***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 1 of 142 6560-50-P ENVIRONMENTAL PROTECTION AGENCY 40 CFR Parts 51 and 52 [EPA-HQ-OAR-2015-0531; FRL-9935-27-OAR] RIN 2060-AS55 Protection of Visibility: Amendments to Requirement s for State Plans AGENCY: Environmental Protection Agency (EPA). ACTION: Proposed rule. SUMMARY: The Environmental Protection Agency (EPA) is propo sing amendments to requirements under the Clean Air Act (CAA) for stat e plans for protection of visibility in mandatory Class I federal areas (Class I areas) in order to continue steady environmental progress while addressing administrative aspects of the program. The EPA amendments would clarify the relationship between long-term strategi es and reasonable progress goals in state plans, and the long-term strategy obligation of all states . The amendments would also change the way in which some days during each year are to be selec ted for purposes of tracking progress towards natural visibility conditions to account for events such as wildfires; change aspects of the requirements for the content of progress reports; u pdate, simplify and extend to all states the provisions for reasonably attributable visibility i mpairment and revoke existing federal implementation plans (FIPs) that require the EPA to assess and address any existing reasonably attributable visibility impairment situations in so me states; and add a requirement for states to consult with Federal Land Managers (FLMs) earlier i n the development of state plans. The EPA also proposes to address administrative aspects of the program by making a one-time adjustment***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 2 of 142 to the due date for the next state implementation p lans (SIPs), revising the due dates for progress reports and removing the requirement for progress r eports to be SIP revisions. DATES: Comments. Written comments on this proposal must be received on or before [INSERT DATE 60 DAYS AFTER DATE OF PUBLICATION IN T HE FEDERAL REGISTER]

. Public hearing . The EPA is holding a public hearing concerning th e proposed rule on April 26, 2016, in Washington, D.C. The last day to pre-register to speak at the hearing is April 22, 2016. Please refer to SUPPLEMENTARY INFORMATION for additional information on submitting comments and the public h earing. Information collection request

. Under the Paperwork Reduction Act (PRA), comments o n the information collection provisions are best assured of having full effect if the Offic e of Management and Budget (OMB) receives a copy of your comments on or before [INSERT DATE 30 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. ADDRESSES: Comments: Submit your comments, identified by Docket ID No. EPA-HQOAR-2015-0531, at http://www.regulations.gov . Follow the online instructions for submitting comments. Once submitted, comments cannot be edited or removed from Regulations.gov. The EPA may publish any comment received to its public docket. Do not submit electronically any information you consider to be Confidential Busines s Information (CBI) or other information whose disclosure is restricted by statute. Multimed ia submissions (audio, video, etc.) must be accompanied by a written comment. The written comme nt is considered the official comment and should include discussion of all points you wis h to make. The EPA will generally not consider comments or comment contents located outsi de of the primary submission (i.e., on the web, cloud, or other file sharing system). For addi tional submission methods, the full EPA public comment policy, information about CBI or multimedia submissions and general guidance on***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 3 of 142 making effective comments, please visit http://www2.epa.gov/dockets/comments.html

. Public hearing: A public hearing will be held at William Jefferson Clinton East building (WJC East), room 1153, in Washington, D.C. Identification is re quired. If your driver’s license is issued by American Samoa, Illinois or Missouri, you must pres ent an additional form of identification to enter. Enhanced driver’s licenses from Minnesota an d Washington are acceptable. Please refer to SUPPLEMENTARY INFORMATION for additional information on the public hearing a nd location requirements. FOR FURTHER INFORMATION CONTACT: For general information on this proposed rule and ICR, contact Mr. Christopher Werner, Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, by phone at (919) 541-5133 or by email at werner.christopher@epa.gov ; or Ms. Rhea Jones, Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, by phone at ( 919) 541-2940 or by email at jones.rhea@epa.gov . For information on the public hearing or to regis ter to speak at the hearing, contact Ms. Pamela Long, Office of Air Quality Plan ning and Standards, U.S. Environmental Protection Agency, by phone at (919) 541-0641 or by email at long.pam@epa.gov

. SUPPLEMENTARY INFORMATION: I. General Information A. Preamble Glossary of Terms and Acronyms The following are abbreviations of terms used in t his document. AQRV Air quality related value BART Best available retrofit technology b ext Light extinction CAA Clean Air Act CFR Code of Federal Regulations EGU Electric generating unit EPA Environmental Protection Agency***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 4 of 142 FIP Federal implementation plan FLM or FLMs Federal Land Manager or Managers ICR Information collection request IMPROVE Interagency monitoring of protected visual environments NAAQS National ambient air quality standards NO x Nitrogen oxides OMB Office of Management and Budget PM Particulate matter PM 2.5 Particulate matter equal to or less than 2.5 micron s in diameter (fine

particulate matter) PM 10 Particulate matter equal to or less than 10 micr ons in diameter PRA Paperwork Reduction Act PSD Prevention of significant deterioration RPO Regional planning organization SIP State implementation plan SO 2 Sulfur dioxide TAR Tribal Authority Rule URP Uniform rate of progress B. Does this action apply to me? Entities potentially affected directly by this prop osed rule include state, local and tribal 1 governments, as well as FLMs responsible for protec tion of visibility in mandatory Class I areas. Entities potentially affected indirectly by this pr oposed rule include owners and operators of sources that emit particulate matter equal to or le ss than 10 microns in diameter (PM 10 )

, particulate matter equal to or less than 2.5 micron s in diameter (PM 2.5 or fine PM), sulfur dioxide (SO 2 ), oxides of nitrogen (NO x ), volatile organic compounds and other pollutants that may cause

1 The Regional Haze Rule may apply, as appropriate u nder the Tribal Authority Rule (TAR) in 40 CFR part 49, to an Indian tribe that receives a determination of eligibility for treatment as a state for purposes of administering a tribal visibi lity protection program under section 169A of the CAA. No tribe has applied for such status, and so at present the EPA is responsible for implementation of the Regional Haze Rule in areas o f tribal authority. This responsibility includes, but is not limited to, implementation of the reasonable progress requirements of 40 CFR 51.308(f) in instances where potentially affect ed sources are located on tribal land, as necessary or appropriate. The proposed rule changes may impact the development and approvability of tribal implementation plans that t ribes may wish to develop in the future. We encourage states to provide outreach and engage in discussions with tribes about their regional haze SIPs as they are being developed.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 5 of 142 or contribute to visibility impairment. Others pote ntially affected indirectly by this proposed rule include members of the general public who live, wor k or recreate in mandatory Class I areas affected by visibility impairment. Because emission sources that contribute to visibility impairment in Class I areas also may contribute to air pollution in other areas, members of the general public may also be affected by this propose d rulemaking. C. What should I consider as I prepare my comments for the EPA? When submitting comments, remember to:

• Identify the rulemaking docket by docket number and other identifying information (subject heading, Federal Register date and page number).

• Follow directions. The proposed rule may ask you to respond to specific questions or organize comments by referencing a Code of Feder al Regulations (CFR) part or section number.

• Explain why you agree or disagree, suggest alternat ives and substitute language for your requested changes.

• Describe any assumptions and provide any technical information and/or data that you used to support your comment.

• 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 concer ns wherever possible, 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 pe riod deadline identified.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 6 of 142 Please note that this is a narrow proposed rulemak ing. Please focus your comments on only those sections of the CFR affected by our prop osed changes. D. What information should I know about the public hearing? The April 26, 2016 public hearing will be held to a ccept oral comments on this proposed rulemaking. The hearing will be held at the U.S. En vironmental Protection Agency, William Jefferson Clinton East Building (WJC East), Room 11 53, 1201 Constitution Avenue, NW, Washington, D.C. It will convene at 9:00 a.m. and c ontinue until the earlier of 5:00 p.m. or 1 hour after the last registered speaker has spoken. We have scheduled a lunch break from 12:00 to 1:00 p.m. People interested in presenting oral test imony should contact Ms. Pamela Long, Air Quality Planning Division, Office of Air Quality Pl anning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711 , telephone (919) 541-0641, fax number (919) 541-5509, email address long.pam@epa.gov , at least 2 days in advance of the public hearing ( see DATES ). Additionally, requests to speak will be taken th e day of the hearing at the hearing registration desk, although preferences on speaking times may not be able to be fulfilled. Depending on the flow of the day, times may fluctua te. People interested in attending the public hearing should also call Ms. Long to verify the tim e, date and location of the hearing. While the EPA expects the hearing to go forward as set forth, we ask that you monitor our website at http://www.epa.gov/visibilityor contact Ms. Pamela Long to determine if there are any updates to the information on the hearing. Oral testimony will be limited to 5 minutes for eac h 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 hea ring.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 7 of 142 The EPA may ask clarifying questions during the ora l presentations, but will not respond to the presentations at that time. Written statemen ts 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. Verbat im transcripts of the hearing and written statements will be included in the docket for the r ulemaking. Because this hearing is being held at United States (U.S.) government facilities, individuals planning to attend the hearing should b e prepared to show valid picture identification to the security staff in order to gain access to th e meeting room. Please note that the REAL ID Act, passed by Congress in 2005, established new re quirements for entering federal facilities. If your driver’s license is issued by American Samoa, Illinois or Missouri, you must present an additional form of identification to enter the fede ral building. Enhanced driver’s licenses from Minnesota and Washington are acceptable. Acceptable alternative forms of identification include: federal employee badges, passports, enhanc ed driver’s licenses, and military identification cards. For additional information fo r 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 th e security desk. No large signs will be allowed in the building, cameras may only be used outside o f the building, and demonstrations will not be allowed on federal property for security reasons. Attendees may be asked to go through metal detector s. 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 screen ing; avoid shoes with metal shanks, toe***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 8 of 142 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 or drugs or dru g paraphernalia will be allowed in the building. We recommend that you arrive 20 minutes i n advance of your speaking time to allow time to go through security and to check in with th e registration desk. E. Where can I obtain a copy of this document and o ther related information? In addition to being available in the docket, an el ectronic copy of this Federal Register document will be posted at http://www.epa.gov/visibility

. F. How is this Federal Register document organized? The information presented in this document is organ ized as follows: I. General Information A. Preamble Glossary of Terms and Acronyms B. Does this action apply to me? C. What should I consider as I prepare my comments for the EPA? D. What information should I know about the public hearing? E. Where can I obtain a copy of this document and o ther related information? F. How is this Federal Register document organized? II. What action is the EPA proposing to take? III. What is the background for the EPA’s proposed action? A. Reasonably Attributable Visibility Impairment B. Regional Haze 1. Requirements of the 1990 CAA Amendments and the EPA’s Regional Haze Rule 2. Roles of Agencies in Addressing Regional Haze 3. Requirements for the Regional Haze SIPs 4. Requirements for the Regional Haze Progress Repo rts 5. Tribes and Regional Haze C. Air Permitting IV. Proposed Rule Changes A. Clarifications to Reflect the EPA’s Long-Standing I nterpretation of the Relationship Between Long-Term Strategies and Reasonable Progres s Goals B. Other Clarifications and Changes to Requirements fo r Periodic Comprehensive Revisions of Implementation Plans C. Changes to Definitions and Terminology Related to H ow Days Are Selected for Tracking Progress***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 9 of 142 D. Impacts on Visibility from Anthropogenic Sources Ou tside the U.S. E. Impacts on Visibility from Wildland Fires Within th e U.S. F. Clarification of and Changes to the Required Conten t of Progress Reports G. Changes to Reasonably Attributable Visibility Impai rment Provisions H. Consistency Revisions Related to Permitting of New and Modified Major Sources I. Changes to FLM Consultation Requirements J. Extension of Next Regional Haze SIP Deadline from 2 018 to 2021 K. Changes to Scheduling of Regional Haze Progress Rep orts L. Changes to the Requirement that Regional Haze Progr ess Reports be SIP Revisions M. Changes to Requirements Related to the Grand Canyon Visibility Transport Commission V. Environmental Justice Considerations VI. Statutory and Executive Order Reviews A. Executive Order 12866: Regulatory Planning and R eview and Executive Order 13563: Improving Regulation and Regulatory Review B. Paperwork Reduction Act (PRA) C. Regulatory Flexibility Act (RFA) D. Unfunded Mandates Reform Act (UMRA) E. Executive Order 13132: Federalism F. Executive Order 13175: Consultation and Coordina tion with Indian Tribal Governments G. Executive Order 13045: Protection of Children fr om Environmental Health and Safety Risks H. Executive Order 13211: Actions Concerning Regula tions That Significantly Affect Energy Supply, Distribution or Use I. National Technology Transfer and Advancement Act J. Executive Order 12898: Federal Actions to Addres s Environmental Justice in Minority Populations and Low-Income Populations VII. Statutory Authority II. What action is the EPA proposing to take? The EPA is proposing changes to the requirements th at states (and, if applicable, tribes) would have to meet as they implement programs for t he protection of visibility in mandatory***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 10 of 142 Class I areas. 2 This proposal would support continued environmenta l progress by clarifying certain or revising existing regulatory provisions and removing older rule provisions that have been superseded by subsequent developments. The EPA is proposing to clarify the relationship between long-term strategies and reasonable progres s goals in state plans and the long-term strategy obligation of all states. The EPA is also proposing to revise the way in which some days during each year are to be selected for purposes of tracking progress towards natural visibility conditions in order to focus attention on days when anthropogenic emissions impair visibility; revise aspects of the requirements for the content of progress reports; update, simplify and extend to all states the provisions for reasonably attributable visibility impairment and revoke existing FIPs that require the EPA to assess and ad dress any existing reasonably attributable visibility impairment situations in some states; an d add a requirement for states to consult with FLMs earlier in the development of state plans. Oth er changes address administrative aspects of the program in order to reduce unnecessary burden. Specifically, the EPA proposes to make a one-time adjustment to the due date for the next SI Ps (from 2018 to 2021, which would help states to coordinate regional haze planning with th at for other programs), to revise the due dates for progress reports and to remove the requirement for progress reports to be SIP revisions. All

2 Areas designated as mandatory Class I areas consis t of national parks exceeding 6,000 acres, wilderness areas and national memorial parks exceed ing 5,000 acres, and all international parks that were in existence on August 7, 1977. 42 U.S.C. 7472(a). In accordance with section 169A of the CAA, the EPA, in consultation with the Departme nt of Interior, promulgated a list of 156 areas where visibility is identified as an importan t value. 44 FR 69122 (November 30, 1979). The extent of a mandatory Class I area includes sub sequent changes in boundaries, such as park expansions. 42 U.S.C. 7472(a). Although states and tribes may designate as Class I additional areas that they consider to have visibility as an i mportant value, the requirements of the visibility program set forth in section 169A of the CAA apply only to “mandatory Class I Federal areas.” Each mandatory Class I federal area is the responsi bility of a “Federal Land Manager.” 42 U.S.C. 7602(i). When we use the term “Class I area” in this action, we mean any one of the 156 “mandatory Class I Federal areas” where visibility has been identified as an important value.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 11 of 142 of these changes would apply to periodic comprehens ive state implementation plans developed for the second and subsequent implementation period s and for progress reports submitted subsequent to those plans. We do not intend the pro posed changes to affect the development of state plans for the first implementation period or the first progress reports due under the existing Regional Haze Rule. The EPA is proposing these changes for several reas ons, as described more fully in the descriptions of each change detailed later in this proposed action. The proposed clarifications regarding the relationship between reasonable progr ess goals, long-term strategies and the longterm strategy obligation of all states reflect long -standing EPA interpretation of the Regional Haze Rule and are intended to ensure consistent (an d appropriate) understanding of these requirements as states prepare their plans for the second implementation period. Changes to FLM consultation requirements would help ensure that th e expertise and perspective of these officials are brought into the state plan development process earlier, so that they contribute meaningfully during the state’s technical analysis and deliberat ions. The proposals related to how days are selected for visibility progress tracking would pro vide the public and state officials more meaningful information on how existing and potentia l new emission reduction measures are contributing or could contribute to reasonable prog ress in reducing man-made visibility impairment, by greatly reducing the trend-distortin g effect of wildfires and natural dust storms. Collectively, these changes would serve to strength en the regional haze program based upon lessons learned during the decade and a half since the program’s inception. With regard to the proposed extension of the curren t deadline of July 31, 2018, to July 31, 2021, for states’ comprehensive SIP revisions f or the second implementation period, the EPA believes this one-time change would benefit states by allowing them to obtain and take into***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 12 of 142 account information on the effects of a number of o ther regulatory programs that will be affecting sources over the next several years. The change would also allow states to develop SIP revisions for the second implementation period that are more integrated with state planning for these other programs, an advantage that was widely confirmed in discussions with states and that is anticipated to result in greater environmental p rogress than if planning for these multiple programs were not as well integrated. The end date for the second implementation period remains 2028; that is, the focus of state planning would be emission reduction measures that should be underway by 2028, as required by the curr ent rule. Other than the proposed one-time change to the next due date for periodic comprehens ive SIP revisions (i.e., for those currently due in 2018), no change is being proposed for due d ates for future periodic comprehensive SIP revisions. The proposed changes related to progress reports a re intended to make the timing of progress reports more useful as mid-course reviews, to clarify the required content of progress reports for aspects on which there has been some am biguity, and to allow states to conserve their administrative resources and make progress reports more timely by removing the requirement that they be submitted as formal SIP revisions. We are proposing to retain a requirement that states consult with FLMs on their progress reports, and that states offer the public an opportunity to comment on progress reports before they are fina lized, which are two of the steps that apply now to progress reports that are SIP revisions and which will help ensure ongoing accountability for progress reports. Finally, the current provisions related to reasonab ly attributable visibility impairment require a recurring process of assessment and plann ing by the states. Experience since the current provisions were promulgated suggests that situation s involving reasonably attributable visibility***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 13 of 142 impairment occur infrequently and therefore that an “as needed” approach for initiating a state planning obligation would be more efficient in the use of resources. The EPA is proposing to replace the recurring process of assessment of reas onably attributable visibility impairment with an as-needed approach, and given our increased unde rstanding of the interstate nature of visibility impairment, to expand the applicability for reasonably attributable visibility impairment from only states with Class I areas to a ll states. The proposed change to an as-needed approach only applies to reasonably attributable vi sibility impairment; periodic planning for purposes of regional haze will continue. This would improve visibility protection, if a situation exists or arises in which a source in a state witho ut any Class I area causes reasonably attributable visibility impairment at a Class I are a in another state. The EPA also intends to provide states with update d guidance on the development of regional haze SIPs, in consultation with the states and FLMs, separately from this rulemaking. The guidance will assist states as they refocus on reasonable progress analyses for the next regional haze implementation period ending in 2028. We expect to invite public comment on a draft of this new guidance, and we expect to receiv e and be able to consider those comments before we finalize the Regional Haze Rule revisions

. III. What is the background for the EPA’s proposed action? A. Reasonably Attributable Visibility Impairment In section 169A of the 1977 Amendments to the CAA, Congress created a program for protecting visibility in the nation’s national park s, wilderness areas and other Class I areas due to their “great scenic importance.” 3 This section of the CAA establishes as a national goal the

3 H.R. Rep. No. 294, 95th Cong. 1st Sess. at 205 (19 77).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 14 of 142 “prevention of any future, and the remedying of any existing, impairment of visibility in mandatory Class I Federal areas which impairment re sults from manmade air pollution.” In 1980, the EPA promulgated regulations to address visibility impairment in Class I areas, including but not limited to impairment that is “reasonably attributable” to a single source or small group of sources, i.e., “reasonably attrib utable visibility impairment.” 45 FR 80084 (December 2, 1980). These regulations, codified at 40 CFR 51.300 through 51.307, represented the first phase in addressing visibility impairment from existing sources. They also addressed potential visibility and other air quality-related impacts from new and modified major sources already subject to permitting requirements for purp oses of protection of the National Ambient Air Quality Standards (NAAQS) and preventing signif icant deterioration of air quality. The EPA explicitly deferred action on regional haze (visibi lity-impairing pollution that is caused by the emission of air pollutants from numerous sources lo cated over a wide geographic area) until some future date when improvement in monitoring tec hniques provided more data on sourcespecific levels of visibility impairment, regional scale models became refined, and our scientific knowledge about the relationships between emitted a ir pollutants and visibility impairment improved. It is important to note that not all states were su bject to the 1980 reasonably attributable visibility impairment requirements. Under the 1980 rules, the 35 states and one territory (Virgin Islands) containing Class I areas were required to submit SIPs addressing reasonably attributable visibility impairment. The 1980 rules required stat es to (1) develop, adopt, implement and evaluate long-term strategies for making reasonable progress toward remedying existing and preventing future impairment in the mandatory Class I areas through their SIP revisions; (2) adopt certain measures to assess potential visibili ty impacts due to new or modified major***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 15 of 142 stationary sources, including measures to notify FL Ms of proposed new source permit applications, and to consider visibility analyses c onducted by FLMs in their new source permitting decisions; (3) conduct visibility monito ring in mandatory Class I areas, and (4) revise their SIPs at 3-year intervals to assure reasonable progress toward the national visibility goal. In addition, the 1980 regulations provide that an FLM may certify to a state at any time that visibility impairment at a Class I area is reasonab ly attributable to a single source or small group of sources. Following such a certification by an FL M, a state is required to address the requirements for best available retrofit technology (BART) for BART-eligible sources considered to be contributing to reasonably attribu table visibility impairment. Also, the appropriate control of any source certified by an F LM, whether BART-eligible or not, would be specifically addressed in the long-term strategy fo r making reasonable progress toward the national goal of natural visibility conditions. See §51.302(c)(2)(i). In practice, the 1980 rules resulted in few SIPs be ing submitted by states and approved by the EPA, requiring the EPA to develop and apply FIP s to those states that failed to submit an approvable reasonably attributable visibility impai rment SIP. 52 FR 45132 (November 24, 1987). Most of these FIPs contain planning requirem ents only, i.e., most of the FIPs merely commit the EPA to assessing on a 3-year cycle wheth er reasonably attributable visibility impairment is occurring and to adopting an appropri ate strategy of required emission controls if it is. We are proposing extensive changes to the existing provisions regarding reasonably attributable visibility impairment to improve coord ination with the regional haze program requirements and enhance the potential for environm ental protection, as described in the “Proposed Rule Changes” section of this document (s ection IV.G).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 16 of 142 B. Regional Haze Regional haze is visibility impairment that is prod uced by a multitude of sources and activities that are located across a broad geograph ic area and emit PM 10 , PM 2.5 (e.g., sulfates, nitrates, organic carbon, elemental carbon and soil dust) and their precursors (e.g., SO 2 , NOx and, in some cases, ammonia and volatile organic co mpounds). Fine particle precursors react in the atmosphere to form PM 2.5 , which impairs visibility by scattering and absorb ing light. This light scattering reduces the clarity, color and vis ible distance that one can see. Particulate matter can also cause serious health effects in humans (in cluding premature death, heart attacks, irregular heartbeat, aggravated asthma, decreased l ung function and increased respiratory symptoms) and contribute to environmental effects s uch as acid deposition and eutrophication. Data from the existing visibility monitoring networ k, the “Interagency Monitoring of Protected Visual Environments” (IMPROVE) monitoring network, show that at the time the Regional Haze Rule was finalized in 1999, visibilit y impairment caused by air pollution occurred virtually all the time at most national park and wi lderness areas. The average visual range 4 in many Class I areas in the western U.S. was 62–93 mi les, but in some Class I areas, these visual ranges may have been impacted by natural wildfire a nd dust episodes in addition to anthropogenic impacts. In most of the eastern Class I areas of the U.S., the average visual range was less than 19 miles. 64 FR 35715 (July 1, 1999).

4 Visual range is the greatest distance, in kilomete rs or miles, at which a dark object can be discerned against the sky by a typical observer. Vi sual range is inversely proportional to light extinction (b ext ) by particles and gases and is calculated as: Visu al Range = 3.91/b ext (Bennett, M.G., The physical conditions controlling visibilit y through the atmosphere; Quarterly Journal of the Royal Meteorological Society, 1930, 56, 1-29). Light extinction has units of inverse distance (i.e., Mm -1 or inverse Megameters [mega = 10 6 ]).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 17 of 142 Based on visibility data through 2014, considerable visibility improvements (4 to 7 deciviews) 5 have been made in eastern Class I areas on the 20 percent haziest days. Some western Class I areas have also experienced visibil ity improvements on the 20 percent haziest days (1 to 4 deciviews). However, in some areas, su ch as Sawtooth Wilderness area in Idaho, improvements from reduced emissions from man-made s ources have been overwhelmed by impacts from wildfire and/or dust events. There are also some western areas where visibility has changed only by a slight amount. 1. Requirements of the 1990 CAA Amendments and the EPA’s Regional Haze Rule Congress added section 169B to the CAA in 1990 to a ddress regional haze issues. Among other things, this section included provision s for the EPA to conduct visibility research on regional regulatory tools with the National Park Service and other federal agencies, and to provide periodic reports to Congress on visibility improvements due to implementation of other air pollution protection programs. Section 169B als o generally allowed the Administrator to establish visibility transport commissions and spec ifically required the Administrator to establish a commission for the Grand Canyon area. The EPA pro mulgated a rule to address regional haze in 1999. 64 FR 35714 (July 1, 1999). The 1999 Regio nal Haze Rule established a more comprehensive visibility protection program for Cla ss I areas. The requirements for regional haze are found at 40 CFR 51.308 and 51.309.

5 The deciview haze index (discussed in more detail in Section III.B.3) is logarithmically related to light extinction and is used by the regional haz e program because it describes uniform differences in visibility across a range of visibil ity conditions.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 18 of 142 The requirement to submit a regional haze SIP appli es to all 50 states, the District of Columbia and the Virgin Islands. 6 Congress subsequently amended the deadlines for re gional haze SIPs, and the EPA adopted regulations requirin g states to submit the first implementation plans addressing regional haze visibility impairmen t no later than December 17, 2007. 70 FR 39104. These initial SIPs were to address emissions from certain large stationary sources and other requirements, which we discuss in greater det ail later. Few states submitted a regional haze SIP by the December 17, 2007 deadline, and on Janua ry 15, 2009, the EPA found that 37 states, the District of Columbia and the Virgin Islands had failed to submit SIPs addressing the regional haze requirements. 74 FR 2392. These findings trigg ered a requirement for the EPA to promulgate FIPs within 2 years unless a state submi tted a SIP and the EPA approved that SIP within the 2-year period. CAA section 110(c). Most states eventually submitted SIPs. 7 Further, 40 CFR 51.308(f) currently requires states to submit periodic comprehensive revisions of implementation plans (referred to in t his document as periodic comprehensive SIP revisions) addressing regional haze visibility impa irment by no later than July 31, 2018, and every 10 years thereafter. These periodic comprehen sive SIP revisions must address a number of elements, including current visibility conditions a nd actual progress made toward natural conditions during the previous implementation perio d; a reassessment of the effectiveness of the long-term strategy in achieving the reasonable prog ress goals over the prior implementation period; and affirmation of or revision to the reaso nable progress goals. Further information on these periodic comprehensive SIP revisions can be f ound in section III.B.3 of this document. In

6 This requirement does not apply to other U.S. terr itories because they do not have mandatory Class I Federal areas and are too distant from any such areas to affect them. 7 All states and territories, with the exception of Hawaii, Montana and the Virgin Islands, submitted initial regional haze SIPs.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 19 of 142 addition, 40 CFR 51.308(g) requires each state to s ubmit progress reports, in the form of SIP revisions, every 5 years after the date of the stat e’s initial SIP submission. The progress reports are required to evaluate the progress made towards the reasonable progress goals for mandatory Class I areas located within the state, as well as those mandatory Class I areas located outside the state that may be affected by emissions from within the state. Further information on progress reports can be found in section III.B.4 of this doc ument. The 1999 Regional Haze Rule sought to improve effic iency and transparency by requiring states to coordinate planning under the 1 980 reasonably attributable visibility impairment provisions with planning under the provi sions added by the 1999 Regional Haze Rule. The states were directed to submit reasonably attributable visibility impairment SIPs every 10 years rather than every 3 years, and to do so as part of the newly required regional haze SIPs. Many, but not all, states submitted initial regiona l haze SIPs that committed to this coordinated planning process. Coordination of reasonably attrib utable visibility impairment and regional haze planning is described in more detail later. 2. Roles of Agencies in Addressing Regional Haze Successful implementation of the regional haze prog ram requires long-term regional coordination among states, tribal governments and v arious federal agencies. As noted earlier, pollution affecting the air quality in Class I area s can be transported over long distances, even hundreds of miles. Therefore, to effectively addres s the problem of visibility impairment in Class I areas, states need to develop strategies in coord ination with one another, taking into account the effect of emissions from one jurisdiction on the ai r quality in another. Because the pollutants that lead to regional haze c an originate from sources located across broad geographic areas, and because these so urces may be numerous and emit amounts of***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 20 of 142 pollutants that, even though small, contribute to t he collective whole, the EPA has encouraged states to address visibility impairment from a regi onal perspective. Five regional planning organizations (RPOs) were formed after the promulga tion of the Regional Haze Rule in 1999 to address regional haze and related issues. The RPOs first evaluated technical information to better understand how their states and tribes impact Class I areas across the country, and then supported the development (by states) of regional strategies to reduce emissions of pollutants that lead to regional haze. 3. Requirements for Regional Haze SIPs The Regional Haze Rule required the implementation plans due in 2007, which covered what we refer to as the first implementation period , to give specific attention to certain stationary sources that were in existence on August 7, 1977, b ut were not in operation before August 7, 1962, by requiring these sources, where appropriate , to install BART controls for the purpose of eliminating or reducing visibility impairment. BART Requirement. Section 169A of the CAA directs states to evaluate the use of retrofit controls at certain larger, often uncontrolled, old er stationary sources in order to address visibility impacts from these sources. Specifically , section 169A(b)(2)(A) of the CAA required states to revise their SIPs to include such measure s as may be necessary to make reasonable progress towards the natural visibility goal, inclu ding a requirement that certain categories of existing major stationary sources 8 procure, install, and operate BART. Under the Regi onal Haze Rule, the EPA directed states to conduct BART deter minations for any “BART-eligible”

8 The set of “major stationary sources” potentially subject-to-BART is listed in CAA section 169A(g)(7).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 21 of 142 sources 9 that may be anticipated to cause or contribute to any visibility impairment in a Class I area. The EPA published the Guidelines for BART Determinations Under the Region al Haze Rule at appendix Y to 40 CFR part 51 (hereinafter refer red to as the “BART Guidelines”) to assist states in determining which of their sources should be subject to the BART requirements and in determining appropriate emission limits for each applicable source. 70 FR 39104 (July 6, 2005). The Regional Haze Rule also gave states the flexibility to adopt an emissions trading program or other alternative program in lieu of sou rce-specific BART as long as the alternative provides greater reasonable progress towards improv ing visibility than BART and meets certain other requirements set out in 40 CFR 51.308(e)(2). States undertook the BART determination process dur ing the first implementation period. The BART requirement was a one-time requirement, bu t BART-eligible sources may need to be re-assessed for additional controls in future imple mentation periods under the CAA’s reasonable progress provisions. Specifically, we anticipate th at BART-eligible sources that installed minor controls (or no controls at all) will need to be re assessed. States should treat BART-eligible sources the same as other reasonable progress sourc es going forward. Consequently, we are not proposing any changes to the BART provisions in thi s rulemaking. Visibility Metric. The Regional Haze Rule established a standard, conv entional approach to quantifying visibility conditions and tracking h ow they change over time. The Regional Haze Rule established the 24-hour deciview haze index as the principal metric or unit for expressing visibility on any particular day. See 70 FR 39104, 39118. The deciview haze index is cal culated

9 BART-eligible sources are those sources that have the potential to emit 250 tons or more of a visibility-impairing air pollutant, were not in ope ration prior to August 7, 1962, but were in existence on August 7, 1977, and whose operations f all within one or more of 26 specifically listed source categories. 40 CFR 51.301.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 22 of 142 from light extinction values and expresses uniform changes in the degree of haze in terms of common increments across the entire range of visibi lity conditions, from pristine to extremely hazy. Deciview values are calculated by using air q uality measurements to estimate light extinction, most recently using the revised IMPROVE algorithm, and then transforming the value of light extinction using a logarithmic funct ion. 10 The deciview is a more useful measure for comparing days and tracking progress in improvi ng visibility than light extinction itself because each deciview change is an equal incrementa l change in visibility typically perceived by a human observer. Most people can detect a change i n visibility of one deciview. The preamble to the 1999 Regional Haze Rule provides additional details about the deciview haze index. We are proposing minor editorial changes to definition s related to the deciview index to ensure more consistent terminology across sections of the Regio nal Haze Rule. Baseline, Current and Natural Conditions and Tracki ng Changes in Visibility. To track changes in visibility over time at each of the 156 Class I areas covered by the visibility program (40 CFR 81.401–437), and as part of the process for determining reasonable progress, states must calculate visibility conditions at each Class I area for a 5-year period just preceding each periodic comprehensive SIP revision. 11 To do this, the Regional Haze Rule requires states to determine average visibility conditions (in decivie ws) for the 20 percent least impaired days and the 20 percent most impaired days over the 5-year p eriod at each of their Class I areas.

10 Pitchford, M.; Malm, W.; Schichtel, B.; Kumar, N.; Lowenthal, D.; Hand, J. Revised algorithm for estimating light extinction from IMPR OVE particle speciation data; J. Air & Waste Manage. Assoc. 2007, 57, 1326-1336; doi: 3155/1047- 3289.57.11.1326. 11 Under the current version of the Regional Haze Rul e, states must also periodically review progress in reducing impairment every five years.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 23 of 142 States must also develop an estimate of natural vis ibility conditions for the purpose of estimating progress toward the national goal. Natur al visibility is determined by estimating the natural concentrations of pollutants that cause vis ibility impairment and then calculating total light extinction based on those estimates. The EPA has provided guidance to states regarding how to calculate baseline, natural and current visi bility conditions. 12 After the EPA issued this guidance, a number of interested parties developed an alternative estimate of natural conditions using a more refined approach (known as “NC-II”), w hich was used by most states in their first regional haze SIPs with EPA approval. 13 Baseline visibility conditions reflect the degree of visibility impairment for the 20 percent least impaired days and 20 percent most impaired da ys for each calendar year from 2000 to 2004. Using monitoring data for 2000 through 2004, states are required to calculate the average degree of visibility impairment for each Class I ar ea, based on the average of annual values over the 5-year period. The comparison of initial baseli ne visibility conditions to natural visibility conditions indicates the amount of improvement that would be necessary to attain natural

12 Guidance for Estimating Natural Visibility Conditi ons Under the Regional Haze Rule, September 2003, EPA–454/B–03–005, available at http://www3.epa.gov/ttn/caaa/t1/memoranda/rh_envcur hr_gd.pdf ; and Guidance for Tracking Progress Under the Regional Haze Rule, September 20 03, EPA–454/B–03–004, available at http://www3.epa.gov/ttn/oarpg/t1/memoranda/rh_tpurh r_gd.pdf

. 13 Regional Haze Rule Natural Level Estimates Using t he Revised IMPROVE Aerosol Reconstructed Light Extinction Algorithm, available at http://vista.cira.colostate.edu/improve/Publication s/GrayLit/032_NaturalCondIIpaper/Copeland _etal_NaturalConditionsII_Description.pdf; Revised IMPROVE Algorithm for Estimating Light Extinction from Particle Speciation Data, available at http://vista.cira.colostate.edu/improve/Publication s/GrayLit/019_RevisedIMPROVEeq/RevisedI MPROVEAlgorithm3.doc; and Regional Haze Data Analysis Workshop, June 8, 2005, Denver, CO, agenda and documents available at http://www.wrapair.org/forums/aamrf/meetings/050608 den/index.html.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 24 of 142 visibility. Over time, the comparison of current co nditions 14 to the baseline conditions will indicate the amount of progress that has been made. The rule text adopted in 1999 defined “visibility i mpairment” as a humanly perceptible change (i.e., difference) in visibility from that w hich would have existed under natural conditions. The rule text directed the tracking of visibility impairment on the 20 percent “most impaired days” and 20 percent “least impaired days” in order to determine progress towards natural visibility conditions. Section 51.308(d)(2) (i-iv). In light of the 1999 rule’s definition of “impairment,” the term “impaired” in the phrases “m ost impaired days” and “least impaired days” could be taken to connote anthropogenic impai rment. However, the preamble to the 1999 final rule stated that the least and most impaired days were to be selected as the monitored days with the lowest and highest actual deciview levels, respectively. In 2003, the EPA issued guidance describing in detail the steps necessary f or selecting and calculating light extinction on the “worst” and “best” visibility days, and this gu idance also indicated that the monitored days with the lowest and highest actual deciview levels were to be selected as the least and most impaired days. 15 This approach has worked well in many Class I area s but has not in other areas. Specifically, the “worst” visibility days in some C lass I areas can be impacted by natural emissions (e.g., wildland wildfires and dust storms ). These natural contributions to haze vary in magnitude and timing. Anticipating this variability , in the 1999 Regional Haze Rule the EPA had decided to use 5-year averages of visibility data t o minimize the impacts of the interannual

14 Given the required timing of the first regional ha ze SIPs that were due by December 17, 2007, “baseline visibility conditions” were also the “cur rent” visibility conditions. For future SIPs, “current conditions” will be updated to the 5-year period just preceding the SIP revision. 15 Guidance for Tracking Progress Under the Regional Haze Rule, September 2003, http://www3.epa.gov/ttnamti1/files/ambient/visible/ tracking.pdf.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 25 of 142 variability in natural events. However, as the IMPR OVE monitoring network has collected more years of data, it has become obvious that in many C lass I areas 5-year averages are not sufficient for minimizing these impacts. As a result, visibili ty improvements resulting from decreases in anthropogenic emissions can be hidden in this uncon trollable natural variability. In addition, because of the logarithmic deciview scale, changes in PM concentrations and light extinction due to reductions in anthropogenic emissions have littl e effect on the deciview value on days with high PM concentrations and light extinction due to natural sources. The use of the days with the highest deciview index values, without consideratio n of the source of the visibility impacts, thus has created difficulties when attempting to track v isibility improvements resulting from controls on anthropogenic sources. States have identified th is difficulty and asked that the EPA explore options for focusing the visibility tracking metric on controllable anthropogenic emissions. To help states minimize the impacts of uncontrollable emissions on visibility tracking, the EPA is proposing to more explicitly (and consistently) add ress this issue for future implementation periods in the “Proposed Rule Changes” section of t his document (sections IV.C. and IV.D). Reasonable Progress Goals and Long-Term Strategy. To ensure continuing progress towards achieving the natural visibility goal, each SIP in the series of periodic comprehensive regional haze SIPs must establish two distinct reas onable progress goals (one for the most impaired and one for the least impaired days) for e very Class I area for the following implementation period. See 40 CFR 51.308(d) and (f). The Regional Haze Rule d oes not mandate specific milestones or rates of progress, b ut instead calls for states to establish goals that provide for “reasonable progress” toward achieving natural visibility conditions. In setting reasonable progress goals, states must provide for an improvement in visibility for the most impaired days over the period of the SIP, and ensur e no degradation in visibility for the least***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 26 of 142 impaired days over the same period. Id . Consistent with the requirement in section 169A(b ) of the CAA that states include in their regional haze SIPs a 10- to 15-year strategy for making reasonable progress, §51.308(d)(3) of the Regional Haze Rule requires that states include their long-term strategy in their regional haze SIPs. The reasonable progress goals themselves, however, are not enforceable. 64 FR 35754. In establishing reasonable progress goals, states a re required to consider the following factors set out in the definition of “reasonable pr ogress” in section 169A of the CAA and incorporated into the Regional Haze Rule at 40 CFR 51.308(d)(1)(i)(A): (1) the costs of compliance; (2) the time necessary for compliance; (3) the energy and non-air quality environmental impacts of compliance; and (4) the re maining useful life of any potentially affected sources. States must demonstrate in their SIPs how these factors have been considered when selecting the reasonable progress goals for th e least impaired and most impaired days for each applicable Class I area. It is important to un derstand that a state’s long-term strategy is inextricably linked to the reasonable progress goal s because the long-term strategy “must include enforceable emission limitations, compliance schedu les, and other measures as necessary to achieve the reasonable progress goals established b y states having mandatory Class I Federal areas.” 40 CFR 51.308(d)(3). As intended by the EPA and as understood by all states in the first implementation period, the four reasonable progress factors are considered by a state in setting the reasonable progress goal by virtue of the state having first considered them, and certain other factors listed in §51.308(d)(3) of the Regional Haz e Rule, when deciding what controls are to be included in the long-term strategy. Then, the numer ical levels of the reasonable progress goals are the predicted visibility outcome of implementin g the long-term strategy in addition to ongoing pollution control programs stemming from ot her CAA requirements. To ensure***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 27 of 142 consistent understanding about the relationship bet ween reasonable progress goals and the longterm strategy, we are proposing rule text changes t o clarify this relationship in the “Proposed Rule Changes” section of this document (section IV. A). The proposed rule text is consistent with our long-held interpretation of the existing rule t ext as stated earlier. 16 In deciding on the long-term strategy and in settin g the reasonable progress goals, states must also consider the rate of progress for the mos t impaired days that would be needed to reach natural visibility conditions by 2064 [referred to as the “uniform rate of progress” (URP)] and the emission reduction measures that would be neede d to achieve that rate of progress over the approximately 10-year period of the SIP. Uniform pr ogress towards achievement of natural conditions by the year 2064 represents a rate of pr ogress that states are to use for analytical comparison to the amount of progress they expect to achieve on average. The CAA has the goal of reaching natural conditions, 17 but does not have any date for achievement of that goal, requiring only that plans demonstrate reasonable pr ogress towards it. The Regional Haze Rule reiterates the CAA goal, and provides for the use o f an analytical framework that compares the rate of progress that will be achieved by a SIP (as represented by the reasonable progress goals for the end of the implementation period) to the ra te of progress that if continued would result in natural conditions in 2064 (i.e., the URP). When a SIP contains a reasonable progress goal for

16 The EPA’s interpretation of the proper relationshi p between a state’s reasonable progress goals and its long-term strategy is explained in detail i n our proposed action on SIPs from Texas and Oklahoma. See section IV.C at 79 FR 74828. This interpretation w as reaffirmed in our final action on these SIPs. See section II.C of 81 FR 296 (January 5, 2016). 17 The text of the Regional Haze Rule states the goal of achieving “natural visibility conditions.” While section 169A(a)(1) of the CAA calls for “the prevention of any future, and the remedying of any existing, impairment of visibility in mandat ory class I Federal areas which impairment results from manmade air pollution,” litigation ove r the Regional Haze Rule has indicated the visibility goal stated in the CAA means achievement of “natural visibility conditions.”***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 28 of 142 the most impaired days that reflects progress that is equal to the URP, the reasonable progress goal is said to be “on the URP line” or “on the gli depath.” If a state’s reasonable progress goal for the most impaired days is not on the glidepath, §51.308(d)(1)(ii) requires the state to demonstrate that it would not be reasonable to adop t a reasonable progress goal (and by implication a long-term strategy) that would be on the glidepath. The Regional Haze Rule does not establish an enforceable requirement that natur al conditions be reached in 2064. The EPA has approved a number of SIPs for the first impleme ntation period that have projected that continued progress at the rate expected to be achie ved during that first period would not result in natural conditions until a date after 2064. In setting reasonable progress goals, each state wi th one or more Class I areas must also consult with potentially “contributing states,” i.e ., other nearby states with emission sources that may be affecting visibility impairment in the state ’s Class I areas. In such cases, the contributing state must demonstrate that it has included in its SIP all measures necessary to obtain its share of the emission reductions needed to meet the reasonab le progress goals for the Class I area. Furthermore, section 169A(g)(1) of the CAA and §51. 308(d)(1)(i)(A) of the Regional Haze Rule require that states determine “reasonable progress” by considering the four statutory factors. Also, §51.308(d)(3) requires each state to consider its own Class I areas (if it has any) and downwind Class I areas (which may be affected by em issions from the state) when it develops its long-term strategy. In determining whether a state’ s long-term strategy and reasonable progress goals provide for reasonable progress toward natura l visibility conditions, the EPA is required to evaluate the demonstrations developed by the state. 40 CFR 51.308(d)(1). To ensure consistent understanding about the long-term strategy obligati ons of all states, we are proposing rule text changes to clarify these obligations in the “Propos ed Rule Changes” section of this document***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 29 of 142 (section IV.B). The proposed rule text is consisten t with our long-held interpretation of the existing rule text as stated earlier. In accordance with the Regional Haze Rule, states s hould consider all types of anthropogenic sources of visibility impairment in d eveloping their long-term strategy, including major and minor stationary sources, mobile sources and area sources. At a minimum, states must describe how each of the following seven factors ar e taken into account in developing their longterm strategy: (1) Emission reductions due to ongoi ng air pollution control programs, including measures to address reasonably attributable visibil ity impairment; (2) measures to mitigate the impacts of construction activities; (3) emissions l imitations and schedules for compliance to achieve the reasonable progress goal; (4) source re tirement and replacement schedules; (5) smoke management techniques for agricultural and fo restry management purposes including plans as currently exist within the state for these purposes; (6) enforceability of emissions limitations and control measures; and (7) the antic ipated net effect on visibility due to projected changes in point, area and mobile source emissions over the period addressed by the long-term strategy. 40 CFR 51.308(d)(3)(v). We are proposing to update the terminology in the fifth of these factors. We are not proposing any changes to the current requirements regarding the other six factors. As discussed earlier, the current version of the Re gional Haze Rule requires control strategies to cover an initial implementation perio d extending to the year 2018, with a comprehensive reassessment and revision of those st rategies, as appropriate, every 10 years thereafter. The reasonable progress goals are speci fic to the end date of a given implementation period. New reasonable progress goals for the end o f the next period are established in the next periodic comprehensive SIP revision. We are proposi ng to extend, to July 31, 2021, the due date***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 30 of 142 for the SIP revision that under the existing Region al Haze Rule is due July 31, 2018. This proposed change is discussed in the “Proposed Rule Changes” section of this document (section IV.J). Coordinating Regional Haze and Reasonably Attributa ble Visibility Impairment. The 1999 Regional Haze Rule fulfilled the EPA’s respons ibility to put in place a national regulatory program that addresses both reasonably attributable and regional haze visibility impairment. As part of the Regional Haze Rule, the EPA revised 40 CFR 51.306(c) regarding reasonably attributable visibility impairment assessment and p lanning to require that the reasonably attributable visibility impairment plan must contin ue to provide for a periodic review and SIP revision not less frequently than every 3 years unt il the date of submission of the state’s first plan addressing regional haze visibility impairment, whi ch was due December 17, 2007. On or before this date, the state must have revised its plan to provide for periodic review and revision of a coordinated long-term strategy for addressing reaso nably attributable visibility impairment and regional haze, and the state must have submitted th e first such coordinated long-term strategy with its first regional haze SIP. Under the current version of the regulations, future coordinated long-term strategies, and periodic progress reports evaluating progress towards reasonable progress goals, must be submitted consistent with t he schedule for SIP submission and periodic progress reports set forth in 40 CFR 51.308(f) and 51.308(g), respectively. The periodic review of a state’s long-term strategy must report on both regional haze visibility impairment and reasonably attributable visibility impairment and m ust be submitted to the EPA in the form of a periodic comprehensive SIP revision. Under our prop osed changes to the reasonably attributable visibility impairment provisions, described in deta il in section IV.G, this coordinated approach to a state’s long-term strategies for regional haze an d reasonably attributable visibility impairment***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 31 of 142 would continue, but would apply only when the state is under an obligation to respond to a reasonably attributable visibility impairment certi fication. Monitoring Strategy and Other Implementation Plan R equirements. Section 51.308(d)(4) of the Regional Haze Rule includes the requirement for a monitoring strategy for measuring, characterizing and reporting of regional haze visib ility impairment that is representative of all mandatory Class I areas within the state. The strat egy must be coordinated with the monitoring strategy required in the current version of §51.305 for reasonably attributable visibility impairment. Compliance with this requirement may be met through “participation” in the IMPROVE network. 18 A state’s participation in the IMPROVE network inc ludes state support for the use of CAA state and tribal assistance gran ts funds to partially support the operation of the IMPROVE network as well as its review and use o f monitoring data from the network. The monitoring strategy was due with the first regional haze SIP, and under the current Regional Haze Rule it must be reviewed every 5 years as part of the progress reports. The monitoring strategy must also provide for additional monitorin g sites if the IMPROVE network is not sufficient to determine whether reasonable progress goals will be met. To date, neither the EPA nor any state has concluded that the IMPROVE networ k is not sufficient in this way. The evolution of the IMPROVE network will be guided by a Steering Committee that has FLM, EPA and state participation, within the evolving contex t of available resources. It is the EPA’s objective that individual states will not be requir ed to commit to providing monitoring sites beyond those planned to be operated by the IMPROVE program during the period covered by a

18 While compliance with §51.308(d)(4) for regional h aze may be met through participation in the IMPROVE network, additional analysis or techniq ues beyond participation in IMPROVE may be required for compliance with §51.305 for rea sonably attributable visibility impairment.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 32 of 142 SIP revision. The EPA also believes that if the IMP ROVE program must discontinue a monitoring site, this would not be a basis for an a pproved regional haze SIP to be found inadequate, but rather the state, the federal agenc ies and the IMPROVE Steering Committee should work together to address the Regional Haze R ule requirements when the next SIP revision is developed. As described in section IV.F , we are proposing that progress reports from individual states no longer be required to review a nd modify as necessary the state’s monitoring strategy. We believe the IMPROVE Steering Committee structure, the requirement to review the monitoring strategy as part of the periodic compreh ensive SIP revision, and the requirement for a state to consider any recommendations from the EPA or a FLM for additional monitoring for purposes of reasonably attributable visibility impa irment will be sufficient to achieve the objective of the current progress report requiremen t to review the monitoring strategy. Consultation between States and FLMs. The existing Regional Haze Rule requires that states consult with FLMs before adopting and submit ting their SIPs. 40 CFR 51.308(i). States must provide FLMs an opportunity for consultation, in person and at least 60 days prior to holding any public hearing on the SIP. This consult ation must include the opportunity for the FLMs to discuss their assessment of impairment of v isibility in any Class I area and to offer recommendations on the development of the reasonabl e progress goals and on the development and implementation of strategies to address visibil ity impairment. Further, a state must include in its SIP a description of how it addressed any comme nts provided by the FLMs. Finally, a SIP must provide procedures for continuing consultation between the state and FLMs regarding the state’s visibility protection program, including de velopment and review of SIP revisions, progress reports, and the implementation of other p rograms having the potential to contribute to***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 33 of 142 impairment of visibility in Class I areas. We are p roposing to require that states also consult with FLMs earlier in the development of their SIPs, as d escribed in section IV.I. 4. Requirements for the Regional Haze Progress Repo rts The current version of the Regional Haze Rule inclu des provisions for progress reports to be submitted at 5-year intervals, counting from the submission of the first required SIP revision by the particular state. The requirements for these reports are included for most states in 40 CFR 51.308 (g) and (h). Three western states (New Mexic o, Utah and Wyoming) exercised an option provided in the Regional Haze Rule to meet alternat ive requirements contained in 40 CFR 51.309 for their SIPs. For these three states, the requirements for the content of the 5-year progress reports are identical to those for the oth er states, but for these states the requirements fo r the reports are codified in 40 CFR 51.309(d)(10). T his section specifies fixed due dates in 2013 and 2018 for these progress reports. Regardless, th e current Regional Haze Rule provides that these three states will revert to the progress repo rt requirements in 40 CFR 51.308 after the report currently due in 2018. An explanation of the 5-year progress reports is pr ovided in the preamble to the 1999 Regional Haze Rule. 64 FR 35747 (July 1, 1999). Thi s 5-year review is intended to provide an interim report on the implementation of, and, if ne cessary, mid-course corrections to, the regional haze SIP, which, as noted earlier, is prep ared in 10-year increments. The progress report provides an opportunity for public input on the sta te’s (and the EPA’s) assessment of whether the approved regional haze SIP is being implemented app ropriately and whether reasonable visibility progress is being achieved consistent with the proj ected visibility improvement in the SIP. Required elements of the progress report include: t he status of implementation of all measures included in the regional haze SIP; a summa ry of the emissions reductions achieved***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 34 of 142 throughout the state; an assessment of current visi bility conditions and the change in visibility impairment over the past 5 years; an analysis track ing the change over the past 5 years in emissions of pollutants contributing to visibility impairment from all sources and activities within the state; an assessment of any significant changes in anthropogenic emissions within or outside the state that have occurred over the past 5 years that have limited or impeded progress in reducing pollutant emissions and improving visibili ty; an assessment of whether the current SIP elements and strategies are sufficient to enable th e state (or other states with mandatory Class I areas affected by emissions from the state) to meet all established reasonable progress goals; a review of the state's visibility monitoring strateg y and any modifications to the strategy as necessary; and a determination of the adequacy of t he existing SIP (including taking one of four possible actions). 19 We are proposing a number of clarifications and ch anges to the requirements for the content of progress reports, as described i n section IV.F. In accordance with 40 CFR 51.308(g) and 51.309(d)(1 0), progress reports must currently take the form of SIP revisions, so states must foll ow formal administrative procedures (including public review and opportunity for a public hearing) before formally submitting the 5-year progress report to the EPA. See 40 CFR 51.102, 40 CFR 51.103, and Appendix V to Pa rt 51 – Criteria for Determining the Completeness of Plan S ubmissions. We are proposing to remove the requirement that progress reports be submitted as S IP revisions, as described in section IV.L.

19 40 CFR 51.308(g). See also General Principles for the 5-Year Regional Ha ze Progress Reports for the Initial Regional Haze State Implementation Plans (Intended to Assist States and EPA Regional Offices in Development and Review of the P rogress Reports), April 2013, EPA– 454/B–03–005, available at http://www.4cleanair.org/Documents/haze_5year_4-10- 13.pdf , (hereinafter referred to as “our 2013 Progress Repo rt Guidance”).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 35 of 142 In addition, as with SIPs, states are required to p rovide FLMs with an opportunity for inperson consultation at least 60 days prior to any p ublic hearing on an implementation plan or plan revision, which must include an opportunity fo r FLMs to discuss their assessment of impairment of visibility in any mandatory Class I a rea, and discuss their recommendations on the development of reasonable progress goals and the de velopment of implementation strategies to address visibility impairment. See 40 CFR 51.308(i)(2) and (3). Procedures must also be provided for continuing consultation between the st ate and FLM regarding development and review of progress reports. See 40 CFR 51.308(i)(4). We are proposing to preserve the existing requirement for consultation with FLMs on progress reports. The first progress reports are currently due 5 year s from the initial SIP submittal (with the next progress reports for New Mexico, Utah, and Wyo ming due in 2018). Most of these deadlines have already passed although some are due in 2016 and in 2017. We are proposing a set of common due dates for future progress reports from all states, as described in section IV.K. 5. Tribes and Regional Haze Tribes have a distinct interest in regional haze du e to the effects of visibility impairment on tribal lands as well as on other lands of high v alue to tribal members, such as landmarks considered sacred. Tribes, therefore, have a strong interest in emission control measures that states and the EPA incorporate into SIPs and FIPs w ith regard to regional haze, and also have an interest in the state response to any reasonably at tributable visibility impairment certification made by an FLM.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 36 of 142 The EPA takes seriously our government-to-governmen t relationship with tribes. 20 The agency has a tribal consultation policy that covers any plan that the EPA would promulgate that may affect tribal interests. This consultation poli cy applies to situations where a potentially affected source is located on tribal land, as well as situations where a SIP or FIP concerns a source that is located on state land and may affect tribal land or other lands that involve tribal interests. In addition, the EPA has and will contin ue to consider any tribal comments on any proposed action on a SIP or FIP. In the first implementation period for regional haz e SIPs, the partnerships within the RPOs included strong relationships between the stat es and the tribes, and the EPA encourages states to continue to invest in those relationships (including consulting with tribes), particularly with respect to tribes located near Class I areas. States should continue working directly with tribes on their SIPs and their response to any reas onably attributable visibility impairment certification made by an FLM. The EPA believes that it is preferable for states to address tribal concerns during their planning process rather than the EPA addressing such concerns in its subsequent rulemaking process. During the developme nt of this rulemaking, the EPA was asked by the National Tribal Air Association to adopt a r equirement that states formally consult with tribes during the development of their regional haz e SIPs. While we recognize the value of dialog between state and tribal representatives, we are not proposing to require it. We note that the CAA does not explicitly authorize the EPA to im pose such a requirement on the states.

20 Like the EPA, the Department of the Interior and t he U.S. Forest Service in the U.S. Department of Agriculture have strong tribal consul tation policies. See : http://www.epa.gov/tribal/consultation/index.htm ; http://www.fs.fed.us/spf/tribalrelations/authoritie s.shtml , and https://www.doi.gov/tribes/Tribal-Consultation-Poli cy.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 37 of 142 C. Air Permitting One part of the visibility protection program, 40 C FR §51.307, New Source Review , was created in 1980 with the rationale that while most new sources that may impair visibility were already subject to review under the Prevention of S ignificant Deterioration (PSD) provisions (Part C of Title I of the CAA), additional regulati ons would “ensure that certain sources exempt from the PSD regulations because of geographic crit eria will be adequately reviewed for their potential impact on visibility in the mandatory Cla ss I Federal area.” 45 FR 80084 (December 2, 1980). The EPA explained at proposal that this was necessary because the PSD regulations did not call for the review of major emitting facilitie s (or major modifications) located in nonattainment areas, 21 and that it was appropriate to “clarify certain pr ocedural relationships between the FLM and the state in the review of new source impacts on visibility in Federal class I areas.” 45 FR 34765 (May 22, 1980). The EPA envis ioned that state and FLM consultation would commence with the state notifying the FLM of a potential new source, and that consultation would continue throughout the permitti ng process. We are proposing to revise §51.307 only as needed to maintain consistency with revisions to other sections of 40 CFR part 50 subpart P.

21 In 1978, PSD rules were put in place that required permitting agencies to interact with FLMs and for air quality related values (AQRVs) to be ta ken into consideration in the PSD permitting process. 43 FR 26380 (June 19, 1978). Those PSD rul es did not cover sources in nonattainment areas, and while there were EPA rules for nonattain ment new source review in existence, they did not require consideration of Class I areas. In 1979, 40 CFR part 51, appendix S established rules for nonattainment permitting, but they did no t (and still do not) require consideration of visibility or FLM notification. (The same is also t rue of a more recent addition, 40 CFR 51.165. Where applicable to nonattainment areas, this rule does not require Class I reviews. While 40 CFR 51.165(b) requires that sources located in atta inment areas cannot cause or contribute to a NAAQS violation anywhere, this does not cover AQRVs in Class I areas.) As a result, in 1980, the EPA added requirements to 40 CFR 51.307 for not ification of FLMs of pending permits for new sources in nonattainment areas.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 38 of 142 IV. Proposed Rule Changes The changes being proposed by the EPA will continu e steady environmental progress in the regional haze program while streamlining its ad ministrative aspects that do not add to environmental protection. The EPA has gained a subs tantial amount of knowledge through the process of approving SIPs for the first regional ha ze implementation period and has learned what aspects of the program work well and what aspects s hould be modified going forward. Feedback received from co-regulators during this process has been invaluable in developing this proposal, which seeks to reduce administrative burdens of the regional haze program without sacrificing environmental protection. Indeed, the EPA believes that reducing administrative burdens will result in a more effective program in terms of achi eving the goal of improved visibility. A. Clarifications to Reflect the EPA’s Long-Standin g Interpretation of the Relationship Between Long-Term Strategies and Reasonable Progress Goals. The EPA is proposing to amend §51.308(f) of the Reg ional Haze Rule, which contains the requirements for comprehensive periodic revisio ns to regional haze SIPs, by adding new provisions that will govern the development of long -term strategies and reasonable progress goals in future implementation periods. We are prop osing these changes in light of recent attempts by commenters and litigants to mischaracte rize the existing long-sterm strategy and reasonable progress goal requirements in a way that is detrimental to the visibility program. For example, litigants challenging the EPA’s FIP for Ar izona and FIPs for Texas and Oklahoma have attempted to place primacy on States’ unenforc eable reasonable progress goals rather than the emission limitations which form the basis of th ose goals. The EPA’s proposed revisions to***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 39 of 142 §51.308(f) are consistent with the EPA’s long-stand ing interpretation 22 of the existing regulations at §51.308(d), but are organized in a m ore logical fashion. While the new provisions track the language of the existing regulations at § 51.308(d) in many respects, the EPA also has proposed changes in certain places to eliminate amb iguities created by the existing language and to conform with substantive changes being proposed elsewhere in this rulemaking. In this section, we discuss only those changes that are int ended to provide clarity regarding the relationship between long-term strategies and reaso nable progress goals. Unlike some of the provisions discussed in subsequent sections of this preamble, the changes discussed in this section do not create new requirements for states. Section 51.308(d) of the existing Regional Haze Rul e is organized into four subsections: (d)(1), concerning the calculation of reasonable pr ogress goals; (d)(2), concerning the calculation of baseline and natural visibility conditions; (d)( 3), concerning the development of long-term strategies; and (d)(4), concerning the development of monitoring strategies. This organizational structure does not reflect the actual sequence of s teps in the regional haze planning process. For example, §51.308(d) lists the requirements for reas onable progress goals before the requirements for long-term strategies. In practice, states must evaluate the four statutory factors to select emission control measures for their long-term strat egies before they can calculate their reasonable progress goals by modeling the visibilit y improvement that will result from the implementation of those controls.

22 The EPA’s interpretation of the proper relationshi p between a state’s reasonable progress goals and its long-term strategy in explained in detail i n our proposed action on SIPs from Texas and Oklahoma. See section IV.C at 79 FR 74828. This interpretation w as reaffirmed in our final action on these SIPs. See section II.C at 81 FR 308 (January 5, 2016).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 40 of 142 To address this issue and provide clarity to states and other stakeholders, the EPA is proposing to organize the requirements in §51.308(f ) in a more logical fashion. First, proposed subsection (f)(1) provides the requirements governi ng the calculation of baseline and natural visibility conditions, which are necessary to calcu late the URP. A state should calculate current visibility conditions, the URP and the URP line fir st. In doing so, the contributions of PM species to current anthropogenic light extinction ( referred to as the anthropogenic light extinction budget) will become evident, which will inform the state’s thinking as to which sources or source categories should be evaluated for potential reason able progress control measures. Second, proposed subsection (f)(2) provides the requirement s governing the development of long-term strategies. In this step, states must, among other things, evaluate sources that impact visibility at one or more Class I areas for potential control mea sures by considering the four statutory factors. Third, proposed subsection (f)(3) provides the requ irements governing the calculation of reasonable progress goals. Once a state has establi shed emission limitations and other control measures as part of its long-term strategy, the sta te will have the information necessary to model the visibility improvement that will result at each Class I area on the 20 percent most impaired days and 20 percent clearest days after the long-te rm strategy has been implemented. The projected visibility conditions at the end of the a pplicable implementation period constitute the reasonable progress goals. States must then compare the goals for the Class I area to the URP. If the goal for the 20 percent most impaired days is a bove the URP line, the state must demonstrate that there are no additional control measures for s ources reasonably anticipated to contribute to visibility impairment in the Class I area that are reasonable to include in the long-term strategy. Finally, proposed subsection (f)(4) provides the re quirements governing monitoring strategies,***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 41 of 142 which must be sufficient to allow states to assess the adequacy of their long-term strategies going forward. In addition to these organizational changes, the EP A is proposing new language in §51.308(f)(2) that differs from the existing langua ge in §51.308(d)(3), but is intended to achieve the same result. First, the EPA is proposing langua ge in §51.308(f)(2)(i) and (iv) to clarify that all states, not just those with Class I areas, must consider the four statutory factors and properly document all cost, visibility and other technical a nalyses when developing their long-term strategies. Second, the EPA is proposing language i n §51.308(f)(2)(ii) that requires states to consider the URP and the measures that contributing states are including in their long-term strategies when determining whether the state’s own long-term strategy is sufficient to ensure reasonable progress. 23 States must provide a robust demonstration, includ ing documenting the criteria used to determine which sources or groups or sources were evaluated, of how the four factors were taken into consideration in selecting the measures for inclusion in its long-term strategy. Finally, the EPA is proposing language in §51.308(f)(2)(iii) to clarify the respective obligations of “contributing states” and “states af fected by contributing states,” during interstate consultation. As is the case under the existing rul e text, the EPA will evaluate the sufficiency of the record developed by each state, the state’s con clusions, and any disagreements among states to determine whether the state has used reasoned de cisionmaking in choosing a set of a control measures that will achieve reasonable progress at t he Class I areas impacted by the state’s sources. States must document all substantive inter state consultations.

23 The EPA views this as a clarification of the requi rement that states with sources affecting a given Class I area consult on the content of their long-term strategies. Such consultation would be pointless if each state were not meant to consid er the other states’ planned emission control measures.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 42 of 142 B. Other Clarifications and Changes to Requirements for Periodic Comprehensive Revisions of Implementation Plans The following clarifications and changes are also p roposed to be included in the revised §51.308(f). The URP line starts at 2000-2004, for every impleme ntation period. The current text of §51.308(d)(1)(i)(B) contains a discussion of how st ates must analyze and determine “the rate of progress needed to attain natural visibility condit ions by the year 2064.” While not actually used within the current rule text, the term that has bee n commonly used to describe this rate is the “uniform rate of progress” or URP. The current text of §51.308(f) indicates that states must evaluate and reassess all elements required by §51. 308(d), and hence the URP, in the second and subsequent implementation periods. Section 51.308(d ) is not perfectly clear about whether “the rate of progress needed to attain natural visibilit y conditions by the year 2064” is meant to refer to needed progress measured from visibility conditi ons in the baseline period of 2000-2004, or further needed progress measured from “current” vis ibility conditions (i.e., the visibility conditions during a 5-year period ending shortly be fore SIP submission). In other words, the section is not perfectly clear as to whether the gl idepath or URP line that applies to the SIP for the second or a later implementation period always starts in the baseline period of 2000-2004, or in the most recent 5-year period. It is clear that the glidepath or URP line then reaches natural visibility conditions in “2064,” but no exact date in 2064 is specified. To ensure consistent understanding, the EPA is prop osing rule revisions to state explicitly that in every implementation period, the glidepath or URP line for each Class I area is drawn starting on December 31, 2004, at the value of the 2000-2004 baseline visibility conditions for the 20 percent most impaired days, and ending at th e value of natural visibility conditions on***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 43 of 142 December 31, 2064. In this way, it is clear that fo r a Class I area that has achieved more than the URP in the first implementation period, the state c an take that into account in its URP analysis for the second implementation period. Specifying th at the 5-year average baseline visibility conditions are associated with the date of December 31, 2004 and that natural visibility conditions are associated with the date of December 31, 2064 also clarifies that the period of time between the baseline period and natural visibi lity conditions, which is needed for determining the URP (deciviews/year) is 60 years. Note that because of updates to the IMPROVE program , some data values from 2000- 2004 may be revised over time. 24 Therefore, the value of the starting point for the URP (i.e., baseline visibility conditions) should be re-calcul ated for purposes of accuracy of analysis in any given periodic comprehensive SIP revision. In addit ion, the value of the baseline visibility conditions must be recalculated to be consistent wi th the approach used for the selection of the most impaired days in the SIP revision under prepar ation ( see section IV.C of this document). Along with the clarification that the baseline peri od remains 2000-2004 for subsequent implementation periods, the EPA also proposes to in clude clarifications on how states treat Class I areas without available monitoring data or Class I areas with incomplete monitoring data. If Class I areas do not have monitoring data for the b aseline period, data from representative sites should be used. If baseline monitoring data are inc omplete, states should use the 5 complete years closest to the baseline period (i.e., if a mo nitor began operating in mid-2000, then 2001- 2005 would be used as the baseline period for the C lass I area). The proposed rule text on this

24 IMPROVE data from the 2000-200 45 period may be revised after initially reported bec ause of more recently revised methods for calculating ambie nt concentrations from measurements made on filters and because of revised methods for filli ng in missing or invalidated data. Such revisions are made in order to maintain consistency in reported results across the years.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 44 of 142 issue, appearing in §51.308(f)(1)(i), does not appe ar in the current §51.308(d) because at the time §51.308(d) was proposed and finalized, it was not a nticipated that this data incompleteness situation would exist. We are proposing to add this provision to remove any uncertainty about how an issue of data incompleteness should be addre ssed in a SIP. As part of this clarification and to maintain consi stency in the reasonable progress goal framework, the proposed language in §51.308(f)(3)(i ) (and an accompanying definition of “end of the applicable implementation period” added to § 51.301) would make clear that reasonable progress goals are to address the period extending to the end of the year of the due date of the next periodic comprehensive SIP revision. Also, pro posed §51.308(f)(1)(iv) specifies the end day of 2064 as the ending point of the glidepath or URP line. Visibility conditions on the clearest 20 percent of days must show no deterioration from conditions in 2000-2004. The current text of §51.308(d)(1) states that the r easonable progress goals must provide for an improvement in visibility for the most impaired days over the period of the implementation plan and ensure no degradation i n visibility for the least impaired days over the same period. This text is not clear as to wheth er “the period of the implementation plan” refers to the entire period since the baseline peri od of 2000-2004, or to the specific implementation period addressed by the periodic SIP revision. However, a summary table in the preamble to the 1999 Regional Haze Rule indicated t hat the 2000-2004 period would be used for “tracking visibility improvement .” 25 To avoid any confusion going forward, we are propo sing new rule text in revised §51.308(f)(3)(i) to make i t clear that the baseline for determining whether there is deterioration on the 20 percent cl earest days is the baseline period of 2000-2004.

25 64 FR 35730 (July 1, 1999).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 45 of 142 Analytical Obligation When the Reasonable Progress Goal for the 20 Percent Most Impaired Days Is Not On or Below the URP Line. The EPA is proposing to clarify how the comparison of the reasonable progress goal for the 20 percent most impaired days to the rate of visibility improvement needed to attain natural con ditions by 2064 (i.e., the glidepath or URP line) determines the content of the demonstration t he state must submit to show that its long-term strategy provides for reasonable progress. This cla rification appears in the proposed §51.308(f)(3)(ii). The current text of §51.308(d)(1)(ii) discusses req uired actions of the state containing the Class I area should it set a reasonable progress go al that provides for a slower rate of visibility improvement than that needed to attain natural cond itions by 2064 (i.e., a reasonable progress goal for the 20 percent most impaired days that is above the URP line). This section provides that in this situation, the state must demonstrate, base d on the four reasonable progress factors, that the rate of progress for the implementation plan to attain natural conditions by 2064 is not reasonable, and that the progress goal adopted by t he state is reasonable. To clarify how a state must show that being on the URP line is not reasona ble in its SIP for the second and subsequent regional haze implementation periods, the EPA is pr oposing that if the reasonable progress goal is above the URP line, the state must demonstrate, based on the four reasonable progress factors, that there are no additional emission reduction mea sures for any source or group of sources that are reasonably anticipated to contribute to visibil ity impairment that would be reasonable to include in the long-term strategy. In existing sections 51.308(d)(2)(iv) and 51.308(d) (3)(i) and (ii), sentences addressing obligations of the state with the Class I area and obligations of the contributing state(s) are juxtaposed in such a way that it can be confusing f or a reader to understand which of the two***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 46 of 142 states is being referred each time the word “state” appears. The proposed §51.308(f)(2)(iii) more clearly spells out the respective consultation resp onsibilities of states containing Class I areas as well as states with sources that may reasonably be anticipated to cause or contribute to visibility impairment in those areas. To clarify and solidify the obligations of what we are referring to as contributing states, §51.308(f)(3)(ii)(B) is proposed to specify that in situations where reasonable progress goals are set above the glidepath, a contributing state must make the same demonstration with respect to its own long-term strategy that is required of the state containing the Class I area, namely that there are no other measures needed to provide for r easonable progress. This provision will ensure that states perform rigorous analyses, and adopt me asures necessary for reasonable progress, with respect to Class I areas that their sources co ntribute to, regardless of whether such areas are physically located within their borders.
Emission inventories . The proposed language of §51.308(f)(2)(iv) regard ing the baseline emissions inventory to use in developing the techni cal basis for the state’s long-term strategy would reconcile this section with changes that have occurred to 40 CFR part 51, subpart A, Air Emissions Reporting Requirements, since the Regiona l Haze Rule was originally promulgated in 1999. The proposed changes also would provide flexi bility in the base inventory year the state chooses to use, as the EPA has always intended if t here is good reason to use another inventory
year. EPA action on reasonable progress goals . Proposed language in §51.308(f)(3)(iv) would make clear that in approving a state’s reasonable p rogress goals, the EPA will consider the controls and technical demonstration provided by a contributing state with respect to its longterm strategy, in addition to those developed by th e state containing the Class I area with respect***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 47 of 142 to its long-term strategy. This section is a clarif ication of §51.308(d)(1)(iii), which only explicitly mentions the demonstration provided by t he state containing the Class I area. Progress reports . Finally, proposed language in §51.308(f)(5) compl ements proposed changes regarding progress reports and the proposal to eliminate separate progress reports being due simultaneously with periodic comprehensive SIP revisions. This language would require the periodic comprehensive SIP revision to include cert ain items of information that would have been addressed in the progress report, thereby expa nding its scope somewhat. While the state would no longer need to prepare and submit two sepa rate documents at the same time (the periodic comprehensive SIP revision and a progress report), the same information would still be covered. Combining requirements in this way will av oid the overlap in content that would occur with two separate documents. Smoke management programs and basic smoke managemen t practices . The proposed §51.308(f)(2)(vi)(E) mirrors the existing §51.308(d )(3)(v)(E) with updates to reflect terminology used within the air quality and land management com munities to clarify and promote a common understanding of this provision. We propose to repl ace the term “smoke management techniques” in §51.308(d)(3)(v)(E) with “basic smok e management practices.” We propose to replace the term “forestry management purposes” wit h “wildland vegetation management purposes” in recognition that not all wildland for which fire and smoke are issues is forested. We also propose to replace the phrase “plans” with “sm oke management programs for prescribed fire.” Like §51.308(d)(3)(v)(E), the proposed §51.3 08(f)(2)(vi)(E) would require states to consider only currently existing smoke management p rograms (formerly refered to as “plans”). Section IV.E discusses wildland fire-related issues in more detail and includes explanations of the terms “basic smoke management practices” and “s moke management program.”***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 48 of 142 C. Changes to Definitions and Terminology Related t o How Days Are Selected for Tracking Progress Section 51.308(d) of the existing Regional Haze Rul e requires states to determine the visibility conditions (in deciviews) for the averag e of the 20 percent least impaired and 20 percent most impaired visibility days over a specif ied time period at each of their Class I areas. Section 51.301 of the Regional Haze Rule defines vi sibility impairment as the humanly perceptible change in visibility from that which wo uld have existed under natural conditions. This definition of visibility impairment suggests t hat only visibility impacts from anthropogenic sources should be included when considering the deg ree of visibility impairment. However, the preamble to the 1999 final rule stated that the lea st and most impaired days were to be selected as the monitored days with the lowest and highest actu al deciview levels, respectively. 64 FR 35728 (July 1, 1999). The interpretation in the preamble was subsequently reflected in the EPA guidance on setting reasonable progress goals and t racking progress. In practice, in their SIPs for the first implementation period states followed the approach described in the 1999 preamble and the subsequent guidance, and the EPA approved the S IPs with respect to that aspect. However, as described later, experience now indicates that for the most impaired days an approach focusing on anthropogenic impairment in particular is more a ppropriate going forward. We are not proposing to change the approach of using the 20 pe rcent of days with the best visibility to represent good visibility conditions for reasonable progress goal and tracking purposes, but we are proposing text changes to accurately describe h ow those days are to be selected. These days would be referred to as the 20 percent clearest day s. Natural contributions to the total actual deciview levels vary from year to year. In order to minimize interannual variability, the Regional H aze Rule uses 5-year averages for determining***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 49 of 142 the baseline and current visibility conditions. Als o, under the EPA’s modeling guidance for regional haze SIPs, reasonable progress goals are p rojected starting from the average of visibility conditions in a 5-year period that is centered arou nd (or at least includes) the year of the base emission inventory used in the air quality modeling process. Now that many visibility monitoring sites have at least 15 years of data, it is clear t hat in some locations 5-year averages are not long enough to dampen the visibility impacts of occasion al extreme fire years. In their SIPs and SIP revisions for the first implementation period, some states explained that the 20 percent most impaired days in certain Class I areas can be domin ated by uncontrollable visibility impacts. Many states, particularly western states, have urge d the EPA to make rule changes that would allow them to track visibility progress in Class I areas using a method that is more closely linked with visibility impacts from controllable emissions

. To help states minimize the impacts of uncontrollab le emissions on visibility tracking, the EPA proposes to more explicitly (and consistent ly) address this issue for future implementation periods. In general, the proposed ch anges related to the selection of days for visibility tracking are intended to accomplish the following for future implementation periods: (1) clarify that “visibility impairment” means the deviation from natural visibility and therefore is due to anthropogenic impacts, (2) revise definit ions in §51.301 to make clear that the 20 percent most impaired days should be selected based on anthropogenic visibility impairment rather than based on the days with highest deciview values due to impacts from all types of sources, and (3) continue to use the 20 percent of days with the lowest total deciviews (i.e., “clearest days”) rather than the 20 percent least i mpaired days for purposes of tracking any adverse trend in visibility on clear days.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 50 of 142 The definitions in §51.301 for several terms and ph rases related to the selection of days for visibility tracking have been clarified in the proposed revisions of the rule text. Definitions that are proposed to be changed slightly to provide more clear explanations of their meanings include the following: deciview , most impaired days , and visibility impairment

. Additionally, we propose definitions for the follow ing previously undefined terms be included in §51.301: clearest days , the deciview index (the term was deciview haze index in the 1999 Regional Haze Rule), natural visibility conditions and visibility . We propose the addition of the term clearest days to unambiguously describe the days with the lowest actual deciview values, for which there is to be no degradation in visibility. 26 We propose changing the deciview haze index to the deciview index to remove the word haze, since the deciview index can be used for visibility impairment as well as for the total effect of all sources. 27 Visibility was previously undefined although used in the definitions of sever al other important terms, and so we have added a proposed definition to describe that visibi lity is the change in optical clarity when viewing objects at a distance. We also propose addi ng a definition for natural visibility conditions to clarify that natural visibility conditions cann ot be measured and must be inferred or estimated, and to distinguish the visibility condit ions that occur due to natural conditions from natural conditions themselves such as humidity, emi ssions from natural sources, etc.

26 We are not proposing to remove the definition of l east impaired days because it will still apply to the first implementation period (including the S IPs and progress reports covering the first implementation period). 27 We note that the very definition of “regional haze ” refers to “impairment,” making it confusing to use “haze” to refer to the actual leve l or degree of visibility considering the effects of both natural and anthropogenic sources. Our prop osed edits are aimed at avoiding any inconsistent use of the term “haze.”***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 51 of 142 Given the current Regional Haze Rule’s definitions of most impaired days and visibility impairment , the regulations could be read to direct states an d the EPA to use the days with the most perceptible anthropogenic impairment as the 20 percent most impaired days. The proposed changes to these definitions in §51.301 do not chan ge this direction. The EPA solicits comments on a first proposal, fully reflected in the propose d rule text, which would require that states select the 20 percent most impaired days based on anthropo genic impairment, rather than based on the highest deciview values due to all sources affectin g visibility. If this approach is finalized, states would still have the option to also present the vis ibility data using the current approach based on the days with the highest overall deciview index va lues (i.e., the 20 percent haziest days). Including this information in the SIP may help comm unicate to the public the magnitude of impacts from natural sources including wildland wil dfires and dust storms, and thus the utility of the change in approach. Under this first proposal, the reasonable progress goals and URP line that are calculated using anthropogenic impairment to select the most impaired days will be the glidepath that is used to trigger the requirement f or a state to show that it is not reasonable for th e SIP to provide for the rate of progress that would be needed to reach natural visibility conditions in 2064 ( see section IV.B of this document). The EPA seeks comment also on a second, alternative proposal under which the final rule would allow each state with a Class I area to choos e between using the revised approach described earlier (using the 20 percent most anthro pogenically impaired days) and using the 20 percent haziest days (whether dominated by natural or anthropogenic impacts) to track visibility as all states with Class I areas did in the first r egional haze SIPs. (This alternative approach is no t laid out in proposed rule text revisions, but only minor edits would be required to implement it in***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 52 of 142 the final rule.) If the final rule takes this appro ach, states would still have the option to also present the visibility data using the other approac h. In summary, the EPA seeks comment on two approaches for selecting the 20 percent “worst” days from the IMPROVE monitoring data, only one of which (or possibly another approach suggested in comments) would be incorporat ed into the final rule. In the first approach, states would be required to select the 20 percent m ost impaired days, i.e., the days with the most impairment from anthropogenic sources. This first a pproach would be a change from the approach states used in the first implementation pe riod. This first approach would also mean that all states would use a framework that is consistent on this aspect. In the second approach, states would be allowed to choose whether to select the 20 percent of days with the highest overall haze (i.e., the approach used in the first implemen tation period) or to select the 20 percent of days with the most impairment from anthropogenic so urces. The EPA will consider comments received on these two options or additional options offered by commenters. If the 20 percent most anthropogenically impaired d ays are used to estimate natural visibility conditions, current visibility condition s and the uniform rate of progress, they must also be used in setting reasonable progress goals and in progress reports. Conforming edits are being proposed to the provisions related to each of these , for that purpose. If the final rule requires the revised approach described earlier in the first pro posal, it would apply starting with the second and subsequent periodic comprehensive SIP revisions and then to progress reports submitted after the second SIP revision. There would be no ch ange with respect to the EPA action on SIP revisions for the first implementation period. In order to select the 20 percent most impaired day s based on the days with the most anthropogenic impairment, natural contributions to daily deciview values must be estimated by***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 53 of 142 some method. This in turn requires measured concent ration values for PM components to be allocated to natural versus anthropogenic sources. The EPA is not proposing that any particular method for determining natural contributions to dai ly haze and thus the degree of visibility impairment for each monitored day be codified in th e rule text. The EPA plans to issue guidance describing a recommended approach along with a proc ess for routinely providing relevant datasets for use by states when they develop their SIPs and progress reports. Because no particular method would be prescribed by rule, stat es could develop, justify and use another method in their SIPs, if the final rule requires (o r allows) the 20 percent most impaired days based on anthropogenic impairment to be used. D. Impacts on Visibility from Anthropogenic Sources Outside the U.S. The EPA acknowledges that emissions (natural and an thropogenic) from other countries (and from marine vessel activity in non-U.S. waters ) may impact Class I areas, especially those areas near borders and coastlines. We have had requ ests from states with such Class I areas that given these emissions are beyond states’ control, t he states should be allowed to account for international impacts when preparing SIPs and progr ess reports. For example, states have requested that they be allowed to consider impacts from international emissions when comparing their reasonable progress goals to the URP line. Th is comparison matters because (as described in section IV.C) it may trigger an additional analy tical requirement by the state. Impacts from international emissions can also affect whether a p rogress report will conclude that actual visibility conditions are approaching the reasonabl e progress goals for the end of the implementation period. It has been suggested to the EPA that estimated impacts from international emissions might be added to the 2064 end point of the URP line. It has also been***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 54 of 142 suggested that estimated impacts from international emissions be subtracted from baseline and current visibility conditions. On this issue, we first wish to clarify that it has never been the intention of the EPA that states be obligated to in any way compensate for ha ze impacts from international emissions by adopting more stringent emission controls on their own sources. We also wish to note that impacts from natural sources in other countries sho uld be considered part of natural visibility conditions. States have the flexibility under the R egional Haze Rule to justify and use values for natural visibility conditions that include such eff ects. We believe the proposed changes regarding which days in a year are used for tracking progress ( see section IV.C), when supplemented by our planned guidance on this topic, will adequately address international impacts related to significant wildland wildfires in Canada and Mexico and dust storms in Mexico (and perhaps also dust storms in northern Africa). The EPA has further considered possible approaches regarding the impacts from anthropogenic sources in other countries, including border countries as well as more distant countries such as China. It is the role of the fede ral government, much more than of the states, to work with other countries to make such reasonable p rogress. The EPA is, in fact, actively engaged with other countries to help them reduce th eir anthropogenic emissions, particularly emissions in Mexico from sources near the U.S.-Mexi co border. See http://www2.epa.gov/border2020

. We believe that it may be appropriate to allow stat es to adjust the reasonable progress goal framework, including their progress reports, t o explicitly take into account international impacts from anthropogenic sources, but only when a nd if these impacts can be estimated with sufficient accuracy. We do not believe that explici t consideration of impacts from anthropogenic***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 55 of 142 sources outside the U.S. would actually affect the conclusions that states should make about what emission controls for their own sources are needed for reasonable progress. Even so, explicit quantification of international impacts, if accurat e, could improve public understanding and effective participation in the development of regio nal haze SIPs. Also, taking international impacts into account in some cases may affect wheth er a state (and contributing states) are subject to the requirement of proposed §51.308(f)(3 )(ii) regarding a demonstration that there are not additional emission reduction measures needed f or reasonable progress. However, we are not convinced that such impacts can be estimated with s ufficient accuracy at this time, in part due to great uncertainty about past, present and future em issions from sources in most other countries. However, it may be that by the time some future per iodic comprehensive SIP revisions are to be prepared, for some states possibly as early as when they are preparing their second SIP, methods and data for estimating international impacts will be substantially more robust. Therefore, the EPA is requesting comment on a propo sed provision that would allow states with Class I areas significantly impacted by international emissions to make an adjustment to the uniform rate of progress with specific appro val by the Administrator. The adjustment would consist of adding to the value of natural vis ibility conditions an estimate of international impacts, only for the purpose of calculating the un iform rate of progress. 28 We believe that this

28 As another possible approach to accounting for inte rnational impacts, the analysis of IMPROVE monitoring data to develop the estimates of 2000-2004 baseline visibility conditions could include steps to remove the influence of emis sions from anthropogenic sources outside the U.S. The calculation of the uniform rate of progres s would be based on this adjusted estimate of baseline visibility conditions (see “ The URP line starts at 2000-2004, for every impleme ntation period “ in section IV.B) and the true value of natural v isibility conditions. Also, for consistency, the values for current visibility conditions and fo r the projected RPG would exclude the influence of international emissions. We invite com ment on this alternative approach, which we may include in the final rule as the only allowed a pproach or as another allowed approach.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 56 of 142 adjustment should be permitted only if the internat ional impacts have been estimated with methods and data approved by the Administrator as s cientifically valid. We are proposing specific rule text for this purpose in §51.308(f)(1 )(vi). In addition, we are proposing small rule text changes in §51.308(f)(1)(i) and (vi) to remove “needed to attain natural visibility conditions” from the reference to “uniform rate of progress,” b ecause when adjusted to reflect international impacts the “uniform rate of progress” would not be the rate of progress that would reach true natural visibility conditions. Because the manner i n which a state with a Class I area calculates the uniform rate of progress may affect other state s with sources that contribute to visibility impairment at the Class I area 29 , we recommend that a state seeking approval for su ch an adjustment first consult with contributing states. Such an adjustment would also be a topic for the required consultation with the FLM for the Class I area at issue. We welcome comments on this proposed rule text as well as comments in general s upport or opposition to this concept, noting that the EPA may or may not finalize this portion o f the proposal. E. Impacts on Visibility from Wildland Fires Within the U.S. Fires in wildlandon wildlands within the U.S. can significantly impact visibilit y in some Class I areas on some days and have lesser impacts on a greater number of days. Accordingly, we discuss here whether measures to reduce emission s from wildland wildfire and wildland prescribed fires may be needed for reasonable progr ess towards natural visibility conditions. Similar to transported emissions from other countri es discussed in section IV.D, we also discuss whether smoke from fires might cause the projected RPG to be above the URP line, thus

29 Contributing states may be affected because under proposed §51.308(f)(3)(iv)(B), a contributing state may have an additional analytica l requirement if the RPG does not provide for the uniform rate of progress at an affected Class I area in another state. Formatted: Highlight***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 57 of 142 triggering the additional analytical requirement (d iscussed in section IV.B) to show that there are no additional measures that are necessary for reaso nable progress. We are proposing rule language to allow the Administrator to approve a st ate’s proposal to adjust the RPG and URP framework to avoid subjecting a state to this addit ional analytical requirement due only to the impacts of specific types of wildland fire. Before presenting this proposal, we provide background on wildland fire concepts. This section does not address and does not apply to fires of any type on lands other than wildland or to burn ing on wildland that is for purposes of commercial logging slash disposal rather than wildl and ecosystem health and public safety. Background on wildland fire . Fires on wildland play an important ecological ro le across the globe, benefiting those plant and animal specie s that depend upon natural fires for propagation, habitat restoration and reproduction. Wildland can include forestland, 30 shrubland, 31 grassland 32 and wetlands. 33 Fires on wildland can be of two types: wildfire (u nplanned) and prescribed fire (intentionally ignited for manageme nt purposes including ecosystem health and to reduce the risk of catastrophic wildfires). The EPA anticipates that wildfires will become more frequent in wildlandon wildlands in the future due to the natural accumulation of f uels in the

30 Forestland is land on which the vegetation is domi nated by trees or, if trees are lacking, the land shows historic evidence of former forest and h as not been converted to other uses. Definition available at https://globalrangelands. 31 Shrubland is land on which the vegetation is domin ated by shrubs. Definition available at https://globalrangelands.org/rangelandswest/ glossa ry. 32 Grassland is land on which the vegetation is domin ated by grasses, grass like plants, and/or forbs. Definition available at https://globalrange lands.org/rangelandswest/glossa ry. 33 Wetlands, as defined in 40 CFR 230.3(t), means tho se areas that are inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetatio n typically adapted for life in saturated soil conditions. Wetlands generally include swamps, mars hes, bogs and similar areas. Formatted: Highlight***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 58 of 142 absence of fire, and due to climate change that is leading to increased incidence of wildfire, 34 which may necessitate land managers employing presc ribed fire more frequently to manage fuel loads and achieve other benefits as described below

. 35, 36 Wildfire emissions account for a large portion of d irect PM 2.5 emissions nationally and can contribute to periodic high leve ls of PM 2.5 and PM 10 levels which reduce visibility. Wildfires also emit volatile organic co mpounds and NOx, which are precursors to
PM 2.5 and PM 10 (and to ozone, which does not affect visibility). Besides their effect on air quality, wildfires pose a direct threat to public s afety. Changes in wildfire risk and occurrence are closely associated with the lack of periodic fi re in fire-dependent ecosystems, demographic changes and associated infrastructure investment at the margins of wildland and, as already noted, climate change and climate variability. The threat from wildfires can be mitigated through management of wildland vegetation. Attempts to supp ress wildfires have resulted in unintended consequences, especially the buildup of fuel loads, which can create a lingering fire liability that will eventually find resolution, unplanned or plann ed. Unplanned fires in areas with high fuel loads present high risks to both humans and ecosyst ems. 37 Planned prescribed fires and letting

34 The Administrator’s finding on the adverse effects of greenhouse gases included the observation that wildfires have increased, and that there are potential serious adverse impacts from further wildfire occurrence. 74 FR 66530 (Dece mber 15, 2009). 35 Climate Change in the United States: Benefits of Gl obal Action, U.S. EPA, EPA–430–R–15– 001, June 2015. Available at http://www2.epa.gov/cira. 36 The National Strategy: The Final Phase in the Deve lopment of the National Cohesive Wildland Fire Management Strategy, Report to Congre ss developed by the U.S. Department of Agriculture and the U.S. Department of the Interior , April 2014. Available at h ttp://www.forestsandrangelands.gov/ strategy/thestr ategy.shtml. 37 Indeed, ‘‘fire policy that focuses on [wildfire] s uppression only, delays the inevitable, promising more dangerous and destructive future . . . fires.’’ Stephens, SL; Agee, JK; Fule, PZ; North, MP; Romme, WH; Swetnam, TW. (2013). Managing Forests and Fire in Changing Climates. Science 342: 41–42.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 59 of 142 some wildfires proceed naturally (typically those w ith lower fire intensity and severity) are tools that land managers can use to reduce fuel load, unn atural understory and tree density, thus helping to reduce the risk of catastrophic wildfire s. Allowing some wildfires to continue to burn even though they could be suppressed and the though tful use of prescribed fire can influence the occurrence, size and severity of catastrophic wildf ires, which may lead to improved public safety, improved protection of property and an over all reduction in fire-induced smoke impacts and subsequent health effects. Thus, appropriate us e of prescribed fire may help manage the contribution of wildfires to both background and pe ak PM (and ozone) air pollution. However, prescribed fires themselves can affect visibility i n Class I areas. Wildfires tend to occur in the summer when conditions for wildfire are favorable. Land managers tend to conduct prescribed fires at other times to reduce the risk of a prescr ibed fire escaping during favorable wildfire conditions in the summer. There are, of course, exc eptions to this seasonal pattern. In addition to reducing wildfire risks to humans an d ecosystems and wildfire contributions to air pollution including poor visib ility, prescribed fires can benefit those plant and animal species that depend upon natural fires f or propagation, habitat restoration and reproduction, as well as benefits to a myriad of ec osystem functions (e.g., carbon sequestration, maintenance of water supply systems and endangered species habitat maintenance). The EPA understands the importance of prescribed fire, whic h mimics a natural process necessary to manage and maintain fire-adapted ecosystems and cli mate change adaptation, while reducing risk to public safety and the risk of uncontrolled emissions and ecosystem damage from catastrophic wildfires. The EPA is committed to wor king with FLMs, other federal agencies, tribes, states and private landowners to effectivel y manage prescribed fire use to reduce the impact of catastrophic wildfire-related emissions o n PM 10 and PM 2.5 (and ozone).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 60 of 142 Basic smoke management practices are types of actio ns that the manager of a prescribed fire can take to reduce the amount of smoke generat ed by a prescribed fire and/or to reduce public exposure to the smoke that is generated. The se practices are described in more detail in a publication issued by federal agencies that use pre scribed fire as part of their land management
programs. 38 While we are not proposing to define basic smoke m anagement practices within the Regional Haze Rule, we are providing as guidance, i n Table 1, a summary of six common basic smoke management practices. Table 1 - Summary of Basic Smoke Management Practic es, benefit achieved with the practice, and when it is applied a

Basic Smoke Management Practice Benefit achieved with the BSMP When the BSMP is Applied

– Before/During/After the

Burn Evaluate Smoke Dispersion Conditions. Minimize smoke impacts. Before, During, After.
Monitor Effects on Air Quality. Be aware of where the smoke is going and degree it impacts air quality. Before, During, After.

Record-Keeping/Maintain a Burn/Smoke Journal. Retain information about the weather, burn and smoke. If air quality problems occur, documentation helps analyze and address air regulatory issues. Before, During, After.

Communication – Public Notification. Notify neighbors and those potentially impacted by smoke, especially sensitive receptors. Before, During.

Consider Emission Reduction Techniques. Reduce emissions through mechanisms such as reducing fuel loading can reduce downwind impacts. Before, During, After.

Share the Airshed – Coordination of Area Burning. Coordinate multiple burns in the area to manage exposure of the public to smoke. Before, During, After.

38 USDA Forest Service and Natural Resources Conserva tion Service, Basic Smoke Management Practices Tech Note, October 2011, http://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/ste lprdb1046311.pdf***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 61 of 142 a E lements of these BSMP could also be beneficial to a pply to wildfires for areas likely to experience recurring wildfires.
The term “smoke management program” has been used i n several ways within the air quality and land management communities, but is not currently defined in the Regional Haze Rule or used in §51.308. 39 We are proposing to define a smoke management prog ram for the purposes of the Regional Haze Rule, within §51.301, as being a framework to minimize the impact of smoke from prescribed agricultural and/or wildland management burning operations that includes enforceable restrictions on prescribe d fire. The restriction on prescribed fire could consist of a requirement for a specific permit or p ermission issued for the particular fire, or a provision in the rules of the program could allow a ny land owner or manager to burn during a time period for which it has been announced that co nditions are anticipated to be favorable to smoke dispersion. A definition of smoke management program would provide more clarity to the Regional Haze rule because proposed §51.308(f)(2)(v )(E) would make a certain state obligation depend on whether a “smoke management program” curr ently exists within a state. See

“ Consideration of control measures for wildland pres cribed fire” in this section for further discussion of this point. We do not intend the term smoke management program to include a program that includes only a seasonal restriction on burning bec ause of fire safety concerns or a voluntary educational program designed to raise air quality a wareness of potential prescribed fire users. This distinction is intended to avoid misunderstand ings due to use of inconsistent terminology.

39 However, §51.309(d)(6)(i) and (iv), under which fo ur western states submitted SIPs for the first implementation period, do refer to enhanced s moke management programs. This section does not apply to SIPs for subsequent implementatio n periods.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 62 of 142 The EPA supports both fire safety restrictions and educational programs, but we do not intend the Regional Haze Rule to be a vehicle for encourag ing or requiring states to implement such programs. Smoke management programs commonly includ e a significant education and outreach component and may be administered by the same state or local agencies that enforce safetyrelated restrictions on prescribed fire and open bu rning. We also note that in our recent proposal to revise the Exceptional Events Rule 40 , we proposed (as a matter of guidance but not rule text) that a smoke management program would have to have six elements in order to be considered a “state certified smoke management program” (in addi tion to the requirement that a state official has certified the program). One of those six elemen ts is the regulatory element that is the single distinguishing feature of a smoke management progra m in the proposed definition for the purposes of the Regional Haze Rule. The other five elements are minimizing air pollutant emissions, smoke management components of burn plan s, public education and awareness, surveillance and enforcement, and program evaluatio n. We support states considering making all six elements as part of any smoke management plan. We also believe that all six elements are important in a “state-certified smoke management pr ogram” for purposes of the Exceptional Events Rule because of the special status of a “sta te-certified smoke management program” under the Exceptional Events Rule as one path to sa tisfying the requirement that a prescribed fire event be not reasonably controllable or preventable . In the context of regional haze, however, we are not incorporating the additional five elements into the definition of a smoke management program because we believe that the existence of a program lacking one or more of these elements should trigger the obligation for a state to consider improvement to the program as part

40 Treatment of Data Influenced by Exceptional Events ; Proposed Rule, 80 FR 72840, November 20, 2015.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 63 of 142 of developing its long-term strategy. See “ Consideration of control measures for wildland prescribed fire” in this section for further discussion of this poin t. The recently proposed revisions to the Exceptional Events Rule would clarify that in the context of the regulatory programs for the protecti on of the NAAQS, (i) wildland wildfires are natural events and prescribed fires are anthropogen ic events; (ii) a wildland wildfire is not controllable or preventable (in the sense that gene rally it would not be reasonable to expect efforts at prevention of occurrence and/or control of emissions to have gone beyond the efforts actually made for a given wildfire by responsible l and managers and fire safety officials); (iii) a prescribed fire is not reasonably controllable (in the sense that it would not have been reasonable to do more to control its emissions) if it was cond ucted in accordance with a state-certified smoke management plan or if the burn manager has em ployed appropriate basic smoke management practices; and (iv) a prescribed fire is presumptively not reasonably preventable (in the sense that it not would have been reasonable to not conduct it, because of the multiple important benefits that would have been foregone) i fa multi-year land or resource management plan for a wildland area has a stated objective to establish, restore and/or maintain a sustainable and resilient wildland ecosystem and/or to preserve endangered or threatened species through a program of prescribed fire and the use of prescribe d fire in the area has not exceeded the frequency indicated in that plan. Today’s proposed revisions to the Regional Haze Rule do not include language to these same four effects because the Regional Haze Rule does not contain this level of specificity with respect to any source typ e. However, we do believe these same propositions apply in the regional haze context, an d the remainder of this section is based on these propositions. We invite comment on these prop ositions, and on whether it is appropriate to include in the final rule explicit language reflect ing them.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 64 of 142 Wildland Wildfires As natural events, two issues are associated with w ildfires on wildland. The first is whether and how a state is obligated to consider me asures which could reduce emissions from these wildfires. The second issue is the one identi fied at the start of this section, namely the possible impact of wildland wildfires on whether th e RPG is above the URP line and thus whether a state is subject to the additional analyt ical requirement described section IV.B. Consideration of control measures for wildland wild fires. Because wildland wildfires are considered natural events, emissions from wildfires are natural emissions that contribute to natural reductions in visibility. Thus, states are not obligated to consider whether measures to reduce emissions from wildfires are necessary for r easonable progress towards natural visibility conditions. However, we encourage states to conside r how use of prescribed fire may reduce the frequency, geographic scale and intensity of natura l wildfires, such that vistas in Class I areas will be clearer on more days of the year, to the en joyment of visitors. We believe appropriate use of prescribed fire needed for ecosystem health and to protect life and property from wildfires, with best smoke management practices applied, shoul d be encouraged by EPA rules and policies, and that potentially unnecessary barriers to its us e should be reassessed by the responsible authorities with input from land managers, affected communities and stakeholders. Possible effect on the comparison of the RPG to the URP line. Because wildland wildfires are natural events, emissions from wildla nd wildfires do not contribute to “visibility impairment” given that this term refers only to red uctions in visibility attributable to anthropogenic sources. Under the proposed approach of basing RPGs on the 20 percent most impaired days, we expect that days with large impac ts from wildland wildfires will not be***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 65 of 142 included in the set of days selected as the 20 perc ent most impaired days in each year. 41 Thus, we expect that wildland wildfires with notable effects on visibility will not be a reason why a projected RPG for the 20 percent most impaired days would be above the URP line, simply because the URP line will be about visibility on ot her types of days. Thus, we expect that wildland wildfires will not affect whether a state becomes subject to the additional analytical requirement to show that there are no additional me asures that are necessary for reasonable progress. Also, we expect that the 20 percent clear est days (selection of which is based on visibility as affected by all types of sources) wil l not include any days with notable effects from wildland wildfires. Thus, we expect that wildland w ildfires will not affect whether a state is able to demonstrate that there is no deterioration in vi sibility on the 20 percent clearest days, which is a requirement for SIP approval. Wildland Prescribed Fires As anthropogenic events, two issues are associated with prescribed fires on wildland. The first is whether and how a state is obligated to co nsider measures which could reduce emissions from these prescribed fires. The second issue is th e possible impact of wildland prescribed fires on whether the RPG is above the URP line. Consideration of control measures for wildland pres cribed fire . Under existing §51.308(d)(2)(i) and proposed revised §51.308(f)(2) (v), a state is required to identify all anthropogenic sources of visibility impairment cons idered by the state in developing its long-

41 We intend to recommend an approach to identifying the 20 percent most impaired days that uses the ambient concentration of carbon-containing material to separate total light extinction between natural sources, including wildfires, and a nthropogenic sources. A day strongly affected by wildfire will have high concentrations of carbon -containing material and a very large fraction of light extinction will be attributed to natural c auses, thus the day likely will not be one of the 20 percent most impaired days.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 66 of 142 term strategy and the criteria used to select the s ources for which additional emission reduction measures were considered in light of the four reaso nable progress factors. Existing §51.308(d)(3)(v)(E) more specifically requires a st ate to consider “smoke management techniques for agricultural and forestry management purposes including plans as currently exist within the State for these purposes.” As explained in section IV.B, in carrying this paragraph forward into the revision of §51.308(f) that will m ake it free standing, we are proposing to update some of the terminology but not the meaning of this paragraph. Proposed §51.308(f)(2)(v)(E) would require states to conside r “basic smoke management practices for prescribed fire used for agricultural and wildland vegetation management purposes and smoke management programs as currently exist within the s tate for these purposes.” Taken together, we interpret these provisions to me an that every state must consider whether wildland prescribed fires contribute to imp airment at their own Class I areas or Class I areas in other states. If they do not contribute to any meaningful degree, the SIP may take note of this and thereby satisfy both provisions. If prescr ibed fires in a state contribute meaningfully to impairment at a Class I area, the state is required to consider basic smoke management practices for prescribed fires in the development of its long -term strategy, regardless of whether or not those practices are currently being implemented, re quired by state law or mandated by an EPAapproved SIP. The state would be required to consid er only smoke management programs as currently exist within the state. 42 We believe that the state should in this situation give new consideration to the effectiveness of its smoke man agement programs in protecting air quality

42 We interpret “currently exist” in both referenced sections of the Regional Haze Rule to refer to programs that are operational as of the SIP due dat e, not the date the Regional Haze Rule was promulgated.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 67 of 142 while also allowing appropriate prescribed fire for ecosystem health. The state could also consider the implementation of a new smoke manageme nt program. We would like to make clear that taken together, th ese two provisions do not necessarily require any state to “select” wildland prescribed f ire (under §51.308(f)(2)(v)) as an anthropogenic source of visibility impairment for w hich it must consider and analyze emission reduction measures (such as a smoke management prog ram and basic smoke management practices) based on the four reasonable progress fa ctors listed in §51.308(f)(2)(i). Thus, a state is not necessarily required to develop cost estimates for smoke management programs or basic smoke management practices. However, if a state doe s not “select” wildland prescribed fire as a source for four-factor analysis, it must explain wh y it has not. As previously stated, the explanation may be as simple as taking note that pr escribed fires do not make a meaningful contribution to visibility impairment at in-state a nd nearby Class I areas. Where prescribed fires are more important, it may be sufficient for the SI P revision to explain the role of properly planned and managed prescribed fire as described in this section, the state’s ongoing smoke management programs, if any, and the current and po ssibly increased future use of basic smoke management practices by federal, state, local and p rivate land managers, but not to “select” wildland prescribed fire as a source category for f our-factor analysis. If a state does “select” wildland prescribed fire a s a source for four-factor analysis, the state must conclude this analysis by determining wh ether additional measures to reduce emissions from wildland prescribed fire are necessa ry for reasonable progress. Any such measures must be included in the long-term strategy . Because some of the basic smoke management practices are difficult to describe with the specificity needed to make them practically enforceable, it may not be appropriate to conclude that a SIP requirement for the use***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 68 of 142 of each practice is necessary for reasonable progre ss. For example, one basic smoke management practice is to monitor the effects on air quality d ue to the smoke plume from a prescribed fire. “Monitoring” could include ground-based visual obse rvations, aircraft observations, meteorology-based modeling, fixed or portable air q uality monitoring stations, hand-held monitors, etc. Because the most appropriate monitor ing approach is often situation and resourcespecific, mandating a specific approach is inadvisa ble. Further, requiring a prescribed fire manager to document that a required monitoring appr oach was used could distract resources from managing the prescribed fire and communicating with potentially affected members of the public. Therefore, a SIP commitment for a state or local agency to promote the use of basic smoke management practices could be more desirable than a SIP requirement for land managers to use each basic smoke management practice. Although not required to select prescribed fires as a source category subject to four-factor analysis, if the state elects to do so, then given the benefits of prescribed fires including the reduction they can achieve in visibility-obscuring smoke from wildfires, a state may determine that reasonable progress does not require implement ation of a new smoke management program, or it may adopt a smoke management program designed so that it does not inappropriately restrict prescribed fires with these benefits. If a state determines that compliance with a smoke management program of a particular design is requir ed for reasonable progress, then the state should include the smoke management program in the SIP as part of the long-term strategy. We believe that states can include sufficiently detail ed, enforceable language in their smoke management programs to make them practicably enforc eable for SIP purposes (as may not be the case for all basic smoke management practices).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 69 of 142 While the Regional Haze Rule thus does not require regional haze SIPs to include measures to limit emissions from prescribed fire, i t is not our intention to in any way discourage federal, state, local or tribal agencies or private land owners from taking situation-appropriate steps to minimize emissions from prescribed fires o n wildland, or other types of land. The EPA joins the FLMs in encouraging all land owners and m anagers to apply appropriate basic smoke management practices to reduce emissions from presc ribed fires. The EPA understands that the FLMs will be apply these measures routinely and wil l be available to consult with other agencies and private parties interested in doing the same. W e also encourage any state with an existing smoke management program or considering the adoptio n of a smoke management program to consider how its provisions may affect the ability of land owners and managers to apply prescribed fire where it is needed for wildland eco system health and to reduce the risk of catastrophic wildfires as discussed earlier in this section. Possible effect on the comparison of the RPG to the URP line . Prescribed fire in wildlandon wildlands may contribute to impairment on some of the days t hat are among the 20 percent most impaired days. Therefore, the issue of whether prescribed fires might cause the projected RPG to be above the URP line is germane. Generally, as discussed earlier in this section, we do not expect the total acreage subject to prescribed fires in wildlandon wildlands to decrease in the future because prescribed fire is needed for ecosystem health and to reduce the risk of catastrophic wildfires. Thus, the occurrence of prescribed fire generally will not be projected to decline towards zero by 2064, nor to decline over any one implementation period at th e proportional rate inherently assumed in the URP line. In fact, in many areas there may be reaso n to adopt policies that facilitate, and accordingly to forecast for purposes of setting the RPG, more use of prescribed fire and thus Formatted: Highlight

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Page 70 of 142 higher contributions to impairment on the 20 percen t most impaired days. At this time, we do not know whether or where such a projected trend may af fect whether the RPG for a Class I area will be above the URP line. However, we expect that if t his is an issue, western Class I areas would be the more likely to be affected. If the projected RPG for a Class I area is above th e URP line due only to the anticipated use of wildland prescribed fire needed for ecosyste m health and safety, we do not believe that states should expend valuable analytical and decisi on making resources on additional analysis of measures necessary for reasonable progress if they have otherwise satisfied the terms of the Regional Haze Rule. Therefore, as in the case of im pacts from sources in other countries as discussed in section IV.D, we are requesting commen t on a proposed provision in §51.308(f)(1)(vi) that would allow states with Clas s I areas significantly impacted by emissions from wildland prescribed fires to make an adjustmen t to the uniform rate of progress with specific approval by the Administrator. The adjustm ent would consist of adding to the value of natural visibility conditions an estimate of wildla nd prescribed fire impacts, only for the purpose of calculating the uniform rate of progress and onl y for prescribed fires that were conducted under multi-year land or resource management plans (including fire management plans, prescribed fire on wildland management plans, lands cape management plans or equivalent public planning documents, e.g., plans developed for the C ollaborative Forest Landscape Restoration Program, as well as State Forest Action Plans, mand ated by the 2008 Farm Bill) for wildland areas that have a stated objective to establish, re store and/or maintain a sustainable and resilient wildland ecosystems , and/or to preserve endangered or threatened species throug h a program of prescribed fire , and/or to reduce the risk of catastrophic wildfir es and that provide for the use of appropriate basic smoke management practices. FLMs prepare such multi-year management Formatted: Highlight

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Page 71 of 142 plans for the areas they manage. We would also cons ider a fire management plan for tribal or private lands that has been reviewed and certified by the appropriate fire and/or resource management professionals and agreed to and followed by the land owner/manager to be sufficient to meet this restriction on the scope of the adjustment to the uniform rate of progress. We believe that this adjustment should be permitted only if such prescribed fire impacts have been estimated with methods and data approved by th e Administrator as scientifically valid. 43 We are also proposing changes to fire-related defin itions in §51.301. One of the proposed changes is to remove the term “prescribed natural f ire” for the definition of “fire” because we consider prescribed fires to be anthropogenic, alth ough we recognize that some prescribed fires are merely substitutes for natural wildfire that wo uld otherwise occur at some point in time. In addition, we are adding definitions for wildland, w ildfire and prescribed fire. The proposed definitions are consistent with the definitions we recently proposed for inclusion in the Exceptional Events Rule. F. Clarification of and Changes to the Required Con tent of Progress Reports The EPA believes that additional amendments to §51. 308(g) are appropriate at this time in order to clarify the substance of the regional h aze progress reports. In its current form, there is ambiguity in this section with respect to the perio d to be used for calculating current visibility conditions, as well as ambiguity with respect to wh ether forward-looking, quantitative modeling is required in the progress reports to assess wheth er reasonable progress goals will be met. The EPA wishes to clarify both of these and other issue s, and so proposes to amend §51.308(g) in the

43 The invitation, in the context of international im pacts, for comment on alternative adjustment approaches also applies to this proposal regarding an adjustment to account for prescribed fire impacts. Our recommendation for consultation with o ther states and FLMs in the same context also applies to prescribed fire impacts.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 72 of 142 following ways. The EPA seeks comment on these prop osed amendments as well as alternative approaches. Section 51.308(g)(3)(ii) is proposed to be amended by adding a number of explanatory sentences to better indicate what “current visibili ty conditions” are and how to calculate them. Under the current version of the rule, it is not cl ear what “current visibility conditions” are, in part because the term is not defined in §51.301. Al though §51.308(g)(3) makes reference to 5- year averages of annual values for most impaired an d least impaired days, and §51.308(g)(3)(i) requires states to assess current visibility condit ions for the most impaired and least impaired days, there is no clear indication as to which 5-ye ar average the state should and can practicably use in a progress report for the current visibility conditions calculation. For example, the “current conditions” terminology does not explicitly allow f or the time delay needed for the IMPROVE network manager to get quality assured data into it s database so they are accessible to the states preparing progress reports. Practicality requires t hat “current conditions” should mean “conditions for the most recent period of available data.” 44 There is also an issue of whether this availability is to be determined based on the start of work on the progress report, the due date for the progress report, or the actual submission date of the progress report. The proposed text makes clear that the period for calculating current visib ility conditions is the most recent rolling 5-year period for which IMPROVE data are available as of a date 6 months preceding the required date of the progress report. Because we are also proposi ng that progress reports no longer be

44 In our guidance on the preparation of progress rep orts, the EPA has indicated that for “current visibility conditions,” the reports should include the 5-year average that includes the most recent quality assured public data available at the time t he state submits its 5-year progress report for public review. See section II.C of General Principles for the 5-Year Regional Haze Progress Reports for the Initial Regional Haze State Impleme ntation Plans, April 2013.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 73 of 142 submitted as SIP revisions, meaning that there woul d be a much simpler and expeditious state administrative process to submit a progress report once technical work on it is completed, we believe that this 6-month period would be sufficien t for states to incorporate the most recent available data into their progress reports. 45 The EPA invites comment on other specific timeframes as the amount of time necessary for stat es to incorporate the most recent available data into their progress reports, including 3 month s, 9 months and 12 months. Section 51.308(g)(3)(iii), as currently written, re quires a progress report to contain the value of the change in visibility impairment for th e most and least impaired days over the past 5 years. This text fails to make clear what the “past 5 years” are for assessing the change in visibility impairment. Because of data reporting de lays, the period covered by available monitoring data will not line up with the periods d efined by the submission dates for progress reports. Moreover, it is important to ensure that e ach year of visibility information is included either in a periodic comprehensive SIP revision or the progress report that follows it. Therefore, the “past 5 years” text is proposed to be deleted a nd replaced with text indicating the change in visibility impairment is to be assessed over the pe riod since the period addressed in the most recent periodic comprehensive SIP revision. The same change to existing “past 5 years” text is proposed to be made to the first sentence of §51.308(g)(4) for the purposes of repor ting changes in emissions of pollutants contributing to visibility impairment, for similar reasons. Like monitoring trend summaries, available emissions trend summaries will not line u p with the periods defined by the submission

45 Note that we are not proposing this specification of 6 months for the progress report aspects of a periodic comprehensive SIP revision ( see section IV.C), in light of the longer time needed for administrative steps between completion of technica l work and submission to the EPA.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 74 of 142 dates of progress reports. Therefore, the proposed language removes the “past 5 years” text and replaces it with text indicating the change in emis sions of pollutants contributing to visibility impairment is to be assessed over the period since the period addressed in the most recent periodic comprehensive SIP revision. The final sentence of §51.308(g)(4) is proposed to be modified to revise and clarify the obligation of states regarding emissions inventorie s. The current rule text directs the analysis be based on the “most recent updated emissions invento ry,” with emissions estimates “projected forward as necessary and appropriate to account for emissions changes during the applicable 5- year period.” States are otherwise required by 40 C FR part 51, subpart A (Air Emissions Reporting Requirements) to prepare complete emissio n inventories only for every third calendar year (2011, 2014, etc.) and to submit these invento ries to the EPA’s National Emissions Inventory (NEI). (After aggregating and quality ass uring these submissions, the EPA then publicly provides summaries of the inventories that have been submitted.) The current text of §51.308(g)(4) seemingly requires a state to “projec t” the most recent of these inventories to the end of the “applicable 5-year period” whenever that end is not the year of a triennial inventory required by subpart A. Emissions projection is not a simple or low-resource task even if limited to a projection date that is in the recent past, as would be the case here. We do not think the informational value of such projections is in balan ce with the effort and time that would be required. At the same time, we believe that progres s reports should present for each significant source sector the most recently available informati on, which may be newer for some sectors than for others. For most sectors, this will be the info rmation for the triennial year of the most recent NEI submission. However, the EPA operates a data sy stem that provides information on emissions from electric generating units (EGUs), wh ich account for a significant percentage of***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 75 of 142 visibility impairing pollution in many states, with only a few months lag time. This information comes from reports submitted by the EGU operators b ased on continuous emissions monitoring systems. Therefore, we are proposing text changes t hat explain clearly the most recent year through which the emissions analysis must be extend ed, by sector. States would be required to include in their progress reports emissions with re spect to all sources and activities up to the triennial year for which information has already be en submitted to the NEI. With regard to EGUs, states would need to include data up to the m ost recent year for which the EPA has provided a state-level summary of such EGU-reported data. Finally, the last sentence of the proposed text for this section makes clear that if emission estimation methods have changed from one reporting year to the next, states need not bac kcast, i.e., use the newest methods to repeat the estimation of emissions in earlier years, in order to create a consistent trend line over the whole period. The EPA has never expected states to backca st in this context, but some states have expressed concern that other parties may interpret the current Regional Haze Rule as requiring such backcasting. This final change would remove an y uncertainty about the sufficiency of a state’s progress report. Section 51.308(g)(5) involves assessments of any si gnificant changes in anthropogenic emissions that have occurred, and is proposed to be changed in a similar fashion to other sections, deleting the reference to the “past 5 yea rs” and instead directing that the period to be assessed involves that since the last periodic comp rehensive SIP revision. Text is also proposed to be added that would require states to report whe ther these changes were anticipated in the most recent SIP. Having this explanation within the progress report should not be a significant burden on the state and will assist the FLMs, the p ublic and the EPA in understanding the***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 76 of 142 significance of any change in emissions for the ade quacy of the SIP to achieve established visibility improvement goals. Proposed changes to §51.308(g)(6) regarding assessm ent of progress toward meeting reasonable progress goals would clarify that the re asonable progress goals to be assessed are those established for the period covered by the mos t recent periodic comprehensive SIP revision. This does not change the intended meaning of this s ection, and only clarifies that in a progress report, a state is not required to look forward to visibility conditions beyond the end of the current implementation period. A final proposed change to §51.308(g) is to remove §51.308(g)(7) entirely, relieving the state of the need to review its visibility monitori ng strategy within the context of the progress report. This change was requested by many states du ring our pre-proposal consultations, and is appropriate in our view. Because all states current ly rely on their participation in the IMPROVE monitoring program and expect to continue to do so, continuing the requirement for every state to submit a distinct monitoring strategy element in each progress report would consume state and EPA resources with little or no practical value for visibility protection. As needed, the EPA will work with involved states and the IMPROVE Steering Committee to address any needed changes in the visibility monitoring program. It should be noted that minor changes are proposed to §51.308(h) regarding actions the state is required to take based on the progress rep ort. These changes merely remove the implication that all progress reports are to be sub mitted at 5-year intervals, and improve public understanding of the declaration that a state must make when it determines that no SIP revisions are required by removing the word “negative.” Minor changes are also proposed to §51.308(i) in order to create a stand-alone requirement that stat es must consult with FLMs regarding progress***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 77 of 142 reports. This stand-alone requirement is needed if progress reports are not SIP revisions, because at present the FLM consultation requirements are ap plicable only to SIP revisions. G. Changes to Reasonably Attributable Visibility Im pairment Provisions The EPA is proposing extensive changes to 40 CFR 51 .300 through 51.308 in regard to reasonably attributable visibility impairment. As d iscussed in section III of this document, the reasonably attributable visibility impairment provi sions were originally promulgated in 1980, when technology for evaluating visibility impairmen t and its causes was in its infancy and visual observation of “plume blight” was the main method o f determining whether a source was affecting a mandatory Class I area. Since that time , there have been many advances in ambient monitoring, emissions quantification, emission cont rol technology and meteorological and air quality modeling. These advances have been built in to the regional haze program, such that state compliance with the Regional Haze Rule’s requiremen ts will largely ensure that progress is made towards the goal of natural visibility conditi ons. Therefore, it is likely that some aspects of the reasonably attributable visibility impairment p rovisions of the visibility regulations have less potential benefit than they did when they originall y took effect over 3 decades ago. In addition, the reasonably attributable visibility impairment p rovisions have received few amendments over the years, including during amendments made by the Regional Haze Rule in 1999 where the changes to integrate the reasonably attributable vi sibility impairment assessment and mitigation provisions with the new regional haze program requi rements were limited to putting the two separately designed programs on the same recurring schedule. This has left a substantial amount of confusing and outdated language within the curre nt visibility regulations including seemingly overlapping and redundant requirements, particularl y between §§51.302 and 51.306. Also, as noted in section III.A, in actual practice the port ion of the reasonably attributable visibility***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 78 of 142 impairment provisions mandating periodic assessment of reasonably attributable visibility impairment by states (or by the EPA in the case of states that do not have an approved reasonably attributable visibility impairment SIP) has not resulted in any additional emission control requirements being placed on emission sourc es. While there have historically been very few certifications of existing reasonably attributa ble visibility impairment by an FLM, in several situations a certification by an FLM has ultimately resulted in new controls or changes in source operation. The EPA therefore believes it is time to bring clar ity to the reasonably attributable visibility impairment provisions of the rule and en hance the potential for environmental protection. In brief, our proposed changes would (1 ) eliminate recurring requirements on states that we believe have no significant benefit for vis ibility protection; 46 (2) clarify and strengthen the existing provisions under which states must add ress reasonably attributable visibility impairment when an FLM certifies that such impairme nt is occurring in a particular Class I area due to a single source or a small number of sources ; (3) remove existing FIP provisions that require the EPA to periodically assess whether reas onably attributable visibility impairment is occurring and to respond to FLM certifications; and (4) edit various portions of §§51.300-308 to make them clearer and more compatible with each oth er. The substantive and clarifying changes are described in the following discussion in order of section number. The EPA seeks comment on each of the following proposed changes, as well as suggestions for alternative approaches to modernizing the reasonably attributable visibility impairment provisions.

46 These changes, when finalized, would mean that tho se states with SIPs that commit them to periodically assess whether reasonably attributable visibility impairment is occurring at their Class I areas could remove that commitment from the ir SIPs.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 79 of 142 The EPA is proposing to amend §51.300, Purpose and applicability, to expand the reasonably attributable visibility impairment requi rements to all states and territories, with the exceptions of Guam, Puerto Rico, American Samoa, an d the Northern Mariana Islands. These territories have no mandatory Class I areas and are sufficiently far from other Class I areas to have no anticipated impact on visibility in such ar eas. Under our proposal, the geographic coverage of the reasonably attributable visibility impairment provisions and the regional haze provisions would be the same. The EPA believes thes e changes would strengthen the visibility program and are appropriate in light of the evolved understanding that pollutants emitted from one or a small number of sources can affect Class I areas many miles away. In other words, emissions occurring in states without Class I areas can affect downwind states with Class I areas. This proposed change would provide these areas with additional protection from reasonably attributable visibility impairment. The EPA is proposing to amend §51.301, Definitions, to change the definition of reasonably attributable. The current definition of reasonably attributable is “ attributable by visual observation or any other technique the State deems appropriate.” We are proposing to modify this definition to read “attributable by vis ual observation or any other appropriate technique.” This change would remove the current im plication that only a state can determine what techniques are appropriate, even though the FL Ms are charged with certifying reasonably attributable visibility impairment. The proposed ch ange would make it clear that a state does not have complete discretion to determine what techniqu es are appropriate for attributing visibility impairment to specific sources. It is appropriate t hat the EPA be able to review the technique(s) that an FLM has relied upon to determine that reaso nably attributable visibility impairment is occurring, in light of the views and supporting inf ormation provided by both the FLM and the***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 80 of 142 state. While these views and supporting information , regardless of whether provided by the FLM or by the state, will not be presumptive in EPA’s u ltimate determination as to whether any attribution technique used was appropriate, the uni verse of potentially appropriate attribution techniques is not limited to only those techniques that may have been utilized during past reasonably attributable visibility impairment certi fications or that have been previously recommended or discussed via EPA guidance or action s. Rather, the aforementioned advances in ambient monitoring, emissions quantification, emiss ion control technology and meteorological and air quality modeling that have occurred in the decades since 1980 make clear that modeling is one possible technique for determining that reas onably attributable visibility impairment is occurring. Due to the confusing, and in large part outdated, content of §51.302, the EPA is proposing to delete the entire text of this section and replace it with new language. The new text clearly describes a state’s responsibilities upon r eceiving a FLM certification of reasonably attributable visibility impairment. The proposed §51.302(a) involves FLM certification of reasonably attributable visibility impairment and reads much like the existing §51.302 (c), with the added language that FLMs would identify in the certification which single so urce or small number of sources is responsible***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 81 of 142 for the reasonably attributable visibility impairme nt being certified. 47 Further, the original reasonably attributable visibility impairment formu lation did not anticipate a situation where one or a small number of sources in one state could cre ate impairment of visibility in other state(s). Therefore, proposed language is included to explain that the FLMs would provide the certification to the state in which the source or s mall number of sources is located, which may not necessarily be the state where the visibility i mpairment occurs. The proposed language also addresses the possible situation that a “small numb er of sources” may be partially in one state and partially in another, such that a certification might be addressed to multiple states. The proposed §51.302(b) describes the required sta te action in response to any FLM reasonably attributable visibility impairment certi fication, i.e., regardless of the type of source, namely that a state shall revise its regional haze implementation plan to include a determination, based on the four reasonable progress factors set f orth in §51.308(d)(1)(i)(A), of any controls necessary on the certified source(s) to make reason able progress toward natural visibility conditions in the affected Class I area. This prese rves the current state obligation with much the same wording as in the current section, including t he fact that a certification by an FLM would not create a definite state obligation to adopt a n ew control requirement, but rather only to submit a SIP revision that provides for any controls neces sary for reasonable progress . In some cases, this SIP revision could be combined with an already required SIP revision. The EPA would

47 The existing rule text at §51.302(c)(1) does not e xplicitly require the FLM to identify a particular source or small number of sources as res ponsible for the reasonably attributable impairment, but the EPA and the FLMs understand tha t such identification should be part of a certification. See 45 FR 80086, “The Federal Land M anager may provide the State with a list of sources suspected of causing or contributing to vis ibility impairment in the mandatory Class I Federal area.” Under the proposed new language of § 51.302(b), if the FLM does not identify the source or small number of sources causing the impai rment, the certification would not create any obligation on the state to respond with a SIP revis ion.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 82 of 142 review the responding SIP, and would be available t o consult with the state and the certifying FLM as the state prepares its responding SIP. It wo uld be the EPA, not the certifying FLM, that would determine whether the responding SIP is adequ ate and the response reasonable. The proposed section further maintains the current requ irement that the state include emissions limitations and schedules for compliance, and adds the requirement that SIPs include monitoring, recordkeeping and reporting requirements in order t o enforce those emissions limitations. The proposed §51.302(c) addresses those situations where an FLM certifies as a reasonably attributable visibility impairment sourc e a BART-eligible source where there is at that time no SIP or FIP in place setting BART emiss ion limits for that source or addressing BART requirements via a better-than-BART alternativ e program. 48 In such an instance, the proposed rule requires the state to revise its regi onal haze SIP to meet the requirements of §51.308(e), BART requirements for regional haze vis ibility impairment, and notes that this requirement exists in addition to the requirements of §51.302(b) regarding imposition of controls for reasonable progress. The new version of §51.302 (c) clarifies two aspects of the current rule to match the EPA’s past and current interpretations . First, a reasonably attributable visibility impairment certification for a BART-eligible source prior to the EPA’s approval of a state’s BART SIP for that source does not impose any substa ntive obligation on a state that is over and above the BART obligation imposed by §51.308. Howev er, the state’s response to the reasonably attributable visibility impairment certification of a BART-eligible source must take into account current information. This may require a state to up date an analysis prepared earlier in support of

48 Although most of the BART requirements have been a ddressed in most states, there remain a handful of states with BART obligations. In additio n, there is litigation over the BART element in some approved SIPs and promulgated FIPs. We expe ct that this situation may exist in one or more states at some time after the effective date o f the final rule.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 83 of 142 a BART SIP that has not been approved. Second, a re asonably attributable visibility impairment certification of a BART-eligible source after the s tate’s BART SIP for that source has been approved by the EPA does not trigger a requirement for a new BART determination based on the five statutory factors for BART. Rather, the state’ s obligation with respect to that source is the same as for a non-BART eligible source, as stated i n the paragraph immediately earlier. This is true regardless of how the state’s SIP has addresse d the BART requirement for the source, whether through source-specific emission limits, an alternative better-than-BART analysis, or the special provisions of §51.309, which may have not r esulted in any new emission limit for the

source. Regarding the time schedule for state response to an FLM certification of reasonably attributable visibility impairment, we are consider ing a number of possible approaches for the final rule, but proposed rule text is provided only for the most complicated of these approaches. This approach will be explained first. The proposed rule text at §51.302(d) provides for different deadlines for the state response to the certification depending on when in the cycle of periodic comprehensive SIP revisions the reasonably attributable visibility im pairment certification is made. Table 2 provides specific examples of how application of the approac h in the proposed rule text would determine due dates for the state response to a certification

.

• If the certification is made more than 2 years prio r to the due date for any periodic comprehensive regional haze SIP revision required u nder § 51.308(f) (but, with respect to the SIP due for the just-prior period, not so early as to be within the 6-month window described next), then a state must respond to the c ertification in that upcoming SIP revision. Failure to respond adequately would preve nt full approval of that SIP revision.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 84 of 142 If the certification is made more than 2 years befo re the SIP due date, the state would have more than 2 years to respond, except as provid ed in the next bullet. 49

• If the certification is made less than 2 years prio r to the due date for any periodic comprehensive SIP revision (but no more than 6 mont hs subsequent to the submission date of that periodic comprehensive regional haze S IP revision or a SIP revision that amends a previous submission in a way that affects the emission limits applicable to the reasonably attributable visibility impairment-certi fied source 50 ), then the state must submit a revision to its regional haze SIP within 2 years from the date of certification. The EPA believes that in this second timing situati on, when the state’s analytical infrastructure has been recently used to prepare a SIP revision and thus would not be in need of much if any refreshment, it is appropriate to require a responding SIP revision without waiting longer than 2 years for the next pe riodic comprehensive SIP revision. In this timing situation, the EPA would act on the sta te’s standard regional haze SIP without regard to the not-yet-due obligation for a reasonab ly attributable visibility impairmentresponse SIP revision. Table 2: Example FLM Reasonably Attributable Visibi lity Impairment Certification Dates and Corresponding Due Dates for State Response. All assume submission of a SIP revision by July 31, 2021, unless otherwise noted.

Date of FLM certification Proposed due date for sta te response July 30, 2019 July 31, 2021 August 1, 2019 August 1, 2021

49 For a certification made between the 2021 and 2028 SIP due dates, the state might have up to 6.5 years to respond, assuming the next bullet does not apply. For a certification made between the 2028 and 2038 due dates, the state might have u p to 9.5 years to respond. 50 If a certification is made not too long after a SI P due date, this parenthetical provision would operate to require the SIP revision needed to respo nd to the reasonably attributable visibility impairment certification to be due sooner than the 6.5 or 9.5 year extreme noted in the previous footnote.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 85 of 142 January 30, 2022 January 30, 2024 February 1, 2022 July 31, 2028 April 1, 2022, after late submission of a SIP

on March 1, 2022 April 1, 2024 August 31, 2022, after revised SIP submission on July 31, 2021, affecting the source identified in the reasonably attributable visibility impairment

certification August 31, 2024

These timing provisions can be viewed as a compromi se between possibly requiring more than one major planning activity during each (appro ximately) 10-year SIP cycle and obtaining the benefit of additional emission controls via a r esponse to an FLM certification of reasonably attributable visibility impairment within a reasona ble time period. These provisions in the proposed rule text also reflect the fact that an FL M may, in rare cases, wish to certify a reasonably attributable visibility impairment sourc e after reviewing (and having disagreements with) a SIP that a state has recently submitted to the EPA. The EPA invites comment on this timing approach sho wn in Table 2 and the proposed rule text, but also on other, simpler approaches that w ould strike a compromise that leans more towards obtaining additional visibility improvement s sooner following a FLM certification of reasonably attributable impairment at a Class I are a. In particular, the EPA invites comment on (1) retaining the existing requirement for a state to respond to a reasonably attributable visibility impairment certification with a SIP revison within 3 years regardless of when the certification is made in the cycle of periodic comprehensive SIP rev isions and (2) requiring the state’s responsive SIP revision to be submitted on the the due date of the next progress report (but not as part of the progress report, if the final rule does not require progress reports themselves to be submitted as SIP revisions) or the next periodic co mprehensive SIP revision whichever is earlier***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 86 of 142 provided the earlier date is at least 2 years after the RAVI certification. The final rule may incorporate any one of these three proposals, or ma y combine features of these proposals. It is important to note that regardless how the fin al rule sets the deadline for the state’s responsive SIP revision, if the reasonable progress goals in the periodic comprehensive regional haze SIP for a state with a Class I area (and thus required to have reasonable progress goals in its SIP for that area) have been approved prior to the approval of its own or a contributing state’s separate reasonably attributable visibility impairm ent-response SIP, the state would not be required to revisit and revise its reasonable progr ess goals to take into account any additional emission reductions from the certified source until the next due date for a periodic comprehensive SIP revision. Proposed changes to §51.303, Exemptions from contr ol, are minor edits to paragraph (a) designed to correctly refer to the new §51.302(c) a s well as to the BART provisions in §51.308(e). These proposed changes do not alter whi ch existing facilities may apply to the Administrator for an exemption from BART. Rather, t he proposed changes simply make the language more clear and direct the reader to the ap propriate sections for reference information. Proposed changes to §51.304, Identification of int egral vistas, are more extensive. An integral vista is defined in §51.301 as a view perc eived from within the Class I area of a specific landmark or panorama located outside the boundary o f the Class I area. The current version of §51.304 was written at a time when FLMs were still in the process of identifying integral vistas. We are proposing to remove antiquated language in § 51.304 in light of the fact that FLMs were required to identify any such integral vistas on or before December 31, 1985. The proposed language would explain this fact as well as list th ose few integral vistas that were properly identified during the applicable time period. State s would continue to be subject to the***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 87 of 142 requirement that these integral vistas be listed in their SIPs. The EPA notes that the current version of 40 CFR part 51, subpart P is not perfect ly clear on how the existence of an identified integral vista affects obligations on states and so urces, but we are not proposing any clarification as part of this rulemaking. 51 We invite comment on whether all references to int egral vistas should be removed from subpart P, and we may do so in the final rule. Proposed changes to §51.305, Monitoring for reason ably attributable visibility impairment, involve adding language stating that th e requirement for a state to include in a periodic comprehensive SIP revision a monitoring st rategy specifically for evaluating reasonably attributable visibility impairment in Class I area( s) only applies in situations where the Administrator, Regional Administrator or FLM has ad vised the state of a need for it. In concept, special monitoring for reasonably attributable visi bility impairment purposes might be appropriate for a Class I area without an IMPROVE m onitoring station or when the impairment is from a relatively narrow plume such that the exi sting IMPROVE monitoring site is not affected. The nature of the special monitoring migh t be situation-specific, and might be the same as or different than the IMPROVE monitoring protoco ls. These proposed changes would reduce the paperwork that states are required to submit to the EPA on a recurring schedule, since under the proposed language a state containing one or mor e Class I areas and participating in the IMPROVE monitoring program would be relieved of the need to include information in its SIP

51 Section 51.301 states that “ visibility in any mandatory Class I Federal area includes any integral vista associated with that area” but also that “ adverse impact on visibility ” does not include effects on integral vistas. Section 307(b) requires that SIPs provide for the review of any new major stationary source or major modification t hat may have an impact on any integral vista of a mandatory Class I Federal area. Other referenc es to “integral vista” are merely definitional or relate to the procedure for identifying integral vistas.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 88 of 142 regarding monitoring to specifically assess reasona bly attributable visibility impairment absent being advised to do so. A strategy for monitoring f or regional haze visibility impairment under §51.308(d)(4) is still required and any monitoring for reasonably attributable visibility impairment under §51.305 would be in addition to th at requirement. Section 51.306, on long-term strategy requirements for reasonably attributable visibility impairment, is proposed to be completely removed an d reserved. Like the current version of §51.302, the language of this section is out-dated. In this case, the EPA believes it makes sense to delete the entire text of this section and inste ad refer to long-term strategy requirements for reasonably attributable visibility impairment withi n the text of §51.308, specifically in §51.308(f)(2). In this way, long-term strategy requ irements for reasonably attributable visibility impairment would be retained in clearer form, and t he visibility program would be more understandable to states and the public by listing the long-term strategy requirements for both regional haze and reasonably attributable visibilit y impairment in one place. Such a change would also reduce the planning burden on states by making clear in §51.308(f)(2) that a longterm strategy for reasonably attributable visibilit y impairment is not required without an FLM having made a reasonably attributable visibility im pairment certification under §51.302(a). Several proposed changes in §51.308 were discussed in sections IV.A, B, C, D, E and F of this document. We are also proposing changes in §51.308 related to reasonably attributable visibility impairment. The proposed addition of §51 .308(c) (currently a reserved section) explains the relationship between regional haze and reasonably attributable visibility impairment and the state requirements for each, including that a state would not be required to address reasonably attributable visibility impairment unles s triggered to do so by an FLM certification under §51.302(a), and that a state would not be req uired to re-address its monitoring strategy for***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 89 of 142 reasonably attributable visibility impairment unles s advised to perform monitoring as described in the proposed §51.305. The EPA is also proposing changes to the language of §51.308(f)(2) to describe when reasonably attributable visibility impairment must be addressed in the long-term strategy required for regional haze. Finally, proposed chang es to §51.308(f)(6) regarding the monitoring strategy requirements for SIPs would remove referen ces to §51.305 that exist in the corresponding subsection in §51.308(d), namely, sub section (4) (again, regarding monitoring for reasonably attributable visibility impairment). Proposed changes to §51.308(e), BART, relate to a state’s option to enact an emissions trading program or other alternative measure in lie u of source-specific BART. Under the proposed approach, if a source is already covered f or BART by an approved emissions trading program or other alternative measure (or the progra m codified in §51.309), certification of that source by an FLM would not trigger a new BART deter mination. However, certification would still trigger the requirement for a reasonable prog ress analysis. Proposed changes to §51.308(e)(4) are similar in nature and motivated b y the same concerns. Consistent with our proposal to remove the require ment for states to periodically assess reasonably attributable visibility impairment, we a re also proposing to amend many sections of 40 CFR part 52, to remove provisions that establish FIPs that require the EPA to periodically assess whether reasonably attributable visibility i mpairment exists at Class I areas in certain states and to address it if it does, and to respond to any reasonably attributable visibility impairment certification that may be directed to a state that does not have an approved reasonably attributable visibility impairment SIP. These changes include the removal of §§52.26***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 90 of 142 and 52.29, which now contain the statement of the E PA’s obligations, and specific provisions for 30 states to establish that §§52.26 and 52.29 are a pplicable to those states. H. Consistency Revisions Related to Permitting of N ew and Modified Major Sources Proposed changes to §51.307, New Source Review, inv olve a few proposed changes to maintain consistency with other sections of the Reg ional Haze Rule and with the CAA. The first change involves §51.307(b)(1) concerning integral v istas, for which we are proposing deletion of obsolete language regarding the now-expired identif ication period for integral vistas. Instead, the newly proposed addition of a listing of integral vi stas in §51.304(b) will be referenced. In section §51.307(b)(2), the deletion of a reference to speci fic sections of the CAA is proposed in order to remove unnecessary language, as the EPA believes a reference simply to section “107(d)(1)” is sufficient. I. Changes to FLM Consultation Requirements The EPA believes that state consultation with FLMs is a critical part of the creation of quality SIPs. As mentioned earlier, the EPA is prop osing to extend the FLM consultation requirements of §51.308(i)(2) to progress reports t hat are not SIP revisions. In addition, the EPA believes further edits to §51.308(i)(2) are necessa ry because the current requirement for consultation at least 60 days prior to a public hea ring may not occur sufficiently early in the state’s planning process to meaningfully inform the state’s development of the long-term strategy. This proposed rule change would add a req uirement that such consultation occur early enough to allow the state time for full considerati on of FLM input, but no fewer than 60 days prior to a public hearing or other public comment o pportunity. A consultation opportunity that takes place no less than 120 days prior to a public hearing or other public comment opportunity would be deemed to have been “early enough.”***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 91 of 142 J. Extension of Next Regional Haze SIP Deadline fro m 2018 to 2021 The EPA is proposing to amend §51.308(f) to move th e compliance deadline for the submission of the next periodic comprehensive SIP r evisions from July 31, 2018, to July 31, 2021. Under this proposal, states would retain the option of submitting their SIP revisions before July 31, 2021. Regardless of the date on which a st ate chooses to submit its periodic comprehensive SIP revision, the EPA would evaluate that SIP using the same criteria. The EPA is proposing to leave the end date for the second i mplementation period at 2028, regardless of when SIP revisions are submitted. We are proposing this change as a one-time schedule adjustment. Periodic comprehensive SIP revisions fo r the third planning will be due on July 31, 2028, with future periodic comprehensive SIP revisi ons due every ten years thereafter. We are proposing this extension of the due date for periodic comprehensive SIP revisions to allow states to coordinate regional haze plannin g with other regulatory programs, including but not limited to the Mercury and Air Toxics Stand ards, 52 the 2010 one-hour SO 2 NAAQS, 53 the 2012 annual PM 2.5 NAAQS, 54 and the Clean Power Plan. 55 With this one-time extension, states would be able to gather more information on the eff ects of these programs and develop periodic comprehensive SIP revisions that are more integrate d with state planning for these other programs, an advantage that was widely confirmed in our discussions with states. The Regional Haze Rule requires states to address the impacts of other regulatory programs when developing their regional haze SIPs. A number of other regulat ory programs will be taking effect in the

52 77 FR 9304, February 16, 2012. 53 75 FR 35520, June 22, 2010. 54 78 FR 3086, January 15, 2013. 55 80 FR 64,662, October 23, 2015. The compliance dea dlines in the Clean Power Plan have been stayed by the Supreme Court. Order in Pending Case, West Virginia v. EPA , No. 15A773 (Feb. 9, 2016).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 92 of 142 coming years, which presents an excellent opportuni ty for states to coordinate their strategies to address significant sources of emissions. The EPA e xpects this cross-program coordination to lead to better overall policies and enhanced enviro nmental protection. K. Changes to Scheduling of Regional Haze Progress Reports The EPA is proposing to amend the requirements in 4 0 CFR 51.308(g) and (h) regarding the timing of submission of reports evaluating prog ress towards the natural visibility goal. Under the current rule, regional haze progress reports ar e required to be submitted 5 years after submission of periodic comprehensive SIP revisions. Because states submitted these first SIP revisions on dates spread across about a 3-year per iod, many of the due dates for progress reports currently do not fall mid-way between the due dates for periodic comprehensive SIP revisions, as the EPA initially envisioned that they would. Looki ng forward, the current Regional Haze Rule would in many cases require a progress report short ly before or shortly after a periodic comprehensive SIP revision, at which time it could not be expected to have much utility as a mid-course review of environmental progress or much incremental informational value for the public compared to the data contained in that SIP r evision. Complementing the proposed amendments to 40 CFR 51. 308(f) regarding the deadlines for submittal of periodic comprehensive revisions, we propose to amend 40 CFR 51.308 (g) and (h) such that second and subsequent progress report s would be due by January 31, 2025, July 31, 2033, and every 10 years thereafter, placing one pr ogress report mid-way between the due dates for periodic comprehensive SIP revisions. The EPA b elieves that this timing provides a good balance between allowing the implementation of the most recent SIP revision to have proceeded far enough since its adoption for a review to be po ssible and worthwhile and having enough time***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 93 of 142 remaining before the next comprehensive SIP revisio n for state action to make changes in its rules or implementation efforts, if necessary, sepa rately from the actions in that next SIP. Regarding the concept of a progress report also bei ng useful at or near the time of submission of a periodic comprehensive SIP revision , as the EPA envisioned in the 1999 Regional Haze Rule, we note that although they are expressed with somewhat different terminology, in practical terms a progress report w ould provide little additional information beyond that required to be addressed in a periodic comprehensive SIP revision. The only significant additional information required in a pr ogress report but not explicitly required in a periodic comprehensive SIP revision is the requirem ent to report on the trend in visibility over the whole period since the baseline period of 2000- 2004. While the EPA believes that a state should be aware of, and share with the public, info rmation on the trend in visibility over the whole period since the baseline period of 2000-2004 , we believe it would be inefficient to require the preparation of a separate progress repo rt for this purpose. Therefore, we are proposing to limit the requirement for separate pro gress reports to the one due mid-way between periodic comprehensive SIP revisions, and to add to the requirement for periodic comprehensive SIP revisions a requirement to include this trend i nformation. The EPA believes this approach would substantially reduce administrative burdens a nd make progress reports of more informational use to the public, with no attendant reduction in environmental protection. The EPA solicits comment on this and any alternative ap proaches to progress report scheduling. L. Changes to the Requirement that Regional Haze Pr ogress Reports be SIP Revisions The EPA is proposing to amend 40 CFR 51.308(g) rega rding the requirements for the form of progress reports. Under the current regulat ions, progress reports must take the form of SIP revisions that comply with the procedural requi rements of 40 CFR 51.102, 40 CFR 51.103***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 94 of 142 and Appendix V to Part 51 – Criteria for Determinin g the Completeness of Plan Submissions. The EPA included the requirements for progress repo rts in the Regional Haze Rule primarily with an emphasis toward ensuring that the states re main on track during the 10 years between periodic comprehensive SIP revisions. By requiring progress reports to be in the form of SIP revisions, the 1999 Regional Haze Rule ensured an o pportunity for public input on the progress reports, while specifically pointing out that the E PA “intends for progress reports to involve significantly less effort than a comprehensive SIP revision.” 64 FR 35747 (July 1, 1999). For all SIP revisions, however, the state must provide publ ic notice and a public hearing if requested, and it must conform to certain administrative proce dural requirements and provide various administrative material. Also, the submission must be made by an official who is authorized by state law to submit a SIP revision. As a required S IP revision, a finding by the EPA that a state has not submitted a complete progress report by the deadline would start a “clock” for the EPA to prepare, take public comment on, and issue a pro gress report like the state was required to submit. We are proposing that progress reports need not be in the form of SIP revisions, but that states must consult with FLMs and obtain public com ment on their progress reports before submission to the EPA. We are also proposing that t he SIP revision that would be due in 2021 must include a commitment to prepare and submit the se progress reports to the EPA according to the proposed revised schedule ( see previous section). These progress reports would be acknowledged and assessed by the EPA, but our revie w of these reports would not result in a formal approval or disapproval of them. The EPA is proposing these changes because it belie ves these reports are not the kind of state submissions for which the formality of a SIP revision, and the accompanying requirement***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 95 of 142 for the EPA to have to prepare the report within 2 years of finding that a state has failed to do so, are warranted. It is important to note that as part of the EPA’s review of the report, we will follow up with the state on any appropriate next st eps. There are also additional remedies, such as undertaking a less formal assessment of the resu lts of the implementation of the previously submitted SIP, that are available to the EPA in the event a state fails to properly submit a progress report. These changes have been widely sup ported by state air agencies in our preproposal consultations because they would allow mor e efficient use of state resources. This option would relieve states of the obligation to fo llow the procedural requirements of 40 CFR 51.102 and 51.103. States have expressed concern th at these procedural requirements are resource-intensive, and increase the burden on stat es by requiring formal procedures be followed when submitting progress reports. By avoiding the s pecific formal steps required for a SIP revision, including requirements imposed by state l aw that may involve time-consuming steps beyond those required by the EPA, this proposal may also reduce the time between the completion of the technical analysis in the progres s report and when the final report becomes available to the EPA and the public. Thus, progress reports could contain fresher information on the environmental progress being made by a state. R emoving the requirement that progress reports be submitted as SIP revisions is consistent with regulatory requirements for similar reports from states for progress reporting or plann ing purposes where control requirements are not imposed, such as annual monitoring plans requir ed for planning and maintenance of state monitoring networks. 56

56 See 40 CFR 58.10(a)(1) and (a)(2).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 96 of 142 The EPA invites comment on whether it should finali ze this proposed change. Also, the EPA invites comment on changing the progress report scheduling as described in the previous section without making any change to the requiremen t that progress reports take the form of SIP revisions, and vice versa. It is important to note that under this option, sta tes would still be required to include the required progress report elements listed in 40 CFR 51.308(g)(1) through (g)(6). Also, §51.308(h) would continue to require that at the same time the state is required to submit a progress report, it must also take one of four listed actions concernin g whether the SIP is adequate to achieve established goals for visibility improvement. Where a state determines that its own SIP is or may be inadequate to ensure reasonable progress due to emissions from sources within the state, the state will continue to have an obligation to revise its SIP to address the plan’s deficiencies within 1 year of its submission of such a determination. Upon receipt of such progress reports, the EPA woul d review the reports. In addition, the EPA intends to create a system of logging progress reports as they are received, and making them available to the public. In addition to puttin g the public on notice that a progress report was received by the EPA, this system would provide the public an opportunity to view the contents of the progress report. Although the EPA would not for mally approve or disapprove a progress report, the EPA would still have discretion to asse ss the adequacy of the SIP, relying in part on the information in the progress report. Under the C AA, a discretionary determination that the SIP is inadequate would create a non-discretionary duty for the EPA to issue a SIP call requiring the state to correct the inadequacy. A failure by the s tate to submit a progress report could be determined by the EPA to constitute failure to impl ement the regional haze SIP, given that we***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 97 of 142 are proposing that every regional haze SIP include a commitment to submit the required progress reports ( see next paragraph). We are proposing that the next periodic comprehensi ve SIP revisions (currently due in 2018 but proposed to be due in 2021) would need to include a commitment for states to provide progress reports. The 1999 Regional Haze Rule does not require such a commitment because the current requirement for progress reports to be subm itted in the form of SIP revisions makes such a commitment superfluous. The EPA solicits comment on this or alternative approaches to ensuring that states continue to provide progress r eports. M. Changes to Requirements Related to the Grand Can yon Visibility Transport Commission Section 51.309 has limited applicability going for ward because its provisions apply only to 16 Class I areas covered by the Grand Canyon Vis ibility Transport Commission Report, and only to the first regional haze implementation peri od (i.e., through 2018). Nevertheless, certain conforming amendments at this time are appropriate to avoid confusion going forward. Section 51.309(d)(4)(v) is proposed to be amended to correc tly refer to the new §51.302(b) (in lieu of (e), which no longer exists in the proposed section §51.302) and to delete the reference to BART since it does not appear in §51.302(b). The title o f §51.309(c)(10), Periodic implementation plan revisions, is proposed to be amended to include “an d progress reports” at the end. This insertion would complement the proposed amendments that will no longer require progress reports be considered SIP revisions by making clear from the t itle of the section that it applies to both SIP revisions and progress reports. Within §51.309(c)(1 0), amendments are proposed that would preserve the existing requirement that the progress reports due in 2013 were to take the form of SIP revisions, but direct the reader to the provisi ons of §51.308(g) for subsequent progress reports. In similar fashion, §51.309(c)(10)(i) and (ii) would be amended to specifically refer to***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 98 of 142 the 2013 progress reports, while §51.309(c)(10)(iii ) would point to §51.308(g) for subsequent progress reports. Section 51.309(c)(10)(iv) is prop osed to be added to indicate that subsequent progress reports are subject to the requirements of §51.308(h) regarding determinations of adequacy of existing SIPs. A final change in section 51.309 appears in §51.30 9(g)(2)(iii). This change is purely to correct a typographical error and the EPA will ther efore not consider comments on this subsection. V. Environmental Justice Considerations The EPA believes this action would not have disprop ortionately high and adverse human health, well-being or environmental effects on mino rity, low-income or indigenous populations because it would not negatively affect the level ofprotection provided to human health, wellbeing or the environment under the CAA’s visibility protection program. When promulgated, these proposed regulations will revise procedural a nd timing aspects of the SIP requirements for visibility protection but will not substantively ch ange the requirement that SIPs provide for reasonable progress towards the goal of natural vis ibility conditions. These SIP requirements are designed to protect all segments of the general pop ulation. The EPA acknowledges that the proposed delay in sub mitting SIP revisions from 2018 to 2021 might cause delays in when sources must comply with any new requirements. However, because neither the CAA nor the existing Regional H aze Rule set specific deadlines for when sources must comply with any new requirements in a state’s next periodic comprehensive SIP revision, states have substantial discretion in est ablishing reasonable compliance deadlines for measures in their SIPs. Given this, we expect to se e a range of compliance deadlines in the next round of regional haze SIPs from early in the secon d implementation period to 2028, depending***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 99 of 142 on the types of measures adopted, whether or not th ese proposed rule changes are finalized. Thus, the EPA believes the delay in the periodic co mprehensive SIP revision submission deadline from 2018 to 2021 will not meaningfully re duce the overall progress towards better visibility made by the end of 2028 and will not mea ningfully adversely affect environmental protection for all general segments of the populati on. VI. Statutory and Executive Order Reviews
A. Executive Order 12866: Regulatory Planning and Revi ew and Executive Order 13563: Improving Regulation and Regulatory Review This action is a significant regulatory action that was submitted to the OMB for review because it raises novel policy issues. Any changes made in response to OMB recommendations have been documented in the docket. B. Paperwork Reduction Act (PRA) The information collection activities in this prop osed rule have been submitted for approval to the OMB under the PRA. The Information Collection Request (ICR) document that the EPA prepared has been assigned the EPA ICR numb er 1813.10, OMB Control No. 2060- 0421. You can find a copy of the ICR in the docket for this rule, and it is briefly summarized here. The EPA is proposing these amendments to requireme nts for state regional haze planning to change the requirements that must be met by stat es in developing regional haze SIPs, periodic comprehensive SIP revisions, and progress reports f or regional haze. The main intended effects of this rulemaking are to provide states with addit ional time to submit regional haze plans for the second implementation period and to provide states with an improved schedule and process for progress report submission. Further reductions in b urden on states include this proposal’s***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 100 of 142 removal of the requirement for progress reports to be SIP revisions, clarifying that states are not required to project emissions inventories as part o f preparing a progress report, and relieving the state of the need to review its visibility monitori ng strategy within the context of the progress report. With all of these proposed changes consider ed, the overall burden on states would represent a reduction compared to what would otherw ise occur if the provisions of the current rule were to stay in place. Total estimated burden is estimated to be reduced from 10,307 hours (per year) to 5,974 hours (per year), and total est imated cost is expected to be reduced from $510,498 (per year) to $295,876 (per year). All sta tes are required to submit regional haze SIPs and progress reports under this rule. Respondents/affected entities: All state air agencies . Respondent’s obligation to respond: Mandatory, in accordance with the provisions of th e 1999 Regional Haze Rule. Estimated number of respondents: 52: 50 states, District of Columbia and U.S. Virgi n Islands. Frequency of response: Approximately every 10 years (SIP) and approximate ly every 10 years (progress report).

Total estimated burden: 5,974 hours (per year). Burden is defined at 5 CFR 1320.3(b).

Total estimated cost: $295,876 (per year), includes $0 annualized capital or operation & maintenance costs. An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a curr ently valid OMB control number. The OMB control numbers for the EPA's regulations in 40 CFR are listed in 40 CFR part 9.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 101 of 142 Submit your comments on the agency’s need for this information, the accuracy of the provided burden estimates and any suggested methods for minimizing respondent burden to the EPA using the docket identified at the beginning ofthis rule. You may also send your ICRrelated comments to OMB’s Office of Information and Regulatory Affairs via email to oira_submissions@omb.eop.gov , Attention: Desk Officer for the EPA. Since OMB is required to make a decision concerning the ICR between 30 and 6 0 days after receipt, OMB must receive comments no later than [INSERT DATE 30 DAYS AFTER PUBLICATION IN THE FEDERAL REGISTER] . The EPA will respond to any ICR-related comments in the final rule. C. Regulatory Flexibility Act (RFA) I certify that this action will not have a signific ant economic impact on a substantial number of small entities under the RFA. This action will not impose any requirements on small entities. Entities potentially affected directly by this proposal include state governments, and for the purposes of the RFA, state governments are not considered small government. Tribes may choose to follow the provisions of the Regional Haz e Rule but are not required to do so. Other types of small entities are not directly subject to the requirements of this rule. The EPA continues to be interested in the potential impacts of the pr oposed rule on small entities and welcomes comments on issues related to such impacts. D. Unfunded Mandates Reform Act (UMRA) This action does not contain any unfunded mandate a s described in UMRA, 2 U.S.C. 1531-1538, and does not significantly or uniquely a ffect small governments. This action imposes no enforceable duty on any state, local or tribal g overnments or the private sector. The CAA imposes the obligation for states to submit regiona l haze SIPs. In this rule, the EPA is proposing to revise those requirements in a manner that would not increase the obligation of any state, local***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 102 of 142 or tribal governments or the private sector. In thi s rule, the EPA is also proposing to extend the reasonably attributable visibility impairment certi fication provisions to some additional states, but these states are not small governments and any mandate on the private sector would be indirect since this rule does not mandate how an af fected state should address such a certification. Therefore, this action is not subjec t to the requirements of sections 202, 203 and 205 of the UMRA. E. Executive Order 13132: Federalism This 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 amon g the various levels of government. The requirement to submit regional haze SIPs is mandate d by the CAA. Thus, Executive Order 13132 does not apply to these proposed regulations. In the spirit of Executive Order 13132 and consiste nt with the EPA policy to promote communications between the EPA and state and local governments, the EPA has already consulted extensively with state air agency officia ls prior to this proposal. The EPA specifically solicits comments on this proposed action from stat e and local officials. In addition, the EPA intends to meet with organizations representing sta te and local officials during the comment period for this action. F. Executive Order 13175: Consultation and Coordina tion with Indian Tribal Governments This proposed action does not have tribal implicati ons as specified in Executive Order 13175. It would not have a substantial direct effec t on one or more Indian tribes. Furthermore, these proposed regulation revisions do not affect t he relationship or distribution of power and responsibilities between the federal government and Indian tribes. The CAA and the TAR***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 103 of 142 establish the relationship of the federal governmen t and tribes in characterizing air quality and developing plans to protect visibility in Class I a reas. Thus, Executive Order 13175 does not apply to this action. Although Executive Order 13175 does not apply to th is action, the EPA solicits comment on this proposed action from tribal officials. The EPA also intends to offer to consult with any tribal government to discuss this proposal. See also section III.B.5 for further discussion regarding the role of tribes in visibility protecti on. G. Executive Order 13045: Protection of Children fr om Environmental Health and Safety Risks The EPA interprets Executive Order 13045 as applyin g only to those regulatory actions that concern environmental health or safety risks t hat the EPA has reason to believe may disproportionately affect children, per the definit ion of “covered regulatory action” in section 2- 202 of the Executive Order. This action is not subj ect to Executive Order 13045 because it does not concern an environmental health risk or safety risk. H. Executive Order 13211: Actions Concerning Regula tions That Significantly Affect Energy Supply, Distribution or Use This action is not a “significant energy action” be cause it is not likely to have a significant adverse effect on the supply, distribut ion or use of energy. I. National Technology Transfer and Advancement Act This rulemaking does not involve technical standard s. J. Executive Order 12898: Federal Actions to Addres s Environmental Justice in Minority Populations and Low-Income Populations The EPA believes the human health or environmental risk addressed by this action will not have disproportionately high and adverse human health or environmental effects on minority,***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 104 of 142 low-income or indigenous populations. The results o f our evaluation are contained in section V of this document. VII. Statutory Authority The statutory authority for this action is provide d by 42 U.S.C. 7403, 7407, 7410 and 7601.

Page 85 of 120 - Protection of Visibility: Amendmen ts to Requirements for State Plans
List of Subjects 40 CFR Part 51 Environmental protection, Administrative practice a nd procedure, Air pollution control, Nitrogen dioxide, Particulate matter, Sulfur oxides, Transpo rtation, Volatile organic compounds. 40 CFR Part 52 Environmental protection, Administrative practice a nd procedure, Air pollution control, Incorporation by reference, Nitrogen dioxide, Parti culate matter, Sulfur oxides, Transportation, Volatile organic compounds.

__________________________________ Dated:***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 105 of 142 __________________________________ Gina McCarthy, Administrator.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 106 of 142 For the reasons stated in the preamble, Title 40, C hapter I of the Code of Federal Regulations is proposed to be amended as follows:

PART 51–-REQUIREMENTS FOR PREPARATION, ADOPTION, AN D 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 §51.300, revise paragraph (b) to read as foll ows: §51.300 Purpose and applicability.

* * * * * (b) Applicability —The provisions of this subpart are applicable to a ll States as defined in section 302(d) of the Clean Air Act (CAA) except Guam, Puer to Rico, American Samoa, and the Northern Mariana Islands.

* * * * * 3. In §51.301: a. Add definitions for “Clearest days,” “Deciview i ndex,” “End of the applicable implementation period,” “Natural visibility conditions,” “Prescrib ed fire,” “Smoke management program,” “Visibility,” “Wildfire,” and “Wildland.”***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 107 of 142 b. Revise the definitions for “Deciview,” “Federal Class I area,” “Least impaired days,” “Mandatory Class I Federal Area,” “Most impaired da ys,” “Reasonably attributable,” and “Visibility impairment.”

The revisions and additions read as follows: §51.301 Definitions.

* * * * * Clearest days means the twenty percent of monitored days in a ca lendar year with the lowest values of the deciview index.

Deciview is the unit of measurement on the deciview index s cale for quantifying in a standard manner human perceptions of visibility.
Deciview index

means a value for a day that is derived from calcu lated or measured light extinction, such that uniform increments of the ind ex correspond to uniform incremental changes in perception across the entire range of conditions , from pristine to very obscured. The deciview index is calculated based on the following equation (for the purposes of calculating deciview using IMPROVE data, the atmospheric light extinctio n coefficient must be calculated from aerosol measurements and an estimate of Rayleigh sc attering): Deciview index=10 ln (b ext /10 Mm −1 ).

b ext =the atmospheric light extinction coefficient, expr essed in inverse megameters (Mm−1). End of the applicable implementation period means December 31 of the year in which the next periodic comprehensive implementation plan revision is due under §51.308(f).

* * * * ****E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 108 of 142 Federal Class I area or Class I Federal area means any Federal land that is classified or reclassified Class I. Mandatory Federal Class I are as are identified in part 81, subpart D. Other Federal Class I areas are identified in part 52 of this title.

* * * * * Least impaired days means the twenty percent of monitored days in a ca lendar year with the lowest amounts of visibility impairment.

* * * * * Mandatory Class I Federal Area or Mandatory Federal Class I Area means any area identified in part 81, subpart D of this title. Most impaired days means the twenty percent of monitored days in a ca lendar year with the highest amounts of visibility impairment.

* * * * * Natural visibility conditions means visibility ( contrast, coloration, and textu re) that would have existed under natural conditions. Natural visibilit y conditions vary with time and location, and are estimated or inferred rather than directly meas ured.

* * * * * Prescribed fire means any fire intentionally ignited by management actions in accordance with applicable laws, policies, and regulations to meet specific land or resource management objectives.

* * * * ****E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 109 of 142 Reasonably attributable means attributable by visual observation or any ot her appropriate technique.

* * * * * Smoke management program means a framework to minimize the impact of smoke f rom prescribed agricultural and/or wildland management burning operations that includes enforceable restrictions on prescribed fire.

* * * * * Visibility means the degree of perceived clarity when viewing objects at a distance. Visibility includes perceived changes incontrast, coloration, and texture of elements in a scene. Visibility impairment

means any humanly perceptible difference between a ctual visibility conditions and natural visibility conditions. Becau se natural visibility conditions can only be estimated or inferred, visibility impairment also i s estimated or inferred rather than directly measured.

* * * * * Wildfire means any fire started by an unplanned ignition ca used by lightning; volcanoes; other acts of nature; unauthorized activity; or accidenta l, human-caused actions, or a prescribed fire that has been declared to be a wildfire. A wildfire that predominantly occurs on wildland is a natural event.
Wildland means an area in which human activity and developm ent is essentially non-existent, except for roads, railroads, power lines, and simil ar transportation facilities. Structures, if any, are widely scattered.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 110 of 142 * * * * * 4. In §51.302: a. Revise the section heading. b. Revise paragraphs (a), (b), and (c). c. Add paragraph (d).

The revisions and addition read as follows: §51.302 Reasonably attributable visibility impairme nt. (a) The affected Federal Land Manager may certify, at any time, that there exists reasonably attributable impairment of visibility in any mandat ory Class I Federal area and identify which single source or small number of sources is respons ible for such impairment. The affected Federal Land Manager will provide the certification to the State in which the impairment occurs and the State(s) in which the source(s) is located. (b) The State(s) shall revise its regional haze imp lementation plan, in accordance with the schedules set forth in paragraphs (d)(1) and (d)(2) of this section, to include for each source or small number of sources that the Federal Land Manag er has identified in whole or in part for reasonably attributable visibility impairment as pa rt of a certification under paragraph (a) of this section: (1) A determination, based on the factors set forth in §51.308(d)(1)(i)(A), of the control measures, if any, that are necessary with respect t o the source or sources in order for the plan to make reasonable progress toward natural visibility conditions in the affected Class I Federal

area;***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 111 of 142 (2) Emission limitations that reflect the degree of emission reduction achievable by such control measures and schedules for compliance as expeditiou sly as practicable; and (3) Monitoring, recordkeeping, and reporting requir ements sufficient to ensure the enforceability of the emission limitations. (c) If a source that the Federal Land Manager has i dentified as responsible in whole or in part for reasonably attributable visibility impairment as pa rt of a certification under paragraph (a) of this section is a BART-eligible source, and if there is not in effect as of the date of the certification a fully or conditionally approved implementation plan addressing the BART requirement for that source (which existing plan may incorporate either source-specific emission limitations reflecting the emission control performance of BAR T, an alternative program to address the BART requirement under §51.308(e)(2), (3), and (4), or for sources of SO 2 a program approved under paragraph §51.309(d)(4)), then the State shal l revise its regional haze implementation plan to meet the requirements of §51.308(e) with respect to that source, taking into account current conditions related to the factors listed in §51.308 (e)(1)(ii)(A). This requirement is in addition to the requirement of paragraph (b) of this section. (d)(1) For any existing reasonably attributable vis ibility impairment the Federal Land Manager certifies to the State(s) under paragraph (a) of th is section more than 2 years prior to the due date for a regional haze implementation plan revision re quired under §51.308(f), the State(s) shall include the elements described in paragraphs (b) an d (c) in such revision and such elements shall be considered a required part of such revision. (2) For any existing reasonably attributable visibi lity impairment the Federal Land Manager certifies to the State(s) under paragraph (a) of th is section less than 2 years prior to the due date***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 112 of 142 for a regional haze implementation plan revision re quired under §51.308(f), but no more than 6 months subsequent to the submission date of that im plementation plan revision or no more than 6 months subsequent to a further plan revision that c hanges the emission limitation for the subject source, the State(s) shall submit a revision to its regional haze implementation plan that includes the elements described in paragraph (b) and (c) no later than 2 years after the date of the certification. The State(s) is not required at that time to also revise its reasonable progress goals to reflect the additional emission reductions requi red from the source or sources. 5. In §51.304: a. Revise paragraphs (a), (b), and (c). b. Remove and reserve paragraph (d).

The revisions read as follows: §51.304 Identification of integral vistas. (a) Federal Land Managers were required to identify any integral vistas on or before December 31, 1985, according to criteria the Federal Land Ma nagers developed. These criteria must have included, but were not limited to, whether the inte gral vista was important to the visitor's visual experience of the mandatory Class I Federal area. (b) The following integral vistas were identified b y Federal Land Managers: at Roosevelt Campobello International Park, from the observation point of Roosevelt cottage and beach area, the viewing angle from 244 to 256 degrees; and at R oosevelt Campobello International Park, from the observation point of Friar’s Head, the vie wing angle from 154 to 194 degrees.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 113 of 142 (c) The State must list in its implementation plan any integral vista listed in paragraph (b) of this section. (d) [Reserved]
6. Section 51.305 is revised to read as follows: §51.305 Monitoring for reasonably attributable visi bility impairment. For the purposes of addressing reasonably attributa ble visibility impairment, if the Administrator, Regional Administrator, or the affec ted Federal Land Manager has advised a State containing a mandatory Class I Federal area o f a need for monitoring to assess reasonably attributable visibility impairment at a mandatory C lass I Federal area in addition to the monitoring currently being conducted to meet the re quirements of §51.308(d)(4), the State must include in the next implementation plan revision to meet the requirement of §51.308(f) an appropriate strategy for evaluating reasonably attr ibutable visibility impairment in the mandatory Class I Federal area by visual observation or other appropriate monitoring techniques. Such strategy must take into account current and anticip ated visibility monitoring research, the availability of appropriate monitoring techniques, and such guidance as is provided by the Agency.
7. Section 51.306 is removed and reserved. §51.306 [Removed and Reserved] 8. In §51.307, revise paragraphs (a) introductory t ext and (b) to read as follows: §51.307 New source review.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 114 of 142 (a) For purposes of new source review of any new ma jor stationary source or major modification that would be constructed in an area that is design ated attainment or unclassified under section 107(d) of the CAA, the State plan must, in any revi ew under §51.166 with respect to visibility protection and analyses, provide for:

* * * * * (b) * * * (1) That may have an impact on any integral vista o f a mandatory Class I Federal area listed in §51.304(b), or (2) That proposes to locate in an area classified a s nonattainment under section 107(d)(1) of the Clean Air Act that may have an impact on visibility in any mandatory Class I Federal area.

* * * * * 9. In §51.308: a. Add paragraphs (c), (f)(4), (f)(5), (f)(6), (g)( 3)(i)(A), (g)(3)(i)(B), (g)(3)(ii)(A), (g)(3)(ii)(B ), (g)(3)(iii)(A), and (g)(3)(iii)(B). b. Revise paragraphs (b), (d)(2)(iv), (d)(3), (e)(2 )(v), (e)(4), (e)(5), (f), (g) introductory text, (g)(3), (g)(4), (g)(5), (g)(6), (h) introductory te xt, (h)(1), (i)(2), (i)(3), and (i)(4). c. Remove paragraphs (d)(2)(iv)(A), (d)(2)(iv)(B), and (g)(7).

The revisions and additions read as follows: §51.308 Regional haze program requirements.

* * * * ****E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 115 of 142 (b) When are the first implementation plans due under t he regional haze program? Except as provided in §51.309(c), each State identified in §5 1.300(b) must submit, for the entire State, an implementation plan for regional haze meeting the r equirements of paragraphs (d) and (e) of this section no later than December 17, 2007. (c) What is the relationship between requirements for r egional haze and requirements for reasonably attributable visibility impairment? A State must address any reasonably attributable visibility impairment certified by a Federal Land M anager under §51.302(a) in its regional haze implementation plan, as required by §51.302(b)-(d). A State must also meet the requirements of §51.305 if the Administrator, Regional Administrato r, or the Federal Land Manager has advised a State under §51.305 of a need for additional moni toring to assess reasonably attributable visibility impairment at a mandatory Class I Federa l area. (d) * * * (2) * * * (iv) For the first implementation plan addressing t he requirements of paragraphs (d) and (e) of this section, the number of deciviews by which base line conditions exceed natural visibility conditions for the most impaired and least impaired days. (3) Long-term strategy for regional haze. Each State listed in §51.300(b) must submit a long

term strategy that addresses regional haze visibili ty impairment for each mandatory Class I Federal area within the State and for each mandator y Class I Federal area located outside the State that may be affected by emissions from the St ate. The long-term strategy must include enforceable emissions limitations, compliance sched ules, and other measures as necessary to achieve the reasonable progress goals established b y States having mandatory Class I Federal***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 116 of 142 areas. In establishing its long-term strategy for r egional haze, the State must meet the following requirements:

* * * * * (e) * * * (2) * * * (v) At the State's option, a provision that the emi ssions trading program or other alternative measure may include a geographic enhancement to the program to address the requirement under §51.302(b) related to reasonably attributable impai rment from the pollutants covered under the emissions trading program or other alternative meas ure.
* * * * * (4) A State subject to a trading program establishe d in accordance with §52.38 or §52.39 under a Transport Rule Federal Implementation Plan need not require BART-eligible fossil fuel-fired steam electric plants in the State to install, oper ate, and maintain BART for the pollutant covered by such trading program in the State. A State that chooses to meet the emission reduction requirements of the Transport Rule by submitting a SIP revision that establishes a trading program and is approved as meeting the requirements of §52.38 or §52.39 also need not require BART-eligible fossil fuel-fired steam electric plan ts in the State to install, operate, and maintain BART for the pollutant covered by such trading prog ram in the State. A State may adopt provisions, consistent with the requirements applic able to the State for a trading program established in accordance with §52.38 or §52.39 und er the Transport Rule Federal Implementation Plan or established under a SIP revi sion that is approved as meeting the requirements of §52.38 or §52.39, for a geographic enhancement to the program to address any***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 117 of 142 requirement under §51.302(b) related to reasonably attributable impairment from the pollutant covered by such trading program in that State. (5) After a State has met the requirements for BART or implemented emissions trading program or other alternative measure that achieves more rea sonable progress than the installation and operation of BART, BART-eligible sources will be su bject to the requirements of paragraphs (d) and (f) of this section, as applicable, in the same manner as other sources.

* * * * * (f) Requirements for periodic comprehensive revisions o f implementation plans for regional haze. Each State identified in §51.300(b) must revise an d submit its regional haze implementation plan revision to EPA by July 31, 202 1, July 31, 2028, and every 10 years thereafter. The plan revision due on or before July 31, 2021 must include a commitment by the State to meet the requirements of paragraph (g). In each plan revision, the State must address regional haze in each mandatory Class I Federal are a located within the State and in each mandatory Class I Federal area located outside the State that may be affected by emissions from within the State. To meet the core requirements for regional haze for these areas, the State must submit an implementation plan containing the follow ing plan elements and supporting documentation for all required analyses: (1) Calculations of baseline, current, and natural visi bility conditions; progress to date; and the uniform rate of progress. For each mandatory Class I Federal area located wi thin the State, the State must determine the following: (i) Baseline visibility conditions for the most impaire d and clearest days . The period for establishing baseline visibility conditions is 2000 to 2004. For purposes of calculating and***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 118 of 142 displaying the uniform rate of progress, baseline v isibility conditions must be associated with the last day of this period. Baseline visibility condit ions must be calculated, using available monitoring data, by establishing the average decivi ew index for the most impaired and clearest days for each calendar year from 2000 to 2004. The baseline visibility conditions are the average of these annual values. For mandatory Class I Feder al areas without onsite monitoring data for 2000-2004, the State must establish baseline values using the most representative available monitoring data for 2000-2004, in consultation with the Administrator or his or her designee. For mandatory Class I Federal areas with incomplete dat a availability for 2000-2004, the State must establish baseline values using the closest 5 compl ete years of monitoring data. (ii) Natural visibility conditions for the most impaired and clearest days . Natural visibility conditions must be calculated by estimating the dec iview index existing under natural conditions for the most impaired and clearest days, based on a vailable monitoring information and appropriate data analysis techniques; and (iii) Current visibility conditions for the most impaired and clearest days . The period for calculating current visibility conditions is the mo st recent 5-year period for which data are available. Current visibility conditions must be ca lculated based on the annual average level of visibility impairment for the most impaired and cle arest days for each of these 5 years. Current visibility conditions are the average of these annu al values. (iv) Progress to date for the most impaired and clearest days . Actual progress made towards natural conditions since the baseline period, and a ctual progress made during the previous implementation period up to and including to the pe riod for calculating current visibility conditions, for the most impaired and clearest days , must be calculated.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 119 of 142 (v) Difference between current visibility conditions an d natural visibility conditions . The number of deciviews by which current visibility conditions exceed natural visibility conditions, for the most impaired and clearest days, must be calculated

. (vi) Uniform rate of progress . (A) The uniform rate of progress for each mandato ry Class I Federal area in the State must be calculated. To ca lculate this uniform rate of progress, the State must compare baseline visibility conditions to natu ral visibility conditions in the mandatory Class I Federal area and determine the uniform rate of visibility improvement (measured in deciviews of improvement per year) that would need to be maintained during each implementation period in order to attain natural vi sibility conditions by the end of 2064. (B) The State may submit a request to the Administr ator seeking an adjustment to the uniform rate of progress for a mandatory Class I Federal ar ea to account for impacts from (1) anthropogenic sources outside the United States and /or (2) wildland prescribed fires that were conducted under a multi-year land or resource manag ement plan for a wildland area that has a stated objective to establish, restore, or maintain sustainable and resilient wildland ecosystems ,

or to preserve endangered or threatened species throug h a program of prescribed fire , or to reduce the risk of catastrophic wildfires and that provides for the use of appropriate basic smoke management practices. To calculate the proposed adj ustment, the State must add the estimated impacts to natural visibility conditions and compar e the resulting value to baseline visibility conditions. If the Administrator determines that th e State has estimated the impacts from anthropogenic sources outside the United States or wildland prescribed fires using scientifically valid data and methods, the Administrator may appro ve the proposed adjustment to the uniform rate of progress for use in the State’s implementat ion plan.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 120 of 142 (2) Long-term strategy for regional haze and reasonably attributable visibility impairment. Each State must submit a long-term strategy that address es regional haze visibility impairment, and if necessary any reasonably attributable visibility im pairment certified by the Federal Land Manager under §51.302(a), for each mandatory Class I Federal area within the State and for each mandatory Class I Federal area located outside the State that may be affected by emissions from the State. The long-term strategy must include the enforceable emissions limitations, compliance schedules, and other measures that are necessary to achieve reasonable progress, as determined pursuant to (f)(2)(i) through (vi). In establishing its long-term strategy for regional haze, the State must meet the following requirements: (i) The State must consider and analyze emission re duction measures based on the costs of compliance, the time necessary for compliance, the energy and non-air quality environmental impacts of compliance, and the remaining useful lif e of any potentially affected major or minor stationary source or group of sources. The State mu st document the criteria used to determine which sources or groups of sources were evaluated, and how these four factors were taken into consideration in selecting the measures for inclusi on in its long-term strategy. (ii) The State must consider the uniform rate of im provement in visibility, the emission reduction measures identified in (f)(2)(i), and additional me asures being adopted by other contributing states in (f)(2)(iii) as needed to make reasonable progress towards natural visibility conditions for the period covered by the implementation plan. (iii) The State must consult with those States whic h may reasonably be anticipated to cause or contribute to visibility impairment in the mandator y Class I Federal area.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 121 of 142 (A) Contributing States . Where the State has emissions that are reasonably anticipated to contribute to visibility impairment in any mandator y Class I Federal area located in another State or States, the State must consult with the other St ate(s) in order to develop coordinated emission management strategies. The State must demonstrate t hat it has included in its implementation plan all measures necessary to obtain its share of the emission reductions needed to provide for reasonable progress towards natural visibility cond itions in the mandatory Class I Federal area located in the other State or States. If the State has participated in a regional planning process, the State must also ensure that it has included all measures needed to achieve its apportionment of emission reduction obligations agreed upon throu gh that process. (B) States affected by contributing States . A State with a mandatory Class I Federal area mus t consult with any other State having emissions that are reasonably anticipated to contribute to visibility impairment in that area regarding the em ission reductions needed in each State to provide for reasonable progress towards natural vis ibility conditions in that area. If the State has participated in a regional planning process, the St ate must ensure it has included all measures needed to achieve its apportionment of emission red uction obligations agreed upon through that
process. (C) In any situation in which a State cannot agree with another State or group of States on the emission reductions needed for reasonable progress towards natural visibility conditions in any mandatory Class I Federal area, each involved State must describe in its submittal the actions taken to resolve the disagreement. In reviewing the State's implementation plan submittal, the Administrator will take this information into accou nt in determining whether the State's implementation plan provides for reasonable progres s towards natural visibility conditions at***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 122 of 142 each mandatory Class I Federal area that is located in the State or that may be affected by emissions from the State. All substantive interstat e consultations must be documented. (iv) As part of the demonstration required by (f)(2 )(i), the State must document the technical basis, including information on the factors listed in (f)(2)(i) and modeling, monitoring, and emissions information, on which the State is relyin g to determine the emission reductions from anthropogenic sources in the State that are necessa ry for achieving reasonable progress towards natural visibility conditions in each mandatory Cla ss I Federal area it affects. The State may meet this requirement by relying on technical analyses d eveloped by a regional planning process and approved by all State participants. The State must identify the baseline emissions inventory on which its strategies are based. The baseline emissi ons inventory year shall be the most recent year for which the State has submitted emission inv entory information to the Administrator in compliance with the triennial reporting requirement s of subpart A of this part unless the State adequately justifies the use of another inventory y ear. (v) The State must identify all anthropogenic sourc es of visibility impairment considered by the State in developing its long-term strategy and the criteria used to select the sources considered. The State should consider major and minor stationar y sources, mobile sources, and area sources. (vi) The State must consider, at a minimum, the fol lowing factors in developing its long-term strategy: (A) Emission reductions due to ongoing air pollutio n control programs, including measures to address reasonably attributable visibility impairme nt; (B) Measures to mitigate the impacts of constructio n activities; (C) Emissions limitations and schedules for complia nce to achieve the reasonable progress goal;***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 123 of 142 (D) Source retirement and replacement schedules; (E) Basic smoke management practices for prescribed fire used for agricultural and wildland vegetation management purposes and smoke management programs as currently exist within the State for these purposes; (F) Enforceability of emissions limitations and con trol measures; and (G) The anticipated net effect on visibility due to projected changes in point, area, and mobile source emissions over the period addressed by the l ong-term strategy. (3) Reasonable progress goals. (i) A state in which a mandatory Class I Federal a rea is located must establish reasonable progress goals (expressed in deciviews) that reflect the visibility conditions that are projected to be achieved by the end of the applicable implementation period as a result of all enforceable emissions limitation s, compliance schedules, and other measures required under paragraph (f)(2) and the implementat ion of other requirements of the CAA. The long-term strategy and the reasonable progress goal s must provide for an improvement in visibility for the most impaired days and ensure no degradation in visibility for the clearest days since the baseline period. (ii)(A) If a State in which a mandatory Class I Fed eral area is located establishes a reasonable progress goal for the most impaired days that provi des for a slower rate of improvement in visibility than the uniform rate of progress calcul ated under paragraph (f)(1)(vi) of this section, the State must demonstrate, based on the analysis r equired by paragraph (f)(2)(i) of this section, that there are no additional emission reduction mea sures for anthropogenic sources or groups of sources in the State that may reasonably be anticip ated to contribute to visibility impairment in the Class I area that would be reasonable to includ e in the long-term strategy. The State must***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 124 of 142 provide a robust demonstration, including documenti ng the criteria used to determine which sources or groups or sources were evaluated and how the four factors required by paragraph (f)(2)(i) were taken into consideration in selectin g the measures for inclusion in its long-term strategy. The State must provide to the public for review as part of its implementation plan an assessment of the number of years it would take to attain natural visibility conditions if visibility improvement were to continue at the rate of progres s selected by the State as reasonable for the implementation period. (B) If a State contains sources which are reasonabl y anticipated to contribute to visibility impairment in a mandatory Class I Federal area in a nother State for which a demonstration by the other State is required under (f)(3)(ii)(A), th e State must demonstrate that there are no additional emission reduction measures for anthropo genic sources or groups of sources in the State that may reasonably be anticipated to contrib ute to visibility impairment in the Class I area that would be reasonable to include in its own long -term strategy. (iii) The reasonable progress goals established by the State are not directly enforceable but will be considered by the Administrator in evaluating th e adequacy of the measures in the implementation plan in providing for reasonable pro gress towards achieving natural visibility conditions at that area. (iv) In determining whether the State’s goal for vi sibility improvement provides for reasonable progress towards natural visibility conditions, the Administrator will also evaluate the demonstrations developed by the State pursuant to p aragraphs (f)(2) and (f)(3)(ii)(A) of this section and the demonstrations provided by other St ates pursuant to paragraphs (f)(2) and (f)(3)(ii)(B) of this section.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 125 of 142 (4) If the Administrator, Regional Administrator, or the affected Federal Land Manager has advised a State of a need for additional monitoring to assess reasonably attributable visibility impairment at a mandatory Class I Federal area in a ddition to the monitoring currently being conducted, the State must include in the plan revis ion an appropriate strategy for evaluating reasonably attributable visibility impairment in th e mandatory Class I Federal area by visual observation or other appropriate monitoring techniq ues. (5) So that the plan revision will serve also as a progress report, the State must address in the plan revision the requirements of paragraphs (g)(1) , (g)(2), (g)(4), and (g)(5) of this section. However, the period to be addressed for these eleme nts shall be the period since the past progress report. (6) Monitoring strategy and other implementation plan r equirements . The State must submit with the implementation plan a monitoring strategy for measuring, characterizing, and reporting of regional haze visibility impairment that is repr esentative of all mandatory Class I Federal areas within the State. Compliance with this requir ement may be met through participation in the Interagency Monitoring of Protected Visual Environm ents network. The implementation plan must also provide for the following: (i) The establishment of any additional monitoring sites or equipment needed to assess whether reasonable progress goals to address regional haze for all mandatory Class I Federal areas within the State are being achieved. (ii) Procedures by which monitoring data and other information are used in determining the contribution of emissions from within the State to regional haze visibility impairment at mandatory Class I Federal areas both within and out side the State.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 126 of 142 (iii) For a State with no mandatory Class I Federal areas, procedures by which monitoring data and other information are used in determining the c ontribution of emissions from within the State to regional haze visibility impairment at mandatory Class I Federal areas in other States. (iv) The implementation plan must provide for the r eporting of all visibility monitoring data to the Administrator at least annually for each mandat ory Class I Federal area in the State. To the extent possible, the State should report visibility monitoring data electronically. (v) A statewide inventory of emissions of pollutant s that are reasonably anticipated to cause or contribute to visibility impairment in any mandator y Class I Federal area. The inventory must include emissions for a baseline year, emissions fo r the most recent year for which data are available, and estimates of future projected emissi ons. The State must also include a commitment to update the inventory periodically. (vi) Other elements, including reporting, recordkee ping, and other measures, necessary to assess and report on visibility. (g) Requirements for periodic reports describing progre ss towards the reasonable progress goals . Each State identified in §51.300(b) must periodic ally submit a report to the Administrator evaluating progress towards the reasonable progress goal for each mandatory Class I Federal area located within the State and in each mandatory Class I Federal area located outside the State that may be affected by emissions from within the S tate. The first progress report is due 5 years from submittal of the initial implementation plan a ddressing paragraphs (d) and (e) of this section. The first progress reports must be in the form of implementation plan revisions that comply with the procedural requirements of §51.102 and §51.103. Subsequent progress reports are due by January 31, 2025, July 31, 2033, and eve ry 10 years thereafter. Subsequent progress***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 127 of 142 reports must be made available for public inspectio n and comment for at least 60 days prior to submission to EPA and all comments received from th e public must be submitted to EPA along with the subsequent progress report, along with an explanation of any changes to the progress report made in response to these comments. Periodic progress reports must contain at a minimum the following elements:

* * * * * (3) For each mandatory Class I Federal area within the State, the State must assess the following visibility conditions and changes, with values for most impaired, least impaired and/or clearest days as applicable expressed in terms of 5-year ave rages of these annual values. The period for calculating current visibility conditions is the mo st recent 5-year period preceding the required date of the progress report for which data are avai lable as of a date 6 months preceding the required date of the progress report. (i)(A) Progress reports due before January 31, 2025 . The current visibility conditions for the most impaired and least impaired days. (B) Progress reports due on and after January 31, 2 025. The current visibility conditions for the most impaired and clearest days; (ii) (A) Progress reports due before January 31, 20 25. The difference between current visibility conditions for the most impaired and least impaired days and baseline visibility conditions. (B) Progress reports due on and after January 31, 2 025. The difference between current visibility conditions for the most impaired and clearest days and baseline visibility conditions.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 128 of 142 (iii) (A) Progress reports due before January 31, 2 025. The change in visibility impairment for the most impaired and least impaired days over the period since the period addressed in the most recent plan required under paragraph (f) of this se ction. (B) Progress reports due on and after January 31, 2 025. The change in visibility impairment for the most impaired and clearest days over the period since the period addressed in the most recent plan required under paragraph (f) of this section. (4) An analysis tracking the change over the period since the period addressed in the most recent plan required under paragraph (f) of this section i n emissions of pollutants contributing to visibility impairment from all sources and activiti es within the State. Emissions changes should be identified by type of source or activity. With r espect to all sources and activities, the analysis must extend at least through the most recent year f or which the state has submitted emission inventory information to the Administrator in compl iance with the triennial reporting requirements of subpart A of this part. With respec t to sources that report directly to a centralized emissions data system operated by the Administrator , the analysis must extend through the most recent year for which the Administrator has provide d a State-level summary of such reported data or an internet-based tool by which the State m ay obtain such a summary. The State is not required to backcast previously reported emissions to be consistent with more recent emissions estimation procedures, and may draw attention to ac tual or possible inconsistencies created by changes in estimation procedures. (5) An assessment of any significant changes in ant hropogenic emissions within or outside the State that have occurred since the period addressed in the most recent plan required under paragraph (f) of this section including whether or not these changes in anthropogenic emissions***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 129 of 142 were anticipated in that most recent plan and wheth er they have limited or impeded progress in reducing pollutant emissions and improving visibili ty. (6) An assessment of whether the current implementa tion plan elements and strategies are sufficient to enable the State, or other States wit h mandatory Class I Federal areas affected by emissions from the State, to meet all established r easonable progress goals for the period covered by the most recent plan required under paragraph (f ) of this section. (h) Determination of the adequacy of existing implement ation plan. At the same time the State is required to submit any progress report to EPA in ac cordance with paragraph (g) of this section, the State must also take one of the following actio ns based upon the information presented in the progress report: (1) If the State determines that the existing imple mentation plan requires no further substantive revision at this time in order to achieve establish ed goals for visibility improvement and emissions reductions, the State must provide to the Administrator a declaration that revision of the existing implementation plan is not needed at t his time.

* * * * * (i) * * * (2) The State must provide the Federal Land Manager with an opportunity for consultation, in person at a point early enough in the State’s techn ical and policy analyses of its long-term strategy emission reduction obligation and prior to development of reasonable progress goals so that information and recommendations provided by th e Federal Land Manager can meaningfully inform the State’s development of the long-term str ategy. The opportunity for consultation will be deemed to have been early enough if the consulta tion has taken place at least 120 days prior to***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 130 of 142 holding any public hearing or other public comment opportunity on an implementation plan (or plan revision) or progress report for regional haze required by this subpart. The opportunity for consultation must be provided no less than 60 days prior to said public hearing or public comment opportunity. This consultation must include the opportunity for the affected Federal Land Managers to discuss their:

* * * * * (3) In developing any implementation plan (or plan revision) or progress report, the State must include a description of how it addressed any comme nts provided by the Federal Land Managers. (4) The plan (or plan revision) must provide proced ures for continuing consultation between the State and Federal Land Manager on the implementatio n of the visibility protection program required by this subpart, including development and review of implementation plan revisions and progress reports, and on the implementation of othe r programs having the potential to contribute to impairment of visibility in mandatory Class I Fe deral areas. 10. In §51.309: a. Revise paragraphs (d)(4)(v), (d)(10), (d)(10)(i) introductory text, (d)(10)(ii) introductory text, and (g)(2)(iii). b. Add new paragraphs (d)(10)(iii) and (d)(10)(iv).

The revisions and additions read as follows: §51.309 Requirements related to the Grand Canyon Visibility Transport Commission.

* * * * * (d) * * ****E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 131 of 142 (4) * * * (v) Market Trading Program. The implementation plan must include requirements for a market trading program to be implemented in the event that a milestone is not achieved. The plan shall require that the market trading program be activate d beginning no later than 15 months after the end of the first year in which the milestone is not achieved. The plan shall also require that sources comply, as soon as practicable, with the re quirement to hold allowances covering their emissions. Such market trading program must be suff icient to achieve the milestones in paragraph (d)(4)(i) of this section, and must be co nsistent with the elements for such programs outlined in §51.308(e)(2)(vi). Such a program may i nclude a geographic enhancement to the program to address the requirement under §51.302(b) related to reasonably attributable impairment from the pollutants covered under the pr ogram.
* * * * * (10) Periodic implementation plan revisions and progress reports. Each Transport Region State must submit to the Administrator periodic reports i n the years 2013 and as specified for subsequent progress reports in §51.308(g). The prog ress report due in 2013 must be in the form of an implementation plan revision that complies wi th the procedural requirements of §§51.102 and 51.103. (i) The report due in 2013 will assess the area for reasonable progress as provided in this section for mandatory Class I Federal area(s) located withi n the State and for mandatory Class I Federal area(s) located outside the State that may be affec ted by emissions from within the State. This demonstration may be based on assessments conducted by the States and/or a regional planning body. The progress report due in 2013 must contain at a minimum the following elements:***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 132 of 142 * * * * * (ii) At the same time the State is required to subm it the 5-year progress report due in 2013 to EPA in accordance with paragraph (d)(10)(i) of this section, the State must also take one of the following actions based upon the information presen ted in the progress report:

* * * * * (iii) The requirements of §51.308(g) regarding requ irements for periodic reports describing progress towards the reasonable progress goals appl y to States submitting plans under this section, with respect to subsequent progress report s due after 2013. (iv) The requirements of §51.308(h) regarding deter minations of the adequacy of existing implementation plans apply to States submitting pla ns under this section, with respect to subsequent progress reports due after 2013.

* * * * * (g) * * * (2) * * * (iii) The Transport Region State may consider wheth er any strategies necessary to achieve the reasonable progress goals required by paragraph (g) (2) of this section are incompatible with the strategies implemented under paragraph (d) of this section to the extent the State adequately demonstrates that the incompatibility is related to the costs of the compliance, the time necessary for compliance, the energy and non air quality envi ronmental impacts of compliance, or the remaining useful life of any existing source subjec t to such requirements.

PART 52 – APPROVAL AND PROMULGATION OF IMPLEMENTATI ON PLANS***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 133 of 142 1. The authority citation for part 52 continues to read as follows:
Authority : 42 U.S.C. 7401 et seq

.
2. In §52.26:

a. Remove and reserve the entire section.

The removal reads as follows:

§52.26 [Reserved]

* * * * *

3. In §52.29:

a. Remove and reserve the entire section.

The removal reads as follows:

§52.29 [Reserved]

* * * * *

4. In §52.29: a. Remove and reserve paragraph (b).

The removal reads as follows: §52.61 Visibility protection.
* * * * ****E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 134 of 142 (b) [Reserved]
* * * * * 5. In §52.145: a. Revise paragraph (b). b. Remove and reserve paragraph (c).

The revisions and removal read as follows: §52.145 Visibility protection.
* * * * * (b) Regulations for visibility monitoring and new s ource review. The provisions of §§52.27 and 52.28 are hereby incorporated and made part of the applicable plan for the State of Arizona. (c) [Reserved]
* * * * * 6. In §52.281: a. Remove and reserve paragraphs (b) and (e).

The removals read as follows: §52.281 Visibility protection.
* * * * * (b) [Reserved]
* * * * * (e) [Reserved]
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Page 135 of 142 7. In §52.344: a. Revise paragraph (b).

The revision reads as follows: §52.344 Visibility protection.
* * * * * (b) The Visibility NSR regulations are approved for industrial source categories regulated by the NSR and PSD regulations which have previously been approved by EPA. However, Colorado's NSR and PSD regulations have been disapproved for c ertain sources as listed in 40 CFR 52.343(a)(1). The provisions of 40 CFR 52.28 are he reby incorporated and made a part of the applicable plan for the State of Colorado for these sources. * * * * * 8. In §52.633: a. Revise paragraph (b). b. Remove and reserve paragraph (c).

The revisions and removal read as follows: §52.633 Visibility protection.
* * * * * (b) Regulations for visibility monitoring and new s ource review. The provisions of §§52.27 and 52.28 are hereby incorporated and made part of the applicable plan for the State of Hawaii. (c) [Reserved]
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Page 136 of 142 9. In §52.690: a. Remove and reserve paragraphs (b) and (c).

The removals read as follows: §52.690 Visibility protection.
* * * * * (b) [Reserved] (c) [Reserved]
* * * * * 10. In §52.1033: a. Remove and reserve paragraphs (a) and (c).

The removals read as follows: §52.1033 Visibility protection. (a) [Reserved]
* * * * * (c) [Reserved]
* * * * * 11. In §52.1183: a. Revise paragraph (b). b. Remove and reserve paragraphs (a) and (c).

The revision and removals read as follows: §52.1183 Visibility protection.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 137 of 142 (a) [Reserved] (b) Regulation for visibility monitoring and new so urce review. The provisions of §52.28 are hereby incorporated and made a part of the applicab le plan for the State of Michigan. (c) [Reserved]
* * * * * 12. In §52.1236: a. Revise paragraph (b). b. Remove and reserve paragraph (c).

The revisions and removal read as follows: §52.1236 Visibility protection.
* * * * * (b) Regulation for visibility monitoring and new so urce review. The provisions of §52.28 are hereby incorporated and made a part of the applicab le plan for the State of Minnesota. (c) [Reserved]
* * * * * 13. In §52.1339: a. Remove and reserve paragraph (b).

The removal reads as follows: §52.1339 Visibility protection.
* * * * * (b) [Reserved]***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 138 of 142 * * * * * 14. In §52.1387: a. Remove and reserve paragraph (b).

The removal reads as follows: §52.1387 Visibility protection.
* * * * * (b) [Reserved]
* * * * * 15. In §52.1488: a. Revise paragraph (b). b. Remove and reserve paragraph (c).

The revisions and removal read as follows: §52.1488 Visibility protection.
* * * * * (b) Regulation for visibility monitoring and new so urce review. The provisions of §52.28 are hereby incorporated and made a part of the applicab le plan for the State of Nevada except for that portion applicable to the Clark County Departm ent of Air Quality and Environmental Management.
* * * * * 16. In §52.1531: a. Revise paragraph (b).***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 139 of 142 b. Remove and reserve paragraph (c).

The revisions and removal read as follows: 52.1531 Visibility protection.
* * * * * (b) Regulation for visibility monitoring and new so urce review. The provisions of §52.28 are hereby incorporated and made a part of the applicab le plan for the State of New Hampshire. (c) [Reserved]
* * * * * 17. In §52.2132: a. Remove and reserve paragraphs (b) and (c).

The removals read as follows: §52.2132 Visibility protection.
* * * * * (b) [Reserved] (c) [Reserved]
* * * * * 18. In §52.2179: a. Revise paragraph (b). b. Remove and reserve paragraph (c).

The revisions and removal read as follows: §52.2179 Visibility protection.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 140 of 142 * * * * * (b) Regulation for visibility monitoring and new so urce review. The provisions of §52.28 are hereby incorporated and made a part of the applicab le plan for the State of South Dakota. (c) [Reserved]
* * * * * 19. In §52.2304: a. Remove and reserve paragraph (b).

The removal reads as follows: §52.2304 Visibility protection.
* * * * * (b) [Reserved]
* * * * * 20. In §52.2383: a. Revise paragraph (b).

The revisions read as follows: §52.2383 Visibility protection.

* * * * * (b) Regulations for visibility monitoring and new s ource review. The provisions of §52.27 are hereby incorporated and made part of the applicable plan for the State of Vermont.
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Page 141 of 142 21. In §52.2452: a. Revise paragraph (a). b. Remove and reserve paragraphs (b) and (c).

The revisions and removals read as follows: §52.2452 Visibility protection. (a) Reasonably Attributable Visibility Impairment. The requirements of section 169A of the Clean Air Act are not met because the plan does not include approvable measures for meeting the requirements of 40 CFR 51.305 for protection of visibility in mandatory Class I Federal

areas. (b) [Reserved] (c) [Reserved]

* * * * * 22. In §52.2533: a. Revise paragraphs (a) and (b). b. Remove and reserve paragraph (c).

The revisions and removal read as follows: §52.2533 Visibility protection. (a) Reasonably Attributable Visibility Impairment. The requirements of section 169A of the Clean Air Act are not met because the plan does not include approvable measures for meeting the requirements of 40 CFR 51.305 and 51.307 for pr otection of visibility in mandatory Class I Federal areas.***E.O. 12866 Review – Draft – Do not Cite, Quote o r Release During Review*** EO12866_Regional Haze_2060-AS55_Proposal_FRN_201601 21

Page 142 of 142 (b) Regulation for visibility monitoring and new so urce review. The provisions of §52.28 are hereby incorporated and made a part of the applicab le plan for the State of West Virginia. (c) [Reserved]
* * * * * 23. In §52.2781: a. Remove and reserve paragraphs (b) and (c).

The removals read as follows: §52.2781 Visibility protection.
* * * * * (b) [Reserved] (c) [Reserved]