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 6560-50-P 

ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 51, 52, 70, and 71 

[EPA-HQ-OAR-2013-0685; FRL-9931-97-OAR] 

RIN 2060-AS06

Source Determination for Certain Emission Units in the Oil and Natural Gas Sector 

AGENCY: Environmental Protection Agency (EPA). 

ACTION: Proposed rule. 

SUMMARY: The U.S. Environmental Protection Agency (EPA) is proposing to clarify the term 

“adjacent” in the definitions of: (1) “building, structure, facility or installation” used to determine 

the “stationary source” for purposes of the Prevention of Significant Deterioration (PSD) and

Nonattainment New Source Review (NNSR) programs and (2) “major source” in the title V

program as applied to the oil and gas natural sector. The EPA has previously issued guidance on 

how to assess “adjacency” for this industry, but the use of the guidance has been challenged, 

resulting in uncertainty for the regulated community and for permitting authorities. The EPA is 

proposing to clarify how properties in the oil and natural gas sector are determined to be adjacent 

in order to assist permitting authorities and permit applicants in making consistent source 

determinations for this sector. In this action, the EPA is proposing two options for determining 

whether two or more properties in the oil and natural gas sector are “adjacent” for purposes of 

defining the “stationary source” in the PSD and NNSR programs, and “major source” for the title 

V program (referred to collectively as “source”). The preferred option would define “adjacent” 

for the oil and natural gas sector in terms of proximity. The EPA is co-proposing and taking 
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comment on an alternative option to define “adjacent” in terms of proximity or functional 

interrelatedness. 

DATES: Comments. Comments must be received on or before [INSERT DATE 60 DAYS 

AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. 

Public Hearing. The public hearing will be held on September 23, 2015, in Denver, Colorado. 

Please refer to SUPPLEMENTARY INFORMATION for additional information on the 

comment period and the public hearing. 

ADDRESSES: Comments. Submit your comments, identified by Docket ID No. EPA-HQ-OAR2013-0685, to the Federal eRulemaking Portal: http://www.regulations.gov. Follow the online 

instructions for submitting comments. Once submitted, comments cannot be edited or 

withdrawn. 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. If you need to include CBI as part of 

your comment, please visit http://www.epa.gov/dockets/comments.html for instructions. 

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. For additional submission methods, the full EPA public comment policy, and 

general guidance on making effective comments, please visit 

http://www.epa.gov/dockets/comments.html. For additional instructions on submitting comments, 

go to the SUPPLEMENTARY INFORMATION section of this document. 

Public Hearing. The September 23, 2015, public hearing will be held at the EPA, Region 8, 2nd

Floor, 1595 Wynkoop Street, Denver, CO 80202. Identification is required. If your driver’s 

license is issued by American Samoa, Louisiana, Minnesota, New Hampshire and New York, 
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you must present an additional form of identification to enter (see SUPPLEMENTARY 

INFORMATION for additional information on this location).

FOR FURTHER INFORMATION CONTACT: For further general information on this 

rulemaking, contact Ms. Cheryl Vetter, Office of Air Quality Planning and Standards (C504-03), 

U.S. Environmental Protection Agency, by phone at (919) 54l-4391, or by email at 

vetter.cheryl@epa.gov. 

For information related to the public hearing, please contact Aimee St. Clair, Office of 

Air Quality Planning and Standards (E143-03), U.S. Environmental Protection Agency, by 

phone at (919) 541-1063, or by email at StClair.Aimee@epa.gov. To register to speak at the 

public hearing, please use the online registration form available at:

http://www.epa.gov/airquality/oilandgas/, no later than September 18, 2015. 

SUPPLEMENTARY INFORMATION: 

I. General Information 

A. Does this proposal apply to me? 

Entities potentially affected directly by this proposal include owners and operators of 

sources of new and modified oil and gas sector operations. Such entities are expected to be in the 

groups indicated below. In addition, state, local and tribal governments may be affected by the 

rule if they update state rules to adopt these changes. 
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Industry Group NAICS Code1

Oil and Gas Extraction 21111 

Crude Petroleum and Natural Gas Extraction 211111 

Natural Gas Liquid Extraction 211112 

Drilling Oil and Gas Wells 213111 

Support Activities for Oil and Gas 213112 

Natural Gas Distribution 221210 

Pipeline Distribution of Crude Oil 486110 

Pipeline Distribution of Natural Gas 486210 

Federal Government May Be Affected

State/Local/Tribal Government May Be Affected

B. What should I consider as I prepare my comments for the EPA? 

When submitting comments, remember to: 

• Identify the rulemaking by docket number and other identifying information (subject 

heading, Federal Register date and page number). 

• Follow directions - The agency may ask you to respond to specific questions or organize 

comments by referencing a Code of Federal Regulations (CFR) part or section number. 

• Explain why you agree or disagree; suggest alternatives and substitute language for your 

requested changes.

• Describe any assumptions and provide any technical information and/or data that you used. 

 

1 North American Industry Classification System (NAICS)
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• If you estimate potential costs or burdens, explain how you arrived at your estimate in 

sufficient detail to allow for it to be reproduced. 

• Provide specific examples to illustrate your concerns, and suggest alternatives. 

• Explain your views as clearly as possible, avoiding the use of profanity or personal threats. 

• Make sure to submit your comments by the comment period deadline identified. 

C. Where can I get a copy of this document and other related information? 

 In addition to being available in the docket, an electronic copy of this action will be 

posted at http://www.epa.gov/nsr/index.htm.

D. What should I know about a possible public hearing? 

The September 23, 2015, public hearing will be held to accept oral comments on the 

proposed rulemaking. The hearing will be held at the EPA, Region 8, 2nd Floor, 1595 Wynkoop 

Street, Denver, CO 80202. The hearing will begin at 9:00 a.m. and will conclude at 8:00 p.m. To 

register to speak at the hearing, please use the online registration form available at: 

http://www.epa.gov/airquality/oilandgas/. For questions regarding registration, please contact 

Aimee St. Clair at (919) 541-1063. The last day to pre-register to speak at the hearing will be 

September 18, 2015. Additionally, requests to speak will be taken the day of the hearing at the 

hearing registration desk, although preferences on speaking times may not be able to be fulfilled. 

Please note that registration requests received before the hearing will be confirmed by the EPA 

via email. We cannot guarantee that we can accommodate all timing requests and will provide 

requestors with the next available speaking time, in the event that their requested time is taken. 

Please note that the time outlined in the confirmation email received will be the time the one will 

be scheduled to speak. Again, depending on the flow of the day, times may fluctuate. If you 

require the service of a translator or special accommodations such as audio description, we ask 
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that you pre-register for the hearing by September 18, 2015, as we may not be able to arrange 

such accommodations without advance notice. Please note that any updates made to any aspect 

of the hearing will be posted online at http://www.epa.gov/airquality/oilandgas/. While the EPA 

expects the hearing to go forward as set forth above, we ask that you monitor our website or 

contact Aimee St.Clair at (919) 541-1063 to determine if there are any updates to the information 

on the hearing. The EPA does not intend to publish a notice in the Federal Register announcing 

any such updates. 

Oral testimony will be limited to 5 minutes for each commenter. The EPA encourages 

commenters to provide the EPA with a copy of their oral testimony electronically (via email) 

before the hearing and in hard copy form at the hearing. 

The hearing will provide interested parties the opportunity to present data, views, or 

arguments concerning the proposed action. The EPA will make every effort to accommodate all 

speakers who wish to register to speak at the hearing venue on the day of the hearing. The EPA 

may ask clarifying questions during the oral presentations, but will not respond to the 

presentations at that time. Written statements and supporting information submitted during the 

comment period will be considered with the same weight as oral comments and supporting 

information presented at the public hearing. Verbatim transcripts of the hearing and written 

statements will be included in the docket for the rulemaking. The EPA plans for the hearing to 

run on schedule; however, due to on-site schedule fluctuations, actual speaking times may shift 

slightly. 

Because this hearing is being held at United States (U.S.) government facilities, 

individuals planning to attend the hearing should be prepared to show valid picture identification 

to the security staff in order to gain access to the meeting room. Please note that the REAL ID 
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Act, passed by Congress in 2005, established new requirements for entering federal facilities. If 

your driver’s license is issued by American Samoa, Louisiana, Minnesota, New Hampshire or 

New York, you must present an additional form of identification to enter the federal building. 

Acceptable alternative forms of identification include: federal employee badges, passports, 

enhanced driver’s licenses, and military identification cards. For additional information for the 

status of your state regarding REAL ID, go to http://www.dhs.gov/real-id-enforcement-brief. In 

addition, you will need to obtain a property pass for any personal belongings you bring with you. 

Upon leaving the building, you will be required to return this property pass to the security desk. 

No large signs will be allowed in the building, cameras may only be used outside of the building, 

and demonstrations will not be allowed on federal property for security reasons. 

Attendees will be asked to go through metal detectors. To help facilitate this process, 

please be advised that you will be asked to remove all items from all pockets and place them in 

provided bins for screening; remove laptops, phones, or other electronic devices from their 

carrying case and place in provided bins for screening; avoid shoes with metal shanks, toe 

guards, or supports as a part of their construction; remove any metal belts, metal belt buckles, 

large jewelry, watches, and follow the instructions of the guard if identified for secondary 

screening. Additionally, no weapons (e.g., pocket knives) or drugs or drug paraphernalia (e.g., 

marijuana) will be allowed in the building. We recommend that you arrive 20 minutes in advance 

of your speaking time to allow time to go through security and to check in with the registration 

desk. 

E. How is this document organized? 

The information presented in this notice is organized as follows: 

I. General Information

A. Does this proposal apply to me? 
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B. What should I consider as I prepare my comments for the EPA? 

C. Where can I get a copy of this document and other related information? 

D. What should I know about a possible public hearing? 

E. How is this document organized? 

II. Statutory, Regulatory and Policy Background for Proposal 

A. Statutory and Regulatory Background 

B. How has the EPA applied the statutory and regulatory definitions? 

C. Oil and Natural Gas Sector

D. What are the air emissions resulting from the oil and natural gas sector? 

E. How does the EPA regulate air emissions from the oil and natural gas sector? 

F. How has the EPA defined the source for the oil and natural gas sector previously? 

G. What approaches has the EPA taken recently regarding implementation of NSR and 

title V permitting for oil and natural gas sector sources?

H. What is the purpose of this proposed action? 

I. Policy Discussion

J. Why is the EPA proposing this action at this time?

K. What is the effect of this proposed rulemaking on other industries? 

L. What is the effect of this proposed rulemaking on permitting authorities? 

III. What are the options that the EPA is considering? 

A. Define Source Based on Proximity (Similar to the NESHAP) 

B. Define Source to Include Exclusively Functionally Interrelated Equipment 

C. Impacts of the Options on Air Permitting

D. Proposal is Limited to Onshore Oil and Gas Operations 

IV. Environmental Justice Considerations 

V. Statutory and Executive Order Reviews 

A. Executive Order 12866: Regulatory Planning and Review and Executive Order 

13563: Improving Regulation and Regulatory Review 

B. Paperwork Reduction Act 

C. Regulatory Flexibility Act

D. Unfunded Mandates Reform Act 

E. Executive Order 13132: Federalism 

F. Executive Order 13175: Consultation and Coordination with Indian Tribal 

Governments 

G. Executive Order 13045: Protection of Children from Environmental Health and 

Safety Risks

H. Executive Order 13211: Actions Concerning Regulations That Significantly Affect 

Energy Supply, Distribution, or Use 

I. National Technology Transfer and Advancement Act 

J. Executive Order 12898: Federal Actions to Address Environmental Justice in 

Minority Populations and Low-Income Populations 

K. Determination Under Section 307(d) 

Statutory Authority 

II. Statutory, Regulatory and Policy Background for Proposal 

A. Statutory and Regulatory Background 
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The major New Source Review (NSR) programs found in parts C and D of Title I of the 

Clean Air Act (CAA or Act) are preconstruction review and permitting programs that apply to 

new and modified major stationary sources of air pollutants subject to regulation under the Act. 

In areas where air quality does not meet the primary or secondary National Ambient Air Quality 

Standards (NAAQS) for a given pollutant and in the ozone transport region (OTR), which 

includes states in the Northeast and Mid-Atlantic regions, the program is implemented under part 

D of title I of the Act. This is called the “nonattainment” NSR (NNSR) program. In areas that 

meet the NAAQS, or “attainment” areas, or where we2 cannot determine whether those standards 

are met, or “unclassifiable” areas, the requirements under part C of title I of the Act apply. This 

program is called the PSD program. The regulations for these two NSR programs are found in 40 

CFR 51.165, 51.166, 52.21, 52.24 and part 51, appendix S. 

The NSR permitting programs are primarily implemented by state and local permitting 

authorities either through programs in their approved State Implementation Plans (SIPs) or 

through delegation of the federal program by the EPA. The EPA implements the federal PSD 

program and the NNSR program directly in reservation areas of Indian country and nonreservation areas of Indian country over which a tribe or the EPA has demonstrated that a tribe 

has jurisdiction, unless a tribe has developed a Tribal Implementation Plan (TIP). The EPA may 

also implement the federal PSD program directly in areas where the state or local area has not 

developed a SIP-approved program or has not requested delegation of the program by the EPA.

States are also required to have legally enforceable procedures that will allow them to prevent 

the construction or modification of a source that will interfere with attainment or maintenance of 

a NAAQS. In addition to the major source permitting programs, this is typically accomplished 

 

2 In this preamble, the term “we” and “our” refers to the EPA.
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through a state or local “minor” new source permitting program. The EPA implements a minor 

source permitting program in all reservation areas of Indian country, unless a tribe has developed 

a TIP and in any non-reservation areas of Indian country for which a tribe, or the EPA acting in 

the tribe’s place, has demonstrated that the tribe has jurisdiction. 

The NSR program applies to new and modified stationary sources of emissions. The 

CAA generally defines the term “stationary source” as “any source of an air pollutant” except 

those emissions from certain mobile sources or engines under CAA section 216 [CAA section 

302(z)]. The Act also defines some other terms that form the basis of specific NSR programs. So, 

for example, the PSD program requires a preconstruction permit for any “major emitting facility” 

constructed after a particular date [CAA section 164 (a)], and defines a “major emitting facility” 

as a “stationary source” emitting or with the potential to emit more than a certain amount of air 

pollutants [CAA section 169(1)]. 

Adhering to the statutory language in CAA section 111(a)(3), we have defined the term 

“stationary source” to mean “any building, structure, facility, or installation which emits or may 

emit a regulated NSR pollutant” [40 CFR 52.21(b)(5); 40 CFR 51.165(a)(1)(i); 40 CFR 

51.166(b)(5)]. We have then further defined the four statutory terms “building, structure, facility, 

or installation” collectively in our NSR regulations to mean “all of the pollutant-emitting 

activities which belong to the same industrial grouping, are located on one or more contiguous or 

adjacent properties, and are under the control of the same person (or persons under common 

control),” where the “same industrial grouping” refers to the two-digit Standard Industrial 
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Classification code [40 CFR 52.21(b)(6); 40 CFR 51.165(a)(1)(ii); 40 CFR 51.166(b)(6)].3 These 

three regulatory factors: (1) same industrial grouping; (2) location on contiguous or adjacent 

properties; and (3) under the control of the same person or persons must be evaluated on a caseby-case basis for each permitting decision. 

In addition to the pre-construction permitting requirements of the NSR program, title V 

of the CAA also requires a “major source” to obtain an operating permit, known as a title V 

permit [CAA section 501(2); CAA 502]. The title V definition of major source refers to the 

definitions in other sections of the Act, including the definition of major source for hazardous air 

pollutants (CAA section 112), the general CAA definition of major stationary source (CAA 

section 302) and the definition of major stationary source under the NNSR program. Each of 

these programs set different numerical emissions thresholds at which permitting requirements 

apply, which then become the basis for the major source determination in the title V program. 

Our operating permit regulations define major source as “any stationary source (or group 

of stationary sources that are located on one or more contiguous or adjacent properties, and are 

under common control of the same person (or persons under common control)) belonging to a 

single major industrial grouping...” (40 CFR 70.2, 71.2). As in the NSR programs, we have 

defined industrial grouping to refer to the two-digit SIC code (40 CFR 70.2, 71.2). Many state 

and local permitting authorities have approved title V permitting programs that have adopted 

similar definitions. 

B. How has the EPA applied the statutory and regulatory definitions? 

 

3

 The four-digit SIC code was the only code system in use at the time our rules were developed. 

This classification system has since been replaced by the six-digit NAICS, which was developed 

with Canada and Mexico, and is used for classifying North American businesses. While the SIC 

codes are no longer updated, the United States Department of Labor’s Occupational Safety and 

Health Administration still maintains the list of SIC codes for reference. 
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Source owner/operators and permitting authorities assess the three regulatory factors – 

same industrial grouping, location on contiguous or adjacent property, and under common 

control – on a case-by-case basis to determine which pollutant-emitting activities should be 

included as part of a single source when determining applicability of the NSR and title V 

permitting requirements. In the original promulgation and later application of these three factors, 

we have been mindful of the direction the D.C. Circuit Court of Appeals provided that the 

“source” for permitting purposes should comport with the “common sense notion of a plant” (45 

FR 52694, August 7, 1980 citing Alabama Power v. Costle). In the Alabama Power decision, the 

Court said that EPA cannot treat contiguous and commonly owned units as a single source unless 

they “fit within the four statutory terms...” (i.e., the terms building, structure, facility and 

installation). The Court said that we should “...provide for the aggregation, where appropriate, of 

industrial activities according to considerations such as proximity and ownership.” Alabama 

Power Co. v. Costle, 636 F. 2d 323, 397 (D.C. Cir. 1979). Examples of the case-by-case 

determinations made by the EPA, or by permitting authorities with the EPA’s input, applying 

these principles over several decades of NSR permitting are available at 

http://www.epa.gov/region07/air/nsr/nsrindex.htm. 

The EPA later promulgated the title V major source definition found at 40 CFR 70.2 (57 

FR 32250, July 21, 1992) and 71.2 (61 FR 34202, 34210, July 1, 1996). Not only were these 

definitions consistent with each other, but EPA was also clear that the language and application 

of the title V definition was to be consistent with the language and application of the PSD 

definition contained in section 52.21 (61 FR 34210, July 1, 1996). Examples of case-by-case

source determinations made by the EPA, or by permitting authorities with the EPA’s input, that 

apply the title V definitions are available at http://www.epa.gov/region7/air/title5/t5index.htm. 
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Reviewing both the NSR and title V guidance regarding source determinations, it is clear 

that we have used the term “contiguous or adjacent” to mean that the land associated with the 

source (i.e., building, structure, facility or installation) is connected to (i.e., contiguous) or 

nearby (i.e., adjacent) another source. In response to the Alabama Power decision, the EPA 

promulgated the 1980 PSD rule, including the definitions used to determine the scope of the 

source for permitting purposes (45 FR 52676, August 7, 1980). We explained that the 3-part test 

(same industrial grouping, location on contiguous or adjacent property, and under common 

control) would comply with the court decision by reasonably comporting with the purposes of 

the PSD program, approximating the common sense notion of a plant, and avoiding aggregating 

pollutant-emitting activities that would not fit within the ordinary meaning of building, structure, 

facility or installation (45 FR at 52694, August 7, 1980). In so doing, we considered but chose 

not to add a fourth factor or “functional interrelationship” test to the criteria for defining a 

source, as at that time, we believed that such a test would “embroil[] the Agency in numerous 

fine-grained analyses” (45 FR 52695, August 7, 1980). In the same rulemaking, we said that we 

did not intend “source” to include activities that are many miles apart along something like a 

pipeline or transmission line as a single source, but also noted that we were “unable to say 

precisely at this point how far apart activities must be in order to be treated separately” (45 FR 

52695, August 7, 1980). 

Even though our regulations use the term “adjacent,” they do not define “adjacent.” 

Similarly, even though the EPA’s historic interpretation is that “adjacent” means “nearby,”

neither our regulations nor our historic interpretations set a specific distance that we would 

consider “nearby.” Over the years, the EPA has considered both the distance between two or 

more sources and whether they share an operational dependence or functional interrelatedness to 
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determine whether they are “adjacent.” Even though our regulations do not explicitly define 

“adjacent,” we have provided policy interpretations of “adjacency” over time in the context of 

individual permitting actions many times because we were asked by permitting authorities to 

advise them on how to define a source within a specific permitting action. As is the case for most 

permitting-related decisions, these determinations were made on a case-by-case basis, 

considering the specific facts in each instance. In many of these cases and as explained in the 

examples below, we cited the principle of the “common sense notion of a plant” in making a 

determination regarding the scope of the source. 

In one example, we determined that two aluminum smelting operations within the same 

SIC code (3334), located approximately 3.4 miles apart and commonly owned by Alcoa, should 

be considered a single source for purposes of NSR applicability. Alcoa requested confirmation of 

this single source determination after it purchased one of the plants from another company, 

allowing both operations to share common control and management as well as a single SIC code. 

The EPA determined that the two operations should be considered adjacent because of the shared 

materials and personnel and the company’s assertion that the two plants would be operated as 

one facility.

4

 

In one case specific to the oil and natural gas sector, the EPA determined, in a letter 

issued by EPA Region 5 to Summit Petroleum Corporation, that an oil and gas sweetening plant 

and approximately 100 oil and gas wells located within the boundaries of the Saginaw Chippewa 

 

4

 Riva, Steven C. “Alcoa Messena Modernization Project and Request for a Single Source 

Determination.” March 9, 2009. EPA Region 7 Air Program New Source Review Program 

Policy & Guidance Index available at 

http://www.epa.gov/region07/air/nsr/nsrmemos/alcoany.pdf and in the docket for this 

rulemaking. 
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Band’s Isabella Reservation in Michigan were a single major source for purposes of the title V 

operating permit program.

5

 The EPA based its decision on its evaluation that the sweetening 

plant and wells share the same two-digit SIC code and are under common control (Summit 

Corporation). In addition, the EPA concluded that the plant and the wells were adjacent and, 

thus, a single source given their proximity and exclusive interdependence as demonstrated by the 

following facts: all of the wells are located within an 8-mile radius of the sweetening plant; all 

are connected by a dedicated system of pipes; and all oil and gas from the wells must be 

processed through the sweetening plant before it can be marketed. That determination was later 

challenged and overturned, as will be discussed later in this notice. 

Finally, in another example involving the oil and natural gas sector, the EPA determined 

that two natural gas compressor stations (Florida River and Wolf Point) and the numerous well 

sites owned or operated by BP and located within the Northern San Juan Basin should not be 

considered a single stationary source. In that situation, unlike the Summit Petroleum case 

discussed previously, there was no dedicated interrelationship between the wells and the 

compressor stations that would indicate that they should be treated as a single “plant.” Gas from 

the individual wells could flow to the two BP compressor stations, or other compressor stations. 

Gas production from BP’s wells would not have to stop if one or both of the BP compressor 

stations were shut down. Additionally, the gathering pipeline between the wells and the stations 

co-mingled gas from operators other than BP and the compressor stations likewise accepted gas 

 

5

 Newton, Cheryl. “Summit Petroleum Corporation Single Source Determination.” October 18, 

2010. EPA Region 7 Air Program New Source Review Program Policy & Guidance Index 

available at http://www.epa.gov/region07/air/nsr/nsrmemos/singler5.pdf and in the docket for 

this rulemaking. 
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from other operators. The EPA’s determination that this complex, dynamic system did not 

resemble a “common sense notion of a plant” was also challenged, and was settled.6 

In each of these examples, the EPA based its opinion on an analysis of the specific facts 

in the individual case. We have not established a “bright-line” distance beyond which we would 

always consider operations to be separate sources. Neither have we established a distance within 

which we would always consider operations to be one source. We have also not established that 

certain operations must always (or never) be considered together for permitting purposes. 

C. Oil and Natural Gas Sector 

The United States Census Bureau’s North American Industry Classification System 

(NAICS) describes the Oil and Gas Extraction industry (NAICS Code 2111) as including 

activities such as “exploration for crude petroleum and natural gas; drilling, completing, and 

equipping wells; operation of separators, emulsion breakers, de-silting equipment, and field 

gathering lines for crude petroleum and natural gas; and all other activities in the preparation of 

oil and gas up to the point of shipment from the producing property.”7 This definition includes 

activities such as natural gas processing and liquids extraction, and sulfur recovery from natural 

 

6 Videtich, Callie. “BP American Production Company’s Florida River Compression Facility 

Single Source Determination.” October 18, 2010. EPA Region 7 Air Program New Source 

Review Program Policy & Guidance Index available at 

http://www.epa.gov/region07/air/nsr/nsrmemos/singler8.pdf and in the docket for this 

rulemaking. The Environmental Appeals Board (EAB) docket for CAA Appeal No. 10-04 is 

available at 

http://yosemite.epa.gov/oa/EAB_Web_Docket.nsf/77355bee1a56a5aa8525711400542d23/2c6cf7

12eac2d7b38525788b00545227!OpenDocument&Highlight=2,CAA,10-04. The petition for 

review by the EAB, EPA Region 8’s response, and the reply by petitioner are available in the 

docket for this rulemaking. 

7

 U.S. Department of Commerce, United States Census Bureau, North American Industry 

Classification System, 2012 NAICS Definition, Sector 21 – Mining, Quarrying, and Oil and Gas 

Extraction, 21111 Oil and Gas Extraction http://www.census.gov/cgibin/sssd/naics/naicsrch?code=21111&search=2012 accessed 12/03/2013. 
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gas. Pipeline transmission and distribution of oil and natural gas, and storage of natural gas are 

included in NAICS subsector 486 Pipeline Transportation. 

The EPA has previously described in the preamble to its proposed New Source 

Performance Standard (NSPS) for the oil and natural gas sector that this sector includes

operations in the extraction and production of oil and natural gas, and the processing, 

transmission and distribution of natural gas. For oil, we described the sector as including “all 

operations from the well to the point of custody transfer at a petroleum refinery.” For natural gas, 

we described it as including all operations from the well to the customer (76 FR 52738, 52744, 

August 20, 2011). 

 For purposes of this proposed action, we are primarily interested in the first two of these: 

oil and natural gas production, and natural gas processing, or what may be referred to in the 

industry as “upstream” and “midstream” operations. For reasons that will be explained later in 

this notice, we do not intend to apply the proposed clarification to operations that take place 

offshore. Onshore production operations include “the wells and all related processes used in the 

extraction, production, recovery, lifting, stabilization, separation, or treating of oil and/or natural 

gas (including condensate). Production components may include, but are not limited to, wells 

and related casing head, tubing head and “Christmas tree” piping, as well as pumps, 

compressors, heater treaters, separators, storage vessels, pneumatic devices and dehydrators. 

Production operations also include the well drilling, completion and workover processes, and 

include all the portable non-self-propelled apparatus associated with those operations. Production 

sites include not only the “pads” where the wells are located, but also include standalone sites 

where oil, condensate, produced water and gas from several wells may be separated, stored and 

treated. The production sector also includes the low pressure, small diameter, gathering pipelines 
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and related components that collect and transport the oil, gas and other materials and wastes from 

the wells to the refineries or natural gas processing plants (76 FR 52744, August 20, 2011). 

Natural gas processing operations are aimed at removing impurities and other byproducts from the extracted gas. Natural gas consists primarily of methane. It may also contain 

water vapor, hydrogen sulfide (H2S), carbon dioxide (CO2), helium, nitrogen and other 

compounds. It commonly exists in mixtures with other hydrocarbons, referred to as natural gas 

liquids (NGL). Natural gas must be processed to remove these other compounds and gases 

before the gas is considered pipeline quality suitable for transmission and distribution. Natural 

gas processing removes and recovers the liquids, and non-methane gases, all or some of which 

may be sold. 

 D. What are the air emissions resulting from the oil and natural gas sector? 

Emissions from the oil and natural gas sector include volatile organic compounds (VOC), 

greenhouse gases (including methane), H2S, sulfur dioxide (SO2), carbon monoxide (CO) and 

nitrogen oxides (NOx). VOCs, including some hazardous air pollutants (HAP), are generally 

emitted during well completions, from equipment leaks and from storage tanks. Emissions of the 

greenhouse gas methane may also come from these sources while emissions of the greenhouse 

gas CO2 come primarily from combustion sources, such as flares, engines and compressors. 

Emissions of NOx and CO are also a result of these combustion operations. Emissions of sulfur 

compounds come from production and processing operations that treat “sour gas,” that is, natural 

gas with an H2S content of greater than 0.25 gr/100 scf. 

E. How does the EPA regulate air emissions from the oil and natural gas sector? 

 In addition to the source-specific permitting required by the NSR and title V programs, 

air emissions from the oil and natural gas sector are also regulated through other CAA-based 
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rules. The EPA first listed crude oil and natural gas production for NSPS development in 1979 

(44 FR 49222, August 21, 1979). An NSPS, 40 CFR part 60, subpart KKK, was promulgated in 

1985 that addressed VOC emissions from leaking components at onshore natural gas processing 

facilities (50 FR 26122, June 24, 1985). A second NSPS, regulating SO2 emissions from natural 

gas processing plants, 40 CFR part 60, subpart LLL, was promulgated in 1985 (50 FR 40158, 

October 1, 1985). In 2012, the EPA finalized revisions to these NSPS and established standards 

in 40 CFR part 60, subpart OOOO, limiting VOC emissions from gas wells, centrifugal 

compressors, reciprocating compressors, pneumatic controllers and storage vessels (77 FR 

49490, August 16, 2012). In 2013 and 2014, the EPA made certain amendments to the 2012 

NSPS standards in order to improve implementation of the standards (78 FR 58416, September 

23, 2013 and 79 FR 79018, December 31, 2014). Separately, the EPA is proposing to expand the 

NSPS (subpart OOOO) to regulate several additional categories of emitting equipment in this 

sector. 

The EPA has also regulated emissions of HAP from certain oil and natural gas sector 

processes through use of National Emissions Standards for Hazardous Air Pollutants (NESHAP), 

specifically the Oil and Natural Gas Production NESHAP (40 CFR part 63, subpart HH) and 

Natural Gas Transmission and Storage NESHAP (40 CFR part 63, subpart HHH). These 

regulations were first promulgated in 1999 (64 FR 32610, June 17, 1999) and were amended in 

2012 (77 FR 49490, August 16, 2012). 

F. How has the EPA defined the source for the oil and natural gas sector previously?

As discussed in the previous section, selected equipment and emitting activities involved 

in oil and gas production are regulated under both the NSPS and NESHAP programs. The NSPS 
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and NESHAP focus on technology-based standards for industrial source categories, and do not 

approach the regulation of stationary sources in the same way as required for NSR permitting. 

The definition of a major source in the NESHAP program is similar to, but 

distinguishable from, the definition of stationary source used in the NSR permitting programs. 

The NESHAP program defines a major source as a stationary source or a group of stationary 

sources “within a contiguous area” (40 CFR 63.2). This “major source” definition differs from 

the definition of stationary source used in the NSR permitting programs because it does not 

include “adjacent properties” [e.g., 40 CFR 52.21(b)(5)]. A major source under CAA section 112 

is further defined as any stationary source or group of stationary sources “that emits or has the 

potential to emit considering controls, in the aggregate 10 tons per year (tpy) or more of any 

HAP or 25 tpy or more of any combination of HAP.” [CAA section 112(a)(1)]. An area source 

of HAP is one that is not a major source of HAP. 

When Congress revised CAA section 112 in 1990, however, it included a specific 

provision discussing how oil and gas wells and pipeline facilities were to be treated with respect 

to regulating emissions of HAP [CAA section 112(n)(4)(A)]. This section provides that 

“notwithstanding” the definitions of major source in section 112, the emissions from any oil or 

gas exploration or production well (with its associated equipment) and emissions from any 

pipeline compressor or pump station “shall not be aggregated with emissions from other similar 

units” to determine whether the units or stations are major sources. Congress specified this 

whether the units are in a contiguous area or under common control. In the case of any oil or gas 

exploration or production well (with its associated equipment), such emissions “shall not be 

aggregated for any purpose under this section.” 
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In the NESHAP for Oil and Natural Gas Production Facilities, the EPA defines the 

affected source consistent with this requirement of the Act, including which associated 

equipment should be part of the facility, which associated equipment could potentially be 

aggregated, and which cannot be aggregated as per CAA section 112(n)(4)(A) [40 CFR 

63.760(b)]. The EPA defines this associated equipment to include “equipment associated with an 

oil or natural gas exploration or production well, and includes all equipment from the wellbore to 

the point of custody transfer” (40 CFR 63.761). The EPA defines the facility for purposes of the 

NESHAP to mean “the grouping of equipment where hydrocarbon liquids are processed, 

upgraded (i.e., remove impurities or other constituents to meet contract specifications), or stored 

prior to the point of custody transfer” or where natural gas is “processed, upgraded, or stored” 

prior to natural gas transmission and storage. For the purpose of the NESHAP major source 

determination, facility (including a building, structure, or installation) means oil and natural gas 

production and processing equipment that is located within the boundaries of an individual 

surface site as defined in the NESHAP (40 CFR 63.761). 

Furthermore, the EPA defines surface site as “any combination of one or more graded 

pad sites, gravel pad sites, foundations, platforms, or the immediate physical location upon 

which equipment is physically affixed” (40 CFR 63.761). The effect of these definitions is to 

define the affected facility based on the emissions from equipment and activities that are in close 

proximity to each other. The EPA stated that its intent in defining affected facility in this way 

was both to comply with the specific language in CAA section 112(n)(4), and to reduce the 

burden on owners and operators in making source determinations. The EPA stated at that time its 

belief that it was not reasonable to aggregate emissions from surface sites that are located on the 
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same lease, but are at great distances from each other, even though they would be under common 

control (64 FR 32618, June 17, 1999). 

G. What approaches has the EPA taken recently regarding implementation of NSR and title V 

permitting for oil and natural gas sector sources? 

As was the case with other industry categories, the EPA initially approached permitting 

decisions in the oil and natural gas sector on a case-by-case basis without any specific guidance 

until 2007. At that time, because of an increase in oil and gas development, and an increase in

permit activity, the EPA issued the first guidance document specific to this industry. The EPA 

built on the idea of using the surface site, as defined in 40 CFR 63.761, and the proximity of 

surface sites to each other in permitting guidance, when it issued a guidance document titled 

“Source Determinations for Oil and Gas Industries” in 2007.8 This 2007 memo is relevant to our 

proposed action because it acknowledged that source determinations within the oil and gas 

industry may not be as straightforward as those within other regulated industries. We note that 

even in cases that clearly meet the tests of same SIC code and common control, the nature of oil 

and gas exploration and production operations may require a detailed evaluation to determine 

whether sources are on contiguous or adjacent properties. Production fields, even if under the 

control of a single operator, may cover large areas. Unlike many other industries, however, the 

expanse of land on which these commonly-controlled operations are located is frequently not 

owned or controlled by the owner/operator of the oil and gas activity. Instead, the producers may 

control only the surface area that holds the well and associated production equipment. 

 

8

 Wehrum, William. “Source Determinations for Oil and Gas Industries.” January 12, 2007. EPA 

Region 7 Air Program New Source Review Program Policy & Guidance Index available at 

http://www.epa.gov/region07/air/nsr/nsrmemos/oilgas.pdf and in the docket for this rulemaking. 
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As discussed earlier in this notice, EPA has previously said that it would not consider all 

facilities along a pipeline to be one source. The 2007 memo built upon that idea to conclude that, 

for the oil and gas production industry, “we do not believe determining whether two activities are 

operationally dependent drives the determination as to whether two properties are contiguous or 

adjacent, because it would embroil the Agency in precisely the fine-grained analysis we intended 

to avoid and would potentially lead to results which do not adhere to the common sense notion of 

a plant.” Thus, the 2007 memo acknowledged that permitting authorities may consider 

proximity, and not operational dependence, as the most informative factor in determining the 

scope of a source, and recommended the approach used in CAA section 112 and the NESHAP 

for Oil and Natural Gas Production Facilities (the “surface site”) as the starting point for 

determining the boundaries of the source for NSR and title V. Beyond the surface site, the memo 

recommends that permitting authorities consider aggregating multiple surface sites if they are in 

close proximity, i.e., physically adjacent or separated by no more than a short distance. However, 

consistent with the EPA’s overall permitting practice, the 2007 memo concluded that the 

decision of whether a permitting authority should aggregate two or more pollutant-emitting 

activities into a single source for permitting remains a case-by-case decision taking into 

consideration the factors relevant to the specific case. 

In 2009, the EPA withdrew the 2007 memo. 9

 In doing so, we reinstated the use of the 

fundamental criteria for making source determinations for the oil and natural gas sector based on

the use of the three factors contained in our regulations; same SIC code, common control, and 

 

9

 McCarthy, Gina. “Withdrawal of William Wehrum’s January 12 2007 Issued Guidance Memo 

‘Source Determinations for Oil and Gas Industries’.” September 22, 2009. EPA Region 7 Air 

Program New Source Review Program Policy & Guidance Index available at 

http://www.epa.gov/region07/air/nsr/nsrmemos/oilgaswithdrawal.pdf and in the docket for this 

rulemaking. 
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location on contiguous or adjacent property. This fact-specific examination is consistent with the 

EPA’s historical practice in other industries, and is in contrast to the simplified approach of 

relying principally on proximity that was the focus of the 2007 memorandum. From 2009 

forward, the EPA recommended that permitting authorities conduct each source determination 

based on a case-by-case evaluation of the emissions activities at each building, structure, facility 

or installation. The 2009 memo acknowledged that proximity might well serve as the 

overwhelming factor in a permitting authority’s source determination decision, but the 

conclusion could only be justified after examining all relevant factors, consistent with regulatory 

requirements and historical practice. 

The EPA has had direct experience as the permitting authority in making source 

determinations for onshore oil and gas operations in Indian country. The 2010 permit for 

compressor stations located on the Southern Ute Indian Reservation (Florida River and Wolf 

Point) and the Summit Petroleum permits are two examples discussed in detail previously. In 

these cases, the EPA conducted a fact-specific examination of the three factors in determining 

which emitting activities should be included in title V permits. In both of these cases, the source 

determinations were challenged.

The EPA was challenged on its source determinations for the Florida River permit by 

WildEarth Guardians. They challenged the EPA’s decision not to aggregate certain wells into a 

single source in the title V permit renewal. EPA entered into a settlement agreement with the 

petitioner and agreed to undertake a “pilot” program to gather additional information “for the 

purpose of studying, improving and streamlining oil and gas source determinations in new or 
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renewal Title V permits.”10 The EPA has collected data from several permit applicants, but has 

not yet issued permits based on that data, due to uncertainties created by court decisions 

discussed later in this proposal. 

In the case of Summit Petroleum’s operations in Rosemont, Michigan, also discussed 

previously, the EPA determined in 2010 that the company’s gas sweetening facility and 

associated wells were under common control and in the same major industrial grouping. In 

addition, the EPA determined that they were adjacent because of the functional interrelatedness

of the operations. The EPA determined that the source must get a title V operating permit. 

Summit appealed that determination to the United States Court of Appeals for the Sixth

Circuit, which issued a decision that overturned the EPA’s title V applicability determination. 

Summit Petroleum Corp. v. U. S. Environmental Protection Agency, 690 F.3d 733 (6th Cir. 

2012). In the decision, the Court said that the EPA’s use of interrelatedness in determining 

whether sources were “adjacent” is unreasonable and contrary to the plain meaning of the term

as currently used in EPA’s regulations. The two judges in the majority found that the term 

“adjacent” was unambiguous and its plain meaning related only to physical proximity, and thus 

could not include consideration of functional interrelatedness. The EPA sought rehearing of the 

Court’s decision, but that request was denied. 

In a memorandum, EPA Headquarters then instructed its Regional Air Directors that the 

agency intended to apply the outcome of the Sixth Circuit decision only in the states under the 

 

10 U. S. Environmental Protection Agency. February 20, 2012. Motion for Dismissal. In re: BP 

America Production Company, Florida River Compression Facility, Permit No. V-SU-0022-

05.00. Available at 

http://yosemite.epa.gov/oa/EAB_Web_Docket.nsf/(Filings)/E340610E897366E1852579AB00544

3C4/$File/Motion%20for%20Dismissal...41.pdf and in the docket for this rulemaking. 
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jurisdiction of the Sixth Circuit and that we would continue to make stationary source 

determinations for title V and PSD permitting consistent with the agency’s long-standing 

interpretations of its regulations in the rest of the country.11

The EPA’s guidance memo to its regional offices was challenged by the National 

Environmental Development Association’s Clean Air Project (NEDA/CAP) in the D.C. Circuit 

Court of Appeals. National Environmental Development Association’s Clean Air Project v. 

Environmental Protection Agency, 752 F.3d 999 (D.C. Cir. 2014). NEDA/CAP alleged that the 

memorandum violated the EPA’s Regional Consistency regulations by establishing inconsistent 

permit criteria in different parts of the country. The D.C. Circuit agreed and held that the memo 

conflicted with EPA regulations that promote uniform national regulatory policies. 752 F.3d at 

1009 (discussing 40 CFR part 56). In essence, the Court found that EPA bound itself to 

consistency with the Summit decision through its own regulations. In issuing the decision, the 

D.C. Circuit indicated that the EPA could have avoided a conflict between its December 2012

memo and the Regional Consistency regulations by revising the source determination regulations 

to explicitly require consideration of functional interrelatedness. 

 

11 Page, Stephen. “Applicability of the Summit Decision to EPA Title V and NSR Source 

Determinations.” December 21, 2012. EPA Region 7 Air Program New Source Review Program 

Policy & Guidance Index available at 

http://www.epa.gov/region07/air/nsr/nsrmemos/inter2012.pdf and in the docket for this 

rulemaking. 
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H. What is the purpose of this proposed action? 

The purpose of this action is to request comment on the best approach to define 

“adjacent” for the onshore oil and natural gas sector.

12 We believe it is important to address this 

industry separately because permitting decisions are difficult and time-consuming. Providing this

guidance will promote a consistent regulatory treatment for this industry. In addition, this 

industry continues to grow at a rapid pace, and the sheer number of determinations that need to 

be made heightens the need for guidance in the near term. 

 We also believe it is important to address this issue through a rulemaking. The oil and gas 

source determination guidance provided by the EPA on two separate occasions, in 2007 and 

2009, was issued in the form of a memo, with no opportunity for public notice and comment. 

Then, as discussed above, the subsequent onshore oil and gas permitting decisions made by EPA 

were challenged, and both guidance memos were referenced or relied upon by the parties in 

those challenges. The EPA is interested in addressing any uncertainty by providing additional 

clarity through rulemaking and seeking comment on the best approach for defining the term 

“adjacent” specific to the onshore oil and natural gas sector. 

I. Policy Discussion

 An important consideration in deciding how to define the stationary source for oil and gas 

operations is the environmental protection that is achieved by aggregating multiple pollutantemitting activities into a single source. Under the PSD and NNSR programs, new major sources 

or major modifications at major sources for a given pollutant are subject to either Best Available 

 

12 We note that the EPA Administrator signed a separate proposal on August 5, 2015 to amend 

the Regional Consistency Regulations to address consistency issues resulting from judicial 

decisions. See Environmental Protection Agency, RIN 2060-AS53 available at 

http://www.epa.gov/nsr/actions.html. 
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Control Technology (BACT) or Lowest Achievable Emissions Reduction (LAER) controls, 

depending on the air quality designation status for that pollutant of the area in which the source 

is located. These controls may be more stringent than controls required at minor sources. 

Because major source BACT or LAER controls may be continually improving, permitting 

authorities must assess and sources must install the best technology at the time a permit is issued, 

instead of what was the best the last time an NSPS or NESHAP was updated. Therefore, these 

case-by-case controls required for major sources or major modifications at major sources are 

often more stringent than controls required under NSPS or NESHAP, if those standards have not 

been recently updated, because control technology tends to improve over time. 

In addition, if the source is or will be located in an area that is designated nonattainment, 

emissions reductions, known as offsets, may be required in higher ratios to compensate for the 

proposed emissions increase. Therefore, aggregating activities into major sources may result in 

more oil and gas sources being subject to greater control under LAER, in addition to having to 

obtain offsets, resulting in greater environmental protection. 

Aggregating facilities is also more likely to result in sources being subject to operating 

permitting requirements under title V of the Act. While this does not result in any additional 

control requirements, it may result in additional monitoring and reporting requirements that 

provide more information on the operation of the source to the regulators and interested citizens. 

The title V permitting process includes opportunities for public participation, EPA oversight, and 

citizens’ rights to petition the EPA to object to permits. These opportunities exist at both the 

initial permit issuance, and at permit renewal, which occurs every five years. The title V process 

provides more opportunities for public participation than minor source permitting, which 
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generally includes public participation only at the time of initial construction or modification, 

and under processes that vary according to the permitting authority. 

Aggregating activities may also provide facility owners/operators with greater flexibility

to modify operations without triggering additional permitting requirements. A source consisting 

of multiple emitting activities may be able to “net out” of further PSD or NNSR permit review 

by reducing emissions in one part of a source in order that emissions at another part of the source 

may increase. This allows sources to avoid additional permitting requirements for modifications 

to an existing facility under PSD and NNSR by taking credit for reductions that have already 

occurred within the facility. A smaller source offers less opportunity to “net out” because there 

are fewer emitting activities that can be reduced if a modification results in an increase. Finally, 

netting is usually not available under minor NSR programs, so smaller minor sources would 

likely not be able to take advantage of netting to avoid minor NSR permitting requirements. 

 Another approach to achieving environmental protection is to require controls by direct 

federal regulation through the NSPS or NESHAP programs. The NSPS program results in 

significant control and is applicable to new, modified and reconstructed sources. The NSPS also 

includes monitoring and recordkeeping requirements. The NESHAP program also results in 

significant control of HAP, many of which are also VOCs, and is applied to both new and 

existing sources. Each of the emissions standards established pursuant to these programs must be 

reviewed and revised, if necessary, at least every eight years to take into account developments 

in practices, processes and control technologies. These standards apply to affected facilities 

independent of the need for an NSR permit. Separately, the EPA is proposing revisions to 40 

CFR part 60, subpart OOOO, the NSPS for the oil and natural gas sector. 
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Additional controls may be required for sources located in nonattainment areas, including 

minor sources, through a SIP, or through a Federal Implementation Plan (FIP) in areas where 

EPA is the regulatory authority, such as in certain areas of Indian country. The CAA requires 

implementation of reasonable available control technology (RACT) for major sources in 

moderate and above ozone nonattainment areas and in the Ozone Transport Region (OTR). The 

EPA develops Control Techniques Guidelines (CTGs) to inform a state’s RACT determinations. 

Separately, the EPA is proposing a CTG for the oil and natural gas sector. 

All of these programs (NSPS, NESHAP, RACT and state SIP/EPA FIP requirements) 

typically apply to emitting equipment, irrespective of the total emissions of the source at which 

the equipment is located, although there may be thresholds for individual types of equipment. An 

advantage of applying environmental control through these programs is that the administrative 

burden of applying for, obtaining, and maintaining major source permits can be reduced for 

sources because these limitations establish enforceable limits on the sources’ potential to emit, 

and can keep a source from being considered major. The burden of reviewing and issuing major 

source permits is likewise reduced for permitting authorities. 

The biggest advantage to sources, particularly in this industry, is that controlling 

emissions through NSPS, NESHAP or emission control standards imposed by states through 

their SIPs does not require case-by-case pre-approval as do the controls determined through 

major source permitting. This provides greater certainty to the source owners and operators 

without the delays associated with such permitting. Communities can also be certain of the 

controls sources are required to install and operate because the sources do not have the 

opportunity to “net out” of controls through a permitting process. Compliance and enforcement 

are also enhanced because the control, monitoring and recordkeeping requirements are consistent 
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for each type of equipment and do not differ from site to site, or in the case of federal controls, 

state to state. 

For the oil and gas industry, where source owners/operators must obtain the right to drill 

in a particular location and only hold those rights for a limited period of time, the ability to 

proceed quickly is important. For communities and air regulators, the ability to protect air quality 

and public health is important. A major source permit typically takes a year or more to process. 

If there is uncertainty about what should be included as part of that permitted source, the time to 

issue a permit can take longer. We believe that the most important result of a major or minor 

permit for all stakeholders, including the regulated industry, the community in which the source 

is located, and the permitting authority, is the requirement to install control technology to 

minimize air emissions and protect public health and the environment. We think that providing 

clarity about the scope of the source through this rule, and the emissions control requirements 

associated with other rules being proposed by the EPA serves the interests of all stakeholders. 

J. Why is the EPA proposing this action at this time?

One reason for taking this action is to resolve the uncertainty that the litigation over the 

Summit Petroleum source determination and resulting guidance has created for both permitting 

authorities and for owners/operators of regulated sources. Another reason is to develop a 

coordinated approach to regulating emissions from oil and gas sources under the variety of 

regulatory mechanisms available to state and federal regulatory agencies. There has been an

increase in oil and gas production resulting from the rise in use of unconventional methods of 

extraction (e.g., the use of hydraulic fracturing), and this production is taking place in more areas 

and at a faster pace than in the recent past. We believe this justifies a new look at the best way to 

regulate and permit these operations. In separate notices, the EPA is proposing to require 
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additional controls for the emissions from the oil and natural gas sector. Those requirements 

include additional requirements for new sources under the NSPS, requirements for minor sources 

at oil and gas operations in Indian country, and a CTG that will inform RACT determinations for 

existing major VOC sources located in moderate or above ozone nonattainment areas and in the 

OTR. 

 We believe that the additional emissions controls required for new sources under the 

revised NSPS makes it less likely that major source permitting would result in substantial 

additional pollution control. In commenting on this proposal, commenters are encouraged to 

consider how emission controls being proposed in separate EPA notices may impact the 

preferred option in this proposal. 

K. What is the effect of this proposed rulemaking on other industries? 

At this time, the EPA is proposing to clarify the definition of “adjacent” used to 

determine the source to be permitted within the PSD, NNSR and title V programs as it applies to 

the oil and natural gas sector for the reasons discussed earlier in this proposal. The EPA believes 

that the unique characteristics of this industry – such as the underground mineral rights versus 

surface land ownership, widespread operations and interconnectedness via pipeline, etc. – 

warrant an industry-specific definition that will streamline the assessment of which operations 

should be considered to be on contiguous or adjacent properties. For other industries, we 

continue to believe that a case-by-case assessment of the three factors remains the appropriate 

method of making source determinations. For these industries, as discussed previously, we 

believe it is generally less difficult to determine the scope of the source, because the operations 

already take place at facilities that more clearly match the common sense notion of a plant. 

L. What is the effect of this proposed rulemaking on permitting authorities? 
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We are proposing to make changes to both the PSD and NNSR programs in this 

rulemaking. We believe that it may be possible for some states to interpret their existing state 

rules consistent with this rulemaking (when final) and may not need to revise SIPs to incorporate 

these changes. However, we intend to encourage states to revise their SIPs to adopt these 

changes, when final. Similarly, states would be expected to make conforming changes to their 

operating permit programs. While we are proposing changes to both the federal programs and the 

requirements for state programs, we invite comment on whether states should be required to 

adopt these changes. 

III. What are the options that the EPA is considering?

In this proposal, the EPA is proposing and requesting comment on two options for 

clarifying the definition used to determine the source to be permitted within the NSR and title V 

programs as it applies to the oil and natural gas sector. As we stated before, any determination of 

the scope of a source requires a fact-specific inquiry into each of the three regulatory factors, i.e., 

whether emitting activities share the same SIC code, are under common control, and are 

contiguous or adjacent. We are not proposing to change or take comment on this inquiry or the 

three factors. However, in this notice, the EPA is taking comment on how the term “adjacent” in 

the third factor should be applied specifically to emission units in the oil and natural gas sector. 

A. Define Source Based on Proximity (Similar to the NESHAP) 

 Under the first, and currently preferred, option for which the EPA is taking comment, the 

EPA proposes to define “adjacent” such that the source is similar to that in the NESHAP for this 

industry, Subpart HH, National Emissions Standards for Hazardous Air Pollutants From Oil and 

Natural Gas Production Facilities (40 CFR 63.760). Under this option, the “source” for oil and 

natural gas sector activities is presumed to be limited to the emitting activities at the surface site, 
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and other emitting activities will be considered “adjacent” if they are proximate. Thus, under this 

first option, two or more surface sites must be considered as a single source if they share the 

same SIC code, are under common control, and are contiguous or are located within a short 

distance of one another. 

We prefer this option because we believe that a definition that centers on a surface site is 

familiar to the industry and the regulators because of the current NESHAP requirements, so it 

will streamline permitting. We also believe that a definition focused on a surface site most 

closely represents the common sense notion of a plant for this industry category. Surface sites 

that are not in close proximity to one another may be on a separate lease which may not align 

with the common sense notion of a single plant. In addition, we believe that this definition is 

consistent with Congress’ intent, at least as they expressed it with regard to HAPs, as discussed 

previously. 

Under this option, as we are proposing it, the source owner/operator would not be 

required, and would not be allowed, to include additional emitting activities in a permit beyond 

those in the source as defined. This could mean that an owner/operator must obtain more 

individual construction permits and possibly more operating permits. However, these would be 

more likely to be minor source permits. If finalized, owner/operators could lose the benefits of 

being able to net emissions over a larger source, which could be a disadvantage, particularly for 

sources in nonattainment areas. We request comment on this more limited concept of source for 

this industry, specifically whether limiting the scope of the source in this way provides sufficient 

guidance for sources and permitting authorities to permit these sources in a consistent and 

efficient manner. 
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In addition, we request comment on whether it is appropriate to establish a specific 

distance within which to consider multiple surface sites as a single source, and if so, what that 

distance should be. Some states, such as Texas, Oklahoma, Louisiana and Pennsylvania, have 

issued guidance that presumes that operations within 1⁄4 mile should be considered a single 

source. We believe that it will be helpful to prescribe a distance in this rule, given that this 

question has generated significant confusion and uncertainty in the past. The EPA is proposing to 

adopt a distance of 1⁄4 mile but is asking for comment on whether another distance, such as 1⁄2 

mile, is an appropriate distance to consider for defining a single source even if on separate 

surface sites (i.e., operations beyond that distance would not be considered for aggregation). 

Louisiana’s guidance further specifies that facilities should not be “daisy-chained” 

together to establish a single contiguous source.13 A series of emission units are “daisy-chained” 

when each individual unit is located within the specified “contiguous or adjacent” distance from 

the next unit, but where the last unit is separated from the first unit by a much larger distance. 

We request comment on whether the EPA should make a similar distinction if we adopt this 

proximity-focused source definition. Louisiana’s guidance goes on to specify that the geographic 

center of the site’s emissions defines the center for purposes of establishing the 1⁄4 mile distance 

used to determine the boundary of the single source. We request comment on whether the center 

or some other feature, such as the boundary of the surface site, is more appropriate to use as the 

starting point of the measurement radius when determining the source. 

 

13 Louisiana Department of Environmental Quality. Interpretation of Contiguous for Oil & Gas 

Production Facilities. 

http://www.deq.louisiana.gov/portal/DIVISIONS/AirPermitsEngineeringandPlanning/AirPermits

ProceduresandGuidance/ContiguityandOilandGasProduction.aspx. March 2015. 
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We also request comment on whether there are instances where setting such a bright-line 

distance could increase or limit permitting authority oversight of these sources because they 

would be more likely to be subject to minor source permitting. We also request comment on 

whether the potentially smaller scope of each source could result in an unacceptable permitting 

burden (by creating a larger number of smaller sources) on the regulated community or on 

permitting authorities. 

While the EPA does not expect there would be adverse air quality impacts as a result of 

this approach, we are interested in whether there might be any environmental effect, including 

effects on NAAQS compliance from this approach, with either benefit or harm resulting. Finally, 

we request comment on whether there are circumstances in which an owner/operator would 

prefer to combine surface sites or other operations that are beyond the presumptive distance, e.g., 

1⁄4 mile, and seek a PSD or NNSR permit, and whether the EPA should preserve this option. If 

so, should the option to seek a major source permit be limited to the owner or operator’s 

discretion, or should a permitting authority be able to make this determination, and under what 

circumstances? 

B. Define Source to Include Exclusively Functionally Interrelated Equipment 

 Under the second option, the EPA proposes to define the “source” for the oil and natural 

gas sector to include all of the interrelated equipment that is under common control, is in the 

two-digit SIC (Code 13 Oil and Gas Extraction), and is on contiguous or adjacent property, 

where the EPA would presume that equipment in an oil and gas field is “adjacent” if it is 

proximate, or if it is exclusively functionally interrelated. Exclusive functional interrelatedness 

might be shown by connection via a pipeline or other means, because of the physical connection 

between the equipment. Other examples of factors that could be assessed to determine 
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interrelatedness include exclusive delivery of product from one group of equipment to the other 

via truck or train and facts such as whether one group of equipment would be able to operate if 

the other group of equipment was not operating. The EPA and states would make a 

determination of adjacency based on a consideration of the interrelatedness of emitting activities 

in addition to the distance between them. So, for the oil and natural gas sector, pollutant-emitting 

activities will be considered adjacent if one of the following circumstances apply: 1) the 

pollutant-emitting activities are separated by a distance of 1⁄4 mile or more and there is an 

exclusive functional interrelatedness; or 2) the pollutant-emitting activities are separated by a 

distance of less than 1⁄4 mile. 

The consideration of interrelatedness is consistent with the EPA’s current and historical 

practice for other industries and its longstanding practice for oil and natural gas sector activities. 

The EPA is requesting comment on this approach to better understand the perspective of various 

stakeholders. What are the advantages and disadvantages to this approach? Are there 

characteristics related to the oil and natural gas sector that would make this approach more or 

less difficult to implement than the preferred alternative, such as need to examine various 

interrelatedness criteria or the interconnectedness of the operations through pipelines? Should the 

EPA further define exclusive functional interrelatedness for this sector to provide additional 

clarity to regulators and the regulated community? For example, should the EPA limit exclusive 

functional interrelatedness for this sector to emitting equipment that is configured in a “hub and 

spoke” model, where oil or gas produced from one or more wells has a dedicated flow (via a 

pipeline or other delivery method) to only one possible downstream point for further 

compression, processing or storage? Are there other configurations specific to this industry that 

the EPA should consider to be exclusively functionally interrelated? 
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In addition, is there any environmental benefit or harm that might result from this 

approach? For example, could this approach create a disincentive to building pipelines, and what 

would be the environmental effect of those decisions? Finally, the EPA requests comment on 

whether there is a specific distance beyond which sources in the oil and gas industry should not 

be considered interrelated, even if interconnected by pipeline. 

C. Impacts of the Options on Air Permitting

The EPA expects that the combined effect of all the rules being proposed, including the 

proposed changes to the NSPS, the proposed rule for oil and gas sources in Indian country, and 

the CTG, will be to reduce the number of major oil and gas sources, even if we finalize Option 2. 

The proposed rules add requirements for enforceable controls, thereby decreasing potential 

emissions and making it less likely that major source permitting will be required. This is because 

a source’s potential emissions are determined after taking into account controls that are 

enforceable as a practical matter, such as those required in the NSPS and a SIP adopting the 

CTG. 

The two options presented in this rule differ primarily in the permitting burden placed on 

sources and permitting authorities. In the EPA’s experience, it takes significantly longer to apply 

for and review a PSD application than it does to apply for and review a minor NSR permit. 

Option 1 can be expected to result in fewer major sources than Option 2, but more minor 

sources. Option 2 can be expected to result in more major sources, as some otherwise minor 

sources could be combined into a smaller number of major sources. 

Because the EPA would benefit from public comment on all of these issues, the EPA is 

co-proposing these two approaches and, following review of public comments on the issues 

raised by each approach, anticipates adopting one of the approaches in the final rule. We 
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welcome comments on these two discrete options, or some combination of these, and other 

options for determining the source for permitting oil and natural gas sector operations. 

D. Proposal is Limited to Onshore Oil and Gas Operations

The EPA is proposing to limit this rulemaking to onshore oil and gas operations for a 

number of reasons. First, the CAA already contains a specific definition of “outer continental 

shelf source” which includes any “equipment activity, or facility which emits or has the potential 

to emit any air pollutant” specifically including “platform and drill ship exploration, 

construction, development, production, processing, and transportation.” In addition, “emissions 

from any vessel servicing or associated with an outer continental shelf (OCS) source, including 

emissions while at the OCS source or en route to or from the OCS source within 25 miles of the 

OCS source” must be included when determining the OCS source [CAA section 328(a)(4)(C)]. 

In our permitting experience, these OCS sources are more likely than onshore operations to be 

stand-alone major PSD sources. The EPA has issued permits for exploration rigs to operate as 

portable PSD sources, allowing them to operate in a number of locations under one permit. We 

believe that this current approach provides sufficient streamlining for both sources and 

permitting authorities and propose to continue the existing case-by-case approach for offshore 

sources. 

IV. Environmental Justice Considerations 

This proposal is intended to clarify the definition of adjacent used to determine the source 

to be permitted within the existing PSD, NNSR and title V programs as it applies to the oil and 

natural gas sector. This clarification will assist permitting authorities and permit applicants in 

making source determinations for the oil and gas industry and is not intended to result in less 

environmental protection for human health and the environment. It is being proposed as a part of 
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a comprehensive strategy to reduce emissions from the oil and natural gas production sector 

which includes new (or lower) emission standards or requirements for a number of types of 

emitting equipment. It, therefore, is not expected to have a disproportionately high and adverse 

human health or environmental effects on minority populations or low-income populations. 

However, the permitting process, particularly under the major source programs, NSR and title V, 

may provide opportunities for public participation at individual sources that may be of interest to 

minority or low-income populations. 

V. Statutory and Executive Order Reviews 

A. Executive Order 12866: Regulatory Planning and Review and Executive Order 13563: 

Improving Regulation and Regulatory Review 

This proposed action is a significant regulatory action that was submitted to the Office of 

Management and Budget (OMB) for review because it raises novel legal and policy issues 

arising out of the President’s priorities. Any changes made in response to OMB 

recommendations have been documented in the docket. 

B. Paperwork Reduction Act 

This proposed action would not impose any new information collection burden. 

However, the OMB has previously approved the information collection requirements contained 

in the existing regulations for PSD (40 CFR 52.21) and title V (40 CFR parts 70 and 71) under 

the provisions of the Paperwork Reduction Act, 44 U.S.C. 3501 et seq and has assigned OMB 

control numbers 2060-0003, 2060-0336 and 2060-0243. The OMB control numbers for the 

EPA’s regulations in 40 CFR are listed in 40 CFR part 9. Instead of new information collection 

burdens, this proposed action proposes proffers options that clarify the existing permitting 
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requirements applicable to new and modified oil and natural gas sector sources. This proposed 

action is not likely to increase the burden associated with permitting, and may reduce it.

C. Regulatory Flexibility Act

The Regulatory Flexibility Act (RFA) generally requires an agency to prepare a 

regulatory flexibility analysis of any regulation subject to notice and comment rulemaking 

requirements under the Administrative Procedures Act or any other statute unless the agency 

certifies the rule will not have a significant economic impact on a substantial number of small 

entities. Small entities include small businesses, small organizations and small governmental 

jurisdictions.

For purposes of assessing the impacts of this proposed rule on small entities, small entity 

is defined as: (1) a small business as defined in the Small Business Administration’s (SBA) 

regulations at 13 CFR 121.201; (2) a small governmental jurisdiction that is a government of a 

city, county, town, school district or special district with a population of less than 50,000; and (3) 

a small organization that is any not-for-profit enterprise which is independently owned and 

operated and is not dominant in its field. 

After considering the economic impacts of this proposed rule on small entities, I certify 

that this proposed action will not have a significant economic impact on a substantial number of 

small entities. In making this determination, the impact of concern is any significant adverse 

economic impact on small entities. An agency may certify that a rule will not have a significant 

economic impact on a substantial number of small entities if the rule relieves regulatory burden, 

has no net burden or otherwise has a positive economic effect on the small entities subject to the 

rule. Entities potentially affected directly by this proposal include sources in the oil and natural 

gas sector. We intend with this proposal to clarify the existing requirements for permitting new 
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and existing sources in the oil and natural gas sector. We believe that any option finalized after 

notice and comment rulemaking will not increase, and may decrease, the administrative burden 

for permitting these sources, including those that may be small entities. We have, therefore, 

concluded that this proposed action will have no net regulatory burden for all directly regulated 

small entities. 

We continue to be interested in the potential impacts of the proposed rule on small 

entities and welcome comments on issues related to such impacts.

D. Unfunded Mandates Reform Act 

This proposed action does not contain an unfunded mandate of $100 million or more as 

described in the Unfunded Mandates Reform Act of 1995 (UMRA), 2 U.S.C. 1531-1538, and 

does not significantly or uniquely affect small governments. This action imposes no enforceable 

duty on any state, local or tribal governments or the private sector. The CAA imposes the 

obligation for private sector sources to obtain permits prior to construction. Many states and 

some local governments choose to implement those requirements. In other areas, the EPA 

implements those requirements. In this proposal, the EPA is taking comment on the most 

appropriate way to implement those requirements for an industry category. Therefore, this 

proposed action is not subject to the requirements of sections 202, 203 and 205 of the UMRA.

E. Executive Order 13132: Federalism 

This proposed action does not have federalism implications. It will not have substantial 

direct effects on the states, on the relationship between the national government and the states, or 

on the distribution of power and responsibilities among the various levels of government, as 

specified in Executive Order 13132. The requirement to obtain permits for new major sources is 

imposed by the CAA. This proposed rule, if made final, would interpret those requirements as 
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they apply to the oil and natural gas sector. Thus, Executive Order 13132 does not apply to these 

proposed regulation revisions. 

In the spirit of Executive Order 13132 and consistent with the EPA policy to promote 

communications between the EPA and state and local governments, the EPA specifically solicits 

comments on this proposed action from state and local officials. 

F. Executive Order 13175: Consultation and Coordination with Indian Tribal Governments 

 This action does not have tribal implications as specified in Executive Order 13175. It 

would not have a substantial direct effect on one or more Indian tribes, since no tribe has 

developed a TIP that allows it to issue NSR permits. Furthermore, these proposed regulation 

revisions do not affect the relationship or distribution of power and responsibilities between the 

federal government and Indian tribes. The CAA and the Tribal Air Rule establish the relationship 

of the federal government and tribes in developing plans to implement NSR permitting, and this 

proposal does nothing to modify that relationship. Thus, Executive Order 13175 does not apply 

to this action. 

The EPA has concluded that this action will not have tribal implications because it 

doesn’t impose a significant cost to tribal governments. However, there are significant tribal 

interests because of the growth of the oil and gas production industry in Indian country. 

Although Executive Order 13175 does not apply to this action, the EPA has offered consultation 

to tribal officials in developing this action. Meeting summaries will be included in the docket for 

this rulemaking.

The EPA specifically solicits additional comment on this proposed action from tribal 

officials.

G. Executive Order 13045: Protection of Children from Environmental Health and Safety Risks 
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The EPA interprets EO 13045 as applying only to those regulatory actions that concern 

environmental health or safety risks that the EPA has reason to believe may disproportionately 

affect children. This action is not subject to EO 13045 because it is not intended to establish an 

environmental standard intended to mitigate health or safety risks. The proposal requests 

comments on the appropriate definition of a source as it applies to one source category for 

purposes of permitting under the requirements of the CAA. 

H. Executive Order 13211: Actions Concerning Regulations That Significantly Affect Energy 

Supply, Distribution, or Use 

This proposed action is not a “significant energy action” because it is not likely to have a 

significant adverse effect on the supply, distribution or use of energy. We believe this action is 

not likely to have any adverse energy effects because it will not increase, and may decrease, the 

permitting burden on owners and operators of sources in the oil and natural gas sector. 

I. National Technology Transfer and Advancement Act 

Section 12(d) of the National Technology Transfer and Advancement Act of 1995 

(NTTAA), Public Law No. 104-113, section 12(d) (15 U.S.C. 272 note) directs the EPA to use 

voluntary consensus standards in its regulatory activities unless to do so would be inconsistent 

with applicable law or otherwise impractical. Voluntary consensus standards are technical 

standards (e.g., materials specifications, test methods, sampling procedures and business 

practices) that are developed or adopted by voluntary consensus standards bodies. NTTAA 

directs the EPA to provide Congress, through OMB, explanations when the agency decides not 

to use available and applicable voluntary consensus standards. 

This proposed rulemaking does not involve technical standards. Therefore, the EPA is not 

considering the use of any voluntary consensus standards. 
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J. Executive Order 12898: Federal Actions to Address Environmental Justice in Minority 

Populations and Low-Income Populations 

The EPA believes the human health or environmental risk addressed by this proposed 

action will not have disproportionately high and adverse human health or environmental effects 

on minority, low-income populations or indigenous populations. The proposal requests comment 

on the appropriate definition of the source as it applies to one industry category for purposes of 

permitting under the CAA. As such, it does not adversely affect the health or safety of minority 

or low-income populations. The results of this evaluation are contained in Section IV of this 

preamble.

K. Determination Under Section 307(d) 

 Pursuant to sections 307(d)(1)(J) and 307(d)(1)(V) of the CAA, the Administrator 

determines that this action is subject to the provisions of section 307(d). Under section 

307(d)(1)(J), the provisions of section 307(d) apply to revisions to regulations relating to PSD. 

Under section 307(d)(1)(V), the provisions of section 307(d) apply to “such other actions as the 

Administrator may determine.”

Statutory Authority

The statutory authority for this action is provided by sections 101; 111; 114; 116, 160-

165, 169, 173, 301, 302, 501 and 502 of the CAA, as amended (42 U.S.C. 7401; 42 U.S.C. 7411; 

42 U.S.C. 7414; 42 U.S.C. 7416; 7470-7475, 7479, 7503, 7601, 7602, 7661, and 7662. 

List of Subjects

40 CFR Part 51 

 Environmental protection, Air pollution control, Construction permit, Intergovernmental 

relations, Major source, Oil and gas. 
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Page 46 of 57 - Source Determination for Certain Emission Units in the Oil and Natural 

Gas Sector

40 CFR Part 52 

Environmental protection, Air pollution control, Construction permit, Intergovernmental 

relations, Major source, Oil and gas. 

40 CFR Part 70 

 Environmental protection, Air pollution control, Intergovernmental relations, Major 

source, Oil and gas, Operating permit. 

40 CFR Part 71 

Environmental protection, Administrative practice and procedure, Air pollution control, 

Intergovernmental relations, Major source, Operating permit. 

__________________________________ 

Dated: 

__________________________________ 

Gina McCarthy, 

Administrator. 
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For the reasons stated in the preamble, Title 40, Chapter I of the Code of Federal Regulations is 

proposed to be amended as follows. 

PART 51–REQUIREMENTS FOR PREPARATION, ADOPTION AND SUBMITTAL OF 

IMPLEMENTATION PLANS

1. The authority citation for part 51 continues to read as follows: 

Authority: 23 U.S.C. 101; 42 U.S.C. 7401-7671q. 

2. In §51.165: 

revise paragraph (a)(1)(ii) to read as follows:

§51.165 Permit requirements. 

(a) * * * 

(1) * * * 

* * * * * 

[PROPOSED REGULATORY TEXT FOR OPTION 1]

(ii) (A) Building, structure, facility, or installation means all of the pollutant-emitting activities 

which belong to the same industrial grouping, are located on one or more contiguous or adjacent 

properties, and are under the control of the same person (or persons under common control). 

Pollutant emitting activities shall be considered as part of the same industrial grouping if they 

belong to the same Major Group (i.e., which have the same two-digit code) as described in the 

Standard Industrial Classification Manual, 1972, as amended by the 1977 Supplement (U.S. 

Government Printing Office stock numbers 4101-0065 and 003-005-00176-0, respectively). 

(B) Notwithstanding the provisions of paragraph (A) of this section, building, structure, facility, 

or installation means, for onshore activities under SIC Major Group 13: Oil and Gas Extraction, 

all of the pollutant-emitting activities included in Major Group 13 that are located on one or 
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more contiguous or adjacent properties, and are under the control of the same person (or persons 

under common control). Pollutant emitting activities shall be considered adjacent if they are 

located on the same surface site, or on surface sites that are located within 1⁄4 mile of one another, 

where a surface site has the same meaning as in 40 CFR 63.761. 

[PROPOSED REGULATORY TEXT FOR OPTION 2] 

 (ii) (A) Building, structure, facility, or installation means all of the pollutant-emitting activities 

which belong to the same industrial grouping, are located on one or more contiguous or adjacent 

properties, and are under the control of the same person (or persons under common control). 

Pollutant emitting activities shall be considered as part of the same industrial grouping if they 

belong to the same Major Group (i.e., which have the same two-digit code) as described in the 

Standard Industrial Classification Manual, 1972, as amended by the 1977 Supplement (U.S. 

Government Printing Office stock numbers 4101-0065 and 003-005-00176-0, respectively). 

(B) Notwithstanding the provisions of paragraph (A) of this section, building, structure, facility, 

or installation means, for onshore activities in SIC Major Group 13: Oil and Gas Extraction, all 

of the pollutant-emitting activities included in Major Group 13, are located on one or more 

contiguous or adjacent properties, and are under the control of the same person (or persons under 

common control). Pollutant-emitting activities shall be considered adjacent if one of the 

following circumstances apply: 1) the pollutant-emitting activities are separated by a distance of 

1⁄4 mile or more and there is an exclusive functional interrelatedness; or 2) the pollutant-emitting 

activities are separated by a distance of less than 1⁄4 mile.

* * * * * 
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3. In §51.166, 

revise paragraph (b)(6) to read as follows: 

§51.166 Prevention of significant deterioration of air quality. 

* * * *

(b) * * * 

* * * * * 

[PROPOSED REGULATORY TEXT FOR OPTION 1]

(6) (i) Building, structure, facility, or installation means all of the pollutant-emitting activities 

which belong to the same industrial grouping, are located on one or more contiguous or adjacent 

properties, and are under the control of the same person (or persons under common control) 

except the activities of any vessel. Pollutant-emitting activities shall be considered as part of the 

same industrial grouping if they belong to the same Major Group (i.e., which have the same twodigit code) as described in the Standard Industrial Classification Manual, 1972, as amended by 

the 1977 Supplement (U.S. Government Printing Office stock numbers 4101-0066 and 003-005-

00176-0, respectively). 

(ii) Notwithstanding the provisions of paragraph (i) of this section, building, structure, facility, 

or installation means, for onshore activities under SIC Major Group 13: Oil and Gas Extraction, 

all of the pollutant-emitting activities included in Major Group 13 that are located on one or 

more contiguous or adjacent properties, and are under the control of the same person (or persons 

under common control). Pollutant emitting activities shall be considered adjacent if they are 
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located on the same surface site, or on surface sites that are located within 1⁄4 mile of one another, 

where a surface site has the same meaning as in 40 CFR 63.761. 

[PROPOSED REGULATORY TEXT FOR OPTION 2] 

(6) (i) Building, structure, facility, or installation means all of the pollutant-emitting activities 

which belong to the same industrial grouping, are located on one or more contiguous or adjacent 

properties, and are under the control of the same person (or persons under common control) 

except the activities of any vessel. Pollutant-emitting activities shall be considered as part of the 

same industrial grouping if they belong to the same Major Group (i.e., which have the same twodigit code) as described in the Standard Industrial Classification Manual, 1972, as amended by 

the 1977 Supplement (U.S. Government Printing Office stock numbers 4101-0066 and 003-005-

00176-0, respectively). 

(ii) Notwithstanding the provisions of paragraph (i) of this section, building, structure, facility, 

or installation means, for onshore activities in SIC Major Group 13: Oil and Gas Extraction, all 

of the pollutant-emitting activities included in Major Group 13, are located on one or more 

contiguous or adjacent properties, and are under the control of the same person (or persons under 

common control). Pollutant-emitting activities shall be considered adjacent if one of the 

following circumstances apply: 1) the pollutant-emitting activities are separated by a distance of 

1⁄4 mile or more and there is an exclusive functional interrelatedness; or 2) the pollutant-emitting 

activities are separated by a distance of less than 1⁄4 mile.

* * * * * 

4. In appendix S to part 51, 

revise section A.2 to read as follows: 
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APPENDIX S TO PART 51 – EMISSION OFFSET INTERPRETATIVE RULING

* * * * * 

II. * * * INITIAL SCREENING ANALYSES AND DETERMINATION OF APPLICABLE REQUIREMENTS

A. * * * 

* * * * * 

[PROPOSED REGULATORY TEXT FOR OPTION 1]

2. (i) Building, structure, facility or installation means all of the pollutant-emitting activities 

which belong to the same industrial grouping, are located on one or more contiguous or adjacent 

properties, and are under the control of the same person (or persons under common control) 

except the activities of any vessel. Pollutant-emitting activities shall be considered as part of the 

same industrial grouping if they belong to the same “Major Group” (i.e., which have the same 

two digit code) as described in the Standard Industrial Classification Manual, 1972, as amended 

by the 1977 Supplement (U.S. Government Printing Office stock numbers 4101-0066 and 003-

005-00176-0, respectively). 

(ii) Notwithstanding the provisions of paragraph (i) of this section, building, structure, facility or 

installation means, for onshore activities under SIC Major Group 13: Oil and Gas Extraction, all 

of the pollutant-emitting activities included in Major Group 13 that are located on one or more 

contiguous or adjacent properties, and are under the control of the same person (or persons under 

common control). Pollutant emitting activities shall be considered adjacent if they are located on 

the same surface site, or on surface sites that are located within 1⁄4 mile of one another, where a 

surface site has the same meaning as in 40 CFR §63.761. 

[PROPOSED REGULATORY TEXT FOR OPTION 2] 
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2. (i) Building, structure, facility or installation means all of the pollutant-emitting activities 

which belong to the same industrial grouping, are located on one or more contiguous or adjacent 

properties, and are under the control of the same person (or persons under common control) 

except the activities of any vessel. Pollutant-emitting activities shall be considered as part of the 

same industrial grouping if they belong to the same “Major Group” (i.e., which have the same 

two digit code) as described in the Standard Industrial Classification Manual, 1972, as amended 

by the 1977 Supplement (U.S. Government Printing Office stock numbers 4101-0066 and 003-

005-00176-0, respectively). 

(ii) Notwithstanding the provisions of paragraph (i) of this section, building, structure, facility or 

installation means, for onshore activities in SIC Major Group 13: Oil and Gas Extraction, all of 

the pollutant-emitting activities included in Major Group 13, are located on one or more 

contiguous or adjacent properties, and are under the control of the same person (or persons under 

common control). Pollutant-emitting activities shall be considered adjacent if one of the 

following circumstances apply: 1) the pollutant-emitting activities are separated by a distance of 

1⁄4 mile or more and there is an exclusive functional interrelatedness; or 2) the pollutant-emitting 

activities are separated by a distance of less than 1⁄4 mile.

* * * * * 

PART 52–APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS

5. The authority citation for part 52 continues to read as follows: 

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

6. In §52.21, 

revise paragraph (b)(6) to read as follows: 

§52.21 Prevention of significant deterioration of air quality. 
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Page 53 of 57 

* * * * * 

(b) * * * 

* * * * * 

[PROPOSED REGULATORY TEXT FOR OPTION 1] 

(6) (i) Building, structure, facility, or installation means all of the pollutant-emitting activities 

which belong to the same industrial grouping, are located on one or more contiguous or adjacent 

properties, and are under the control of the same person (or persons under common control) 

except the activities of any vessel. Pollutant-emitting activities shall be considered as part of the 

same industrial grouping if they belong to the same “Major Group” (i.e., which have the same 

first two digit code) as described in the Standard Industrial Classification Manual, 1972, as 

amended by the 1977 Supplement (U.S. Government Printing Office stock numbers 4101-0066 

and 003-005-00716-0, respectively. 

(ii) Notwithstanding the provisions of paragraph (i) of this section, building, structure, facility, 

or installation means, for onshore activities under SIC Major Group 13: Oil and Gas Extraction, 

all of the pollutant-emitting activities included in Major Group 13 that are located on one or 

more contiguous or adjacent properties, and are under the control of the same person (or persons 

under common control). Pollutant emitting activities shall be considered adjacent if they are 

located on the same surface site, or on surface sites that are located within 1⁄4 mile of one another, 

where a surface site has the same meaning as in 40 CFR 63.761. 

[PROPOSED REGULATORY TEXT FOR OPTION 2] 

(6) (i) Building, structure, facility, or installation means all of the pollutant-emitting activities 

which belong to the same industrial grouping, are located on one or more contiguous or adjacent 

properties, and are under the control of the same person (or persons under common control) 
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except the activities of any vessel. Pollutant-emitting activities shall be considered as part of the 

same industrial grouping if they belong to the same “Major Group” (i.e., which have the same 

first two digit code) as described in the Standard Industrial Classification Manual, 1972, as 

amended by the 1977 Supplement (U.S. Government Printing Office stock numbers 4101-0066 

and 003-005-00716-0, respectively. 

(ii) Notwithstanding the provisions of paragraph (i) of this section, building, structure, facility, 

or installation means, for onshore activities in SIC Major Group 13: Oil and Gas Extraction, all 

of the pollutant-emitting activities included in Major Group 13, are located on one or more 

contiguous or adjacent properties, and are under the control of the same person (or persons under 

common control). Pollutant-emitting activities shall be considered adjacent if one of the 

following circumstances apply: 1) the pollutant-emitting activities are separated by a distance of 

1⁄4 mile or more and there is an exclusive functional interrelatedness; or 2) the pollutant-emitting 

activities are separated by a distance of less than 1⁄4 mile.

* * * * * 

PART 70 – STATE OPERATING PERMIT PROGRAMS

7. The authority citation for part 70 continues to read as follows: 

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

8. In §70.2, revise the definition for “Major source,” to read as follows:

§ 70.2 Definitions. 

* * * * *

[PROPOSED REGULATORY TEXT FOR OPTION 1] 

Major source means any stationary source (or any group of stationary sources that are located on 

one or more continuous or adjacent properties, and are under common control of the same person 
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(or persons under common control)) belonging to a single major industrial grouping and that are 

described in paragraph (1), (2), or (3) of this definition. For the purposes of defining “major 

source,” a stationary source or group of stationary sources shall be considered part of a single 

industrial grouping if all of the pollutant emitting activities at such source or group of sources on 

contiguous or adjacent properties belong to the same Major Group (i.e., all have the same twodigit code) as described in the Standard Industrial Classification Manual, 1987. For onshore 

activities belonging to SIC Major Group 13: Oil and Gas Extraction, pollutant emitting activities 

shall be considered adjacent if they are located on the same surface site, or are on surface sites 

that are located within 1⁄4 mile of one another, where a surface site has the same meaning as in 40 

CFR 63.761. 

[PROPOSED REGULATORY TEXT FOR OPTION 2] 

Major source means any stationary source (or any group of stationary sources that are located on 

one or more continuous or adjacent properties, and are under common control of the same person 

(or persons under common control)) belonging to a single major industrial grouping and that are 

described in paragraph (1), (2), or (3) of this definition. For the purposes of defining “major 

source,” a stationary source or group of stationary sources shall be considered part of a single 

industrial grouping if all of the pollutant emitting activities at such source or group of sources on 

contiguous or adjacent properties belong to the same Major Group (i.e., all have the same twodigit code) as described in the Standard Industrial Classification Manual, 1987. For onshore 

activities belonging to SIC Major Group 13: Oil and Gas Extraction, pollutant emitting activities 

shall be considered adjacent if one of the following circumstances apply: 1) the pollutantemitting activities are separated by a distance of 1⁄4 mile or more and there is an exclusive 
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functional interrelatedness; or 2) the pollutant-emitting activities are separated by a distance of 

less than 1⁄4 mile. 

* * * * * 

PART 71 – FEDERAL OPERATING PERMIT PROGRAMS

9. The authority citation for part 71 continues to read as follows: 

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

9. In § 71.2, subpart A, under the definition of “Major sources,” revise the definition to read as 

follows: 

Subpart A – Operating Permits

10. In §71.2, revise the definition for “Major sources” to read as follows. 

§71.2 Definitions 

* * * * * 

[PROPOSED REGULATORY TEXT FOR OPTION 1] 

Major source means any stationary source (or any group of stationary sources that are located on 

one or more contiguous or adjacent properties, and are under common control of the same person 

(or persons under common control)), belonging to a single major industrial grouping and that are 

described in paragraph (1), (2), or (3) of this definition. For the purposes of defining “major 

source,” a stationary source or group of stationary sources shall be considered part of a single 

industrial grouping if all of the pollutant emitting activities at such source or group of sources on 

contiguous or adjacent properties belong to the same Major Group (i.e., all have the same twodigit code) as described in the Standard Industrial Classification Manual, 1987. For onshore 

activities belonging to SIC Major Group 13: Oil and Gas Extraction, pollutant emitting activities 

shall be considered adjacent if they are located on the same surface site, or are on surface sites 
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that are located within 1⁄4 mile of one another, where a surface site has the same meaning as in 40 

CFR 63.761. 

[PROPOSED REGULATORY TEXT FOR OPTION 2] 

Major source means any stationary source (or any group of stationary sources that are located on 

one or more contiguous or adjacent properties, and are under common control of the same person 

(or persons under common control)), belonging to a single major industrial grouping and that are 

described in paragraph (1), (2), or (3) of this definition. For the purposes of defining “major 

source,” a stationary source or group of stationary sources shall be considered part of a single 

industrial grouping if all of the pollutant emitting activities at such source or group of sources on 

contiguous or adjacent properties belong to the same Major Group (i.e., all have the same twodigit code) as described in the Standard Industrial Classification Manual, 1987. For onshore 

activities belonging to SIC Major Group 13: Oil and Gas Extraction, pollutant emitting activities 

shall be considered adjacent if one of the following circumstances apply: 1) the pollutantemitting activities are separated by a distance of 1⁄4 mile or more and there is an exclusive 

functional interrelatedness; or 2) the pollutant-emitting activities are separated by a distance of 

less than 1⁄4 mile. 

* * * * *