Federal Register / Vol. 86, No. 42 / Friday, March 5, 2021 / Proposed Rules 12889 

Protesters are asked to call or email the 

person listed in the FOR FURTHER

INFORMATION CONTACT section to 

coordinate protest activities so that your 

message can be received without 

jeopardizing the safety or security of 

people, places, or vessels. 

V. Public Participation and Request for 

Comments 

We view public participation as 

essential to effective rulemaking, and 

will consider all comments and material 

received during the comment period. 

Your comment can help shape the 

outcome of this rulemaking. If you 

submit a comment, please include the 

docket number for this rulemaking, 

indicate the specific section of this 

document to which each comment 

applies, and provide a reason for each 

suggestion or recommendation. 

We encourage you to submit 

comments through the Federal 

eRulemaking Portal at https://

www.regulations.gov. If your material 

cannot be submitted using https://

www.regulations.gov, call or email the 

person in the FOR FURTHER INFORMATION

CONTACT section of this document for 

alternate instructions. 

We accept anonymous comments. All 

comments received will be posted 

without change to https://

www.regulations.gov and will include 

any personal information you have 

provided. For more about privacy and 

submissions in response to this 

document, see DHS’s eRulemaking 

System of Records notice (85 FR 14226, 

March 11, 2020). 

Documents mentioned in this NPRM 

as being available in the docket, and all 

public comments, will be in our online 

docket at https://www.regulations.gov 

and can be viewed by following that 

website’s instructions. Additionally, if 

you go to the online docket and sign up 

for email alerts, you will be notified 

when comments are posted or a final 

rule is published. 

List of Subjects in 33 CFR Part 165 

Harbors, Marine safety, Navigation 

(water), Reporting and recordkeeping 

requirements, Security measures, 

Waterways. 

For the reasons discussed in the 

preamble, the Coast Guard amends 33 

CFR part 165 as follows: 

PART 165—REGULATED NAVIGATION 

AREAS AND LIMITED ACCESS AREAS 

■ 1. The authority citation for part 165 

continues to read as follows: 

Authority: 46 U.S.C. 70034, 70051; 33 CFR 

1.05–1, 6.04–1, 6.04–6, and 160.5; 

Department of Homeland Security Delegation 

No. 0170.1 

■ 2. Add § 165.T09–0083 to read as 

follows: 

§ 165.T09–0035 Safety Zone; Blasting 

Project; Menominee River, Marinette, WI. 

(a) Location. All navigable waters of 

the Menominee River within 1000 feet 

of the blast area on the southern bank 

of the river at coordinates 

43.0705000°N, 086.2346667°. 

(b) Enforcement Period. The safety 

zone portion of the regulated area 

described in paragraph (a) of this 

section is effective for 15 minutes 

between 3:30 p.m. and 5:30 p.m. each 

evening from April 1 to November 30, 

2021. The part of the safety zone 

between the construction barges and the 

southern bank of the river, and the nowake zone portion of the regulated area 

described in paragraph (a) of this 

section will be in effect continuously 

from April 1 to November 30, 2021. 

(c) Regulations. 

(1) In accordance with the general 

regulations in section § 165.23, entry 

into, transiting, or anchoring within this 

safety zone is prohibited unless 

authorized by the Captain of the Port 

Lake Michigan (COTP) or a designated 

representative. 

(2) This safety zone is closed to all 

vessel traffic, except as may be 

permitted by the COTP or a designated 

representative. 

(3) The ‘‘designated representative’’ of 

the COTP is any Coast Guard 

commissioned, warrant, or petty officer 

who has been designated by the COTP 

to act on his or her behalf. 

(4) Persons and vessel operators 

desiring to enter or operate within the 

safety zone during blasting operations, 

or at speeds that would create a wake, 

must contact the COTP or an on-scene 

representative to obtain permission to 

do so. The COTP or an on-scene 

representative may be contacted via 

VHF Channel 16. Vessel operators given 

permission to enter or operate in the 

safety zone must comply with all 

directions given to them by the COTP or 

an on-scene representative. 

Dated: March 1, 2021. 

D.P. Montoro, 

Captain, U.S. Coast Guard, Captain of the 

Port Lake Michigan. 

[FR Doc. 2021–04553 Filed 3–4–21; 8:45 am] 

BILLING CODE 9110–04–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 52 

[EPA–R09–OAR –2021–0134; FRL–10020– 

93-Region 9] 

Air Plan Approval; Arizona; Pinal 

County Air Quality Control District 

AGENCY: Environmental Protection 

Agency (EPA). 

ACTION: Proposed rule. 

SUMMARY: The Environmental Protection 

Agency (EPA) is proposing to approve 

revisions to the Pinal County Air 

Quality Control District (PCAQCD or 

District) portion of the Arizona State 

Implementation Plan (SIP). These 

revisions concern the District’s negative 

declarations for the 2008 8-hour ozone 

National Ambient Air Quality Standards 

(NAAQS or ‘‘standards’’) in the portion 

of the Phoenix-Mesa ozone 

nonattainment area under the 

jurisdiction of the PCAQCD and two 

volatile organic compound (VOC) rules 

covering gasoline dispensing and 

surface coating operations. We are 

proposing to approve local rules to 

regulate these emission sources under 

the Clean Air Act (CAA or the Act). We 

are taking comments on this proposal 

and plan to follow with a final action. 

DATES: Comments must be received on 

or before April 5, 2021. 

ADDRESSES: Submit your comments, 

identified by Docket ID No. EPA–R09– 

OAR–2021–0134 at https://

www.regulations.gov. For comments 

submitted at Regulations.gov, follow the 

online instructions for submitting 

comments. 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, please 

contact the person identified in the FOR

FURTHER INFORMATION CONTACT section. 

For the full EPA public comment policy, 

information about CBI or multimedia 

submissions, and general guidance on 

making effective comments, please visit 


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12890 Federal Register / Vol. 86, No. 42 / Friday, March 5, 2021 / Proposed Rules 

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

commenting-epa-dockets. If you need 

assistance in a language other than 

English or if you are a person with 

disabilities who needs a reasonable 

accommodation at no cost to you, please 

contact the person identified in the FOR

FURTHER INFORMATION CONTACT section. 

FOR FURTHER INFORMATION CONTACT: 

Nicole Law, EPA Region IX, 75 

Hawthorne St., San Francisco, CA 

94105. By phone: (415) 947–4216 or by 

email at Law.Nicole@epa.gov. 

SUPPLEMENTARY INFORMATION: 

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

and ‘‘our’’ refer to the EPA. 

Table of Contents 

I. The State’s Submittal 

A. What documents did the State submit? 

B. Are there other versions of these 

documents? 

C. What is the purpose of the submitted 

documents? 

II. The EPA’s Evaluation and Action 

A. How is the EPA evaluating the 

submitted documents? 

B. Do the documents meet the evaluation 

criteria? 

C. The EPA’s Recommendations to Further 

Improve the Submitted Rules 

D. Public Comment and Proposed Action 

III. Incorporation by Reference 

IV. Statutory and Executive Order Reviews 

I. The State’s Submittal 

A. What documents did the State 

submit? 

Table 1 lists the documents addressed 

by this proposal with the dates that they 

were amended by the local air agency 

and submitted by the Arizona 

Department of Environmental Quality 

(ADEQ). 

TABLE 1—SUBMITTED DOCUMENTS

Local agency Rule title Amended Submitted 

PCAQCD .......... Reasonably Available Control Technology (RACT) Analysis, Negative Declaration and 

Rules Adoption—Appendix B: Additional Negative Declarations.

8/5/2020 8/20/2020 

PCAQCD .......... Chapter 5, Article 13 Surface Coating Operations ...................................................................

5–13–100, ‘‘General’’ ................................................................................................................

5–13–200, ‘‘Definitions’’ ............................................................................................................

5–13–300, ‘‘Standards’’ ............................................................................................................

5–13–400, ‘‘Administrative Requirements’’ ..............................................................................

5–13–500, ‘‘Monitoring and Records’’ ......................................................................................

8/5/2020 8/20/2020 

PCAQCD .......... Chapter 5, Article 20 Storage and Loading of Gasoline at Gasoline Dispensing Facilities ....

5–20–100 ‘‘General’’ .................................................................................................................

5–20–200 ‘‘Definitions’’ .............................................................................................................

5–20–300 ‘‘Standards’’ .............................................................................................................

5–20–400 ‘‘Administrative Requirements’’ ...............................................................................

5–20–500 ‘‘Monitoring and Records’’ .......................................................................................

8/5/2020 8/20/2020 

On September 14, 2020, the EPA 

determined that the submittal for 

PCAQCD’s negative declarations and 

two rules met the completeness criteria 

in 40 CFR part 51 Appendix V, which 

must be met before formal EPA review. 

B. Are there other versions of these 

documents? 

We approved earlier versions of the 

two rules, Article 13 Surface Coating 

Operations and Article 20 Storage and 

Loading of Gasoline at Gasoline 

Dispensing Facilities, into the SIP on 

August 9, 2019 (84 FR 39196). The 

PCAQCD adopted revisions to the SIPapproved version on August 5, 2020, 

and ADEQ submitted them to us on 

August 20, 2020. If we take final action 

to approve the August 5, 2020 versions 

of the two rules, these versions will 

replace the previously approved 

versions of these rules in the SIP. 

We approved portions of the RACT 

SIP and negative declarations on August 

9, 2019 (84 FR 39196). The PCAQCD 

adopted additional negative 

declarations on August 5, 2020, and 

ADEQ submitted them to us on August 

20, 2020. 

C. What is the purpose of the submitted 

documents? 

Emissions of VOCs and oxides of 

nitrogen (NOX) contribute to the 

production of ground-level ozone, smog 

and particulate matter (PM), which 

harm human health and the 

environment. Section 110(a) of the CAA 

requires states to submit regulations that 

control VOC and NOX emissions. 

Sections 182(b)(2) and (f) require that 

SIPs for ozone nonattainment areas 

classified as Moderate or above 

implement RACT for any source 

covered by a Control Techniques 

Guidelines (CTG) document and for any 

major source of VOCs or NOX. The 

PCAQCD is subject to this requirement 

as it regulates the Pinal County portion 

of the Phoenix-Mesa ozone 

nonattainment area that is currently 

designated and classified as a Moderate 

nonattainment area for the 2008 8-hour 

ozone NAAQS. Therefore, the PCAQCD 

must, at a minimum, adopt RACT-level 

controls for all sources covered by a 

CTG document and for all major nonCTG sources of VOCs or NOX within the 

ozone nonattainment area that it 

regulates. Any stationary source that 

emits or has the potential to emit at least 

100 tons per year (tpy) of VOCs or NOX

is a major stationary source in a 

Moderate ozone nonattainment area 

(CAA section 182(b)(2), (f) and 302(j)). 

Section III.D of the preamble to the 

EPA’s final rule to implement the 2008 

ozone NAAQS (80 FR 12264, March 6, 

2015) discusses RACT requirements. It 

states in part that RACT SIPs must 

contain adopted RACT regulations, 

certifications where appropriate that 

existing provisions are RACT, and/or 

negative declarations that no sources in 

the nonattainment area are covered by a 

specific CTG. Id. at 12278. It also 

provides that states must submit 

appropriate supporting information for 

their RACT submissions as described in 

the EPA’s implementation rule for the 

1997 ozone NAAQS. See Id. and 70 FR 

71612, 71652 (November 29, 2005). The 

submitted negative declarations provide 

PCAQCD’s analyses of its compliance 

with the CAA section 182 RACT 

requirements for the 2008 8-hour ozone 

NAAQS. PCAQCD also adopted and 

submitted for SIP approval the 

following two rules. 

Chapter 5, Article 13 is a rule that 

establishes VOC content limits for 

surface coating operations in the Pinal 

County portion of the Phoenix-Mesa 8- 

hour ozone nonattainment area. It 

contains: Definitions; VOC content 

limits; various partial exemptions; 

requirements for coating application 


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Federal Register / Vol. 86, No. 42 / Friday, March 5, 2021 / Proposed Rules 12891 

1 57 FR 13498, 13512 (April 16, 1992). 

methods, cleanup of application 

equipment, work practices for the 

handling, disposal, and storage of VOC 

containing materials, and emission 

control systems; and requirements for 

monitoring, testing, and recordkeeping. 

Chapter 5, Article 20 is a rule that 

establishes limits for VOC emissions 

from gasoline during storage and 

loading of gasoline at gasoline 

dispensing facilities. It contains: 

Definitions; various exemptions; 

requirements for vapor recovery 

equipment, general housekeeping, 

gasoline storage equipment, and 

gasoline loading operations; and 

requirements for monitoring, testing, 

and recordkeeping. 

EPA’s technical support documents 

(TSDs) have more information about the 

District’s negative declarations, rules, 

and the EPA’s evaluations thereof. 

II. The EPA’s Evaluation and Action 

A. How is the EPA evaluating the 

submitted documents? 

SIP rules must require RACT for each 

category of sources covered by a CTG 

document as well as each major source 

of VOCs or NOX in ozone nonattainment 

areas classified as Moderate or above 

(CAA section 182(b)(2)). The PCAQCD 

regulates a Moderate ozone 

nonattainment area (40 CFR 81.303) so 

the District’s rules must implement 

RACT. 

States must submit for SIP approval 

negative declarations for those source 

categories for which they have not 

adopted CTG-based regulations (because 

they have no sources above the CTGrecommended applicability threshold) 

regardless of whether such negative 

declarations were made for an earlier 

SIP.1 To do so, the submittal should 

provide reasonable assurance that no 

sources subject to the CTG requirements 

currently exist in the portion of the 

ozone nonattainment area that is 

regulated by the PCAQCD. 

The District’s analysis must 

demonstrate that each major source of 

VOCs or NOX in the ozone 

nonattainment area is covered by a 

RACT-level rule, or submit a negative 

declaration that no such sources exist in 

the part of the nonattainment area that 

is within the District. In addition, for 

each CTG source category, the District 

must either demonstrate that a RACTlevel rule is in place, or submit a 

negative declaration. Guidance and 

policy documents that we use to 

evaluate CAA section 182 RACT 

requirements include the following: 

1. ‘‘State Implementation Plans; General 

Preamble for the Implementation of Title I of 

the Clean Air Act Amendments of 1990,’’ 57 

FR 13498 (April 16, 1992); 57 FR 18070 

(April 28, 1992). 

2. EPA Office of Air Quality Planning and 

Standards, ‘‘Issues Relating to VOC 

Regulation Cutpoints, Deficiencies, and 

Deviations,’’ May 25, 1988 (‘‘the Bluebook,’’ 

revised January 11, 1990). 

3. EPA Region IX, ‘‘Guidance Document for 

Correcting Common VOC & Other Rule 

Deficiencies,’’ August 21, 2001 (‘‘the Little 

Bluebook’’). 

4. ‘‘State Implementation Plans; Nitrogen 

Oxides Supplement to the General Preamble; 

Clean Air Act Amendments of 1990 

Implementation of Title I; Proposed Rule,’’ 

(the NOX Supplement), 57 FR 55620, 

(November 25, 1992). 

5. Memorandum dated May 18, 2006, from 

William T. Harnett, Director, Air Quality 

Policy Division, to Regional Air Division 

Directors, Subject: ‘‘RACT Qs & As— 

Reasonably Available Control Technology 

(RACT): Questions and Answers.’’ 

6. ‘‘Final Rule to Implement the 8-hour 

Ozone National Ambient Air Quality 

Standard—Phase 2,’’ 70 FR 71612 (November 

29, 2005). 

7. ‘‘Implementation of the 2008 National 

Ambient Air Quality Standards for Ozone: 

State Implementation Plan Requirements,’’ 

80 FR 12264 (March 6, 2015). 

Rules that are submitted for inclusion 

into the SIP must be enforceable (CAA 

section 110(a)(2)), must not interfere 

with applicable requirements 

concerning attainment and reasonable 

further progress or other CAA 

requirements (CAA section 110(l)), and 

must not modify certain SIP control 

requirements in nonattainment areas 

without ensuring equivalent or greater 

emissions reductions (CAA section 193). 

In addition to the documents listed 

above, guidance and policy documents 

that we use to evaluate enforceability, 

stringency, and revision/relaxation 

requirements include the following: 

1. ‘‘Design Criteria for Stage I Vapor 

Control Systems—Gasoline Service 

Stations,’’ EPA–450/R–75–102, 

November 1975. 

2. ‘‘Control of Volatile Organic 

Emissions from Existing Stationary 

Sources—Volume VI: Surface Coating of 

Miscellaneous Metal Parts and 

Products,’’ EPA–450/2–78–015, June 

1978. 

3. ‘‘Control Techniques Guidelines for 

Miscellaneous Metal and Plastic Parts 

Coatings,’’ EPA 453/R–08–003, 

September 2008. 

4. ‘‘Model Volatile Organic 

Compound Rules for Reasonably 

Available Control Technology,’’ June 

1992. 

5. Memorandum dated March 17, 

2011, from Scott Mathias, Interim 

Director, Air Quality Policy Division, 

U.S. EPA to Regional Air Division 

Directors, Subject: ‘‘Approving SIP 

Revisions Addressing VOC RACT 

Requirements for Certain Coatings 

Categories.’’ 

B. Do the documents meet the 

evaluation criteria? 

These rules meet CAA requirements 

and are consistent with relevant 

guidance regarding enforceability, 

RACT, and SIP revisions. After 

reviewing PCAQCD’s list of Title V 

permitted facilities, we have also 

determined the negative declarations 

adopted by PCAQCD are correct. The 

TSDs have more information on our 

evaluation. 

C. The EPA’s Recommendations to 

Further Improve the Submitted Rules 

The TSDs include recommendations 

for the next time the local agency 

modifies the rules. 

D. Public Comment and Proposed 

Action 

As authorized in section 110(k)(3) of 

the Act, the EPA proposes to fully 

approve the submitted rules and 

negative declarations because they 

fulfill all relevant requirements. We will 

accept comments from the public on 

this proposal until April 5, 2021. If we 

take final action to approve the 

submitted rules and negative 

declarations, our final action will 

incorporate these rules into the federally 

enforceable SIP. Our final approval of 

the submitted rules and negative 

declarations would correct all of the 

deficiencies identified in our August 9, 

2019 partial approval, partial 

disapproval and limited approval, 

limited disapproval of PCAQCD’s RACT 

SIP submittal for the 2008 8-hour ozone 

NAAQS (84 FR 39196). 

III. Incorporation by Reference 

In this rule, the EPA is proposing to 

include in a final EPA rule regulatory 

text that includes incorporation by 

reference. In accordance with 

requirements of 1 CFR 51.5, the EPA is 

proposing to incorporate by reference 

the two PCAQCD rules described in 

Table 1 of this preamble. The EPA has 

made, and will continue to make, these 

materials available through https://

www.regulations.gov and at the EPA 

Region IX Office (please contact the 

person identified in the FOR FURTHER

INFORMATION CONTACT section of this 

preamble for more information). 

IV. Statutory and Executive Order 

Reviews 

Under the Clean Air Act, the 

Administrator is required to approve a 

SIP submission that complies with the 


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12892 Federal Register / Vol. 86, No. 42 / Friday, March 5, 2021 / Proposed Rules 

1On February 25, 2019 (effective April 17, 2019), 

based on a review of the full body of currently 

available scientific evidence and exposure/risk 

information, EPA issued a decision to retain the 

existing NAAQS for SO2. See 84 FR 9866. 

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 Clean Air 

Act. Accordingly, this proposed action 

merely proposes to approve state law as 

meeting federal requirements and does 

not impose additional requirements 

beyond those imposed by state law. For 

that reason, this proposed 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); 

• 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 Clean Air Act; 

and 

• Does not provide the EPA with the 

discretionary authority to address 

disproportionate human health or 

environmental effects with practical, 

appropriate, and legally permissible 

methods under Executive Order 12898 

(59 FR 7629, February 16, 1994). 

In addition, 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 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, 

Nitrogen dioxide, Ozone, Reporting and 

recordkeeping requirements, Volatile 

organic compounds. 

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

Dated: February 23, 2021. 

Deborah Jordan, 

Acting Regional Administrator, Region IX. 

[FR Doc. 2021–04387 Filed 3–4–21; 8:45 am] 

BILLING CODE 6560–50–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 81 

[EPA–R04–OAR–2020–0482; FRL–10019– 

57–Region 4] 

Air Plan Approval; TN: Redesignation 

of the Sumner County 2010 Sulfur 

Dioxide Unclassifiable Area 

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 

Tennessee, through the Tennessee 

Department of Environment and 

Conservation (TDEC), on September 29, 

2020, to redesignate the Sumner County, 

Tennessee unclassifiable area 

(hereinafter referred to as the ‘‘Sumner 

County Area’’ or ‘‘Area’’) to attainment/ 

unclassifiable for the 2010 1-hour 

primary sulfur dioxide (SO2) national 

ambient air quality standard (hereinafter 

referred to as the ‘‘2010 SO2 1-hour 

NAAQS’’). EPA now has sufficient 

information to determine that the 

Sumner County Area is attaining the 

2010 1-hour SO2 NAAQS and, therefore, 

is proposing to approve the State’s 

request and redesignate the Area to 

attainment/unclassifiable for the 2010 1- 

hour SO2 NAAQS. 

DATES: Comments must be received on 

or before April 5, 2021. 

ADDRESSES: Submit your comments, 

identified by Docket ID No. EPA–R04– 

OAR–2020–0482 at http://

www.regulations.gov. Follow the online 

instructions for submitting comments. 

Once submitted, comments cannot be 

edited or removed from Regulations.gov. 

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. 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 

http://www2.epa.gov/dockets/ 

commenting-epa-dockets. 

FOR FURTHER INFORMATION CONTACT: 

Evan Adams, Air Regulatory 

Management Section, Air Planning and 

Implementation Branch, Air and 

Radiation Division, U.S. Environmental 

Protection Agency, Region 4, 61 Forsyth 

Street SW, Atlanta, Georgia 30303–8960. 

Mr. Adams can be reached by telephone 

at (404) 562–9009 or via electronic mail 

at adams.evan@epa.gov. 

SUPPLEMENTARY INFORMATION: 

I. Background 

The Clean Air Act (CAA or Act) 

establishes a process for air quality 

management through the establishment 

and implementation of the national 

ambient air quality standards (NAAQS). 

On June 2, 2010, EPA revised the 

primary SO2 NAAQS, establishing a 

new 1-hour SO2 standard of 75 parts per 

billion (ppb). See 75 FR 35520 (June 22, 

2010).1 After the promulgation of a new 

or revised NAAQS, EPA is required to 

designate all areas of the country, 

pursuant to section 107(d)(1)–(2) of the 

CAA. For the 2010 1-hour SO2 NAAQS, 

designations were based on EPA’s 

application of the nationwide analytical 

approach to, and technical assessment 

of, the weight of evidence for each area, 

including but not limited to available air 

quality monitoring data and air quality 

modeling results. In advance of 

designating the Sumner County Area, 

EPA issued updated designations 

guidance through a March 20, 2015, 

memorandum from Stephen D. Page, 

Director, U.S. EPA, Office of Air Quality 

Planning and Standards, to Air Division 

Directors, U.S. EPA Regions 1–10 titled, 

‘‘Updated Guidance for Area 

Designations for the 2010 Primary 

Sulfur Dioxide National Ambient Air 

Quality Standard,’’ which contained the 


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