Federal Register / Vol. 87, No. 113 / Monday, June 13, 2022 / Proposed Rules 35705 

1 80 FR 65292. 

2Letter dated February 23, 2018, from Greg 

Lovato, Administrator, Nevada Division of 

Environmental Protection, to Alexis Strauss, Acting 

Regional Administrator, EPA Region IX. 

3 83 FR 25776, 25819. 

4 83 FR 62998. 

5The RFP requirements specified in CAA section 

182(b)(1) apply to all areas classified as ‘‘Moderate’’ 

or higher ozone nonattainment. At the time of 

submittal of the Clark County base year emissions 

inventory SIPs for the 2015 ozone NAAQS, the 

Clark County area was designated Marginal 

nonattainment for the 2015 ozone NAAQS and were 

therefore not required to demonstrate RFP toward 

attainment of the 2015 ozone NAAQS. 

Indian country, the proposed rule does 

not have tribal implications and will not 

impose substantial direct costs on tribal 

governments or preempt tribal law as 

specified by Executive Order 13175 (65 

FR 67249, November 9, 2000). 

List of Subjects in 40 CFR Part 52 

Environmental protection, Air 

pollution control, Carbon monoxide, 

Hydrocarbons, Incorporation by 

reference, Intergovernmental relations, 

Lead, Nitrogen dioxide, Particulate 

matter, Sulfur dioxide, Reporting and 

recordkeeping requirements, Volatile 

organic compounds. 

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

Dated: June 1, 2022. 

Earthea Nance, 

Regional Administrator, Region 6. 

[FR Doc. 2022–12608 Filed 6–10–22; 8:45 am] 

BILLING CODE 6560–50–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 52 

[EPA–R09–OAR–2022–0131; FRL–9739–01– 

R9] 

Clean Air Plans; Base Year Emissions 

Inventories for the 2015 Ozone 

Standards; Nevada; Clark County, Las 

Vegas Valley 

AGENCY: Environmental Protection 

Agency (EPA). 

ACTION: Proposed rule. 

SUMMARY: The Environmental Protection 

Agency (EPA) is proposing to approve, 

under the Clean Air Act (CAA or ‘‘Act’’), 

revisions to the Nevada State 

Implementation Plan (SIP) concerning 

the base year emissions inventory 

requirements for the Las Vegas Valley 

ozone nonattainment area located 

within Clark County for the 2015 ozone 

national ambient air quality standards 

(NAAQS or ‘‘standards’’). 

DATES: Any comments must arrive by 

July 13, 2022. 

ADDRESSES: Submit your comments, 

identified by Docket ID No. EPA–R09– 

OAR–2022–0131 at https://

www.regulations.gov. For comments 

submitted at Regulations.gov, follow the 

online instructions for submitting 

comments. Once submitted, comments 

cannot be edited or removed from 

Regulations.gov. The EPA may publish 

any comment received to its public 

docket. Do not submit electronically any 

information you consider to be 

Confidential Business Information (CBI) 

or other information whose disclosure is 

restricted by statute. Multimedia 

submissions (audio, video, etc.) must be 

accompanied by a written comment. 

The written comment is considered the 

official comment and should include 

discussion of all points you wish to 

make. The EPA will generally not 

consider comments or comment 

contents located outside of the primary 

submission (i.e., on the web, cloud, or 

other file sharing system). For 

additional submission methods, please 

contact the person identified in the FOR

FURTHER INFORMATION CONTACT section. 

For the full EPA public comment policy, 

information about CBI or multimedia 

submissions, and general guidance on 

making effective comments, please visit 

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

commenting-epa-dockets. If you need 

assistance in a language other than 

English or if you are a person with 

disabilities who needs a reasonable 

accommodation at no cost to you, please 

contact the person identified in the FOR

FURTHER INFORMATION CONTACT section. 

FOR FURTHER INFORMATION CONTACT: 

Lindsay Wickersham, Air Planning 

Office (AIR–2), EPA Region IX, (415) 

947–4192, Wickersham.Lindsay@

epa.gov. 

SUPPLEMENTARY INFORMATION: 

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

and ‘‘our’’ refer to the EPA. 

Table of Contents 

I. Background 

A. Emissions Inventories 

B. State Submittals 

C. Public Notice and Hearing Requirements 

II. Clark County’s Emissions Inventory 

A. Base Year Emissions Inventory for the 

Las Vegas Valley Nonattainment Area 

III. EPA’s Evaluation 

IV. Proposed Action and Request for Public 

Comment 

V. Statutory and Executive Order Reviews 

I. Background 

On October 26, 2015, the EPA 

promulgated a revised 8-hour ozone 

NAAQS of 0.070 parts per million.1 In 

accordance with section 107(d) of the 

CAA, the EPA must designate an area 

‘‘nonattainment’’ if it is violating the 

NAAQS or if it is contributing to a 

violation of the NAAQS in a nearby 

area. In February 2018, Clark County 

submitted a recommendation based on 

2015–2017 monitoring data, requesting 

that the Las Vegas Valley be designated 

nonattainment for the 2015 ozone 

NAAQS.2 The EPA approved the 

request and designated the Las Vegas 

Valley in Clark County as a ‘‘Marginal’’ 

ozone nonattainment zone for the 2015 

ozone NAAQS effective August 3, 

2018.3

A. Emissions Inventories 

Sections 172(c)(3) and 182(a)(1) of the 

CAA require states to develop and 

submit, as a SIP revision, ‘‘base year’’ 

emissions inventories for all areas 

designated as nonattainment for an 

ozone NAAQS. The EPA finalized the 

2015 ozone NAAQS SIP Requirements 

Rule (SRR) on December 6, 2018.4 The 

SRR established implementation 

requirements for the 2015 ozone 

NAAQS, including requirements for 

base year emissions inventories under 

CAA section 182(a)(1). The SRR for the 

2015 ozone NAAQS is codified at 40 

CFR part 51, subpart CC, and the 

emissions inventory requirements are 

codified at 40 CFR 51.1315. 

An emissions inventory for ozone is 

an estimation of actual emissions of air 

pollutants that contribute to the 

formation of ozone in an area. Ozone is 

a gas that is formed by the reaction of 

volatile organic compounds (VOC) and 

oxides of nitrogen (NOX), referred to as 

ozone precursors, in the atmosphere in 

the presence of sunlight. Therefore, an 

emissions inventory for ozone focuses 

on the emissions of VOC and NOX. VOC 

is emitted by many types of sources, 

including power plants, industrial 

sources, on-road and off-road mobile 

sources, smaller stationary sources 

collectively referred to as area sources, 

and biogenic sources. NOX is primarily 

emitted by combustion sources, both 

stationary and mobile. 

Emissions inventories provide 

emissions data that inform a variety of 

air quality planning tasks, including the 

following: establishing baseline 

emissions levels, calculating emissions 

reduction targets needed to attain the 

NAAQS and to achieve reasonable 

further progress (RFP) toward 

attainment of an ozone standard,5

determining emissions inputs for ozone 

air quality modeling analyses, and 

tracking emissions over time to 

determine progress toward achieving air 

quality and emissions reduction goals. 

For the 2015 ozone NAAQS, states are 

required to submit ozone season day 

emissions estimates for an inventory 

calendar year to be consistent with the 


khammond on DSKJM1Z7X2PROD with PROPOSALS
35706 Federal Register / Vol. 87, No. 113 / Monday, June 13, 2022 / Proposed Rules 

6 40 CFR 51.1315(a). 

7 83 FR 62998, 63034. 

8EPA, ‘‘Emissions Inventory Guidance for 

Implementation of Ozone and Particulate Matter 

National Ambient Air Quality Standards (NAAQS) 

and Regional Haze Regulations’’ (May 2017), 75. 

9Letter dated October 8, 2020, from Greg Lovato, 

Administrator, Nevada Division of Environmental 

Protection, to Elizabeth Adams, Director, Air 

Division, EPA Region IX. Transmitted via US EPA’s 

State Planning Electronic Collaboration System 

(SPeCS) on October 15, 2020. 

10Email dated February 10, 2022, from Zheng Li, 

CCDES, to Lindsay Wickersham, EPA Region IX, 

Subject: ‘‘RE: Introduction and Qs on 2015 O3 EI.’’; 

Email dated February 14, 2022, from Araceli Pruett, 

CCDES to Lindsay Wickersham, EPA Region IX, 

Subject: ‘‘RE: Introduction and Qs on 2015 O3 EI.,’’ 

with attachment, ‘‘20220203 EPA Request for Add’l 

Info on 2015 O3 EI.docx.’’; Email Dated March 30, 

2022, from Araceli Pruett, CCDES to Lindsay 

Wickersham, EPA Region IX, Subject: ‘‘RE: A few 

questions: ERCs, QA, etc.,’’ with attachment, 

‘‘20220329 EPA Request for Add’l Info on 2015 O3 

EI.docx.’’ 

11Locomotive emissions are included in the 

nonpoint category. Aircraft and airport ground 

support equipment are included in the aviation 

categories. 

12See 83 FR 25776, 25819 (June 4, 2018) 

(providing a description of the boundaries of the 

Clark County nonattainment area for the 2015 ozone 

NAAQS); see also Figure 1–1 in 2020 Clark County 

EI for a map of the nonattainment area. 

13 In Clark County, the highest ambient ozone 

concentrations generally occur during the months 

baseline year for RFP plans as required 

by 40 CFR 51.1310(b).6 Under 40 CFR 

51.1310(b), for the 2015 ozone NAAQS, 

the RFP baseline year is the most recent 

calendar year for which a complete 

triennial inventory is required to be 

submitted to the EPA under 40 CFR 51 

subpart A.7 States may use an 

alternative base year emissions 

inventory provided that the year 

selected corresponds with the year of 

the effective date of designation as 

nonattainment for that NAAQS. Ozone 

season day emissions are defined in 40 

CFR 51.1300(q) as ‘‘the average day’s 

emissions for a typical ozone season 

work weekday.’’ Under the definition in 

40 CFR 51.1300(q), states are required to 

select the months in the ozone season 

and the days in the work week to be 

represented. Based on the EPA’s 2017 

guidance on emissions inventory 

development, the selected ozone season 

should be representative of the 

conditions leading to nonattainment.8

B. State Submittals 

On October 15, 2020, the Nevada 

Department of Environmental Protection 

(NDEP) submitted a revision to the 

Nevada SIP titled, ‘‘Revision to the 

Nevada State Implementation Plan for 

the 2015 Ozone NAAQS: Emissions 

Inventory and Emissions Statement 

Requirements’’ (‘‘2020 Clark County 

EI’’).9 The 2020 Clark County EI 

includes a 2017 base year emissions 

inventory for the Las Vegas Valley 

nonattainment area, developed by the 

Clark County Department of 

Environment and Sustainability 

(CCDES), and supporting 

documentation regarding the 

development of the base year emissions 

inventory. 

CCDES provided supplementary 

information (SI) to the 2020 Clark 

County EI addressing comments and 

questions raised by the EPA following 

receipt of CCDES’s prior submittal on 

February 10, 2022, February 14, 2022, 

and on March 30, 2022.10 Together these 

three supplementary exchanges are 

known as the ‘‘2020 Clark County SI.’’ 

In this action, we are evaluating and 

proposing action on the 2020 Clark 

County EI and the 2020 Clark County SI 

that we will collectively refer to as the 

‘‘2020 Clark County SIP Submittal.’’ 

C. Public Notice and Hearing 

Requirements 

Sections 110(a)(1) and 110(l) of the 

CAA and 40 CFR 51.102 require states 

to provide reasonable notice and an 

opportunity for a public hearing prior to 

adoption of SIP revisions. Section 

110(k)(1)(B) requires the EPA to 

determine whether a SIP submittal is 

complete within 60 days of receipt. Any 

plan that the EPA does not affirmatively 

determine to be complete or incomplete 

will become complete by operation of 

law six months after the date of 

submittal. A finding of completeness 

does not approve the submittal as part 

of the SIP, nor does it indicate that the 

submittal is approvable. It does start a 

12-month clock for the EPA to act on the 

SIP submittal (see CAA section 

110(k)(2)). 

The 2020 Clark County SIP Submittal 

includes documentation of the public 

review process CCDES followed prior to 

its submittal to the EPA as revisions to 

the SIP. Appendix B of the 2020 Clark 

County EI includes documentation of 

notices of opportunity for public 

hearing and comment on the SIP 

submittal. CCDES posted these notices 

on CCDES Facebook and Twitter pages, 

sent them by email to interested parties, 

and posted them on CCDES and Clark 

County websites. Included in Appendix 

B of the 2020 Clark County EI are 

agendas and meeting summaries from 

two Board of Commissioners meetings, 

setting and conducting the public 

hearing. Public comment reports 

included in Appendix B indicate that 

CCDES received no comments during 

the 30-day public review period. 

II. Clark County’s Emissions Inventory 

The 2020 Clark County SIP Submittal 

addresses the emissions inventory 

requirement in CAA section 182(a)(1). 

The submittal provides documentation 

of a 2017 base year inventory of 

emissions of NOX and VOCs. The 2017 

base year emissions inventory was the 

most recent triennial emissions 

inventory in the National Emissions 

Inventory (NEI) at the time the 

emissions inventories were prepared for 

the Clark County area. 

The emissions inventory submittal 

includes emissions estimates for the 

following source categories: point 

sources, nonpoint sources, onroad 

mobile sources, nonroad mobile 

sources, commercial and federal 

aviation, and biogenic sources. Point 

sources are large, stationary (i.e., nonmobile) sources of emissions that 

release pollutants. Nonpoint sources, 

also referred to as ‘‘area’’ sources, are 

the sources of air pollutants that fall 

below point source reporting levels or 

are too small or too numerous to be 

identified individually, such as smallscale industrial or residential operations 

that use emission-generating materials 

or processes. Nonroad mobile sources 

are not certified for highway use and 

include equipment that can either move 

under their own power or can be moved 

from site to site.11 Onroad mobile 

sources are motor vehicles traveling on 

local highways and roads. Biogenic 

sources emit pollutants produced by 

natural sources including vegetation 

and soils. Commercial and federal 

aviation consists of emissions from 

aircraft and airport ground support 

equipment for commercially run 

facilities and federally owned facilities 

respectively. 

CCDES employed a combination of 

top-down estimation techniques (i.e., 

allocation of regional emissions 

estimates to a smaller, defined 

geographic area) and bottom-up 

estimation techniques (i.e., development 

of source or source category emissions 

estimates using emissions factors, 

models, etc.) to develop the emissions 

inventories in their SIP submittal. 

A. Base Year Emissions Inventory for 

the Las Vegas Valley Nonattainment 

Area 

The emissions inventory included in 

the 2020 Clark County SIP Submittal 

was developed by CCDES. The Clark 

County ozone nonattainment area for 

the 2015 NAAQS consists of 

Hydrographic Area 212, also referred to 

by CCDES as the Las Vegas Valley.12

CCDES selected the month of July to 

estimate ozone season day emissions of 

NOX and VOC from sources in the Las 

Vegas Valley.13


khammond on DSKJM1Z7X2PROD with PROPOSALS
Federal Register / Vol. 87, No. 113 / Monday, June 13, 2022 / Proposed Rules 35707 

of the year when the highest temperatures occur— 

typically from May through September. For SIP 

planning purposes, CCDES selected weekdays in 

the month of July as the basis to estimate typical 

summertime weekday emissions, as is precedent for 

Clark County SIPs. See 86 FR 43461, 43464 (August 

9, 2021). 

14All point sources identified in the Las Vegas 

Valley are permitted by the CCDES Division of Air 

Quality and required to submit annual emissions 

reports under Section 12.9 of the Clark County Air 

Quality Regulations (AQR). These annual emission 

reports were used to identify individual stationary 

point sources within the Las Vegas Valley for this 

emissions inventory. 

15On-site measurements are collected from 

emission units that are required to have CEMS, as 

outlined in Section 12.10 of the Clark County AQR. 

All other point sources emissions were calculated 

based on emissions factors in the permit and 

activity data. 

16For a map of the modeled area, see 2020 Clark 

County EI, Figure 1–1, A–4; Characterized by 

Source Classification Code (SCC) in the FF10 Flat 

data file; EPA, ‘‘Technical Support Document (TSD) 

Preparation of Emissions Inventories for the 2016v1 

North American Emissions Modeling Platform’’ 

(March 2021), 123. 

17Files and technical support documents 

available at https://www.epa.gov/air-emissionsmodeling/2016v1-platform. 

18See 2020 Clark County SI Section C for detailed 

emissions from each emission sector. 

19Locomotive, aircraft, and airport ground 

support equipment are not included in this 

category. 

20EPA, ‘‘Policy Guidance on the Use of MOVES3 

for State Implementation Plan Development, 

Transportation Conformity, General Conformity, 

and Other Purposes’’ (November 2020), 7. 

21Characterized by Source Classification Code 

(SCC) in the FF10 Flat data file; EPA, ‘‘Technical 

Support Document (TSD) Preparation of Emissions 

Inventories for the 2016v1 North American 

Emissions Modeling Platform’’ (March 2021), 123. 

22Files and technical support documents 

available at https://www.epa.gov/air-emissionsmodeling/2016v1-platform. 

23The EPA has previously accepted this 

assumption for other plans submitted regarding Las 

Vegas (see e.g., 79 FR 60078). The human 

population of the Las Vegas Valley is around 96.7 

percent. Sensitivity analysis showed that the values 

in MOVES was not sensitive to a 1.67 percent 

change. 

24BELD5 includes version 8.0 of the Forest 

Inventory and Analysis, which has better agreement 

with measured foliage biomass to improve VOC 

emissions estimates. 

In the 2020 Clark County SIP 

Submittal, the point source inventory 

includes all Title V stationary sources 

and all sources with the potential to 

emit at least 10 tons of VOCs or 25 tons 

of NOX in 2017. All sources emitting 

less than these thresholds were 

included in the nonpoint source 

category. CCDES identified 110 

stationary point sources meeting this 

point source definition in the Las Vegas 

Valley.14

CCDES calculates actual emissions 

from point sources using data collected 

from annual source emissions reports, 

permit files and associated technical 

support documents (TSD), direct on-site 

measurements (e.g., continuous 

emission monitors (CEMS)), or 

calculated using EPA emission factors 

(e.g., AP–42) and activities data.15

Nonpoint source emissions within the 

Las Vegas Valley were estimated using 

the 2017 NEI emissions estimates for 

Clark County. To generate the subcounty emissions from the Las Vegas 

Valley, the Sparse Matrix Operator 

Kernel Emissions (SMOKE) model was 

run with a 4-km grid spacing over the 

nonattainment area for July to generate 

ozone season weekday emissions 

estimates using annual nonpoint 

emissions data.16 Ancillary files 

developed by the EPA for version 1 of 

the 2016 modeling platform were used 

when running SMOKE.17 The nonpoint 

inventory includes different emissions 

sectors: locomotive, residential wood 

combustion, agriculture livestock, and 

other nonpoint sources.18

Nonroad mobile sources in the Las 

Vegas Valley emissions inventory 

encompass a wide variety of equipment 

types that are not certified for highway 

use and can either move under their 

own power or can be moved from site 

to site.19 CCDES estimated nonroad 

emissions within the Las Vegas Valley 

using the 2017 NEI emissions estimates 

for Clark County that were generated 

using the nonroad module of the EPA’s 

Motor Vehicle Emission Simulator 

(version MOVES2014b), which was the 

latest model available at the time the 

inventory was developed.20 To generate 

the sub-county emissions from the Las 

Vegas Valley, the SMOKE model was 

run with a 4-km grid spacing over the 

nonattainment area for July to generate 

ozone season weekday emissions 

estimates using monthly nonroad 

emissions data.21 Ancillary data files 

used when running SMOKE were 

developed by the EPA for version 1 of 

the 2016 modeling platform and had a 

base year of 2016 for use in 

photochemical modeling.22

Onroad mobile sources in the Las 

Vegas Valley emissions inventory 

consist of cars, trucks, buses, 

motorcycles, and other motor vehicles 

that travel on local and highway roads. 

CCDES developed a Clark Countyspecific MOVES input database for 2017 

using the latest available information. 

Key inputs for MOVES included in this 

database were annual vehicle miles 

traveled (VMT), vehicle population by 

source type, fleet age distributions, fuel 

parameters, inspection and maintenance 

programs, hoteling activity, and ambient 

temperature and humidity data. Sources 

for these inputs include the 2018 Clark 

County vehicle classification study, the 

Nevada Department of Motor Vehicle 

registration database, the Nevada 

Department of Transportation’s (NDOT) 

annual Highway Performance 

Monitoring System reports, data from 

the Regional Transportation Council, 

the online magazine Schoolbusfleet, 

meteorological data collected at 

McCarran International Airport, the 

Coordinated Research Council’s vehicle 

identification number decoding project 

and default model input files. 

To generate sub-county data from this 

database, CCDES assumed the 

population within the Las Vegas Valley 

to be 95 percent of the total population 

of Clark County 23 and used Las Vegas 

Valley specific annual VMT data for 

each vehicle source type as provided by 

NDOT. CCDES estimated emissions 

from onroad mobile sources using 

MOVES2014b in inventory mode to 

generate sub-county data for the Las 

Vegas Valley. 

Biogenic sources included in this 

inventory include crops, lawn grass, 

vegetation, soil, and forests. Emissions 

from biogenic sources in the Las Vegas 

Valley area were calculated using the 

Biogenic Emissions Inventory System 

Version 3.61 (BEIS 3.61) embedded in 

SMOKE 4.7. BEIS requires inputs of 

meteorological and landcover data. 

CCDES utilized 12-kilometer data 

collected from the 2016 version 1 

Weather Research and Forecasting 

model, and the newly released Biogenic 

Emissions Landcover Database version 5 

(BELD5).24

Emissions from commercial aviation 

within the Las Vegas Valley 

encompasses three facilities: McCarran 

International Airport, North Las Vegas 

Airport, and Henderson Executive 

Airport. Emissions inventories were 

developed using the Federal Aviation 

Administration’s Aviation 

Environmental Design Tool (AEDT) 

Version 3b. The Clark County 

Department of Aviation used default 

meteorology in AEDT with correction 

factors to account for differences in 

meteorology and activity data between 

the model’s default design day of 

October and a typical July weekday. The 

2020 Clark County SI shows corrected 

tons per day (tpd) values adjusted with 

correction factors for all three airports 

compared to the values provided in the 

2020 Clark County EI. These corrected 

values are included in Table 2 below. 

Emissions from federally controlled 

aviation sources within Las Vegas 

Valley consist entirely of emissions 

from Nellis Air Force Base. Actual 

emissions from aircraft operations were 

obtained from EPA’s 2017 NEI Data. 

CCDES employed quality assurance 

and quality control (QA/QC) measures 


khammond on DSKJM1Z7X2PROD with PROPOSALS
35708 Federal Register / Vol. 87, No. 113 / Monday, June 13, 2022 / Proposed Rules 

25CCDES, ‘‘Emissions Inventory Report Review 

and Audit Process’’ (March 2021). 

26 Gridded emissions map shown in 2020 Clark 

County SI, Section (b)(iii) and Section (c)(iii). 

27EPA, ‘‘2017 National Emissions Inventory 

Summary of Quality Assurance Information’’ 

(January 2022). 

throughout the development of the 2020 

Clark County emissions inventory. Point 

source emissions calculations were 

checked by CCDES compliance staff 

against the permitting Technical 

Support Document (TSD).25 These 

reviewed and corrected emissions data 

are used in the emissions inventories. 

Nonroad and nonpoint emissions 

outcomes were compared to those from 

the NEI and other counties for 

reasonableness and consistency and 

were checked for spatial distributions 

with gridded emissions maps.26 Onroad 

emissions had a variety of input sources 

and thus implemented multiple types of 

QA/QC practices outlined in the 2020 

Clark County SI. Emissions data 

collected for the 2017 NEI was subject 

to QA/QC from the EPA and was 

compared by CCDES to other counties 

in Nevada and to other years for 

consistency and reasonableness.27

CCDES’s QA/QC measures are described 

in further detail in the 2020 Clark 

County SI. 

Estimates of 2017 ozone season day 

emissions of NOX and VOC in the Las 

Vegas Valley are summarized in Table 2 

below. 

TABLE 2—2017 OZONE SEASON DAY EMISSIONS FOR THE LAS VEGAS VALLEY NONATTAINMENT AREA

Source category 

Pollutant 

NOX

(tpd) 

VOC 

(tpd) 

Point ......................................................................................................................................................................... 2.94 1.25 

Nonpoint ................................................................................................................................................................... 6.94 59.49 

Commercial Aviation ................................................................................................................................................ a 11.40 1.70 

Federal Aviation ....................................................................................................................................................... 0.50 0.24 

On-road Mobile ........................................................................................................................................................ 38.76 27.25 

Nonroad Mobile ....................................................................................................................................................... 36.58 23.96 

Biogenic ................................................................................................................................................................... 0.86 124.19 

Area Total ......................................................................................................................................................... 97.98 238.07 

Sources: 2020 Clark County EI section 9, 2020 Clark County SI. 

Note: 

a Corrected value provided from 2020 Clark County SI, Section e. 

III. EPA’s Evaluation 

Based on the documentation included 

in Clark County’s submittals, the EPA 

finds that the submittals satisfy the 

procedural requirements of sections 

110(a)(1) and 110(l) of the Act requiring 

states to provide reasonable notice and 

an opportunity for public hearing prior 

to adoption of SIP revisions. The 2020 

Clark County SIP Submittal became 

complete by operation of law on April 

15, 2021, pursuant to CAA section 

110(k)(1)(B). 

The EPA has reviewed Clark County’s 

submittals for consistency with CAA 

sections 172(c)(3) and 182(a)(1) and the 

requirements for emissions inventories 

under the EPA’s implementing 

regulations for the 2015 ozone NAAQS 

at 40 CFR 51.1315. The 2017 base year 

emissions inventories represent the 

most recent calendar year for which a 

consistent and comprehensive statewide 

inventory was available. The selection 

of 2017 as the base year for the Las 

Vegas Valley emissions inventory is 

therefore consistent with the 

requirement for selection of RFP 

baseline years under 40 CFR 51.1310(b). 

We find that for the Las Vegas Valley 

emissions inventory Clark County 

appropriately estimated the average 

day’s emissions for a typical weekday in 

the ozone season, consistent with the 

definition of ozone season day 

emissions under 40 CFR 51.1300(q). 

Clark County’s submittals document 

the procedures used by CCDES to 

estimate ozone season day emissions for 

each of the major source types. 

Documentation of emissions estimation 

procedures in the 2020 Clark County 

SIP Submittal demonstrate that CCDES 

followed acceptable procedures to 

develop emissions estimates. The 2020 

Clark County SIP Submittal also 

describes the specific QA/QC measures 

implemented to ensure the accuracy and 

integrity of data throughout the 

development of the emissions 

inventory. 

Based upon the documentation of 

emissions estimation techniques and 

QA/QC procedures employed to 

develop the emissions inventories in the 

submittal, we find that the 2020 Clark 

County SIP Submittal contains 

comprehensive, accurate, current 

inventories of actual emissions from all 

sources in the Las Vegas Valley 

nonattainment area. The EPA therefore 

proposes to approve the base year 

inventories of NOX and VOC emissions 

for the Las Vegas Valley ozone 

nonattainment area for the 2015 ozone 

NAAQS submitted by Nevada pursuant 

to 40 CFR 51.1315 and CAA sections 

172(c)(3) and 182(b)(1). 

IV. Proposed Action and Request for 

Public Comment 

We are proposing to approve the 2020 

Clark County SIP Submittal as meeting 

the ozone-related base year emissions 

inventory requirement for the Las Vegas 

Valley nonattainment area for the 2015 

ozone NAAQS. The emissions inventory 

we are proposing to approve into the 

SIP is summarized in Table 2. We are 

proposing to approve this emissions 

inventory because it contains 

comprehensive, accurate, and current 

inventories of actual emissions for all 

relevant sources in accordance with 

CAA sections 172(c)(3) and 182(a)(1). 

The EPA is soliciting public comments 

on the issues discussed in this proposed 

rule. We will accept comments from the 

public on this proposal for the next 30 

days. 

V. Statutory and Executive Order 

Reviews 

Under the Clean Air Act, the 

Administrator is required to approve a 

SIP submission that complies with the 

provisions of the Act and applicable 

federal regulations. 42 U.S.C. 7410(k); 

40 CFR 52.02(a). Thus, in reviewing SIP 

submissions, the EPA’s role is to 

approve state choices, provided that 

they meet the criteria of the Clean Air 

Act. Accordingly, this proposed action 

merely proposes to approve state plans 


khammond on DSKJM1Z7X2PROD with PROPOSALS
Federal Register / Vol. 87, No. 113 / Monday, June 13, 2022 / Proposed Rules 35709 

as meeting federal requirements and 

does not impose additional 

requirements beyond those imposed by 

state law. For that reason, this proposed 

action: 

• Is not a ‘‘significant regulatory 

action’’ subject to review by the Office 

of Management and Budget under 

Executive Orders 12866 (58 FR 51735, 

October 4, 1993) and 13563 (76 FR 3821, 

January 21, 2011); 

• Does not impose an information 

collection burden under the provisions 

of the Paperwork Reduction Act (44 

U.S.C. 3501 et seq.); 

• Is certified as not having a 

significant economic impact on a 

substantial number of small entities 

under the Regulatory Flexibility Act (5 

U.S.C. 601 et seq.); 

• Does not contain any unfunded 

mandate or significantly or uniquely 

affect small governments, as described 

in the Unfunded Mandates Reform Act 

of 1995 (Pub. L. 104–4); 

• Does not have federalism 

implications as specified in Executive 

Order 13132 (64 FR 43255, August 10, 

1999); 

• Is not an economically significant 

regulatory action based on health or 

safety risks subject to Executive Order 

13045 (62 FR 19885, April 23, 1997); 

• Is not a significant regulatory action 

subject to Executive Order 13211 (66 FR 

28355, May 22, 2001); 

• Is not subject to requirements of 

Section 12(d) of the National 

Technology Transfer and Advancement 

Act of 1995 (15 U.S.C. 272 note) because 

application of those requirements would 

be inconsistent with the Clean Air Act; 

and 

• Does not provide the EPA with the 

discretionary authority to address 

disproportionate human health or 

environmental effects with practical, 

appropriate, and legally permissible 

methods under Executive Order 12898 

(59 FR 7629, February 16, 1994). 

In addition, the SIP is not approved 

to apply on any Indian reservation land 

or in any other area where the EPA or 

an Indian tribe has demonstrated that a 

tribe has jurisdiction. The Las Vegas 

Tribe of Paiute Indians of the Las Vegas 

Indian Colony have areas of Indian 

country located within the Las Vegas 

Valley nonattainment area for the 2015 

ozone NAAQS. In those areas of Indian 

country, the proposed rule does not 

have tribal implications and will not 

impose substantial direct costs on tribal 

governments or preempt tribal law as 

specified by Executive Order 13175 (65 

FR 67249, November 9, 2000). 

List of Subjects in 40 CFR Part 52 

Environmental protection, Air 

pollution control, Incorporation by 

reference, Intergovernmental relations, 

Ozone, Reporting and recordkeeping 

requirements, Volatile organic 

compounds. 

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

Dated: June 6, 2022. 

Martha Guzman Aceves, 

Regional Administrator, Region IX. 

[FR Doc. 2022–12609 Filed 6–10–22; 8:45 am] 

BILLING CODE 6560–50–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 52 

[EPA–R07–OAR–2022–0482; FRL–9906–01– 

R7] 

Air Plan Approval; Missouri; General 

Conformity Rescission 

AGENCY: Environmental Protection 

Agency (EPA). 

ACTION: Proposed rule. 

SUMMARY: The Environmental Protection 

Agency (EPA) is proposing to approve a 

revision to the Missouri State 

Implementation Plan (SIP) relating to 

General Conformity received on April 

15, 2022. In its submission, Missouri 

requests EPA approval of rescission of 

the Missouri General Conformity Rule 

from the Missouri SIP. General 

Conformity ensures actions taken by 

federal agencies, such as airport 

construction, do not interfere with a 

state’s plans to attain and maintain 

national standards for air quality. After 

rescission of the state’s General 

Conformity Rule, federal agency actions 

will be subject to the Federal General 

Conformity Rule. 

DATES: Comments must be received on 

or before July 13, 2022. 

ADDRESSES: You may send comments, 

identified by Docket ID No. EPA–R07– 

OAR–2022–0482 to https://

www.regulations.gov. Follow the online 

instructions for submitting comments. 

Instructions: All submissions received 

must include the Docket ID No. for this 

rulemaking. Comments received will be 

posted without change to https://

www.regulations.gov/, including any 

personal information provided. For 

detailed instructions on sending 

comments and additional information 

on the rulemaking process, see the 

‘‘Written Comments’’ heading of the 

SUPPLEMENTARY INFORMATION section of 

this document. 

FOR FURTHER INFORMATION CONTACT: Jed 

D. Wolkins, Environmental Protection 

Agency, Region 7 Office, Air Quality 

Planning Branch, 11201 Renner 

Boulevard, Lenexa, Kansas 66219; 

telephone number: (913) 551–7588; 

email address: wolkins.jed@epa.gov. 

SUPPLEMENTARY INFORMATION: 

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

and ‘‘our’’ refer to the EPA. 

Table of Contents 

I. Written Comments 

II. What is being addressed in this document? 

III. What is General Conformity? 

IV. Have the requirements for approval of a 

SIP revision been met? 

V. What action is the EPA taking? 

VI. Environmental Justice Concerns 

VII. Incorporation by Reference 

VIII. Statutory and Executive Order Reviews 

I. Written Comments 

Submit your comments, identified by 

Docket ID No. EPA–R07–OAR–2022– 

0482, at https://www.regulations.gov. 

Once submitted, comments cannot be 

edited or removed from Regulations.gov. 

The EPA may publish any comment 

received to its public docket. Do not 

submit electronically any information 

you consider to be Confidential 

Business Information (CBI) or other 

information whose disclosure is 

restricted by statute. Multimedia 

submissions (audio, video, etc.) must be 

accompanied by a written comment. 

The written comment is considered the 

official comment and should include 

discussion of all points you wish to 

make. The EPA will generally not 

consider comments or comment 

contents located outside of the primary 

submission (i.e., on the web, cloud, or 

other file sharing system). For 

additional submission methods, the full 

EPA public comment policy, 

information about CBI or multimedia 

submissions, and general guidance on 

making effective comments, please visit 

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

commenting-epa-dockets. 

II. What is being addressed in this 

document? 

The EPA is proposing to approve the 

rescission of Missouri’s General 

Conformity Rule, 10 CSR 10–6.300 from 

Missouri’s SIP. General Conformity 

ensures actions taken by federal 

agencies, such as airport construction, 

do not interfere with a state’s plans to 

attain and maintain national standards 

for air quality. After rescission of the 

state’s General Conformity Rule, federal 

agency actions will be subject to the 

Federal General Conformity Rule. 

III. What is General Conformity? 

The purpose of the General 

Conformity rule is to ensure that federal 

activities do not cause or contribute to 


khammond on DSKJM1Z7X2PROD with PROPOSALS