The EPA Regional Administrator, Jared Blumenfe ld signed the following rule on August 19, 2015 and EPA is submitting it for publication in the Fede ral Register (FR). While we have taken steps to ensure the accuracy of this version of this rule , it is not the official version. Please refer to the official version in a forthcoming FR publicatio n appearing on the Government Printing Office website, http://fdsys.gpo.gov/fdsys/search/home.action , and on www.regulations.gov in Docket Number EPA-R09-OAR-2015-0316. 6560-50-P

ENVIRONMENTAL PRO TECTION AGENCY

40 CFR Part 52
EPA-R09-OAR-2015-0316; FRLApproval and Promulgation of State Implementation Plans; Nevada; Regional Haze Progress Report

AGENCY: Environmental Protection Agency.

ACTION: Proposed rule.

SUMMARY: The United States Environmental Protec tion Agency (EPA) proposes to approve a revision to the Nevada Regional Haze State Impl ementation Plan (SIP) submitted by the Nevada Division of Environmental Protectio n (NDEP) to document that the existing plan is adequate to achieve established goals for visibility im provement and emissions reductions by 2018. The Nevada Regional Haze SIP revision addresses the Regional Haze Rule (RHR) requirements under the Clean Air Act (CAA) to submit a report describing progress in achieving reasonable progress goals (RPGs) to improve visibility in federally designat ed Class I areas in Nevada and in nearby states that may be affected by emissi ons from sources in Nevada. EPA is proposing to approve Nevada’s determination that the existing Nevada Regional Haze Implementation Plan is adequate to meet the visibility goals, and re quires no substantive revision at this time.

DATE: Comments must be received by th e designated contact at the address listed below on or before [ insert date 30 days after date of publication in the Federal Register ].This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 2 of 45 ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R09-OAR-2015- 0316, to the Federal eRulemaking Portal : http://www.regulations.gov . Follow the online instructions for submitting comments. Once submitted, comments cannot be edited or withdrawn. EPA may publish a ny comment received to its public docket. Do not submit electronically any information you consider to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. If you need to include CBI as part of your comment, please visit http://www.epa.gov/dockets/comments.html for instructions. Multimedia submissions (audio, video, etc.) must be accompanied by a written comment. The written comment is considered the official comme nt and should include di scussion of all points you wish to make. For additional submission methods, the full EPA public comment policy, and general guidance on making effective comments, please visit http://www.epa.gov/dockets/comments.html

. The index to the docket (docket number EPA-R09-OAR-2015-0316) for this proposed rule is available electronically at http://www.regulations.gov . Although listed in the index, some information is not publicly availa ble, such as CBI or other info rmation that is restricted by statute. Certain other material, such as copyrighted material, is publicly available only in hard copy form. Publicly available docket mate rials are available electronically at http://www.regulations.gov or in hard copy during normal busin ess hours at the Planning Office of the Air Division, AIR-2, EPA Region 9, 75 Ha wthorne Street, San Francisco, CA 94105. To view hard copies of documents listed in the docket index, EP A requests that you contact the individual listed in the FOR FURT HER INFORMATION CONTACT section.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 3 of 45 FOR FURTHER INFORMATION CONTACT: Vijay Limaye, U.S. EPA, Region 9, Planning Office, Air Division, AIR-2, 75 Hawthorne Street, San Franci sco, CA 94105. Vijay Limaye may be reached at telephone number (415) 972-3086 and via electronic mail at Limaye.Vijay@epa.gov.

SUPPLEMENTARY INFORMATION: Throughout this document “we,” “us,” or “our” refer
to EPA.

Table of Contents I. Overview of Proposed Action II. Background A. Description of Regional Haze B. History of Regional Haze Rule C. Nevada’s Regional Haze Plan III. Requirements for Regional Haze Progress Reports IV. Context for Understanding Nevada’s Progress Report A. Framework for Measuring Progress B. Relevant Class I Areas
C. Data Sources V. EPA’s Evaluation of Nevada’s Progress Report

A. Status of Implementation of All Measures B. Summary of Emission Reductions Achieved C. Assessment of Visibility Conditions and Changes at Jarbidge D. Analysis of Changes in EmissionsThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 4 of 45

E. Assessment of Anthropogenic Emissions Impeding Progress F. Assessment of Plan Elements and Strategy G. Review of Visibili ty Monitoring Strategy H. Determination of Adequacy I. Consultation with Federal Land Managers J. Public Participation VI. EPA’s Proposed Action VII. Statutory and Executive Order Reviews
I. Overview of Proposed Action EPA is proposing to approve NDEP’s determin ation that the existing Nevada Regional Haze Implementation Plan 1 is adequate to achieve the establis hed RPGs (i.e., visibility goals) for Class I areas by 2018, and therefor e requires no substantive revisi on at this time. The State’s determination and EPA’s proposed approval ar e based on the Nevada Regional Haze 5-Year Progress Report (“Progress Report” or “Repor t”) submitted by NDEP to EPA on November 18, 2014, that addresses 40 CFR 51.308(g), (h), and (i) of the RHR. 2 Specifically, we propose to find that the Progress Report demonstrates that the em ission control measures in the existing Nevada Regional Haze SIP are sufficient to enable Nevada , as well as other states with Class I areas affected by emissions from sources in Nevada , to meet all established RPGs for 2018 in accordance with 51.308(g). As a result, we propose to approve NDEP’s determination that the

1 The Nevada Regional Haze Implementation Plan consists of the Nevada Regional Haze SIP, submitted to EPA in November 2009 and partially approved and partially disappro ved by EPA in several related actions in 2012, and the partial Regional Haze Federal Implementation Plan (FIP) pr omulgated in 2012 and revi sed in 2013, as described further below. 2 The Progress Report was deemed complete by operation of law on May 18, 2015.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 5 of 45 existing Implementation Plan is adequate, and re quires no further substantive revision at this time to achieve the established goals for visibil ity improvement in accordance with 51.308(h). In addition, we are proposing to find that NDEP fulfilled the requirements in 51.308(i)(2), (3), and (4) regarding State coordination with Federa l Land Managers (FLMs). This coordination includes providing FLMs with an opportunity fo r consultation on the Progress Report, describing how NDEP addressed any comments from the FL Ms, and providing procedures for continuing consultation with the FLMs. Finally, we propose to find that NDEP has fulfilled the requirements of CAA 110(a) and (l) and 40 CFR 51.102 regarding reasonable notice and public hearings with regard to the Progress Report.
II. Background A. Description of Regional Haze Regional haze is visibility impairment produ ced by many sources and activities located across a broad geographic area that emit fine par ticles that impair visibility by scattering and absorbing light, thereby reducing th e clarity, color, and visible distance that one can see. These fine particles also can cause serious health e ffects and mortality in humans and contribute to environmental impacts, such as acid depos ition and eutrophicati on of water bodies. The RHR uses the deciview as the principle metric for measuring visibility and for the RPGs that serve as interim visibility goals towa rd meeting the national go al of achieving natural visibility conditions by 2064. A deciview expres ses uniform changes in haziness in terms of common increments across the entire range of visi bility conditions, from pristine to extremely hazy conditions. Deciviews are determined by us ing air quality measurement to estimate light extinction, and then transforming the value of lig ht extinction using a logarithmic function. A deciview is a more useful measure for tracki ng progress in improving vi sibility than lightThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 6 of 45 extinction because each deciview change is an equal incremental change in visibility perceived by the human eye. Most people can detect a change in visibility at one deciview.
B. History of Regional Haze Rule In section 169A(a)(1) of the CAA Amendmen ts of 1977, Congress created a program to protect visibility in designated national parks and wilderness ar eas, establishing as a national goal the “prevention of any future, and the remedyi ng of any existing, impairment of visibility in mandatory Class I Federal areas which impairme nt results from manmad e air pollution.” In accordance with section 169A of the CAA and after consulting with the Department of Interior, EPA promulgated a list of 156 manda tory Class I Federal areas wher e visibility is identified as an important value. 3 In this notice, we refer to mandatory Class I Federal areas on this list as “Class I areas.” Nevada has one Class I area, Jarbidge Wilderness Area (“Jarbidge”), in the northeast corner of the State. With the CAA Amendments of 1990, Congress added section 169B to address regional haze issues. EPA promulgated a rule to addr ess regional haze on July 1, 1999, known as the Regional Haze Rule. 4 The RHR revised the existing visibi lity regulations in 40 CFR 51.308 to integrate provisions addressing regional haze impairment and to establish a comprehensive visibility protection program for Class I areas. As defined in the RHR, the RPGs must provide for an improvement in visibility for the most im paired days (“worst days”) over the period of the implementation plan and ensure no degradation in visibility for the least impaired days (“best days”) over the same period. 5

3 44 FR 69122, November 30, 1979. 4 See 64 FR 35713. 5 40 CFR 51.308(d)(1).This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 7 of 45 C. Nevada’s Regional Haze Plan NDEP submitted its Regional Haze SIP to EPA on November 18, 2009, as required by 40 CFR 51.308 for the first regional haze planning period ending in 2018. EPA approved most of the Nevada Regional Haze SIP on March 26, 2012, 6 with the exception of NDEP’s determination of best available retrofit t echnology (BART) to control emi ssions of nitrogen oxides (NO X ) at the Reid Gardner Generating Station (Reid Gar dner). EPA published a new proposal on April 12, 2012, to approve in part and disapprove in part NDEP’s BART determination for NO X at Reid
Gardner. 7 EPA published a final rule on August 23, 2012, approving NDEP’s BART determination for NO X on Units 1 and 2, but disapproving NDEP’s determination for Unit 3 and the averaging time for the emission limits at all three units. 8 This final rule included a Federal Implementation Plan (FIP) for the disapproved elem ents. EPA subsequently agreed to reconsider the compliance date for Units 1, 2, and 3 at Reid Gardner in the FIP, which we extended by 18
months. 9

III. Requirements for Regional Haze Progress Reports The RHR requires states to submit a report ever y five years in the form of a SIP revision to evaluate progress toward achieving the RPGs for each Class I area in the state and for those areas outside the state that may be affected by emissions from within the state. 10 The first progress reports are due five y ears from the submittal date of each state’s initial Regional Haze SIP. Progress reports must be in the form of SIP revisions that comply with the procedural

6 See 77 FR 17334. 7 See 77 FR 21896. 8 See 77 FR 50936. 9 See proposed rule to grant extension, 78 FR 18280 (March 26, 2013), and final rule granting extension, 78 FR 53033 (August 28, 2013). 10 40 CFR 51.308(g).This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 8 of 45 requirements of 40 CFR 51.102 and 51.103. These reports must contain an evaluation of seven elements, at a minimum, and include a determin ation of the adequacy of the state’s existing Regional Haze SIP. In summary, 11 the seven elements are: 1) a description of the status of implementation of all measures included in the current Regional Haze SIP for achieving the RPGs in Class I areas within and outside the st ate; 2) a summary of the emission reductions achieved in the state through implementation of th ese measures; 3) an assessment of visibility conditions and changes on the most impaired and l east impaired days for each Class I area in the state in terms of five-year averag es of the annual values; 4) an an alysis of changes in emissions over the past five years contributing to visibi lity impairment from all sources and activities within the state based on the most recently updated emissions inventory; 5) an assessment of any significant changes in anthropogenic emissions within or outside the state over the past five years that have limited or impeded progress in reduc ing pollutant emissions and improving visibility; 6) an assessment of whether th e elements and strategies in the current Regional Haze SIP are sufficient to enable the state, or other states affected by its emi ssions, to achieve the established RPGs; and 7) a review of the state’s visi bility monitoring strategy and any necessary modifications. Based on an evaluation of the factors lis ted above as well as any other relevant information, a state is required to determine th e adequacy of its existing Regional Haze SIP. 12 The state must take one of four possible actions based on the analysis in its progress report. In summary, these actions are to 1) provide a negative declaration to EPA that no further substantive revisions to the state’s existing Region al Haze SIP is needed to achieve the RPGs; 2)

11 Please refer to 40 CFR 51.308 (g) for the exact requirements. 12 40 CFR 51.308(h).This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 9 of 45 provide notification to EPA and to other states in its region that its Regional Haze SIP is or may be inadequate to ensure reasonable progress due to emissions from sources in other states, and collaborate with other states to develop additional st rategies to address the deficiencies; 3) provide notification and available information to EPA that the state’s Regional Haze SIP is or may be inadequate to ensure reasonable progress due to emissi ons from sources in another country; or 4) revise its Regional Haze SIP within one year to addre ss the deficiencies if the state determines that its existing plan is or may be inad equate to ensure reasonable progress in one or
more Class I areas due to emissions from sources within the state. 13
A state also must document that it provided FLMs with an opportunity for consultation prior to holding a public hearing on a Regional Haze SIP or plan revision. 14 A state must include a description of how it addressed any comments from the FLMs, and provide procedures for continuing consultation with the FLMs. 15

IV. Context for Understanding Nevada’s Progress Report To facilitate a better understanding of the Pr ogress Report as well as EPA’s evaluation of the Report, this section provides background in formation on how the regional haze program applies to Nevada. This information describes th e framework for measuring visibility progress, a profile of the relevant Class I areas, and the sources of data used in the Progress Report. Framework for Measuring Progress: Visibility conditions at Class I areas are described by a “haze index” measured in deciviews and calculated using data collected from the Interagency Monitoring of Protected Visual Environments (IMPROVE) network monitors.

13 Id. 14 40 CFR 51.308(i)(2). 15 40 CFR 51.308(i)(3) and (4).This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 10 of 45 Nevada has an IMPROVE monitor at Jarbidge th at is designated “JARB1.” To measure progress in deciviews, current visibility conditions ( 2008-2012) are compared to baseline conditions (2000-2004), and to projected conditions at th e end of the planning period (2018). A state establishes two RPGs for each of its Class I areas: one for the 20 percent best days and one for the 20 percent worst days. The RPGs must provide for an improvement in visibility on the 20 percent worst days and ensure no degradation in visibility on the 20 percent best days, compared to average visibility conditions during the base line period. In establishing the RPG, a state must consider the uniform rate of improvement in visi bility (from the baseline to natural conditions in 2064) and the emission reductions measures needed to achieve it. Nevada set the RPGs for Jarbidge using atmospheric air quality modeli ng based on projected emission reductions from control strategies in the Nevada Regional Haze SIP as well as emission reductions expected to result from other Federal, stat e and local air quality programs , among other factors. The purpose of a progress report is to assess whether a state’s plan is ad equate to achieve the established RPGs and emissions reductions goals for 2018, and if not, whether addition al emission reduction strategies are needed. Relevant Class I Areas: Nevada’s one Class I area, the Jarbidge Wilderness Area, is located within the Humboldt National Forest in the northeastern corner of the State within the populated Snake River Basin and less than 10 m iles from the Idaho border. The baseline visibility conditions (2000-2004) at Jarbidge are 12.07 deciviews (dv) on the worst days and 2.56 dv on the best days. The RPG for the worst da ys in 2018 at Jarbidge is 11.05 dv, which is slightly under, and therefore be tter than, the uniform rate of progress (URP) in 2018, which isThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 11 of 45 11.09 dv. 16 While a subsequent correction for the wo rst days in 2018 resulted in projected visibility impairment of 11.8 dv on the worst days, 17 NDEP has retained the RPG of 11.05 dv for Jarbidge. The RPG for the best days in 2018 at Jarbidge is 2.50 dv, whic h represents a slight improvement from baseline conditions. The Pr ogress Report addresses whether Nevada’s RH SIP is making adequate progress from the baseline toward these RPGs. The Nevada Regional Haze SIP identified 24 other Class I areas located in five neighboring states that are potential ly affected by emissions of sulfates and nitrates from sources
in Nevada. 18 Based on projections from air quality modeling for 2018, the highest contribution to sulfate extinction on the worst days from Nevada’s emissi ons is 5.6 percent at Zion National Park in Utah, and on the best days is 7.2 percent at Sawtooth Wilderness Area in Idaho. For nitrate extinction in 201 8, Nevada’s highest contribution on the worst days is 20 percent at Desolation Wilderness in California, and on the be st days is 12.4 percent at Joshua Tree National
Park in California. 19 The remaining 20 Class I areas outside Nevada are projected to have smaller fractions of haze attributable to Nevada’s emissions.
Data Sources: Nevada’s Progress Report is based on information available prior to March 2014. For the most part, NDEP relies on tec hnical data and analysis in two reports from the Western Regional Air Partnership (WRAP), the regional planning organi zation that provides technical support to western states. The WRAP’s reports are based on monitoring data from the

16 The URP is a straight line from the baseline visibility condition (5-year annual average from 2000-2004) to the estimated natural background condition in 2064, as measured on the 20 percent best and worst days. The URP values for 2018 are the number of deciviews where the lines drawn to 2064 for best and worst days intersect 2018. 17 See 76 FR 36464, June 22, 2011, footnote 18 (“In April 2011, the WRAP issued a draft report regarding an error in its visibility projections for about 15 Class I areas in th e West, including Jarbidge. The draft report indicated that, as a result of the error, the projected visibility at Jarbidge in 2018 is 11.8 dv instead of 11.1 dv (rounded up from 11.05 dv).”). 18 Nevada Regional Haze State Implementation Plan, Chapter 4.3.3, October 2009. Light extinction is based on a model known as Particulate Matter So urce Attribution Tracking (PSAT). 19 76 FR 36459, June 22, 2011.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 12 of 45 IMPROVE network and emissions data from EP A’s National Emissions Inventory (NEI). The first report is the “Western Regional Air Pa rtnership Regional Haze Rule Reasonable Progress Summary Report,” dated June 28, 2013, which incl udes Section 6.8 Nevada (Appendix A of the Progress Report). This report is based on the time period 2005-2009 and relies on the NEI from 2008. The WRAP updated the inventory before comp leting a second report titled “West-Wide Jump-Start Air Quality Modeling Study—Final Report” dated September 30, 2013. NDEP also uses NEI data from 2011, State emission inventor y data for 2012, acid rain data from EPA’s Air Market Program Database, and IMPROVE mon itoring data from 2008 to 2012 to provide more current information and additional analysis. NDEP further relies on the WRAP’s Technical Support System and the Visibility Information Exchange Web System as analytic tools.
V. EPA’s Evaluation of Nevada’s Progress Report This section describes Nevada’s Progress Re port and EPA’s evaluation of the Report in relation to the seven elements listed in 40 CFR 51.308(g), the determination of adequacy in 40 CFR 51.308(h), the requirement for state and FLM coordination in 40 CFR 51.308(i) and the requirements for public participation in CAA section 110(a) and (l) and 40 CFR 51.102. While the Progress Report focuses on the elements of th e Nevada Regional Haze SIP, the requirements in 40 CFR 51.308(g) and (h) apply to "implement ation plans," which are defined to include approved SIPs and FIPs. 20 Accordingly, EPA has considered our regional haze BART FIP for Reid Gardner as well as the Nevada Regiona l Haze SIP in assessing the Progress Report. However, as described further below, all three of the BART-eligible units at Reid Gardner have

20 40 CFR 51.302.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 13 of 45 been shut down. Therefore, the partial disapproval a nd partial FIP for Reid Gardner does not substantively influence our eval uation of the Progress Report. A. Status of Implementation of All Measures

1. NDEP’s Analysis The Progress Report describes the status of state and federal measures in the Nevada Regional Haze SIP as well as new programs, rule s, and legislation that will provide further emission reductions before the first phase of the regional haze program ends in 2018. Nevada’s measures to control or otherwise reduce emissions that contribute to h aze are organized into three broad categories: Review of BART Determinations, State Measures Other than BART, and Federal Programs. 21 The status of measures in each of these categories is summarized below. BART Implementation: NDEP describes BART implementation in Nevada and in neighboring states that contribute to visibility impairment at Ja rbidge. The four BART facilities in Nevada are Reid Gardner, Tracy Generati ng Station (Tracy), Fort Churchill Generating Station (Fort Churchill), and Mohave Genera ting Station (Mohave). Mohave closed in 2005. 22 The Nevada Regional Haze SIP requires the remaini ng three facilities to meet the emission limits associated with all BART control measures by January 1, 2015, with the exception of NO X at Reid Gardner, which has a compliance date of June 30, 2016, as shown in Table 1. As noted in the table, three units at Reid Gardner and two units at Tracy we re scheduled to retire by the compliance date. Subsequent to NDEP’s submittal of the Progress Report, all five of these units

21 Progress Report, Chapter Two, Status of Implementation of Control Measures, pages 2-1 thru 2-13. 22 Even though Mohave’s closure in 2005 predates the first phase of the RH program (2008-2018), NDEP addresses Mohave’s emissions in its Progress Report because thes e emissions are included in the inventories and modeling that form the basis for the Nevada Regional Haze SIP. For example, the projected emission inventory for 2018 includes about 19,595 tpy of NO X and 8,701 tpy of SO 2 from Mohave.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 14 of 45 were shut down and are now in the pro cess of being decommissioned and demolished. 23 The retirement of these five units, and the switching of thr ee other units at Tracy and Fort Churchill to natural gas, is largely in response to the passage of Senate Bill (SB) 123 by the Nevada legislature in 2013, which is described in more de tail in the next secti on regarding other State

measures. T ABLE 1—S TATUS O F B ART C ONTROL M EASURES Facility Units BART Control Measures
Reid Gardner Generating Station 1, 2, 3 NV Energy retired these thr ee units as of December 31, 2014, as approved by the Public Util ities Commission of Nevada (PUCN) Tracy Generating Station 1, 2 NV Energy retired these two units as of December 31, 2014, as approved by the PUCN and in response to SB 123. 3 NV Energy is relying on altern ative control technology and burning only natural gas to comply with the BART emissions limits as of the December 31, 2014, compliance date. Fort Churchill Generating Station 1, 2 NV Energy is relying on alte rnative control technology and burning only natural gas to comply with the BART emissions limits as of the December 31, 2014, compliance date. Mohave Generating Station All This facility ceased opera tions in December 2005 and was subsequently fully decommissioned and demolished.
NDEP explains in the Progress Report that BART implementation in neighboring states is expected to contribute to visi bility improvement at Jarbidge, which is located very near the Idaho border and downwind from sources in Oregon. Since source apportionment modeling identified substantial contribu tions of sulfur dioxide (SO 2 ) from point sources in Idaho and Oregon, 24 NDEP provides updates on two facilities in Idaho (Amalgamated Sugar Company in Nampa and Monsanto/P4 Production in Soda Spri ngs) and one facility in Oregon (Boardman

23 See Reid Gardner Generating Station Fact Sheet fr om Nevada Energy (May 2015), Frank A. Tracy Generating Station Fact Sheet from Nevada Energy (June 2015).

24 Nevada Regional Haze SIP, Section 4.3, November 2009.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 15 of 45 Power Plant) that are subject to BART control measures. Each of thes e three facilities is reportedly in compliance with the required BART emission limits for SO 2 and NO X . However, since some of the compliance dates are not yet e ffective, more emission reductions are expected by 2018. Other State Measures: Other State measures contribu ting to reasonable progress at Jarbidge and other Class I areas include cancellations of applicatio ns to build power plants, State legislation to reduce emissions from coal-fir ed power plants (i.e., SB 123), an expanded renewable energy portfolio, and implementation of control measures to attain the National Ambient Air Quality Standards (NAAQS) as liste d in Table 2. Regarding cancellations, NDEP explains that these measures represent addi tional emission reductions because the emissions from these unbuilt sources were included in the ba seline and projected emission inventories in the Nevada Regional Haze SIP. Of the five propos ed power plants that NDEP assumed would be producing emissions, three withdrew applicatio ns (White Pine, Toquop, and Copper Mountain), and two were built (Newmont TS Power Plan t near Dunphy in northern Nevada and Chuck Lenzie Generating Station near Las Vegas). 25 The Nevada Legislature in 2013 enacted SB 123 requiring the reduction of emissions from coal-fired power plants in Clark Count y, Nevada. SB 123 requires the retirement or elimination of not less than 800 megawatts of co al-fired electric gene rating capacity: 300 MW by December 2014, an additional 250 MW by Dece mber 2017, and an additional 250 MW by December 2019. This legislation also mandates th e construction or acquisition of 350 MW from new renewable energy facilities. NV Energy must c onstruct or acquire and own facilities with a

25 Newmont TS is a 220-megawatt power plant using coal-fired boilers with modern control technologies operating since 2008. Chuck Lenzie is 1,102-megawatt generating stat ion using gas-fired steam engines operating since 2006.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 16 of 45 total capacity of 550 MW to re place the coal-fired capacity eliminated between 2014 and 2019. 26 NV Energy’s decision to retire BART units at Reid Gardner and Tracy, and to convert other BART units to natural gas at Tracy and Fort C hurchill, was in response to this legislation. NDEP also reports that Nevada is one of th e first states to adopt a renewable portfolio standard that establishes a sche dule requiring electric utilities to generate, acquire, or save a percentage of electricity from renewable energy systems or efficiency measures. Not less than 20 percent must come from renewable energy or efficiency measures from 2015 to 2019. The Nevada legislature also has enacted the “S olar Energy Systems Incentive Program,” which requires the Public Utilities Comm ission of Nevada to set incentiv es and schedules to produce at least 250 MW of capacity from solar energy by 2021. At the time of the Progress Report, Nevada had installed 38 MW of capacity at a cost of $160 million. Another example of renewable energy is the “Solar Thermal Demonstrations Program” that promotes the installation of at least 3,000 solar thermal systems in homes, businesses, sc hools, and government buildings throughout the State. The Progress Report mentions several other programs to establish solar, wind, and waterpower energy systems along wi th a list of proposed genera tion plants that will rely on renewable energy. 27
T ABLE 2—S TATUS O F O THER S TATE M EASURES State Measure Effective Date Three Power Plants included in Inventory for 2018 Never Built Legislation to Retire Coal-F ired Plants (800 mw) 2014 – 2019 Legislation for New Renewable Energy (350 mw) 2014 – 2021 Renewable Energy Portfolio 2015 – 2025 NAAQS Attainment/Mainten ance Regulations Ongoing

26 Public Utilities Commission of Nevada, Docket No. 14-05003, May 1, 2014, (Appendix C). 27 Progress Report, Chapter 2, pages 2-8 thru 2-9.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 17 of 45 Federal Measures: The Progress Report provides a summary of existing federal measures, those that were included in the Ne vada Regional Haze SIP, as well as new federal measures as listed in Table 3. NDEP describes in the Report how each of these federal programs, rules, and standards contribute further re ductions in visibility impairing pollutants. 28 All eight areas in Nevada that were de signated non-attainment for one mo re NAAQS either have been redesignated to attainment and are operating under a maintenance plan or have a determination of attainment indicating that the area is at taining the NAAQS. The control measures for attainment that remain in place include fugitiv e dust regulations, oxygenated fuel programs, gasoline vapor recovery, transp ortation control measures, resi dential wood burning regulations, woodstove replacement programs, and alternative fuel vehicle program.

28 Progress Report, Chapter 2, pages 2-3 thru 2-6.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 18 of 45 T ABLE 3—S TATUS O F F EDERAL M EASURES Existing Federal Measures Heavy Duty Highway Rule (PM, NO X , SO X ) Phased in 2006 - 2010 Tier 2 Vehicle and Gasoline Program (NO X , VOC) Effective in 2005 Non-Road Mobile Diesel Emissions Program (NO X , CO) Phased in 2004 - 2012 Maximum Achievable Control Tec hnology Program Ongoing Applicability New Federal Measures Mercury and Air Toxics Rule (Toxic Gases, SO 2 ) Final Rule in 2011 Revised NAAQS for Sulfur Di oxide Final Rule in 2010 Revised NAAQS for Nitrogen Di oxide Final Rule in 2010 Revised NAAQS for Fine Particul ate Matter Final Rule in 2012 North American Emission Control Areas (NO X , PM 2.5 , SO 2 ) Effective in 2012; 2015 Tier 3 Vehicle Emission and Fuel Standards Program (SO X ) Effective in 2017
PM = Particulate Matter VOC = Volatile Organic Compounds

2. EPA’s Evaluation EPA proposes to find that NDEP adequately addresses the requirement in 40 CFR 51.308(g)(1) to describe the status of all measur es included in the Neva da Regional Haze SIP. NDEP provides a detailed and comprehensive upda te of state and federal measures, including new measures that are expected to contribute further to visibility improvement. The Progress Report’s description of BART implementation, legislation, programs, and rules provides a thorough summary of the regulat ory requirements that underpi n Nevada’s regional haze
program.
B. Summary of Emissi on Reductions Achieved

1. NDEP’s Analysis The Progress Report focuses on SO 2 and NO X emissions, which are the primary pollutants of concern from anthropog enic sources. NDEP reports that SO 2 and NO X emissions have decreased substantially in Nevada due to the implementation of control measures as well asThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 19 of 45 other changes in State energy policy and source ac tivity as described above in the status of measures. According to EPA’s acid rain data, 29 annual SO 2 emissions from Electricity Generating Units (EGUs) in Nevada decreased by 44,107 tpy (82 percent) from 53,346 tpy in 2005 to 9,239 tpy in 2006. Similarly, NO X emissions from power plants decreased by 23,257 tpy (54 percent) from 43,242 tpy in 2005 to 19,985 tp y in 2006. NDEP points out that while these large decreases from 2005 to 2006 are mostly due to the closure of Mohave Generating Station, emissions continued to decrease steadily th ereafter. From 2006 to 2013, power plant emissions of SO 2 decreased by about 20 percent (9,239 to 7,427 tpy) and NO X emissions decreased by about 61 percent (19,985 to 7,796 tpy). 30 The closure of units at Re id Gardner and Tracy, and the implementation of control measures on other units at Tracy and Fort Churchill, should contribute further emission reductions not reflec ted in the acid rain data for 2013. The Progress Report also quantifies emission reductions resulting from the cancellation of plans to construct th ree power plants and lower actual emissions from the two plants that were built. NDEP includes this analysis because projected emissions from these five sources are included in the emission inventory for 2018 that pr ovides the basis for the RPG at Jarbidge. The reductions due to permit can cellations are 5,814 tpy of SO 2 , 6,136 tpy of NO X , and 5,814 tpy of particulate matter (PM 10 ). Moreover, the two new plants that were built (Newmont and Chuck Lenzie) have combined actual emissions in 2012 that are less than projected for the emission inventory in 2018. 31 NDEP states that these unrealized emissi ons, in effect, would result in lower modeled visibility impairment in 2018, particularly at Class I ar eas near southern and eastern

29 USEPA Clean Air Markets Division, Air Ma rkets Program Data, Acid Rain Program. 30 Progress Report, Chapter 3, Table 3-2, page 3-5. 31 Progress Report, Chapter 3, Table 3-1, page 3-4.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 20 of 45 Nevada where the two built sources are located and the three cancelled sources had planned to locate.

2. EPA’s Evaluation EPA proposes to find that NDEP adequately addresses the requirement in 40 CFR 51.308(g)(2) to provide a summary of the emission reductions from implementing the measures in the Nevada Regional Haze SIP. NDEP documents that SO 2 and NO X emissions from Nevada’s power plants have decreased substantia lly, especially due to the closure of Mohave. NDEP makes the case that emissions from the power sector should continue to decline as BART controls and SB 123 are implemented, further reduc ing emissions from Reid Gardner, Tracy, and Fort Churchill. While it is difficult to quantify emission reductions from other state and federal programs, we agree that other state and fede ral measures should contribute to declining emissions, particularly from mob ile and stationary sources. While the cancellation of proposed facilities does not consti tute emission reductions per se, we recognize that the in clusion of these projected emissions in the 2018 in ventory likely inflated the proj ected emissions used as the basis of the RPGs for Jarbidge and Class I areas affected by Nevada’s em issions. We also note that NDEP’s summary of emission reductions is co mplemented by its analysis of recent changes in emissions from all sources in Section D of this proposal.
C. Assessment of Visibility Conditions and Changes at Jarbidge 1. NDEP’s Analysis Current Visibility Conditions: NDEP reports on current visibility conditions for the 20 percent worst days and 20 percent best days at Jarbidge for the five-years from 2008 to 2012 asThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 21 of 45 displayed in Table 4. 32 The five-year annual average haze inde x at Jarbidge for this current time period is 12.0 dv on worst days and 1.9 dv on best days. On worst days, the annual averages for visibility impairment are strongl y influenced by light extinction due to particulate organic matter (POM), followed by coarse mass and sulfate. On the best days, visibility impairment is dominated by light extinction due to sulfate, followed by POM and coarse mass. The Progress Report notes that sources of POM are predominan tly natural, while sources of fine soil and coarse mass are about equally sp lit between natural and anthr opogenic. The dominant source of sulfate is SO 2 from anthropogenic sources.
T ABLE 4—C URRENT A NNUAL AND F IVE -Y EAR A NNUAL A VERAGE V ISIBILITY C ONDITIONS FOR W ORST AND B EST D AYS AT J ARBIDGE 33
Year Haze Index

(dv) Sulfate (Mm -1 ) Nitrate (Mm -1 ) POM (Mm -1 ) EC (Mm -1 ) Soil (Mm -1 ) Coarse Mass (Mm -1 ) Sea Salt (Mm -1 ) Worst Days 2008 12.5 3.72 1.12 12.06 1.48 2.61 4.84 0.04 2009 11.1 4.43 0.53 7.32 1.12 2.31 5.66 0.30 2010 10.0 3.30 1.04 4.33 0.77 2.49 5.66 0.06 2011 11.7 4.16 0.67 7.71 1.21 2.49 6.85 0.40 2012 14.9 3.87 1.18 23.97 3.11 2.63 5.17 0.21 Average 12.0 3.9 0.9 11.1 1.5 2.5 5.6 0.2 Best Days 2008 1.9 1.14 0.22 0.23 0.09 0.12 0.27 0.05 2009 1.8 0.95 0.16 0.31 0.11 0.12 0.28 0.03 2010 1.8 1.09 0.15 0.30 0.12 0.06 0.24 0.03 2011 2.1 1.21 0.19 0.39 0.13 0.10 0.26 0.07 2012 2.0 0.95 0.18 0.37 0.18 0.10 0.37 0.04 Average 1.9 1.1 0.2 0.3 0.1 0.1 0.3 0.0
EC = Elemental Carbon

32 Progress Report, Chapter 4, Table 4-1, page 4-3. 33 The data on visibility conditions is from the IMPROVE monitor at Jarb idge (JARB1) that measures light extinction in terms of inverse megameters (Mm -1 ) that are directly related to gaseous and aerosol concentrations. The haze index is measured in deciviews, which is a metr ic of haze proportional to the logarithm of the light extinction.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 22 of 45 Difference between Current and Baseline Visibility Conditions: NDEP presents the difference between the current five-year annual average (2008-2012) and the baseline five-year annual average (2000-2004) for Jarbidge, as displaye d in Table 5, which also includes successive five-year annual averages for the inte rvening time periods (2005-2009, 2006-2010, and 2007- 2011). 34 The differences calculated in the table are be tween the baseline and the current visibility condition represented by the time period 2008-20 12. A negative differenc e indicates a reduction in haze (i.e., improved visibility). Comparing baseline to current visibility conditions on worst days, the haze index declined slightly (12.1 to 12.0 dv) with correspondin g decreases in light extinction for sulfate, nitrate, and elemental car bon, but a noticeable increase in POM. On the best days, the haze index decreases from the baseli ne to current visibility conditions (2.6 to 1.9 dv) with corresponding decreases in light extinction for sulfate, nitrate, POM, and elemental carbon, with the three other pollutants remaining the same. NDEP also analyzes the relative percentage contribution and rank of each pollutant to visibility impairment on the worst and best days for the five-year annual average baseline and successive five-year time periods, as displayed in Table 5. 35 This analysis reveals that POM (ranging from 35.5 to 43.0 percent), coarse mass ( 21.9 to 26.1 percent), an d sulfate (15.1 to 17.0 percent) rank first, second, and third, respectivel y, as the largest contribu tors to light extinction on worst days in each of the five-year periods from the baseline to current time period. On the worst days, POM dominates the cont ributions to visibility impairme nt for the baseline as well as all subsequent time periods. The data for su lfate and nitrate show small but continued improvement on worst days based on these five-year annual averages.

34 See Progress Report, Chapter 4, Table 4-2, page 4-4. 35 Progress Report, Table 4-4, Percent Contribution to Aerosol Extinction by Species, page 4-10. These results excluded Rayleigh and are expressed as a percentage of Mm -1

.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 23 of 45 On the best days for each five-year period of annual averages, sulfate (ranging from 4.10 to 50.5 percent), POM (15.1 to 26.1 percent), and coarse mass (12.4 to13.2 percent) rank first, second, and third except for the base line period in which nitrate is third, contributi ng 9.8 percent. On average across all five-year periods, nitr ate and elemental carbon each contribute about 10 percent to visibility impairment on best days. NDE P explains that the sulfate contribution is most likely high because best days represent times when there are fewer emissions from natural sources, resulting in relatively higher contributio n to impairment from anthropogenic emissions. Although the ranking changes from worst days to be st days, POM, coarse mass, and sulfate are the three largest contributors to visibility impairment at Jarbidge.
T ABLE 5—B ASELINE AND F IVE -Y EAR A NNUAL A VERAGE V ISIBILITY C ONDITIONS FOR THE W ORST AND B EST D AYS AT J ARBIDGE Time Period Haze Index

(dv) Sulfate (Mm -1 ) Nitrate (Mm -1 ) POM (Mm -1 ) EC (Mm -1 ) Soil (Mm -1 ) Coarse Mass (Mm -1 ) Sea Salt (Mm -1 ) Worst Days Baseline 12.1 4.0 1.1 10.0 1.6 2.4 5.5 0.1 2005-2009 12.4 4.4 1.4 10.0 1.7 2.6 5.9 0.2 2006-2010 12.2 4.0 1.1 9.6 1.6 2.7 6.1 0.1 2007-2011 11.7 3.9 1.0 8.4 1.2 2.7 6.2 0.2 2008-2012 12.0 3.9 0.9 11.1 1.5 2.5 5.6 0.2 Difference -0.1 -0.1 -0.2 1.1 -0.1 0.1 0.1 0.1 Best Days Baseline 2.6 1.2 0.3 0.8 0.3 0.1 0.3 0.0 2005-2009 2.2 1.1 0.2 0.5 0.2 0. 0.3 0.0 2006-2010 2.0 1.1 0.2 0.4 0.1 0.1 0.3 0.0 2007-2011 2.0 1.1 0.2 0.3 0.1 0.1 0.3 0.0 2008-2012 1.9 1.1 0.2 0.3 0.1 0.1 0.3 0.0 Difference -0.7 -0.1 -0.1 -0.5 -0.2 0.0 0.0 0.0
To support its analysis of current conditions, NDEP presents a set of rolling five-year averages of the annual averages, and includes th e current estimate of natural conditions, asThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 24 of 45 shown in Table 6. 36 The rolling five-year average of the a nnual averages reveals more clearly the trend in visibility conditions over time.

T ABLE 6—F IVE -Y EAR A NNUAL A VERAGE H AZE I NDEX FOR B ASELINE AND S UCCESSIVE T IME P ERIODS M EASURED AT JARB1 ( IN DECIVIEWS ) Days Measured (20 Percent) Baseline Conditions Interim Five-Year Time Periods Current Conditions Natural Conditions 2000-2004 2005-2009 2006-2010 2007-2011 2008-2012 2064 Worst 12.1 12.4 12.2 11.7 12.0 7.9 Best 2.6 2.2 2.0 2.0 1.9 1.1 NDEP also presents the change in visibility conditions between the baseline and current period for best and worst days in comparison to the RPG in 2018 using the 2008 to 2012 average as displayed in Table 7. 37 While visibility on the best days shows improvement, only modest progress is shown for the worst da ys due to significant contributi on of POM to light extinction at Jarbidge, particularly in 2012 as shown in Table 4.

T ABLE 7—R EASONABLE P ROGRESS G OAL S UMMARY FOR J ARBIDGE ( IN D ECIVIEWS ) Best Days Worst Days Baseline

(2000- 2004) Current (2008- 2012) VisibilityImprovement Baseline (2000- 2004) Current (2008- 2012) VisibilityImprovement 2018 RPG Progress in 2012 to 2018

RPG 2.6 1.9 0.7 12.1 12.0 0.1 11.05 9.5%

Changes in Visibility Impairment over Past Five Years: The distinguishing feature of annual visibility impairment on the worst days from 2008 to 2012 is the variability of light extinction due to POM and its corresponding effect on the haze index as shown in Table 4. While

36 Progress Report Table 4-3, page 4-6. 37 Progress Report Table 4-6, page 4-14. This table omits the RPG for the best days, which is 2.56 dv.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 25 of 45 light extinction for other pollutants is relativel y flat during this curre nt five-year period, POM varies by almost 20 Mm -1 , from a low of 4.33 Mm -1 in 2010 to a high of 23.97 Mm -1 in 2012. Levels of POM spiked in 2012, which NDEP attributes to emissions from wildfires. As the table shows, on the worst days POM has a strong influen ce on the year-to-year vari ability in visibility conditions, and can cause a corresponding increas e in the 2008-2012 five-year annual average. Visibility impairment on worst days generally ha s not changed much over the five years except for the variations due to light extinction from POM. Visibil ity on best days, by contrast, generally is improving over the current time period with little variability from year to year. For the best days, there is a noticeabl e reduction in visibility impairment due to sulfate, nitrate, POM, and elemental carbon. NDEP presents a trend analysis for the period from 2000 to 2012, focusing on sulfates and nitrates, as an annual average and as a rol ling five-year average duri ng this 13-year time period based on IMPROVE data. 38 Analyzing this longer time pe riod demonstrates that on the worst and best days visibility im pairment resulting from light exti nction due to sulfate and nitrate is improving over time, both on an annual basis as well as five-year annual averages. NDEP also includes an analysis showing th e effect of a large spike in nitrates in December 2005 (41 Mm -1 ) that increases the annual average as well as all the fi ve-year averages that include data from 2005.

2. EPA’s Evaluation EPA proposes to find that NDEP adequately addresses the requirement in 40 CFR 51.308(g)(3) to assess the visibility conditions an d changes in each of the State’s Class I areas

38 Nevada RH Progress Report, Chapter 4, Figures 4-12 through 4-15, pages 4-15 thru 4-19.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 26 of 45 for the least and most impaired days in term s of the current conditi ons, difference between current and baseline conditions, and over the past fi ve years. The analysis indicates that visibility on the best days at Jarbidge is getting better, but that visibility on the worst days is flat or only minimally improving. However, NDEP offers compe lling evidence that light extinction due to POM has dominated visibility conditions on the worst days, particularly in 2012 as shown in Table 4.
D. Analysis of Changes in Emissions

1. NDEP’s Analysis NDEP relies on the WRAP’s analysis 39 to describe the changes in emissions from the
baseline 40 in 2002 to the emissions inventory in 20 08, the beginning of Nevada’s current fiveyear time period. NDEP also uses NEI data from 2008 to 2011 to augment its analysis. 41 As shown in Table 8, emissions of all visibility-impairing pollutant s decreased from the baseline inventory to 2008, except for fine soil and coar se mass. Notably, actual emissions in 2008 are lower than the projected 2018 emissions for all po llutants, with the exception of fine soil and coarse mass. For example, point source emissions of SO 2 decreased by 78 percent, while point source emissions of NO X decreased by over 50 percent from the baseline to 2008. These large reductions in the anthropogenic emissions of SO 2 and NO X represent a successful strategy of reducing anthropogenic emissions within the State. NDEP notes that the increase in fine soil and coarse mass are likely due to updates in invent ory development methods rather than actual

39 WRAP Regional Haze Rule Reas onable Progress Summary Report , June 28, 2013. West-Wide Jump-Start Air Quality Modeling Study—Final Report , September 30, 2013. 40 WRAP refers to the baseline as 2002, the midyear of the baseline inventory period from 2000 to 2004. 41 Data from the NEI are slightly different from the WestJump2008 inventory, which leverages more recent inventory development performed by the WRAP.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 27 of 45 increases, which is plausible given the small ch anges in soil and coarse mass observed at the Jarbridge monitor.
T ABLE 8—C OMPARISON OF E MISSION I NVENTORIES IN 2002, 2008, AND 2018 FOR N EVADA OF A LL V ISIBILITY I MPAIRING P OLLUTANTS 42
Pollutants 2002 Baseline (tpy) 2008 Inventory (tpy) 2018 Projection (tpy) 2008 Actuals as a Percent of 2018 Projections Sulfur Dioxide 67,743 17,058 46,224 37% Nitrogen Oxides 162,397 119,513 135,496 88% Ammonia 12,092 9,382 14,503 65% Volatile Organic Compounds 897,102 351,142 897,707 39% Primary Organic Aerosol 24,734 11,816 24,822 48%
Elemental Carbon 6,409 4,425 5,638 78% Fine Soil 21,208 40,301 24,134 167% Coarse Mass 161,142 321,257 188,287 171% NDEP analyzes the differences between th e baseline and curren t emissions based on WRAP’s WestJump2008 inve ntory for eight categories of emi ssions as summarized below. This analysis focuses on the percentage change in th e emissions of each pollutant by source category in 2002 and 2008, and adds an analysis of changes in emissions from 2008 to 2011 where NEI data is available. Sulfur Dioxide: Total anthropogenic emissions of SO 2 decreased by 75 percent from 65,543 tons in 2002 to 16,552 tons in 2008, represen ting a significant reduction in particular from point and area sources as shown in Table 9. Point source emissions alone decreased by 78 percent (50,720 to 11,067 tpy) dur ing this period, and area so urce emissions decreased by 63 percent (12,953 to 4,863 tpy). As a percentage of total statewide emissions, anthropogenic and

42 The WRAP compared data between the baseline (2002) and emission inventory (2008) for nine source categories: point sources, area sources, oil and gas, on-road mobile, off-road mobile, fugitive dust and road dust, windblown dust, biogenic, and fires.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 28 of 45 natural, point source emissions decreased from 75 percent of the tota l in the 2002 (50,720 of 67,743 tons) to 65 percent of the total in the 2008 (11,067 tons of a total 16,552 tons). Moreover, the NEI inventories show a further decrease in SO 2 emissions from point sources of 44 percent from 10,409 tpy in 2008 to 5,863 tpy in 2011, primarily due to reductions in coal-fired emissions from power plants. On-road and off-road mob ile emissions decreased by 34 percent (454 to 298 tpy) and 77 percent (1,403 to 322 tpy), respec tively, from 2002 to 2008. Data from the NEI indicate further reductions in emissions from mobile sources from 2008 to 2011, a 47 percent decrease in on-road emissions (511 to 270 tpy) and a 87 percent decrease in off-road emissions (316 to 41 tpy).
T ABLE 9—C HANGES IN S ULFUR D IOXIDE E MISSIONS BY C ATEGORY (TPY) Source Category 2002 (Baseline) 2008 (WestJump2008) Difference (Percent Change) Anthropogenic Sources Point 50,720 11,067 -39,653 (-78%) Area 12,953 4,863 -8,090 (-62%) On-Road Mobile 454 298 -156 (-34%) Off-Road Mobile 1,403 322 -1,081 (-77%) Area Oil and Gas 0 0 0 Fugitive and Road Dust 0 0 0 Anthropogenic Fire 12 2 -10 (-83%) Total Anthropogenic 65,543 16,552 -48,991 (-75%) Natural Sources Natural Fire 2,200 506 -1,694 (-77%) Biogenic 0 0 0 Windblown Dust 0 0 0 Total Natural 2,200 506 -1,694 (-77%) All Sources Total Emissions 67,743 17,058 -50,685 (-75%)

Nitrogen Oxides: The total statewide inventory of NO X emissions from all sources decreased by 26 percent from 162,397 tpy in 20 02 to 118,766 tpy in 2008 as shown in Table 10. Over this time period, NO X emissions from anthropogenic sources decreased by 23 percentThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 29 of 45 (139,353 tpy to 107,827 tpy), and natural emissions decreased by 53 percent (23,044 tpy to 10,939 tpy). Anthropogenic emissions of NO X in Nevada are primarily from point and on-road mobile sources, followed by off-road and area sources. From the 2002 to 2008 inventories, NO X emissions from point sources decreased by about 50 percent (59,864 to 29,344 tpy), on-road mobile increased by about 22 percent (41,089 to 50,068 tpy), off-road mobile decreased by about 48 percent (32,565 to 17,081 tpy), and area sour ces increased by 98 percent (5,725 to 11,321 tpy). Increases in on-road mobile and area sour ce emission inventories were offset by larger decreases in emissions from point and off-road mobile sources. The NEI point source inventory shows a decrease of 57 percent in NO X emissions from 2008 to 2011. NDEP attributes the 22 percent increase in on-road mobile emissions to the use of different air quality models to estimate emissions in 2002 (MOBILE6) and in 2008 (MOVES2010), a growth in the number of vehicles, and the fact that fede ral vehicle emissions standards were not fully implemented. NEI data from 2008 and 2011 show a 36 percent increase in on-road mobile NO X emissions, possibly related to population growth. The NEI shows a c ontinuing decrease in off-road mobile emissions of 12 percent from 2008 to 2012. NDEP states that th e increase in emissions from area sources may be a result of a reclassification of some of f-road mobile sources into area source category, which may have contributed to the decrease in em issions from off-road mobile sources. This is consistent with the reclassifi cation of in-flight aircraft em issions and locomotive emissions outside of rail yards from the off-road mobile category to the area source category in the 2008
NEI. 43
T ABLE 10—C HANGES IN N ITROGEN O XIDE E MISSIONS BY C ATEGORY (TPY) Source Category 2002 2008 Difference

43 See http://www.epa.gov/ttnchie1/net/2008inventory.html (“Description of NEI Data Categories”)This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 30 of 45 (Baseline) (WestJump2008) (Percent Change) Anthropogenic Sources Point 59,864 29,344 -30,520 Area 5,725 11,321 5,597 On-Road Mobile 41,089 50,068 8,979 Off-Road Mobile 32,565 17,081 -15,484 Area Oil and Gas 63 0 -63 Fugitive and Road Dust 0 0 0 Anthropogenic Fire 48 13 -35 Total Anthropogenic 139,353 107,827 -31,526 (-23%) Natural Sources Natural Fire 8,026 3,575 -4,451 Biogenic 15,018 7,364 -7,654 Windblown Dust 0 0 0 Total Natural 23,044 10,939 -12,105 (-53%) All Sources Total Emissions 162,397 118,766 -43,631 (-26%)

Ammonia: Total statewide emissions of amm onia decreased by 22 percent (12,092 to 9,382 tpy) from 2002 to 2008. Of this total, anth ropogenic emissions decreased by 34 percent (10,408 to 6,893 tpy) while natural emissions in creased by 48 percent (1,684 to 2,490 tpy). The primary source of anthropogenic emissions of amm onia is area sources, a nd to a lesser extent onroad mobile sources, while fire is the dominant natural source. 44 Area sources of ammonia emissions decreased by about 29 percent (8,009 to 5,717 tpy) from 2002 to 2008. On-road mobile sources, the next larg est category of anthropogenic em issions, decreased by about 58 percent (2,030 to 849 tpy). Despite an increase of 48 percent in natural fire (1,684 to 2,490 tpy), there was a net decrease in stat ewide emissions. Ammonia is not a criteria polluta nt and is not included in the NEI, so no data for 2011 were provided.

44 The WRAP has created an operational policy level defi nition of fire activity as discretely natural or anthropogenic. See the WRAP Regional Haze Rule Reasonable Progress Summary Report , section 3.2.1 and the WRAP’s Policy for Categorizing Fire Emissions (November 15, 2001), available at http://www.wrapair.org/forums/fejf /documents/nbtt/FirePolicy.pdf.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 31 of 45 Volatile Organic Compounds: Data from the 2002 and 2008 inventories as well as from the NEI for the 2008 to 2011 time period show la rge reductions in volatile organic compounds (VOC) emissions from natural sources with lesser reductions from anthropogenic sources. Biogenic emissions from natural sources dominat e the Nevada VOC emissions inventory. Total statewide VOC emissions decreased by 61 perc ent from 897,102 tpy in 2002 to 351,142 tpy in 2008. This large reduction is mostly due to a de crease in biogenic emissions over this time period by 67 percent from 794,139 tpy to 262,912 tpy. NDEP notes that these changes may reflect enhancements to the inventory method, use of different meteor ological years, and improved emission factors and data sources. Ther e were also decreases in on-road mobile (36,257 to 21,302 tpy) and natural fire (17,606 to 4,204 tpy), and an increas e in area sources (28,592 to 40,973 tpy), all of which are a very sma ll part of the total inventory. VOC emissions in the NEI show a decrease in point source (17 percent), on-road mobile (20 percent), and off road mobile (18 percent) from 2008 to 2011. Primary Organic Aerosol: Wildfires are the dominant s ource of primary organic aerosol (POA) emissions, 90 percent of the total in 2002 (22,501 of a total 24,734 t py) and 58 percent in 2008 (6,831 of a total 11,816 tpy). Anthropogenic s ources, namely area and mobile, also are important contributors. Overall, total emissions of POA decreased by 52 percent from 2002 to 2008. Natural fire emissions of POA decreased 70 percent (22,501 to 6,831 tpy), reflecting the high variability of wildfires from year to year. Except for anthropogenic fire, all other categories of anthropogenic sources of POA (primarily area , mobile, and fugitive) increased during this time period with the total an thropogenic emissions increasi ng by 123 percent from 2,233 to 4,985 tpy.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 32 of 45 Elemental Carbon: Natural fire (i.e., wildfires) also dominate EC emissions at 73 percent of the 2002 inventory (4,674 of 6,409 tpy), but on ly 23 percent of the 2008 inventory (1,130 to 4,425 tpy), a reduction of 76 percent (4,674 to 1,130 tpy). Consequently, total emissions decreased by 31 percent (6,409 to 4,425 tpy) mostly due to the decrease in natural fire. Total anthropogenic emissions increased by 90 percent ( 1,735 to 3,295 tpy) due mostly to an increase in on-road mobile sources from 235 to 1,891 tp y over this time period. On-road mobile is the largest source of elemental ca rbon in the 2008 inventory at 43 pe rcent, while the next largest category is natural fire emissions contributing 26 percent. Area a nd point sources, by contrast, contribute less than one percen t each to the 2008 inventory. Fine Soil: Total emissions of fine soils increased by 90 percent (21,208 to 40,301 tpy) from the 2002 to the 2008 inventory. The largest increases were in fugitive dust (6,128 to 19,216 tpy) and windblown dust (10,438 to 17,051 tpy). NDEP reports that increases in these source categories were likely due to updates to invent ory development methods rather than actual increases.
Coarse Mass: Total emissions of coarse mass in creased by about 99 percent (161,142 to 321,257 tpy), mostly due to large increases in anthropogenic fugitive and road dust (56,799 to 161,532 tpy) and in natural windblown dust ( 93,946 to 153,459 tpy). Fugitive dust includes sources such as agricultural operations, construction, and mini ng operations. Windblown dust is largely from vacant lands. NDEP attributes these increases in part to updates in the inventory development methods rather than actual increases . Nonetheless, increases in fugitive dust may be due to increases in population, while increases in road dust may be due to increases in vehicle miles traveled. Point source and na tural fire emissions decreased.

2. EPA’s EvaluationThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 33 of 45 We propose to find that NDEP adequately addresses the requirement in 40 CFR 51.308(g)(4) to analyze the change in emissions over the past five years of pollutants contributing to visibility impairment from all so urces and activities within the state, using the most recently updated emission inventories. NDEP’ s analysis of emission data makes a strong case that the State is reducing emissions of SO 2 and NO X from anthropogenic sources, especially point sources.
E. Assessment of Anthropogeni c Emissions Impeding Progress

1. NDEP’s Analysis NDEP reports that progress toward achieving its visibility goal of 11.05 dv at Jarbidge by 2018 has not been impeded by any significant anth ropogenic emission changes within or outside the State. NDEP reaches this conclusion by ev aluating significant emission changes within Nevada, the effect of emissions from sources ou tside of Nevada on Jarbid ge, and the effect of Nevada’s emissions on nearby Class I areas. Emission Changes within Nevada and Visi bility Conditions at Jarbidge: NDEP analyzes the baseline and rolling five-year annual averag es of light extinction data from the JARB1 monitor for the best and worst days from 2005 through 2012. For the worst days, the data show a reduction in sulfate and nitrate extinction for the three most re cent five-year periods (2006-2010, 2007-2011, and 2008-2012), but an increase in POM extinction, due to a spike in 2012 that
NDEP attributes to wildfires. 45 On the best days, visibility impairment is reduced from the baseline to the current period due to decreases in extinction fro m sulfate, nitrate, POM, and

45 Progress Report, Chapter 6, pages 6-2 thru 6-3.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 34 of 45 elemental carbon. Light extinction fo r soil, coarse mass, and sea salt remain fairly constant on best days.
Actual emissions of SO 2 , NO X , PM 10 , and VOC from point sources in Nevada 46 have decreased significantly over a 10-year period (2002-2012) and over the last five years (2008- 2012) as presented in Table 11. 47 The years 2002, 2005, 2008, and 2011 are the most complete inventory years submitted to EPA for the NEI. The data for 2012 are actual emission values for major and minor point sources from Nevada’s permitting database. As shown in the table, SO 2 emissions from point sources dropped dramatica lly after the closure of Mohave in 2005, and decreased by another 50 percent from 2008 to 2012. Likewise, NO X emissions decreased by 30,000 tpy after 2005, and decreased anot her 62 percent from 2008 to 2012.
T ABLE 11—A CTUAL E MISSIONS OF N EVADA P OINT S OURCES (TPY)
Year SO 2 NO X PM 10 VOC 2002 50,619 55,876 6,868 2,132 2005 54,243 52,087 4,643 1,646 2008 10,497 21,680 3,465 1,600 2011 5,959 10,548 3,331 971 2012 5,278 8,324 2,629 986
PM 10 = particulate matter less than 10 microns

Emissions from Outside Sour ces Effecting Jarbidge: NDEP’s analysis focuses on three BART sources in Idaho and Oregon to determin e whether these previous ly identified point sources are impeding progress on the worst days at Jarbidge. Comparing baseline emissions to the NEI in 2011, total SO 2 emissions from these three sources decrease by about 40 percent (26,243 to 15,782 tpy) from 2002 to 2011. Total NO X emissions decrease by about 31 percent

46 SO 2 emissions from point sources were 68 percent of the total anthropogenic emissions in Nevada in 2008 (WestJump2008). Area source emissions of SO 2 were 29 percent of total anthropogenic emissions in 2008. 47 Progress Report, Table 6-1, page 6-4.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 35 of 45 (11,010 to 7,611 tpy) over the same time period. Mo reover, emissions from these sources will continue to decline over time given staggere d compliance dates thr ough 2018. With visibility impairment resulting from sulfate and nitr ate trending downward at Jarbidge and the implementation of BART controls in Idaho and Oregon, NDEP concl udes that there are no significant changes in anthropogenic emissions from outside the State that are impeding progress at Jarbidge. In assessing point source emissions from Idaho and Oregon, NDEP references source apportionment modeling of particulate sulfate and nitrate extinction for 20 18 that was performed by the WRAP for the Nevada Regional Haze SIP. 48 The purpose of the modeling is to determine source areas that contribute to visibility impair ment on the worst days at Jarbidge. The area of greatest sulfate contribution is Outside Domain 49 (43.8 percent), followed by Idaho (10.3 percent), Oregon (7.2 percent), and Pacific Offshor e (6.9 percent). The area of greatest nitrate contribution is Idaho (30.3 percent), followed by Outside Domain (27.5 percent), Nevada (13.1 percent), and Utah (10.6 percent). Based on these results, Ida ho is the second largest contributor of modeled sulfate and the larges t contributor of mode led nitrate concentrations. Oregon is the third largest contributor of modele d sulfate concentrations. While th is analysis supports the focus on emissions from Idaho and Oregon, the fact th at Outside Domain contributes 43.8 percent of the modeled sulfate and 27.5 percent of the modeled nitrate is another indi cation that Nevada has limited control over a large subset of the em issions impairing visibility at Jarbidge.

48 Nevada Regional Haze SIP, Chapter 4, Table 4-5: Summary of 2018 Model Results for Jarbidge Wilderness Area, based on Particulate Matter Source Attribution Tracking, page 31. 49 Outside Domain as a source category represents the ba ckground concentrations of pollutants from international sources that enter the modeling domain, in this case the western United States and portions of Canada and Mexico.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 36 of 45 Nevada’s Emissions Effect on Nearby Class I Areas: NDEP also addresses the potential effect of Nevada’s emissions on nearby Class I areas in other states using particulate source apportionment modeling conducted by the WRAP fo r the first round of regional haze SIPs. This modeling estimated Nevada’s projected contribu tions to light extinc tion from sulfates and
nitrates at Class I areas in adjacent states in 2018. 50 In light of the 75 percent reduction in Nevada’s SO 2 emissions (see Table 9) a nd 26 percent reduction in NO X emissions (see Table 10) between 2002 and 2008, NDEP concludes that Neva da’s emission reductions are not impeding progress in reducing visibility impairment at Class I areas in adjacent states.

2. EPA’s Evaluation EPA proposes to find that NDEP adequately addresses the requirement in 40 CFR 51.308(g)(5) to assess any significant changes in anthropogenic emissions within or outside the state over the past five years that have limited or impeded pr ogress in reducing emissions and improving visibility. NDEP provides a comprehensiv e analysis of emission changes within and outside the State, and examines the potential effect of these ch anges at Jarbidge and at other Class I areas. All indications are that the total statewide emissions of SO 2 and NO X are decreasing (see Tables 9, 10, and 11), and most of the pollutants are already at levels below those in the projected emission inventory for 2018 (see Table 8). Based on NDEP’s analysis, EPA proposes to concur with NDEP that there is no evidence that any recent changes in emissions from any specific sources or source categories are impeding progress.
F. Assessment of Plan Elements and Strategy

50 Nevada Regional Haze SIP, Chapter 4, Tables 4-3: Nevada’s Sulfate Extinction Contribution to Class I Areas Outside of Nevada and Table 4-4: Nevada’s Nitrate Extinction Contribution to Class I Areas Outside of Nevada, pages 14-17.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 37 of 45 1. NDEP’s Analysis The Progress Report concludes that the existi ng elements and strategies in the Nevada Regional Haze Implementation Plan are sufficient to enable Nevada and ot her neighboring states to meet the RPGs by 2018 in terms of reducing emissions from anthropogenic sources. Nevada has already achieved significant emission reducti ons in the first phase of the regional haze program, with additional reductions expected by 2 018. Actual emissions of visibility impairing pollutants in 2008, with the excepti on of fine soil and coarse ma ss, are already less than the projected emissions in 2018 (see Table 8). Notably actual SO 2 emissions in 2008 are about 40 percent and actual NO X emissions are about 90 percent of th e respective totals in the projected emission inventory for 2018. The NEI data for 2008 and 2011 also demonstrate further reductions in SO 2 and NO X emissions from point sources in Nevada (see Table 11). Moreover, further reductions in anthropogeni c emissions are expected from th e power sector as a result of BART implementation, shutdowns, and conversions to natural gas or lower sulfur fuels. In the case of Jarbidge, NDEP notes that emissions fr om natural sources can dominate visibility impairment on the worst days, and much of the anthropogenic emissions are from out-of-state. NDEP states that given the current and expected SO 2 and NO X emission reductions from power plants, further reductions from any other non-utility or industrial point sour ces are unnecessary at this time. Regarding visibility conditions, trend analysis of monitoring data at Jarbidge from 2000 to 2012 demonstrates improvement in visibility impairment from sulfate and nitrate on the worst and best days, both on an annual average ba sis as well as five-year annual averages. 51 NDEP notes that, although the visibility benefit from anthropogenic emission reductions is

51 Progress Report, Chapter 4, Section 4.6: Visibility Trends, pages 4-15 thru 4-19.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 38 of 45 overshadowed by contributions from natural sources , visibility is slowly improving at Jarbidge on the worst days and shows considerable improve ment on the best days (see Tables 5, 6, and 7). Where it appears that visibility improvement on worst days is not keeping pace with emission reductions (e.g., the 14.9 dv annual average for 2012 in Table 4), NDEP asserts that this is due to large contributions from natural sources (e.g., light extinction from POM of 23.97 Mm -1 in 2012). In terms of anthropogenic sources, NDEP not es that sulfate cont ributes the most to visibility impairment on worst days at Jarbidge , but most of the sulfate is from out-of-state sources. Nitrate has only a sma ll contribution to visibility impairment on the worst days.

2. EPA’s Evaluation EPA proposes to find that the Progress Report adequately addresses the requirement in 40 CFR 51.308(g)(6) to assess whether the current el ements and strategies in the Regional Haze Implementation Plan are sufficient to enable Ne vada, and other states affected by Nevada’s emissions, to meet all established RPGs. In particular, the Report analyzes trends in statewide emissions and visibility conditions at Jarbidge, as well as the additional emissi on reductions expected through 2018. The Report indicates that anthr opogenic emissions of SO 2 , NO X , ammonia and VOC are decreasing. In particular, the emission reductions reflect substa ntial decreases in tota l anthropogenic emissions of SO 2 and NO X . However, anthropogenic emissions of POA, fine soil, elemental carbon and coarse mass are increasing. While these increases may be partially attributable to changes in inventory development methodologies, they highli ght the need for greater attention to these pollutants in future planning periods. With regard to visibility trends, the Progress Report explains that Ja rbidge is not on track to meet the 2018 RPG for the worst days due to the large contribution from POM, which NDEPThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 39 of 45 attributes mostly to wildfires and windblown dus t. EPA concurs that POM has a large impact on the worst days and that much of the POM is attribut able to natural sources, particularly wildfires. Furthermore, we note that the trend of high POM extinction (with si gnificant interannual variability) dominating the worst days at Ja rbidge has continued during 2013 and 2014, for which the IMPROVE data are now available, as shown in Tables 12 and 13.
T ABLE 12

- 2013 AND 2014 A VERAGE V ISIBILITY C ONDITIONS FOR W ORST AND B EST D AYS AT J ARBIDGE Year Haze Index

(dv) Sulfate (Mm -1 ) Nitrate (Mm -1 ) POM (Mm -1 ) EC (Mm -1 ) Soil (Mm -1 ) Coarse Mass (Mm -1 ) Sea Salt (Mm -1 ) Worst Days 2013 11.7 3.5 1.0 8.4 1.3 2.7 5.9 0.1 2014 12.2 3.1 0.6 14.5 2.3 2.2 4.5 0.2 Best Days 2013 1.5 0.9 0.1 0.2 0.0 0.1 0.2 0.0 2014 1.8 1.0 0.2 0.3 0.1 0.1 0.2 0.1
T ABLE 13

- F IVE -Y EAR A NNUAL A VERAGE V ISIBILITY C ONDITIONS FOR W ORST AND B EST D AYS AT J ARBIDGE Year Haze Index

(dv) Sulfate (Mm -1 ) Nitrate (Mm -1 ) POM (Mm -1 ) EC (Mm -1 ) Soil (Mm -1 ) Coarse Mass (Mm -1 ) Sea Salt (Mm -1 ) Worst Days 2009-2013 12.0 3.8 0.9 10.7 1.5 2.5 5.9 0.2 2010-2014 12.2 3.6 0.9 12.1 1.8 2.5 5.6 0.2 Best Days 2009-2013 1.9 1.0 0.2 0.4 0.1 0.1 0.3 0.0 2010-2014 1.9 1.0 0.2 0.4 0.1 0.1 0.3 0.0

However, we also note that not all POM is from natural sources. POA and VOC, the precursors to POM, are also emitted by anthropo genic sources, particularly area and mobile sources. Moreover, other pollutants, particularly coarse mass and sulfates, both of which have a significant anthropogenic component , also contribute to impair ment on the worst days at Jarbidge. Accordingly, in developing its Region al Haze SIP for the next planning period, NDEPThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 40 of 45 should consider implementing additional control m easures to address anthropogenic emissions of POA, VOC, SO 2 , and coarse mass. Nonetheless, given the s ubstantial reductions in an thropogenic emissions of SO 2 and
NO X , improvement in visibility conditions on the be st days, and evidence that the worst days are slowly improving, we propose to find that the cu rrent plan is sufficient for meeting the RPGs.
G. Review of Visibil ity Monitoring Strategy 1. NDEP’s Analysis The primary monitoring network, nationally and in Nevada, for the measurement and characterization of pollutants contributing to regional haze is the IMPROVE network. NDEP intends to rely on the continued availability of quality assured data collected through the IMPROVE network to comply with the regional haze monitoring requirements in the RHR. NDEP finds that the IMPROVE site at Jarbidge, Nevada’s only Class I area, is sufficiently representative to support a determination of reasonable progress. NDEP concludes that no modification to the State’s vi sibility monitoring strategy is necessary at this time.

2. EPA’s Evaluation EPA proposes to find that NDEP adequately addresses the requirement in 40 CFR 51.308(g)(7) to review its visibility monitori ng strategy and make a ny modifications as necessary. We are not aware of any evidence of a need to modify Nevada’s monitoring strategy for measuring visibility at this time.
H. Determination of Adequacy

1. NDEP’s DeterminationThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 41 of 45 NDEP has determined that no substantiv e revision of the Nevada Regional Haze Implementation Plan is warranted at this time in order to achieve the RPGs in 2018 for visibility improvement at Jarbidge and at other Class I areas affected by emissions from Nevada. NDEP concludes that no additional cont rols are necessary based on the evidence presented in the Progress Report regarding the firs t half of the first phase of the program. The Report documents a substantial reduction in anthropogenic emission s in Nevada as well as an improvement in visibility at Jarbidge even t hough BART controls and other state and federal measures are not yet fully implemented. Further changes in source activity that were not included in the State’s plan further support the conclusion that progress is adequate.

2. EPA’s Evaluation EPA proposes to find that NDEP adequate ly addresses the requirements in 40 CFR 51.308(h) by determining that the existing Neva da Regional Haze Implementation Plan requires no substantive revisions at this time to achieve the established RPGs at Jarbidge and at other Class I areas affected by emissions from Nevada. We propose to concur with the State’s negative declaration based on the analysis and docum entation presented in the Progress Report. NDEP demonstrates that emi ssions from anthropogenic s ources within the State are decreasing as are emissions from point sources in Idaho and Oregon that c ontribute to visibility impairment at Jarbidge. While the monitoring data indicates that best days at Jarbidge are getting better, we are concerned that vi sibility conditions on the worst da ys are relatively flat or only slightly improving. However, this lack of progress on the worst days is largely attributable to the impact of POM, which results primarily from na tural sources. Therefore, we propose to approve NDEP’s determination that the Nevada Re gional Haze Implementation Plan requires no substantive revisions at this time.This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 42 of 45 I. Consultation with Federal Land Managers

1. NDEP’s Consultation NDEP provided FLMs with a draft Progre ss Report on June 14, 2014, for a 60-day review prior to the public comm ent period, received comments from the U.S. Department of Interior National Parks Service (NPS) and the U. S. Department of Agriculture Forest Service (USFS), and responded to those comments as documented in Appendix C of the Progress Report. The letter from NPS dated August 15, 2014, supporte d the Report’s findings, and provided four short comments on how to improve specific aspect s of the analyses. The letter from USFS dated August 29, 2014, acknowledged the opportunity to wo rk with NDEP, but provided no specific comments. In the Progress Report, NDEP reaffirmed its commitment to continue participating in the WRAP and consulting with other states, FLMs, and tribes regard ing SIP revisions and implementation of other programs that ma y contribute to visibility impairment.

2. EPA’s Evaluation EPA proposes to find that NDEP has addres sed the requirements in 40 CFR 51.308(i)(2), (3), and (4) to provide FLMs with an opportunity for consultation in person and at least 60 days prior to a public hearing on the revised plan; include a descripti on in the revised plan of how it addressed any comments from the FLMs; and pr ovide procedures for continuing consultation between the State and FLMs. These procedural requirements for the Progress Report, a revision to the Regional Haze SIP in this case, are documented in Appendices C and D attached to the Report.
J. Public Participation

1. NDEP’s Public ProcessThis document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 43 of 45 NDEP provided a 30-day public comment period on the draft Progress Report as well as an opportunity for a public hearing. The public hearing, scheduled for October 15, 2014, was cancelled because no request for a hearing wa s received. During the public comment period, NDEP received one set of comments from the Sierra Club and Nationa l Parks Conservation
Association in a lette r dated October 16, 2014. 52 These organizations questioned whether NDEP’s analysis supports its dete rmination that progress in imp lementing the Nevada Regional Haze Implementation Plan is adequate to achieve the 2018 RPGs for Jarbidge and other Class I areas affected by Nevada’s emissions. NDEP provid ed detailed responses to these comments in Appendix D of the Progress Report.

2. EPA’s Evaluation EPA proposes to find that NDEP has fulfille d the requirements of CAA 110(a) and (l) and 40 CFR 51.102 regarding reasonable notice and public hearings.
VI. EPA’s Proposed Action EPA is proposing to approve the Nevada Regional Haze Progress Report submitted to EPA on November 18, 2014, as meeting the appli cable requirements of the CAA and RHR.
VII. Statutory and Executive Order Reviews Under the CAA, the Administrator is require d to approve a SIP submission that complies with the provisions of the Act a nd applicable Federal regulations. 53 Thus, in reviewing SIP submissions, EPA’s role is to approve state decisi ons, provided that they meet the criteria of the

52 The letter to Adele Malone, NDEP, is signed by David Vo nSeggern, Chair, Sierra Club Toiyabe Chapter; Gloria Smith, Managing Attorney, Sierra Club; and Lynn Davis, Senior Program Manager, Nevada Field Office, National Parks Conservation Association. 53 42 U.S.C. 7410(k); 40 CFR 52.02(a).This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 44 of 45 CAA. Accordingly, this proposed ac tion is to approve state law as meeting Federal requirements, and does not impose additional requirements beyond those imposed by state law. For that reason, this proposed action:

• is not a ‘‘significant regulatory action’’ subject to review by the Office of Management and Budget under Executive Order 12866 (58 FR 51735, October 4, 1993);

• does not impose an information collection bu rden under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq. );

• is certified as not having a si gnificant economic impact on a substantial number of small entities under the Regulatory Fl exibility Act (5 U.S.C. 601 et seq. );

• does not contain any unfunded mandate or signifi cantly or uniquely affect small governments, as described in the Unfunded Mandates Reform Act of 1995 (Pub. L. 104–4);

• does not have Federalism implications as sp ecified in Executive Order 13132 (64 FR 43255, August 10, 1999);

• is not an economically significant regulatory actio n based on health or safety risks subject to Executive Order 13045 (62 FR 19885, April 23, 1997);

• is not a significant regulato ry action subject to Executiv e Order 13211 (66 FR 28355, May 22, 2001);

• is not subject to requirements of Section 12(d) of the National Technology Transfer and Advancement Act of 1995 (15 U.S.C. 272 note) because it does not involve technical standards; and

• does not provide EPA with the discretionary authority to address, as appropriate, disproportionate human health or environmen tal effects, using pr acticable and legally permissible methods, under Executive Order 12898 (59 FR 7629, February 16, 1994).This document is a prepublication version signed by EPA Regional Administrator Jared Blumenfeld on August 19, 2015. We have taken steps to ensure the accuracy of this version, but it is not the o fficial version.

Page 45 of 45 In addition, this proposed action does not apply on any Indian re servation land or in any other area where EPA or an Indian tribe has demonstrated that a tribe has jurisd iction. In those areas of Indian country, the rule does not have tribal im plications and will not impose substantial direct costs on tribal governments or preempt tribal law as specified by Execu tive Order 13175 (65 FR 67249, November 9, 2000). List of Subjects in 40 CFR Part 52 Environmental protection, Air pollution control, Incorporation by referen ce, Intergovernmental relations, Nitrogen oxides, Organic carbon, Part iculate matter, Reporti ng and recordkeeping requirements, Sulfur oxides, Visi bility, Volatile organic compounds.

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

August 19, 2015 /s/

__________________________________ __________________________________ Dated: Jared Blumenfeld Regional Administrator Region IX