Source: http://federal.elaws.us/fr/6/29/2018/2018-14068
Timestamp: 2019-05-19 12:22:57
Document Index: 84521411

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2018-14068. Air Plan Approval; Vermont; Infrastructure State Implementation Plan Requirements for the 2012 PM2.5, Federal Register
Home » 2018 Issues » 83 FR (06/29/2018) » 2018-14068. Air Plan Approval; Vermont; Infrastructure State Implementation Plan Requirements for the 2012 PM2.5
2018-14068. Air Plan Approval; Vermont; Infrastructure State Implementation Plan Requirements for the 2012 PM2.5
The Environmental Protection Agency (EPA) is proposing to approve elements of a State Implementation Plan (SIP) submission from Vermont that addresses the infrastructure requirements of the Clean Air Act (CAA or Act)—including the interstate transport provisions—for the 2012 fine particle (PM2.5) National Ambient Air Quality Standards (NAAQS). The infrastructure requirements are designed to ensure that the structural components of each state's air quality management program are adequate to meet the state's responsibilities under the CAA. This action is being taken under the Clean Air Act.
Submit your comments, identified by Docket ID No. EPA-R01-OAR-2017-0696, to the www.regulations.gov website or via email to simcox.alison@epa.gov. For comments submitted to the www.regulations.gov website, follow the online instructions for submitting comments. Once submitted, comments cannot be edited or removed from www.regulations.gov. For either manner of submission, the EPA may publish any comment received to its public docket. Do not submit electronically any information you consider to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Multimedia submissions (audio, video, etc.) must be accompanied by a written comment. The written comment is considered the official comment and should include discussion of all points you wish to make. The EPA will generally not consider comments or comment contents located outside of the primary submission (i.e., on the web, cloud, or other file sharing system). For additional submission methods, please contact the person identified in the “For Further Information Contact” section. For the full EPA public comment policy, information about CBI or multimedia submissions, and general guidance on making effective comments, please visit www.epa.gov/​dockets/​commenting-epa-dockets. Publicly available docket materials are available at www.regulations.gov or at the U.S. Environmental Protection Agency, EPA New England Regional Office, Office of Ecosystem Protection, Air Quality Planning Unit, 5 Post Office Square—Suite 100, Boston, MA. EPA requests that if at all possible, you contact the contact listed in the FOR FURTHER INFORMATION CONTACT section to schedule your inspection. The Regional Office's official hours of business are Monday through Friday, 8:30 a.m. to 4:30 p.m., excluding legal holidays.
This rulemaking addresses a SIP submission from the Vermont Department of Environmental Conservation (VT DEC). The state submitted its infrastructure SIP for the 2012 fine particle (PM2.5 [1] ) National Ambient Air Quality Standard (NAAQS) on October 31, 2017. This included an enclosure addressing the “Good Neighbor” (or “transport”) provisions for the 2012 PM2.5 NAAQS (Section 110(a)(2)(D)(i)(I) of the CAA). Under sections 110(a)(1) and (2) of the CAA, states are required to submit infrastructure SIPs to ensure that SIPs provide for implementation, maintenance, and enforcement of the NAAQS, including the 2012 PM2.5 NAAQS.
EPA is acting on a SIP submission from Vermont that addresses the infrastructure requirements of CAA sections 110(a)(1) and 110(a)(2) for the 2012 PM2.5 NAAQS.
EPA commonly refers to such SIP submissions intended to satisfy the requirements of CAA sections 110(a)(1) and 110(a)(2) as “infrastructure SIP” submissions. Although the term “infrastructure SIP” does not appear in the CAA, EPA uses the term to distinguish this type of SIP submission from submissions that are intended to satisfy other SIP requirements under the CAA, such as “nonattainment SIP” or “attainment plan SIP” submissions to address the nonattainment planning requirements of part D of title I of the CAA.
EPA highlighted the statutory requirement to submit infrastructure SIPs within 3 years of promulgation of a new NAAQS in an October 2, 2007, guidance document entitled “Guidance on SIP Elements Required Under Sections 110(a)(1) and (2) for the 1997 8-hour Ozone and PM2.5 National Ambient Air Quality Standards” (2007 Guidance). EPA has issued additional guidance documents and memoranda, including a September 13, 2013, guidance document entitled “Guidance on Infrastructure State Implementation Plan (SIP) Elements under Clean Air Act Sections 110(a)(1) and 110(a)(2)” (2013 Guidance) and a September 25, 2009, guidance document entitled “Guidance on SIP Elements Required Under Sections 110(a)(1) and (2) for the 2006 24-Hour Fine Particle (PM2.5) National Ambient Air Quality Standards (NAAQS)” (2009 Guidance).[2]
With respect to the Good Neighbor provision, the most recent relevant document was a memorandum published on March 17, 2016, entitled “Information on the Interstate Transport `Good Neighbor' Provision for the 2012 Fine Particulate Matter National Ambient Air Quality Standards under Clean Air Act Section 110(a)(2)(D)(i)(I)” (2016 memorandum). The 2016 memorandum describes EPA's past approach to addressing interstate transport, and provides EPA's general review of relevant modeling data and air quality projections as they relate to the 2012 annual PM2.5 NAAQS. The 2016 memorandum provides information relevant to EPA Regional office review of the CAA section 110 (a)(2)(D)(i)(I) “Good Neighbor” provision requirements in infrastructure SIPs with respect to the 2012 annual PM2.5 NAAQS. This rulemaking considers information provided in that memorandum.
In this notice of proposed rulemaking, EPA is proposing action on a SIP submission from the state of Vermont. In its submission, Vermont presents a detailed list of Vermont Laws and previously SIP-approved Air Quality Regulations showing how the various components of its EPA-approved SIP meet each of the requirements of section 110(a)(2) of the CAA for the 2012 PM2.5 NAAQS. The following review evaluates the state's submissions in light of section 110(a)(2) requirements and relevant EPA guidance.
For Vermont's October 31, 2017 submission addressing the 2012 PM2.5 NAAQS, we reviewed all Section 110(a)(2) elements, including the transport provisions, but excluding the three areas discussed above under the scope of this rulemaking.
Vermont's infrastructure submittal for this element cites Vermont Statutes Annotated (V.S.A) and several Vermont Air Pollution Control Regulations (VT APCR) as follows: Vermont's 10 V.S.A. § 554, “Powers,” authorizes the Secretary of the Vermont Agency of Natural Resources (ANR) to “[a]dopt, amend and repeal rules, implementing the provisions” of Vermont's air pollution control laws set forth in 10 V.S.A. chapter 23. It also authorizes the Secretary to “conduct studies, investigations and research relating to air contamination and air pollution” and to “[d]etermine by appropriate means the degree of air contamination and air pollution in the state and the several parts thereof.” Ten V.S.A. § 556, “Permits for the construction or modification of air contaminant sources,” requires applicants to obtain permits for constructing or modifying air contaminant sources, and 10 V.S.A. § 558, “Emission control requirements,” authorizes the Secretary “to establish emission control requirements . . . necessary to prevent, abate, or control Start Printed Page 30600air pollution.” EPA approved 10 V.S.A. § 554 on June 27, 2017 (82 FR 29005).
The Vermont submittal cites more than 20 specific rules that the state has adopted to control the emissions of PM2.5 and its precursors: sulfur dioxide (SO2), volatile organic compounds (VOCs), and nitrogen oxides (NOX). A few, with their EPA approval citation [4] are listed here: § 5-201—Open Burning Prohibited (63 FR 19825; April 22, 1998); § 5-251—Control of Nitrogen Oxides Emissions (81 FR 50342; August 1, 2016); § 5-252—Control of Sulfur Dioxide Emissions (81 FR 50342; August 1, 2016); § 5-261—Control of Hazardous Air Contaminants (47 FR 6014; February 10, 1982); § 5-502—Major Stationary Sources and Major Modifications (81 FR 50342; August 1, 2016); § 5-702—Excessive Smoke Emissions from Motor Vehicles (45 FR 10775; February 19, 1980).
Based upon EPA's review of the submittals, EPA proposes that Vermont meets the infrastructure SIP requirements of section 110(a)(2)(A) with respect to the 2012 PM2.5 NAAQS.
This section requires SIPs to provide for establishing and operating ambient air quality monitors, collecting and analyzing ambient air quality data, and making these data available to EPA upon request. Each year, states submit annual air monitoring network plans to EPA for review and approval. EPA's review of these annual monitoring plans includes our evaluation of whether the state: (i) Monitors air quality at appropriate locations throughout the state using EPA-approved Federal Reference Methods or Federal Equivalent Method monitors; (ii) submits data to EPA's Air Quality System (AQS) in a timely manner; and (iii) provides EPA Regional Offices with prior notification of any planned changes to monitoring sites or the network plan.
State law authorizes the Secretary of ANR, or authorized representative, to “conduct studies, investigations and research relating to air contamination and air pollution” and to “[d]etermine by appropriate means the degree of air contamination and air pollution in the state and the several parts thereof.” See 10 V.S.A. § 554(8), (9). VT DEC, one of several departments within ANR, operates an air quality monitoring network, and EPA approved the state's 2017 Annual Air Monitoring Network Plan for PM2.5 on August 23, 2017.[5] Furthermore, VT DEC populates AQS with air quality monitoring data in a timely manner, and provides EPA with prior notification when considering a change to its monitoring network or plan. EPA proposes that VT DEC has met the infrastructure SIP requirements of section 110(a)(2)(B) with respect to the 2012 PM2.5 NAAQS.
States are required to include a program providing for enforcement of the emission limits and control measures described in section 110(a)(2)(A) and for the regulation of construction of new or modified stationary sources to meet NSR requirements under PSD and nonattainment new source review (NNSR) programs. Part C of the CAA (sections 160-169B) addresses PSD, while part D of the CAA (sections 171-193) addresses NNSR requirements.[6] The evaluation of each state's submission addressing the infrastructure SIP requirements of section 110(a)(2)(C) covers the following: (i) Enforcement of SIP measures; (ii) PSD program for major sources and major modifications; and (iii) a permit program for minor sources and minor modifications.
State law provides the Secretary of ANR with the authority to enforce air pollution control requirements, including SIP-approved 10 V.S.A. § 554, which authorizes the Secretary of ANR to “[i]ssue orders as may be necessary to effectuate the purposes of [the state's air pollution control laws] and enforce the same by all appropriate administrative and judicial proceedings.” In addition, Vermont's SIP-approved regulations VT APCR § 5-501, “Review of Construction or Modification of Air Contaminant Sources,” and VT APCR § 5-502, “Major Stationary Sources and Major Modifications,” establish requirements for permits to construct, modify or operate major air contaminant sources.
EPA proposes that Vermont has met the enforcement of SIP measures requirements of section 110(a)(2)(C) with respect to the 2012 PM2.5 NAAQS.
PSD applies to new major sources or modifications made to major sources for pollutants where the area in which the source is located is in attainment of, or unclassifiable with regard to, the relevant NAAQS. The EPA interprets the CAA to require each state to make an infrastructure SIP submission for a new or revised NAAQS demonstrating that the air agency has a complete PSD permitting program in place satisfying the current requirements for all regulated NSR pollutants. VT DEC's EPA-approved PSD rules, contained at VT APCR Subchapters I, IV, and V, contain provisions that address applicable requirements for all regulated NSR pollutants, including GHGs.
With respect to current requirements for PM2.5, we evaluate Vermont's PSD program for consistency with two EPA rules. The first is a final rule issued May 16, 2008, entitled “Implementation of the New Source Review (NSR) Program for Particulate Matter Less than 2.5 Micrometers (PM2.5)” (2008 NSR Rule). See 73 FR 28321. The 2008 NSR Rule finalized several new requirements for SIPs to address sources that emit direct PM2.5 and other pollutants that contribute to secondary PM2.5 formation, including requirements for NSR permits to address pollutants responsible for the secondary formation of PM2.5, otherwise known as precursors. As part of identifying precursors to PM2.5, the 2008 NSR Rule also required states to revise the definition of “significant” as it relates to a net emissions increase or the potential of a source to emit pollutants. Finally, the 2008 NSR Rule requires states to account for PM2.5 and PM10 condensables for applicability determinations and in establishing emissions limitations for PM2.5 and PM10 in PSD permits beginning on or Start Printed Page 30601after January 1, 2011.[7] These requirements are codified in 40 CFR 51.166(b) and 52.21(b). States were required to revise their SIPs consistent with these changes to the federal regulations. On August 1, 2016 (81 FR 50342), EPA approved revisions to Vermont's PSD program satisfying these requirements of the 2008 NSR Rule. See also 82 FR 15671 at 15674-75 (March 30, 2017); 82 FR 29005 (June 27, 2017).
The second is a final rule issued October 20, 2010, entitled “Prevention of Significant Deterioration (PSD) for Particulate Matter Less Than 2.5 Micrometers (PM2.5)—Increments, Significant Impact Levels (SILs) and Significant Monitoring Concentration (SMC)” (2010 NSR Rule). See 75 FR 64864. This rule established several components for making PSD permitting determinations for PM2.5, including adding the required elements for PM2.5 into a state's existing system of “increment analysis,” which is the mechanism used in the PSD permitting program to estimate significant deterioration of ambient air quality for a pollutant in relation to new source construction or modification. The 2010 NSR Rule revised the existing system for determining increment consumption by establishing a new “major source baseline date” for PM2.5 and by establishing a trigger date for PM2.5 in relation to the definition of “minor source baseline date.” Lastly, the 2010 NSR Rule revised the definition of “baseline area” to include a level of significance of 0.3 micrograms per cubic meter, annual average, for PM2.5. These requirements are codified in 40 CFR 51.166(b) and (c) and in 40 CFR 52.21(b) and (c). States were required to revise their SIPs consistent with these changes to the federal regulations.
On August 1, 2016 (81 FR 50342) and September 14, 2016 (81 FR 63102), EPA approved revisions to the Vermont SIP that address certain aspects of EPA's 2010 NSR rule. In addition, on March 19, 2018, EPA approved the state's method for determining the amount of PSD increments available to a new or modified major source. See 83 FR 11884. As a result, Vermont's approved PSD program meets the current requirements for PM2.5.
On March 19, 2018 (83 FR 11884), EPA also approved revisions to Vermont's PSD program that addressed the PSD requirements of EPA's “Final Rule to Implement the 8- Hour Ozone National Ambient Air Quality Standard—Phase 2; Final Rule To Implement Certain Aspects of the 1990 Amendments Relating to New Source Review and Prevention of Significant Deterioration as They Apply in Carbon Monoxide, Particulate Matter, and Ozone NAAQS; Final Rule for Reformulated Gasoline,” which obligated states to revise their PSD programs to explicitly identify NOX as a precursor to ozone. See 70 FR 71612 (November 29, 2005). Therefore, Vermont's approved PSD program meets the current requirements for ozone.
With respect to GHGs, on June 23, 2014, the United States Supreme Court issued a decision addressing the application of PSD permitting requirements to GHG emissions. Utility Air Regulatory Group v. Envtl. Prot. Agency, 134 S.Ct. 2427. The Supreme Court said that EPA may not treat GHGs as an air pollutant for purposes of determining whether a source is a major source required to obtain a PSD permit. The Court also said that EPA could continue to require that PSD permits, otherwise required based on emissions of pollutants other than GHGs, contain limitations on GHG emissions based on the application of Best Available Control Technology (BACT).
On August 19, 2015 (80 FR 50199), EPA amended its PSD and Title V regulations to remove from the Code of Federal Regulations portions of those regulations that the D.C. Circuit specifically identified as vacated. EPA intends to further revise the PSD and Title V regulations to fully implement the Supreme Court and D.C. Circuit rulings in a separate rulemaking. This future rulemaking will include revisions to additional definitions in the PSD regulations.
Some states have begun to revise their existing SIP-approved PSD programs in light of these court decisions, and some states may prefer not to initiate this process until they have more information about the additional planned revisions to EPA's PSD regulations. EPA is not expecting states to have revised their PSD programs in anticipation of EPA's additional actions to revise its PSD program rules in response to the court decisions for purposes of infrastructure SIP submissions. At present, EPA has determined that Vermont's SIP is sufficient to satisfy element C with respect to GHGs because the PSD permitting program previously approved by EPA into the SIP continues to require that PSD permits (otherwise required based on emissions of pollutants other than GHGs) contain limitations on GHG emissions based on the application of BACT. Although the approved Vermont PSD permitting program may currently contain provisions that are no longer necessary in light of the Supreme Court decision, this does not render the infrastructure SIP submission inadequate to satisfy element C. The SIP contains the necessary PSD requirements at this time, and the application of those requirements is not impeded by the presence of other previously-approved provisions regarding the permitting of sources of GHGs that EPA does not consider necessary at this time in light of the Supreme Court decision. Accordingly, the Supreme Court decision does not affect EPA's proposed approval of Vermont's infrastructure SIP as to the requirements of element C.
For the purposes of the 2012 PM2.5 NAAQS infrastructure SIPs, EPA reiterates that NSR Reform regulations are not in the scope of these actions. Therefore, we are not taking action on existing NSR Reform regulations for Vermont.
The EPA is proposing to approve Vermont's infrastructure SIP for the 2012 PM2.5 NAAQS with respect to the requirement in section 110(a)(2)(C) to Start Printed Page 30602include a PSD permitting program in the SIP that covers the requirements for all regulated NSR pollutants as required by part C of the Act.
To address the pre-construction regulation of the modification and construction of minor stationary sources and minor modifications of major stationary sources, an infrastructure SIP submission should identify the existing EPA-approved SIP provisions and/or include new provisions that govern the minor source pre-construction program that regulate emissions of the relevant NAAQS pollutants. EPA approved revisions to Vermont's minor NSR program on August 1, 2016 (81 FR 50342). Vermont and EPA rely on the existing minor NSR program to ensure that new and modified sources not captured by the major NSR permitting programs, VT APCR § 5-502, do not interfere with attainment and maintenance of the 2012 PM2.5 NAAQS.
We are proposing to find that Vermont has met the requirement to have a SIP-approved minor new source review permit program as required under Section 110(a)(2)(C) for the 2012 PM2.5 NAAQS.
Section 110(a)(2)(D)(i)(I) of the CAA requires a SIP to prohibit any emissions activity in the state that will contribute significantly to nonattainment or interfere with maintenance of the NAAQS in any downwind state. EPA commonly refers to these requirements as prong 1 (significant contribution to nonattainment) and prong 2 (interference with maintenance), or jointly as the “Good Neighbor” or “transport” provisions of the CAA. This rulemaking proposes action on the portion of Vermont's October 31, 2017 SIP submission that addresses the prong 1 and 2 requirements with respect to the 2012 PM2.5 NAAQS.
EPA's analysis for CSAPR, conducted consistent with the four-step framework, included air-quality modeling that evaluated the impacts of 38 eastern states on identified receptors in the eastern United States. EPA indicated that, for step 2 of the framework, states with impacts on downwind receptors that are below the contribution threshold of 1% of the relevant NAAQS would not be considered to significantly contribute to nonattainment or interfere with maintenance of the relevant NAAQS, and would, therefore, not be included in CSAPR. See 76 FR 48220, August 8, 2011. EPA further indicated that such states could rely on EPA's analysis for CSAPR as technical support in order to demonstrate that their existing or future interstate transport SIP submittals are adequate to address the transport requirements of 110(a)(2)(D)(i)(I) with regard to the relevant NAAQS. Id.
For all, but one, monitoring sites in the eastern United States, the modeling data provided in the 2016 memorandum showed that monitors were expected to both attain and maintain the 2012 PM2.5 NAAQS in both 2017 and 2025. The modeling results project that this one monitor, the Liberty monitor, (ID number 420030067), located in Allegheny County, Pennsylvania, will be above the 2012 annual PM2.5 NAAQS in 2017, but only under the model's maximum projected conditions, which are used in EPA's interstate transport framework to identify maintenance receptors. The Liberty monitor (along with all the other Allegheny County Start Printed Page 30603monitors) is projected to both attain and maintain the NAAQS in 2025. The 2016 memorandum suggests that under such a condition (again, where EPA's photochemical modeling indicates an area will maintain the 2012 annual PM2.5 NAAQS in 2025, but not in 2017), further analysis of the site should be performed to determine if the site may be a nonattainment or maintenance receptor in 2021 (which, again, is the attainment deadline for moderate PM2.5 areas). The memorandum also indicates that for certain states with incomplete ambient monitoring data, additional information including the latest available data, should be analyzed to determine whether there are potential downwind air quality problems that may be impacted by transported emissions. This rulemaking considers these analyses for Vermont, as well as additional analysis conducted by EPA during review of Vermont's submittal.
To develop the projected values presented in the memorandum, EPA used the results of nationwide photochemical air-quality modeling that it recently performed to support several rulemakings related to the ozone NAAQS. Base-year modeling was performed for 2011. Future-year modeling was performed for 2017 to support the proposed CSAPR Update for the 2008 Ozone NAAQS. See 80 FR 75705 (December 3, 2015). Future-year modeling was also performed for 2025 to support the Regulatory Impact Assessment of the final 2015 Ozone NAAQS.[8] The outputs from these model runs included hourly concentrations of PM2.5 that were used in conjunction with measured data to project annual average PM2.5 design values for 2017 and 2025. Areas that were designated as moderate PM2.5 nonattainment areas for the 2012 annual PM2.5 NAAQS in 2014 must attain the NAAQS by December 31, 2021, or as expeditiously as practicable. Although neither the available 2017 nor 2025 future-year modeling data correspond directly to the future-year attainment deadline for moderate PM2.5 nonattainment areas, EPA believes that the modeling information is still helpful for identifying potential nonattainment and maintenance receptors in the 2017-2021 period. Assessing downwind PM2.5 air-quality problems based on estimates of air-quality concentrations in a future year aligned with the relevant attainment deadline is consistent with the instructions from the United States Court of Appeals for the District of Columbia Circuit in North Carolina v. EPA, 531 F.3d 896, 911-12 (D.C. Cir. 2008), that upwind emission reductions should be harmonized, to the extent possible, with the attainment deadlines for downwind areas.
Vermont's Submissions for Prongs 1 and 2
On October 31, 2017, VT DEC submitted an infrastructure SIP for the 2012 PM2.5 NAAQS that addressed prongs 1 and 2 for the 2012 PM2.5 NAAQS. Vermont's SIP submittal relied in part on EPA's analysis performed for the CSAPR rulemaking to conclude that the state will not significantly contribute to nonattainment or interfere with maintenance of the 2012 PM2.5 NAAQS in any downwind area.
EPA analyzed the state's October 2017 submittal to determine whether it fully addressed the prong 1 and 2 transport provisions with respect to the 2012 PM2.5 NAAQS. As discussed below, EPA concludes that emissions of PM2.5 and PM2.5 precursors (NOX and SO2) in Vermont will not significantly contribute to nonattainment or interfere with maintenance of the 2012 PM2.5 NAAQS in any other state.
As noted, the modeling discussed in EPA's 2016 memorandum identified one potential maintenance receptor for the 2012 PM2.5 NAAQS at the Liberty monitor (ID number 420030067), located in Allegheny County, Pennsylvania. The memorandum also identified certain states with incomplete ambient monitoring data as areas that may require further analysis to determine whether there are potential downwind air quality problems that may be impacted by transported emissions.
While developing the 2011 CSAPR rulemaking, EPA modeled the impacts of all 38 eastern states in its modeling domain on fine particulate matter concentrations at downwind receptors in other states in the 2012 analysis year in order to evaluate the contribution of upwind states on downwind states with respect to the 1997 and 2006 PM2.5. Although the modeling was not conducted for purposes of analyzing upwind states' impacts on downwind receptors with respect to the 2012 PM2.5 NAAQS, the contribution analysis for the 1997 and 2006 standards can be informative for evaluating Vermont's compliance with the Good Neighbor provision for the 2012 standard.
This CSAPR modeling showed that Vermont had a very small impact (0.002 μg/m3 annual PM2.5) on the Liberty monitor in Allegheny County, Pennsylvania, which is the only out-of-state monitor that may be a nonattainment or maintenance receptor in 2021. (A spreadsheet showing CSAPR contributions for ozone and PM2.5 is included in docket EPA-HQ-OAR-2009-0491-4228.) Although EPA has not proposed a particular threshold for evaluating the 2012 PM2.5 NAAQS, EPA notes that Vermont's impact on the Liberty monitor is far below the threshold of 1% for the annual 2012 PM2.5 NAAQS (i.e., 0.12 μg/m3) that EPA previously used to evaluate the contribution of upwind states to downwind air-quality monitors. Therefore, even if the Liberty monitor were considered a receptor for purposes of transport, the EPA proposes to conclude that Vermont will not significantly contribute to nonattainment, or interfere with maintenance, of the 2012 PM2.5 NAAQS at that monitor.
In addition to regional emissions reductions and plant closures, Start Printed Page 30604additional local reductions to both direct PM2.5 and SO2 emissions are expected to occur and should contribute to further declines in Allegheny County's PM2.5 monitor concentrations. For example, significant SO2 reductions have recently occurred at US Steel's integrated steel mill facilities in southern Allegheny County as part of a 1-hr SO2 NAAQS SIP.[9] Reductions are largely due to declining sulfur content in the Clairton Coke Work's coke oven gas (COG). Because this COG is burned at US Steel's Clairton Coke Works, Irvin Mill, and Edgar Thompson Steel Mill, these reductions in sulfur content should contribute to much lower PM2.5 precursor emissions in the immediate future. The Allegheny SO2 SIP also projects lower SO2 emissions resulting from vehicle fuel standards, reductions in general emissions due to declining population in the Greater Pittsburgh region, and several shutdowns of significant sources of emissions in Allegheny County.
EPA modeling projections, the recent downward trend in local and upwind emissions reductions, the expected continued downward trend in emissions between 2017 and 2021, and the downward trend in monitored PM2.5 concentrations all indicate that the Liberty monitor will attain and be able to maintain the 2012 annual PM2.5 NAAQS by 2021. See proposed approval of the Ohio Infrastructure SIP (82 FR 57689, December 7, 2017).
As noted in the 2016 memorandum, several states have had recent data-quality issues identified as part of the PM2.5 designations process. In particular, some ambient PM2.5 data for certain time periods between 2009 and 2013 in Florida, Illinois, Idaho, Tennessee, and Kentucky did not meet all data-quality requirements under 40 CFR part 50, appendix L. The lack of data means that the relevant areas in those states could potentially be in nonattainment or be maintenance receptors in 2021. However, EPA's analysis for the 2011 CSAPR rulemaking with respect to the 2006 PM2.5 NAAQS determined that Vermont's impact to all these downwind receptors would be well below the 1% contribution threshold for this NAAQS. That conclusion informs the analysis of Vermont's contributions for purposes of the 2012 PM2.5 NAAQS as well. Given this, and the fact, discussed below, that the state's PM2.5 design values for all ambient monitors have been well below the 2012 PM2.5 NAAQS during the period from 2009 to 2013, EPA concludes that it is highly unlikely that Vermont significantly contributes to nonattainment or interferes with maintenance of the 2012 PM2.5 NAAQS in areas with data-quality issues.[10]
Information in Enclosure 5 of Vermont's October 2017 SIP submission (Vermont Good Neighbor SIP) corroborates EPA's proposed conclusion that Vermont's SIP meets its obligations under CAA section 110(a)(2)(D)(i)(I). This enclosure includes 2011-2015 design values for the 2012 PM2.5 NAAQS in the bordering states of Massachusetts, New Hampshire and New York, which are all well below the annual standard (12.0 μg/m3). In addition, the analysis includes a graph showing that the design-value trend at the four ambient monitoring locations in Vermont declined from 2005 to 2016.
This technical analysis is supported by additional indications that air quality is improving and emissions are falling in Vermont. Specifically, certified annual PM2.5 monitor values (for monitors meeting minimum data completeness criteria) recorded since 2014 show that the highest value in 2015 was 9.1 μg/m[3] at a monitor in Rutland, and the highest value in 2016 was 6.8 μg/m[3] at the same monitor in Rutland.[11]
Second, Vermont's sources are well-controlled. Vermont's 2017 submission indicates that the state has many SIP-approved rules and programs that limit emissions of PM2.5, including rules to control emissions of SO2, PM2.5, VOCs and NOX [12] ; Vermont's PSD program contained in VT APCR Subchapters I, IV, and V; Vermont's Regional Haze SIP; and Vermont's Title V program contained in Subchapter X of VT APCR. In addition, Vermont adopted limitations on sulfur in fuel (VT APCR § 5-221(1)) on September 28, 2011.
It should also be noted that Vermont is not in the CSAPR program because EPA analyses show that the state does not emit ozone-season NOX at a level that contributes significantly to non-attainment or interferes with maintenance of the 1997 and 2006 PM2.5 NAAQS in any other state.
For the reasons explained herein, EPA agrees with Vermont's conclusions and proposes to determine that Vermont will not significantly contribute to nonattainment or interfere with maintenance of the 2012 PM2.5 NAAQS in any other state. Therefore, EPA is proposing to approve the October 2017 infrastructure SIP submission from Vermont addressing prongs 1 and 2 of CAA section 110(a)(2)(D)(i)(I) for the 2012 PM2.5 NAAQS.
To prevent significant deterioration of air quality, this sub-element requires SIPs to include provisions that prohibit any source or other type of emissions activity in one state from interfering with measures that are required in any other state's SIP under Part C of the CAA. As explained in the 2013 Guidance, a state may meet this requirement with respect to in-state sources and pollutants that are subject to PSD permitting through a comprehensive PSD permitting program that applies to all regulated NSR pollutants and that satisfies the requirements of EPA's PSD implementation rules. As discussed above under element C, Vermont has such a PSD permitting program. For in-state sources not subject to PSD, this requirement can be satisfied through a fully-approved nonattainment new source review (NNSR) program with respect to any previous NAAQS. EPA's latest approval of some revisions to Vermont's NNSR regulations was on August 1, 2016 (81 FR 50342). Therefore, we are proposing to approve this sub-element for the 2012 PM2.5 NAAQS.
With regard to applicable requirements for visibility protection of section 110(a)(2)(D)(i)(II), states are subject to visibility and regional-haze program requirements under part C of the CAA (which includes sections 169A and 169B). The 2009 Guidance, 2011 Guidance, and 2013 Guidance recommend that these requirements can be satisfied by an approved SIP addressing reasonably attributable visibility impairment, if required, or an approved SIP addressing regional haze. A fully approved regional haze SIP meeting the requirements of 40 CFR 51.308 will ensure that emissions from sources under an air agency's jurisdiction are not interfering with measures required to be included in other air agencies' plans to protect visibility. Vermont's Regional Haze SIP was approved by EPA on May 22, 2012 (77 FR 30212). Accordingly, EPA proposes that Vermont has met the Start Printed Page 30605visibility protection requirements of 110(a)(2)(D)(i)(II) for the 2012 PM2.5 NAAQS.
On August 1, 2016 (81 FR 50342), EPA approved revisions to VT APCR § 5-501, which includes a provision that requires VT ANR to provide notice of a draft PSD permit to, among other entities, any state whose lands may be affected by emissions from the source. VT APCR § 5-501(7)(c). Vermont's public notice requirements are consistent with the Federal PSD program's public notice requirements for affected states under 40 CFR 51.166(q). Therefore, we propose to approve Vermont's compliance with the infrastructure SIP requirements of section 126(a) with respect to with respect to the 2012 PM2.5 NAAQS. Vermont has no obligations under any other provision of section 126, and no source or sources within the state are the subject of an active finding under section 126 of the CAA with respect to the 2012 PM2.5 NAAQS.
This sub-element also requires each SIP to contain provisions requiring compliance with the applicable requirements of section 115 relating to international pollution abatement. There are no final findings under section 115 of the CAA against Vermont with respect to the 2012 PM2.5 NAAQS. Therefore, EPA is proposing that Vermont has met the applicable infrastructure SIP requirements of section 110(a)(2)(D)(ii) related to section 115 of the CAA for the 2012 PM2.5 NAAQS.
Section 110(a)(2)(E)(i) requires each SIP to provide assurances that the state will have adequate personnel, funding, and legal authority under state law to carry out its SIP. In addition, section 110(a)(2)(E)(ii) requires each state to comply with the requirements under CAA section 128 about state boards. Finally, section 110(a)(2)(E)(iii) requires that, where a state relies upon local or regional governments or agencies for the implementation of its SIP provisions, the state retain responsibility for ensuring implementation of SIP obligations with respect to relevant NAAQS. Section 110(a)(2)(E)(iii), however, does not apply to this action because Vermont does not rely upon local or regional governments or agencies for the implementation of its SIP provisions.
Vermont, through its infrastructure SIP submittals, has documented that its air agency has the requisite authority and resources to carry out its SIP obligations. Vermont cites 10 V.S.A. § 553, which designates ANR as the air pollution control agency of the state, and 10 V.S.A § 554, which provides the Secretary of ANR with the power to “[a]dopt, amend and repeal rules, implementing the provisions” of 10 V.S.A. Chapter 23, Air Pollution Control, and to “[a]ppoint and employ personnel and consultants as may be necessary for the administration of” 10 V.S.A. Chapter 23. Section 554 also authorizes the Secretary of ANR to “[a]ccept, receive and administer grants or other funds or gifts from public and private agencies, including the federal government, for the purposes of carrying out any of the functions of” 10 V.S.A. Chapter 23. Additionally, 3 V.S.A. § 2822 provides the Secretary of ANR with the authority to assess air permit and registration fees, which fund state air programs. In addition to Federal funding and permit and registration fees, Vermont notes that the Vermont Air Quality and Climate Division (AQCD) receives state funding to implement its air programs.[13]
EPA proposes that Vermont has met the infrastructure SIP requirements of this portion of section 110(a)(2)(E) with respect to the 2012 PM2.5 NAAQS.
In Vermont, no board or body approves permits or enforcement orders; these are approved by the Secretary of Vermont ANR. Thus, with respect to this sub-element, Vermont is subject only to the requirements of paragraph (a)(2) of section 128 of the CAA (regarding conflicts of interest). On June 27, 2017, EPA approved Vermont's SIP revision addressing the conflict of interest requirements of section 128. See 82 FR 29005. For a detailed analysis explaining how Vermont meets these requirements, see EPA's notice of proposed rulemaking for that action. 82 FR 15671, 15678 (March 30, 2017).
EPA proposes that Vermont has met the applicable infrastructure SIP requirements for this sub-element for the 2012 PM2.5 NAAQS.
Vermont's infrastructure submittal references existing state regulations previously approved by EPA that require sources to monitor emissions and submit reports. In particular, VT APCR § 5-405, Required Air Monitoring, (45 FR 10775, February 19, 1980), provides that ANR “may require the owner or operator of any air contaminant source to install, use and maintain such monitoring equipment and records, establish and maintain such records, and make such periodic Start Printed Page 30606emission reports as [ANR] shall prescribe.” Moreover, section 5-402, Written Reports When Requested (81 FR 50342; August 1, 2016), authorizes ANR to “require written reports from the person operating or responsible for any proposed or existing air contaminant source, which reports shall contain,” among other things, information concerning the “nature and amount and time periods or durations of emissions and such other information as may be relevant to the air pollution potential of the source. These reports shall also include the results of such source testing as may be required under Section 5-404 herein.” Section 5-404, Methods for Sampling and Testing of Sources (45 FR 10775 February 19, 1980) in turn authorizes ANR to “require the owner or operator of [a] source to conduct tests to determine the quantity of particulate and/or gaseous matter being emitted” and requires a source to allow access, should ANR have reason to believe that emission limits are being violated by the source, and allows ANR “to conduct tests of [its] own to determine compliance.” In addition, operators of sources that emit more than five tons of any and all air contaminants per year are required to register the source with the Secretary of ANR and to submit emissions data annually, pursuant to § 5-802, Requirement for Registration, and § 5-803, Registration Procedure (60 FR 2524 January 10, 1995). Vermont also certifies that nothing in its SIP would preclude the use, including the exclusive use, of any credible evidence or information, relevant to whether a source would have been in compliance with applicable requirements if the appropriate performance or compliance test or procedure had been performed. See 40 CFR 51.212(c).
Vermont's infrastructure SIP submittal for the 2012 PM2.5 NAAQS provides for correlation by VT DEC of emissions reports by sources with applicable emission limitations or standards, as required by CAA § 110(a)(2)(F)(iii). Vermont receives emissions data through its annual registration program. Currently, VT DEC analyzes a portion of these data manually to correlate a facility's actual emissions with permit conditions, NAAQS, and, if applicable, hazardous air contaminant action levels. VT DEC reports that it is in the process of setting up an integrated electronic database that will merge all air contaminant source information across permitting, compliance and registration programs, so that information concerning permit conditions, annual emissions data, and compliance data will be accessible in one location for a particular air contaminant source. The database will be capable of correlating certain emissions data with permit conditions and other applicable standards electronically, where feasible, to allow VT DEC to complete this correlation more efficiently and accurately.
Regarding the section 110(a)(2)(F) requirement that the SIP ensure that the public has availability to emission reports, Vermont certified in its October 31, 2017 submittal for the 2012 PM2.5 NAAQS that the Vermont Public Records Act, 1 V.S.A. §§ 315-320, provides for the free and open examination of public records, including emissions reports. Furthermore, 10 V.S.A. § 563 specifically provides that the ANR “Secretary shall not withhold emissions data and emission monitoring data from public inspection or review” and “shall keep confidential any record or other information furnished to or obtained by the Secretary concerning an air contaminant source, other than emissions data and emission monitoring data, that qualifies as a trade secret pursuant to 1 V.S.A. § 317(c)(9).” (emphasis added). EPA approved section 563 into the Vermont SIP on June 27, 2017 (82 FR 29005).
Consequently, EPA proposes that Vermont has met the infrastructure SIP requirements of section 110(a)(2)(F) for the 2012 PM2.5 NAAQS.
On June 27, 2017, EPA approved a Vermont SIP revision addressing the requirement that the plan provide for state authority comparable to that in section 303 of the CAA. See 82 FR 29005. For a detailed analysis explaining how Vermont meets this requirement, see EPA's March 30, 2017 (82 FR 15671, 15679) notice of proposed rulemaking for that action. Therefore, we are proposing to approve the state's submittals with respect to this requirement of Section 110(a)(2)(G) for 2012 PM2.5 NAAQS.
Section 110(a)(2)(G) also requires that Vermont have an approved contingency plan for any Air Quality Control Region (AQCR) within the state that is classified as Priority I, IA, or II for certain pollutants. See 40 CFR 51.150, 51.152(c). In general, contingency plans for Priority I, IA, and II areas must meet the applicable requirements of 40 CFR part 51, subpart H (40 CFR 51.150 through 51.153) (“Prevention of Air Pollution Emergency Episodes”) for the relevant NAAQS, if the NAAQS is covered by those regulations. In the case of PM2.5, EPA has not issued regulations that provide the ambient levels to classify different priority levels for the 2012 standard (or any PM2.5 NAAQS). EPA's 2009 Guidance recommends that states develop emergency episode plans for any area that has monitored and recorded 24-hour PM2.5 levels greater than 140 µg/m[3] since 2006. EPA's review of Vermont's certified air quality data in AQS indicates that the highest 24-hour PM2.5 level since 2006 was 43.5 µg/m[3] , which occurred in 2015 at the ambient monitor in Rutland.[14] Thus, an emergency episode plan for PM2.5 is not necessary. Although not expected, if PM2.5 conditions were to change, Vermont does have general authority, as noted previously (i.e., 10 V.S.A. § 560 and 10 V.S.A. § 8009), to order a source to cease operations if it is determined that emissions from the source pose an imminent danger to human health or safety or an immediate threat of substantial harm to the environment.
In addition, as stated in Vermont's infrastructure SIP submittal under the discussion of public notification (Element J), Vermont posts near real-time air quality data, air quality predictions and a record of historical data on the VT DEC website and distributes air quality alerts by email to many parties, including the media. Alerts include information about the health implications of elevated pollutant levels and list actions to reduce emissions and to reduce the public's exposure. In addition, daily forecasted fine particle levels are also made available on the internet through the EPA AirNow and EnviroFlash systems. Information regarding these two systems is available on EPA's Start Printed Page 30607website at www.airnow.gov. Notices are sent out to EnviroFlash participants when levels are forecast to exceed the current 24-hour PM2.5 standard.
EPA proposes that Vermont has met the applicable infrastructure SIP requirements for section 110(a)(2)(G) with respect to contingency plans for the 2012 PM2.5 NAAQS.
This section requires that a state's SIP provide for revision from time to time as may be necessary to take account of changes in the NAAQS or availability of improved methods for attaining the NAAQS and whenever the EPA finds that the SIP is substantially inadequate. To address this requirement, Vermont's infrastructure submittal references 10 V.S.A § 554, which provides the Secretary of Vermont ANR with the power to “[p]repare and develop a comprehensive plan or plans for the prevention, abatement and control of air pollution in this state” and to “[a]dopt, amend and repeal rules, implementing the provisions” of Vermont's air pollution control laws set forth in 10 V.S.A. chapter 23. EPA approved 10 V.S.A. § 554 on June 27, 2017 (82 FR 29005). EPA proposes that Vermont has met the infrastructure SIP requirements of CAA section 110(a)(2)(H) with respect to the 2012 PM2.5 NAAQS.
Section 110(a)(2)(J) of the CAA requires that each SIP “meet the applicable requirements of section 121 of this title (relating to consultation), section 127 of this title (relating to public notification), and part C of this subchapter (relating to PSD of air quality and visibility protection).” The evaluation of the submission from Vermont with respect to these requirements is described below.
Vermont's 10 V.S.A § 554 specifies that the Secretary of Vermont ANR shall have the power to “[a]dvise, consult, contract and cooperate with other agencies of the state, local governments, industries, other states, interstate or interlocal agencies, and the federal government, and with interested persons or groups.” EPA approved 10 V.S.A. § 554 on June 27, 2017 (82 FR 29005). In addition, VT APCR § 5-501(7)(c) requires VT ANR to provide notice to local governments and federal land managers of a determination by ANR to issue a draft PSD permit for a major stationary source or major modification. On August 1, 2016 (81 FR 50342), EPA approved VT APCR § 5-501(7)(c) into Vermont's SIP. Therefore, EPA proposes that Vermont has met the infrastructure SIP requirements of this portion of section 110(a)(2)(J) with respect to the 2012 PM2.5 NAAQS.
Vermont's 10 V.S.A § 554 authorizes the Secretary of Vermont ANR to “[c]ollect and disseminate information and conduct educational and training programs relating to air contamination and air pollution.” In addition, the VT DEC Air Quality and Climate Division website includes near real-time air quality data, and a record of historical data. Air quality forecasts are distributed daily via email to interested parties. Air quality alerts are sent by email to a large number of affected parties, including the media. Alerts include information about the health implications of elevated pollutant levels and list actions to reduce emissions and to reduce the public's exposure. Also, Air Quality Data Summaries of the year's air quality monitoring results are issued annually and posted on the VT DEC Air Quality and Climate Division website. Vermont is also an active partner in EPA's AirNow and EnviroFlash air quality alert programs.
EPA proposes that Vermont has met the infrastructure SIP requirements of this portion of section 110(a)(2)(J) with respect to the 2012 PM2.5 NAAQS.
EPA has already discussed Vermont's PSD program in the context of infrastructure SIPs in the paragraphs addressing section 110(a)(2)(C) and 110(a)(2)(D)(i)(II) and determined that it satisfies the requirements of EPA's PSD implementation rules. Therefore, the SIP also satisfies the PSD sub-element of section 110(a)(2)(J) for the 2012 PM2.5 NAAQS.
Based on the above analysis, EPA proposes that Vermont has met the infrastructure SIP requirements of section 110(a)(2)(J) with respect to the 2012 PM2.5 NAAQS.
Section 110(a)(2)(K) of the Act requires that a SIP provide for the performance of such air quality modeling as the EPA Administrator may prescribe for the purpose of predicting the effect on ambient air quality of any emissions of any air pollutant for which EPA has established a NAAQS, and the submission, upon request, of data related to such air quality modeling. EPA has published modeling guidelines at 40 CFR part 51, appendix W, for predicting the effects of emissions of criteria pollutants on ambient air quality. EPA also recommends in the 2013 Guidance that, to meet section 110(a)(2)(K), a state submit or reference the statutory or regulatory provisions that provide the air agency with the authority to conduct such air quality modeling and to provide such modeling data to EPA upon request. See 2013 Guidance at 55.
In its submittal, Vermont cites to VT APCR § 5-406, Required Air Modeling, Start Printed Page 30608which authorizes “[t]he Air Pollution Control Officer [to] require the owner or operator of any proposed air contaminant source . . . to conduct . . . air quality modeling and to submit an air quality impact evaluation to demonstrate that operation of the proposed source . . . will not directly or indirectly result in a violation of any ambient air quality standard, interfere with the attainment of any ambient air quality standard, or violate any applicable prevention of significant deterioration increment . . . .” Vermont reviews the potential impact of such sources consistent with EPA's “Guidelines on Air Quality Models” at 40 CFR part 51, appendix W. See VT APCR § 5-406(2). Vermont also cites to VT APCR § 5-502, Major Stationary Sources and Major Modifications, which requires the submittal of an air quality impact evaluation or air quality modeling to ANR to demonstrate impacts of new and modified major sources, in accordance with VT APCR § 5-406. The modeling data are sent to EPA along with the draft major permit. As a result, the SIP provides for such air quality modeling as the Administrator has prescribed and for the submission, upon request, of data related to such modeling.
The state also collaborates with the Ozone Transport Commission (OTC) and the Mid-Atlantic Regional Air Management Association and EPA in order to perform large-scale urban air shed modeling for ozone and PM, if necessary. EPA proposes that Vermont has met the infrastructure SIP requirements of section 110(a)(2)(K) with respect to the 2012 PM2.5 NAAQS.
Vermont implements and operates a Title V permit program. See Subchapter X of VT APCR, which was approved by EPA on November 29, 2001 (66 FR 59535). To gain this approval, Vermont demonstrated the ability to collect sufficient fees to run the program. Vermont also notes in its submittals that the costs of all CAA permitting, implementation, and enforcement for new or modified sources are covered by Title V fees, and that Vermont state law provides for the assessment of application fees from air emissions sources for permits for the construction or modification of air contaminant sources, and sets forth permit fees. See 10 V.S.A § 556, 3 V.S.A § 2822(j).
EPA proposes that Vermont has met the infrastructure SIP requirements of section 110(a)(2)(L) for the 2012 PM2.5 NAAQS.
To satisfy Element M, states must provide for consultation with, and participation by, local political subdivisions affected by the SIP. Vermont's infrastructure submittal references 10 V.S.A § 554, which was approved into the VT SIP on June 27, 2017 (82 FR 29005). This statute authorizes the Secretary of Vermont ANR to “[a]dvise, consult, contract and cooperate with other agencies of the state, local governments, industries, other states, interstate or interlocal agencies, and the federal government, and with interested persons or groups.” In addition, VT APCR § 5-501(7) provides for notification to local officials and agencies about the opportunity for participating in permitting determinations for the construction or modification of major sources. EPA proposes that Vermont has met the infrastructure SIP requirements of section 110(a)(2)(M) with respect to the 2012 PM2.5 NAAQS.
EPA is proposing to approve the elements of the infrastructure SIP submitted by Vermont on October 31, 2017 for the 2012 PM2.5 NAAQS. Specifically, EPA's proposed action regarding each infrastructure SIP requirement is contained in Table 1 below.
Table 1—Proposed Action on Vermont's Infrastructure SIP Submittal for the 2012 PM2.5 NAAQS
In the above table, the key is as follows: A, Approve; NA, Not applicable; +, Not germane to infrastructure SIPs.
4. The citations reference the most recent EPA approval of the stated rule, or of revisions to the rule. For example, § 5-252 was initially approved on February 4, 1977 (42 FR 6811), with various revisions being approved since then, with the most recent approval of revisions to the applicability section occurring on August 1, 2016 (81 FR 50342).
6. EPA considers the evaluation of permit provisions that implement Part D to be outside the scope of an infrastructure SIP action because SIPs incorporating necessary local nonattainment area controls are due on separate schedules, pursuant to CAA section 172 and the various pollutant-specific subparts 2 through 5 of part D. Thus, our review under section 110(a)(2)(C) does not evaluate the nonattainment NSR program required by part D of the Act. We are only evaluating the state's PSD program as required by part C of the Act and the state's minor source program (applicable regardless of attainment status) as required by section 110(a)(2)(C).
7. On January 4, 2013, the U.S. Court of Appeals for the D.C. Circuit held that EPA should have issued the 2008 NSR Rule in accordance with the CAA's requirements for PM10 nonattainment areas (Title I, Part D, subpart 4), and not the general requirements for nonattainment areas under subpart 1. Nat. Res. Def. Council v. EPA, 706 F.3d 428. The EPA's approval of Vermont's infrastructure SIP as to elements C, D(i)(II), or J with respect to the PSD requirements promulgated by the 2008 NSR Rule does not conflict with the court's opinion. For more information, see 80 FR 42446, July 17, 2015).
8. See 2015 ozone NAAQS RIA at: www3.epa.gov/​ttnecas1/​docs/​20151001ria.pdf.
9. www.achd.net/​air/​pubs/​SIPs/​SO2_​2010_​NAAQS_​SIP_​9-14-2017.pdf.
10. Vermont's PM2.5 design values for all ambient monitors from 2004-2006 through 2013-2015 are available on Table 6 of the 2015 Design Value Report at https://19january2017snapshot.epa.gov/​air-trends/​air-quality-design-values_​.html.
11. 24-hour and annual PM2.5 monitor values for individual monitoring sites throughout Vermont are available at www.epa.gov/​outdoor-air-quality-data/​monitor-values-report.
12. SO2, NOX and VOCs contribute to the formation of PM2.5.
13. VT ANR's authority to carry out the provisions of the SIP identified in 40 CFR 51.230 is discussed in the sections of this document assessing elements A, C, F, and G, as applicable.
14. 24-hour PM2.5 monitor values for individual monitoring sites throughout Vermont are available at www.epa.gov/​outdoor-air-quality-data/​monitor-values-report.
[FR Doc. 2018-14068 Filed 6-28-18; 8:45 am]
30598-30609 (12 pages)
EPA-R01-OAR-2017-0696, FRL-9979-82-Region 1
2018-14068.pdf