S.C. 7410(k); 40 CFR 52.02(a). 

Thus, in reviewing SIP submissions, the 

EPA’s role is to approve state choices, 

provided that they meet the criteria of 

the CAA. Accordingly, this action 

merely approves state law as meeting 

Federal requirements and does not 

impose additional requirements beyond 

those imposed by state law. For that 

reason, this action: 

• Is not a significant regulatory action 

subject to review by the Office of 

Management and Budget under 

Executive Orders 12866 (58 FR 51735, 

October 4, 1993) and 13563 (76 FR 3821, 

January 21, 2011); 

• Is not an Executive Order 13771 (82 

FR 9339, February 2, 2017) regulatory 

action because SIP approvals are 

exempted under Executive Order 12866. 

• Does not impose an information 

collection burden under the provisions 

of the Paperwork Reduction Act (44 

U.S.C. 3501 et seq.); 

• Is certified as not having a 

significant economic impact on a 

substantial number of small entities 

under the Regulatory Flexibility Act (5 

U.S.C. 601 et seq.); 

• Does not contain any unfunded 

mandate or significantly or uniquely 

affect small governments, as described 

in the Unfunded Mandates Reform Act 

of 1995 (Pub. L. 104–4); 

• Does not have Federalism 

implications as specified in Executive 

Order 13132 (64 FR 43255, August 10, 

1999); 

• Is not an economically significant 

regulatory action based on health or 

safety risks subject to Executive Order 

13045 (62 FR 19885, April 23, 1997); 

• Is not a significant regulatory action 

subject to Executive Order 13211 (66 FR 

28355, May 22, 2001); 

• Is not subject to requirements of 

section 12(d) of the National 

Technology Transfer and Advancement 

Act of 1995 (15 U.S.C. 272 note) because 

application of those requirements would 

be inconsistent with the CAA; and 

• Does not provide EPA with the 

discretionary authority to address, as 

appropriate, disproportionate human 

health or environmental effects, using 

practicable and legally permissible 

methods, under Executive Order 12898 

(59 FR 7629, February 16, 1994). 

The SIP is not approved to apply on 

any Indian reservation land or in any 

other area where the EPA or an Indian 

tribe has demonstrated that a tribe has 

jurisdiction. In those areas of Indian 

country, the proposed rule does not 

have tribal implications and will not 

impose substantial direct costs on tribal 

governments or preempt tribal law as 

specified by Executive Order 13175 (65 

FR 67249, November 9, 2000). 

List of Subjects in 40 CFR Part 52 

Environmental protection, Air 

pollution control, Incorporation by 

reference, Intergovernmental relations, 

Particulate matter, Reporting and 

recordkeeping requirements, Volatile 

organic compounds. 

Dated: July 19, 2021. 

Edward H. Chu, 

Acting Regional Administrator, Region 7. 

For the reasons stated in the 

preamble, the EPA proposes to amend 

40 CFR part 52 as set forth below: 

PART 52—APPROVAL AND 

PROMULGATION OF 

IMPLEMENTATION PLANS 

■ 1. The authority citation for part 52 

continues to read as follows: 

Authority: 42 U.S.C. 7401 et seq. 

Subpart Q-Iowa 

■ 2. In § 52.820, the table in paragraph 

(c) is amended by revising the entry 

‘‘Chapter V’’ under the heading ‘‘Polk 

County’’ to read as follows: 


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§ 52.820 Identification of plan. 

* * * * * 

(c) * * * 

APPROVED IOWA REGULATIONS

Iowa 

citation Title State effective date EPA approval date Explanation 

Iowa Department of Natural Resources Environmental Protection Commission [567] 

*******

Polk County 

Chapter V ....... Polk County Board of Health 

Rules and Regulations Air 

Pollution Chapter V.

11/30/18 [Date of publication of the 

final rule in the Federal 

Register], [Federal Register citation of the final 

rule].

Article I, Section 5–2, definition of ‘‘anaerobic 

lagoon’’ and ‘‘variance;’’ Article III, Incineration and Open Burning, Section 5–7(d) 

Variance Application; Article VI, Sections 

5–16(n), (o) and (p); Article VIII; Article IX, 

Sections 5–27(3) and (4); Article X, Section 5–28, subsections (a) through (c), and 

Article X, Section 5–35(b)(5); Article XIII; 

Article XIV; and Article XVI, Section 5–75B 

are not part of the SIP. 

* * * * * * * 

* * * * * 

[FR Doc. 2021–15733 Filed 7–27–21; 8:45 am] 

BILLING CODE 6560–50–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 52 

[EPA–R07–OAR–2021–0405; FRL–8708–01– 

R7] 

Air Plan Approval; Approval of 

Missouri Air Quality Implementation 

Plans; Revisions to St. Louis 1997 

PM2.5 Maintenance Plan 

AGENCY: Environmental Protection 

Agency (EPA). 

ACTION: Proposed rule. 

SUMMARY: The Environmental Protection 

Agency (EPA) is proposing to approve a 

State Implementation Plan (SIP) 

revision submitted by the State of 

Missouri on November 12, 2019, 

revising the maintenance plan 

demonstrating continued maintenance 

of the 1997 PM2.5 National Ambient Air 

Quality Standards (NAAQS) in the St. 

Louis area. This revision states that the 

St. Louis area no longer needs to rely on 

the vehicle Inspection and Maintenance 

(I/M) program and the use of 

Reformulated Gasoline (RFG) for 

continued maintenance throughout the 

maintenance period for the 1997 PM2.5

NAAQS. EPA is proposing to determine 

that this revision meets the 

requirements of the Clean Air Act. 

DATES: Comments must be received on 

or before August 27, 2021. 

ADDRESSES: You may send comments, 

identified by Docket ID No. EPA–R07– 

OAR–2021–0405 to https://

www.regulations.gov. Follow the online 

instructions for submitting comments. 

Instructions: All submissions received 

must include the Docket ID No. for this 

rulemaking. Comments received will be 

posted without change to https://

www.regulations.gov/, including any 

personal information provided. For 

detailed instructions on sending 

comments and additional information 

on the rulemaking process, see the 

‘‘Written Comments’’ heading of the 

SUPPLEMENTARY INFORMATION section of 

this document. 

FOR FURTHER INFORMATION CONTACT: 

Steven Brown, Environmental 

Protection Agency, Region 7 Office, Air 

Quality Planning Branch, 11201 Renner 

Boulevard, Lenexa, Kansas 66219; 

telephone number: (913) 551–7718; 

email address: brown.steven@epa.gov. 

SUPPLEMENTARY INFORMATION: 

Throughout this document ‘‘we,’’ ‘‘us,’’ 

and ‘‘our’’ refer to the EPA. 

Table of Contents 

I. Written Comments 

II. What is being addressed in this document? 

III. Have the requirements for approval of a 

SIP revision been met? 

IV. What action is the EPA proposing to take? 

V. Statutory and Executive Order Reviews 

I. Written Comments 

Submit your comments, identified by 

Docket ID No. EPA–R07–OAR–2021– 

0405, at https://www.regulations.gov. 

Once submitted, comments cannot be 

edited or removed from Regulations.gov. 

The EPA may publish any comment 

received to its public docket. Do not 

submit electronically any information 

you consider to be Confidential 

Business Information (CBI) or other 

information whose disclosure is 

restricted by statute. Multimedia 

submissions (audio, video, etc.) must be 

accompanied by a written comment. 

The written comment is considered the 

official comment and should include 

discussion of all points you wish to 

make. The EPA will generally not 

consider comments or comment 

contents located outside of the primary 

submission (i.e., on the web, cloud, or 

other file sharing system). For 

additional submission methods, the full 

EPA public comment policy, 

information about CBI or multimedia 

submissions, and general guidance on 

making effective comments, please visit 

https://www.epa.gov/dockets/ 

commenting-epa-dockets. 

II. What is being addressed in this 

document? 

The EPA is proposing to approve SIP 

revisions submitted by the State of 

Missouri on November 12, 2019, 

revising the 1997 PM2.5 maintenance 

plan. This SIP revision demonstrates 

continued maintenance of the 1997 

PM2.5 NAAQS in the St. Louis area 

through the future year of 2025. The 

maintenance area boundary includes the 

Missouri counties of Franklin, Jefferson, 

St. Charles, and St. Louis along with the 

City of St. Louis. 

Through this action, the Missouri 

Department of Natural Resources 

(MoDNR) is requesting EPA to approve 


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