## Response s to Significant Comments on the State and Tribal Designation Recommendations for the 2008
Ozone National Ambient Air Quality Standards (NAAQS)

Docket Number EPA

- HQ

- OAR

- 200 8

- 04 76 U.S. Environmental Protection Agency

April 2012R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 2 of 103 Tabl e of Contents List of Acronyms

................................ ................................ ................................ ................ 3

1.0 Introduction

................................ ................................ ................................ .............. 5

2.0 Background

................................ ................................ ................................ .............. 5

3.0 Responses to Significant Comments on the State and Tribal Designation Recommendations for the 2008 Ozone National Ambient Air Quality Standards (NAAQS)

................................ ................................ ................................ ............................ 7

3.1 General Issues

................................ ................................ ................................ ...... 7

3.1.1. Consideration of 2011 Data

................................ ................................ .......... 7

3.1.2. Super

- Regional Areas

................................ ................................ ................... 8

3.1.3. Meteorology

................................ ................................ ................................ 13

3.1.4. Tribal Considerations

................................ ................................ .................. 14

3.1.5. Other General I ssues

................................ ................................ ................... 14

3.2 Area

- Specific Issues

................................ ................................ ........................... 16

3.2.1. EPA Region I

................................ ................................ .............................. 16

3.2. 2. EPA Region II

................................ ................................ ............................. 17

3.2.3. EPA Region III

................................ ................................ ........................... 17

3.2.3.1. Baltimore, MD and Washington, DC

- MD

- VA

................................ ....... 17

3.2.3.2. Philadelphia

- Wilmington

- Atlantic City, PA

- NJ

- MD

- DE

....................... 30

3.2.3.3. Pittsburgh

- Beaver Valley, PA

................................ ................................ . 35

3.2.4. EPA Region IV

................................ ................................ ........................... 38

3.2.4.1. Atlanta, GA

................................ ................................ ............................. 38

3.2.4.2. Charlotte

- Rock Hill, NC

- SC

................................ ................................ ... 42

3.2.4.3. Knoxville, TN

................................ ................................ .......................... 46

3.2.4.4. Greensboro

- Winston

- Salem

- High Point, NC

................................ .......... 48

3.2.4.5. General Co mments in South Carolina

................................ ..................... 48

3.2.5. EPA Region V

................................ ................................ ............................. 49

3.2.5.1. Chicago

................................ ................................ ................................ .... 49

3.2.5.2. General Comments in Wisconsin

................................ ............................ 49

3.2.5.3. General Comments in Michigan

................................ ............................. 50

3.2.6. EPA Region VI

................................ ................................ ........................... 51

3.2.6.1. Dallas

- Fort Worth, TX

................................ ................................ ............ 51

3.2.6.2. Houston

- Galveston

- Brazoria, TX

................................ ........................... 63

3 .2.7. EPA Region VII

................................ ................................ .......................... 68

3.2.8. EPA Region VIII

................................ ................................ ......................... 68

3.2.9. EPA Region IX

................................ ................................ ........................... 77

3.2.10. EPA Region X

................................ ................................ ............................. 94

3.2.11. Multi

- Region Areas

................................ ................................ .................... 94

3.2.11.1. Memphis, TN

- MS

- AR

................................ ................................ ............ 94

3.2.11.2. St. Louis

- St. Charles

- Farmington, MO

- IL

................................ ............ 100

3.2.11.3. Cincinnati, OH

- KY

- IN

................................ ................................ .......... 102R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 3 of 103 

### List of Acronyms

APCD Air Pollution Control District AQS Air Quality System
CAA Clean Air Act
CBSA Core Based Statistical Areas
CAMD US EPA’s Clean Air Markets Division
CFR C ode of Federal Regulations
CSA Combined Statistical Area
CSPAR Cross

- state Air Pollution Rule
DFW Dallas

- For t Worth, Texas
EGU Electric Generating Unit
EPA Environmental Protection Agency
FR Federal Register
GA EPD Georgia Env ironmental Protection Division
HGB Houston

- Galveston

- Brazoria , Texas
HYSPLIT Hybrid Single Particle Lagrangian Integrated Trajectory Model
IEPA Illinois Enviro nmental Protection Agency
I/M (Vehicle) Inspection and Maintenance
LAER Lowes t Achievable Emission Rate
LRBOI Little River Band of Ottawa Indians
MACT Maximum Achievable Control Technology MDEQ Mississippi Depar tment of En vironmental Quality
MPO Metropolitan Planning Organization
MSA Metropolitan Statistical Area
NESHAP National Emission Standards for Hazardous Air Pol lutants
NAA Nonattainment Area NAAQS National Ambient Air Quality Standard
NEI National Emissions Inv entory NFR Notice of Final Rulemaking
NLLJ Nocturnal Low Level Jet
NOAA National Oceanic and Atmospheric Administration
NOx Oxides of Nitrogen
NSPS New Source Performance Standards
NSR New Source Review OAQPS EPA Office of Air Quality Planning and Standards
OMB Offic e of Management and Budget
OTR Ozone Transport Region
PPB Parts P er B illion
PPM Parts Per Million
PSD Prevention of Significant Deterioration QAPP Quali ty Assurance Project Plan QA/QC Quality Assurance/Quality Control
RACT Reaso nably Available Control Technology
RFP Reasonable Further Progress
RICE Reciprocating In ternal Combustion EngineR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 4 of 103 SC DEHC South Carolina Department of Health and Environmental Control
SIP State Implementation Plan
SLAMS State and Local Air Monitoring Stations Stage II Stage II gasoline vapor recovery (mobile sources)
TAZ Transportation Analysis Zone TCEQ Texas Commission on Environmental Quality
TPY Tons p er Year
TSD Technical Support Document
TVA Tennessee Valley Authority
UGRB Upper Green River Basin
VMT V ehicle M iles Traveled
VOC V olatile Organic C ompoundsR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 5 of 103 

### 1.0 Introduction

This document, together with the preamble to the final rule

, and the Technical Support Documents (TSDs) for the designations, presents the responses of EPA to the significant comments we received on our proposed designations. The responses presented in this document are intended to augment the responses to comments that appear in the preamble to the final rule and the TSD or to address comments not discussed in those
documents.



### 2.0 Background

On March 12, 2008, the Environmental Protection Agency (EPA) revised the N ational
A mbient A ir Q uality S tandards (NAAQS) for ozone to provide increased protection of public health and welfare from ozone pollution . The EPA l owered the primary 8

- hour ozone standard from 0.08 parts per million (ppm) to 0.075 ppm to protect against health effects associated with ozone exposure, including a range of serious respiratory illnesses and increased premature death from heart or lung di sease. The EPA revised the secondary
8

- hour ozone standard, making it identical to the primary standard, to protect against welfare effects, including impacts on sensitive vegetation and forested ecosystems.

History shows us that better health and cleaner air go hand

- in

- hand with economic growth. Working closely with the states and tribes, the EPA is implementing the 2008

ozone standards using a common sense approach that improves air quality and minimizes the burden on state and local governments. As part of this routine process, the EPA is working with the states and tribes to identify areas in the country that meet the standards or do not have data indicating whether they meet the standards and those that need to take steps to reduce ozone pollution to a ddress unhealthy air quality . Within one year after a new or revised air quality standard is established, the Clean Air Act (CAA) requires the Governor of each state to submit to the EPA a list of all areas in the state, with
recommendations for whether ea ch area meets the standard. As a first step in implementing the 2008 ozone standards, the EPA asked states to submit their designation recommendations, including appropriate area boundaries, by March 12, 2009. In September 2009, the EPA announced it was re considering the 2008 ozone standards. The EPA later took steps to delay by one year the designation process for the 2008 ozone
standards to allow completion of the reconsideration process . However, in September 2011, the Office of Management and Budget ret urned to the EPA the draft final rule addressing the reconsideration of the 2008 ozone standards

. O n September 22, 2011, the EPA restarted the implementation effort by issuing a memorandum outlin ing plans for moving forward to implement the 2008 ozone stan dards . The EPA indicated that it would proceed with initial area designations for the 2008 standards, and planned to use the recommendations states made in 2009 as updated by the most current, certified air quality
data from the years 2008 through 2010. Wh ile the EPA did not request that states or tribes submit updated designation recommendations, the EPA provided the opportunity
for them to do so.

On December 9 , 2011

, the EPA sent letters to state and tribal representatives responding
to their recommend ations and identifying those areas anticipated to be designated asR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 6 of 103 meet ing the 2008 ozone standards or not having sufficient air quality to support whether the area is meeting the standard and those that do not . States

, tribes , and the public ha d the oppor tunity to c omment on the EPA’s proposed decisions before the agency issues final area designations , and to provide new information and analyses to the EPA

, if appropriate. Following are summaries of significant comments received on the 2008

ozone designati on recommendations and the EPA’s responses to those comments

.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 7 of 103 

### 3.0 Responses to Significant Comments on the State and Tribal Designation Recommendations for the 2008 Ozone National Ambient Air Quality Standards (NAAQS)

The following sections address the state, tribal, and public comments received by the
EPA on the state and tribal ozone designation recommendations for the 2008 Ozone NAAQS. Comment summaries and responses are presented below. EPA has provided additional detail for specific nonattainment areas in the Technical Support Document (TSD) for that area. Commenters can find TSDs in the electronic docket for this action (www.regulations.gov, docket number EPA

- HQ

- OAR

- 2008

- 0476) and at EPA’s Ozone Designations Web Page (www.epa.gov/ozonedesignation s).

3.1 General Issues

3.1. 1

. Consideration of 2011 Data

Comment: Several commenters said EPA should designate areas based on 2009

- 2011 air quality monitoring data, noting that states are required to submit certified ozone air quality data by May 1, 2012.

EPA Response: The EPA is basing these final designations primarily on air quality monitoring data for the 2008

- 2010 time period because this was the most recent certified data available in early December 2011 at the time EPA notified states of any i ntended revisions to the states’ designation recommendations. Under 40 CFR part 58.15(a)(2) regarding the deadline for annual air monitoring certification, states are required to submit the certified 2011 air quality monitoring data by May 1, 2012 and thus states generally had not submitted such data at the time EPA notified states. Moreover, such data if submitted on May 1, 2012, would not be available in sufficient time for the EPA to complete the 120

- day notice process required by the CAA prior to the E PA’s deadline for designating areas pursuant to a Consent Decree. S ee WildEarth Guardians v. Jackson (D. Ariz. No. 2:11

- CV

- 1661). In certain cases, states included as part of their designation recommendation a request that EPA consider monitoring data fro m 2009

- 2011 in making final designation decisions, indicated to EPA what they anticipated that certified data would show regarding whether an area was attaining the standard, and committed to certifying their 2011 data earlier than required for designation purposes. Thus, for those areas, EPA considered the information submitted by the state in sending the 120

- day notification letter. Additionally, in the letters responding to these states’ recommendations, EPA indicated that for the EPA to be able to cons ider 2011 air quality monitoring data, the state must submit the certified 2011 data for an area by February 29, 2012. EPA established this deadline for states to submit any additional information to ensure that the agency would have adequate time to evalu ate the new technical
information and complete the interactive process between the EPA and the s tates, as contemplated by the Act, as it moved forward to determine the final designations.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 8 of 103 Comment: One commenter provided a list of areas that EPA’s ozone d esignation webpage indicated EPA did not intend to designate nonattainment, but which the commenter says have 2009

- 2011 design values above the standard or which do not have three years of data but which data indicate should still be designated nonattainme nt. Commenter noted that these areas should be designated as nonattainment.

EPA Response: For each of the areas the commenter identified as having a 2009

- 2011 design value above the standard

, t he EPA notes that the design values are not official design va lues because the air quality information on which the posted design values were based was not certified information. As provided in the previous response, we are relying on the most recent three years of certified data to designate areas for the 2008 ozon e NAAQS.

The commenter further identifies a second list of areas with incomplete three years of data but with preliminary data indicat ing nonattainment. For these areas the commenter provided calculations indicating a design value above the NAAQS. The E PA notes that
the commenter’s list of areas and calculated design values are based on an “estimated exceedances” form of the standard which includes an upward adjustment of the observed exceedances of the standard to account for missing data. The method us ed by the commenter to calculate these design values appears to be based on methods for the 1

- hour ozone NAAQS

, which was revoked by EPA in 2005 . See 40 CFR p art 50, Appendi x D . For the 2008 ozone NAAQS, this method is not applied for purposes of
accounti ng for missing data. As provided in 40 CFR p art 50, Appendix P: The primary and secondary O 3 ambient air quality standards are met at an ambient air quality monitoring site when the 3

- year average of the annual fourth

- highest daily
maximum 8

- hour average O 3 concentration is less than or equal to 0.075 ppm. This comparison shall be based on three consecutive, complete calendar years of air quality monitoring data. This requirement is met for the 3

- year period at a monitoring site if daily maximum 8

- hour av erage concentrations are available for at least 90% of the days
within the O 3 monitoring season, on average, for the 3

- year period, with a minimum data completeness requirement in any one year of at least 75% of the days within the O 3 monitoring season. Th us, the commenter’s suggestion “that there is no justification for applying an attainment designation” in areas where “the states failed to monitor for the minimum number of days required” is unwarranted, because each of the specific areas listed by the co mmenter have monitoring data for 2008

- 2010 showing attainment of the standard and meeting the minimum completeness requirements set forth in the March
2008 8

- hour Ozone NAAQS rulemaking.

3.1.2

. Super

- Regional Areas

Comment: Several commenters support t he request from some St ates (e.g., Maryland, Delaware, Connecticut, and the District of Columbia) to create a super

- regional
nonattainment area (i.e., large nonattainment area comprised of multiple states) that recognize s regional sources of pollution that contribute to nonattainment in the eastern
States. Commenters further recommended that EPA designate an entire collection of States as a large “super regional” multi

- state nonattainment area

, including a significantR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 9 of 103 portion of the eastern United States. E ach of the previously mentioned states submitted factor analyses to support a super

- regional nonattainment area. 1

EPA Response: The EPA does not believe that creation of a super

- regional nonattainment area to address pollution transport is the appropriate approach. As an initial matter, section 107(d)(1) provides that areas designated nonattainment should include any “nearby” area contributing to a violation of the NAAQS. We believe that broad super

- regional areas go beyond this by including areas that are not necessarily “nearby” but contribute to nonattainment through long

- range transport. The CAA has separate provisions in the Act to address this phenomenon. Section 110(a)(2)(D) requires states to address ozone transport that contributes to a violation o f the NAAQS in another State. In addition, section 184 , creates the northeast o z one transport region and also grants EPA authority to establish additional transport regions, as appropriate. Finally, we note that the approach taken by EPA is consistent wit h the approach Congress specified
for serious and above areas for the 1

- hour NAAQS, where in section 107 (d)(4)A)

, Congress set the CMSA boundaries as the presumptive boundaries of the nonattainment

area. In Catawba Co. v. EPA 2 , the Court upheld that “cont ribute” under §107(a)(1)(A) of the CAA does not necessarily mean “any contribution” to nonattainment but rather a degree of contribution sufficient to deem an area nonattainment, that is, sufficient enough to warrant designation as nonattainment. “Section 107(d) is ambiguous as to how EPA
should measure contribution and what degree of contribution is sufficient to deem an
area nonattainment ...” Catawba County v. EPA , 571 F.3d 20, 39 (D.C. Cir. 2009) (Internal citation omitted but with emphasis added)

. “Thus , reasonably exercising the discretion that Congress delegated to it, EPA interpreted “contribute” to mean “sufficiently contribute,” and then applied the C/MSA presumption and nine

- factor test precisely to identify those areas that meet that definition.” Id.

EPA’s analyses supporting boundaries for individual nonattainment areas are provided in the TSD for the area in question.

Comment: One commenter suggested that the EPA should create a large, regional
nonattainment area based on EPA’s own findings and publicly solicited proposals.

EPA Response: As noted in the previous response, other provisions of the Act address longer

- range ozone transport and the designation process requires only that “nearby” areas that contribute to violations of the NAAQS be inc luded as part of the nonattainment

area.

1 See document numbers EPA

- HQ

- OAR

- 2008

- 0476

- 0123, EPA

- HQ

- OAR

- 2008

- 0476

- 0125, EP A

- HQ

OAR

- 2008

- 0476

- 0490, EPA

- HQ

- OAR

- 2008

- 0476

- 0518, EPA

- HQ

- OAR

- 2008

- 0476

- 0539 from Delaware, Connecticut, Maryland, and the District of Columbia in the ozone designations docket EPA

- HQ

- OAR

2008

- 0476.

2 Catawba County v. EPA , 571 F.3d 20, (D.C. Cir. 2009)R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 10 of 103 Comment : One commenter suggested that the EPA ’s designation of nonattainment areas should include all the counties within any metropolitan statistical area, consolidated metropolitan statistical area, or combined s tatistical area if any county in that area fails to
attain the subject NAAQS

. EPA Response: Consistent with the approach Congress adopted in 1990 for areas classified as serious or higher for the 1

- hour ozone NAAQS, EPA recommended to states that they us e (and EPA indicated in guidance that it would use) Core Based Statistical Areas (CBSAs) or Combined Statistical Areas (CSAs) as a starting point or “presumptive” boundary for considering the geographic boundaries for ozone
nonattainment area for the 2008 ozone NAAQS. This “presumptive” boundary could be adjusted to either include additional areas or exclude areas based on EPA ’s analysis of nine factors, later consolidated to five factors, to evaluate nearby contribution to the violating monitors. 3 EPA beli eves that factor analysis is a logical way of assessing nearby
contribution and thus determining whether specific areas should included as part of the designated nonattainment area. Including all counties within the metropolitan statistical area, consolida ted metropolitan statistical area, or combined statistical area would not give proper weight to these considerations

.

Delaware Comment: EPA’s methodology does not consider the air quality in any county
that does not have an ozone monitor. Counties without monitors that are adjacent to counties with violating monitors should be designated as nonattainment, and counties adjacent to those counties should be included in EPA’s contribution analysis.

EPA Response: EPA disagrees with the commenter that EPA’s met hodology does not consider air quality in counties without ozone monitors. As stated in the previous

response, EPA uses CBSA or CSAs as a starting point or “presumptive” boundary for considering the geographic boundaries for ozone nonattainment area for t he 2008 ozone NAAQS and recommended that states use this same approach when developing and submitting their recommendations to EPA

. Many counties in a CSA/CBSA do not have ozone monitors, but are included in EPA’s factor analysis to evaluate nearby contrib ution to the violating monitors. EPA refers the commenter to the TSDs for this action, specifically Dallas

- Fort Worth, TX and Atlanta, GA, for examples of where EPA followed the methodology identified by the commenter.

Comment: The state of Maryland and the District of Columbia (the District), as well as

o ne public commenter

, suggested that the Baltimore MD and the Washington, DC

– MD

VA areas be combined into one nonattainment area as they represent one recognized and interconnected, consolidated metropoli tan area.

3 EPA has used area

- specific analyses to support nonattainment area boundary recommendations and final boundary determinations by evaluating factors such as air quality data, emissions data, population density and degree of urbanization, traffic and commuti ng patterns, meteorology, and geography/topography.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 11 of 103 EPA R esponse: EPA recognizes that the Baltimore and Washington DC areas are part of one large CSA and evaluated whether to create one larger nonattainment area o r whether to designate the areas as separate nonattainment areas as it had done for both the 1

- hour and 1997 ozone NAAQS. While many of the factors EPA considered would support creating one large nonattainment area, we ultimately relied on the jurisdictional boundar y (e.g., counties, air districts, existing nonattainment areas, Reservatio ns, metropolitan planning organizations (MPO’s)) factor to keep these two areas as separate nonattainment

areas

. We note that Maryland and Washington DC both supported creating one large nonattainment area while Virginia supported creating two separate are as. Where all areas will be designated nonattainment, EPA gives greater weight to s tates’ preferences in how to establish the boundaries for one or more nonattainment areas. Because it is important
for all s tates that are part of a multi

- state area to work well together, we gave weight to the historical fact that these areas have not had to work together to address nonattainment issues and the fact that Virginia was opposed to being included in a broader area. We believe designating these areas as separate areas will reduc e the burden on state and local governments, which have organizations such as their MPOs in place, but would have to reconfigure such organizations for a larger area. However, we note that over the years the Washington

- Baltimore area has be come more integrated and for any future NAAQS we may determine that there is a greater need to designate these areas as one large area. We plan to work with the s tates to assist efforts to address ozone pollution for these two areas and to encourage cooper ative efforts among the states and the District of Columbia

Delaware Comment: Delaware noted t hat EPA ’s intended approach for the three

cou nties in Delaware (i.e., New Castle County in cluded as part of the Philadelphia nonattainment area; Sussex County to comprise the Seaford, DE nonattainment area; and Kent County as a separate unclassifiable/attainment area) subject s Delaware, the second smallest state in the nation, to three different sets of State Implementation Plan (SIP)

re quirements, without a ba sis that the approach would assist Delaware in attaining and maintaining the NAAQS. Delaware also asked the following three questions in their

comments:

• How does EPA’s common sense approach improve air quality?

• How does EPA’s common sense approach minimiz e the burden on Delaware?

• How does EPA’s common sense approach identify areas in the country that need to take steps to reduce ozone pollutants?

EPA Response: In March 2009, the State of Delaware recommended a large, multi

- state nonattainment area, coveri ng the entire States of Delaware, Maryland, Michigan, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Virginia, and West Virginia, plus the District of Columbia. Alternatively, Delaware recommended that the entire State of Delaware be designated as a stand

- alone nonattainment area. In October 2011, Delaware updated its recommendations to expand its recommended large multi

- state nonattainment
area to include those previously identified plus the s tates of Kentucky, Indiana, Illinois, Missouri, Tenne ssee, and Wisconsin. In addition, in its October 2011 letter, Delaware specified that if EPA did not accept either of its designation options, then EPA should not designate Kent County as nonattainment.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 12 of 103 For the reasons provided previously, EPA is not desig nat ing a super

- regional
nonattainment area. Other provisions in the Act address long

- range transport from one
state to another.

In its 120

- day letter and the associated Delaware technical support document ( TSD ), EPA proposed that the Philadelphia nonatta inment area include 16 counties in Delaware, Maryland, New Jersey, and Pennsylvania as nonattainment for the 2008 ozone NAAQS

. EPA identified New Castle C ounty, Delaware as a near by

, contributing county to the Philadelphia nonattainment area. Because of a violating monitor in the Seaford micro area in Sussex County, EPA also identified the Seaford area as nonattainment. EPA
further accepted the Delaware recommendation that Kent County should not be designated nonattainment because it has limited contribut i on to the Seaford area and to the Philadelphia area.

EPA through the regional staff and in communication with state staff attempted to propose in the 120 letter areas that minimized the burden on Delaware while also ensure that all appropriate areas were d esignate d nonattainment

. The TSD for the Delaware area fully explains the basis for EPA’s decisions regarding the three Delaware counties.

Maryland Comment: “Maryland’s 20 year ozone research program clearly shows through measured (not modeled) monitori ng data, that ozone is being transported into Maryland from upwind states at levels already above the 75ppb ozone standard

. ”

EPA R esponse: Issues related to the long

- range transport of ozone and its precursors are not appropriate for the designation proce ss. However, EPA acknowledges that a large part of the ozone problem for eastern states like Maryland, Delaware, and others is due to long range transport of ozone that comes from upwind states in the mid

- west and south.
The Cross

- State Air Pollution Rule (currently stayed by the court) is a federal program that will reduce ozone and PM precursors regionally, and provide air quality benefits to downwind states. Other national rules that address SO2 and NOx will provide additional benefits. EPA recognizes that these states have aggressively pursued control measures for sources within their states. In the case of Baltimore, for example, while there are certainly local contributions to the ozone problem, EPA recognizes that a significant portion of the air qu ality problems come from outside the urban area.

Maryland and Washington, DC Comment: Questions from b oth ag encies ask in the

“ real world timeframe for policy and regulation development and pollution control design and installation, how current EPA effo rts and other provisions of the Clean Air Act could possibly allow Maryland, Connecticut, Delaware and [Washington, DC ( the District )] t o attain the 75 ppb standard by the attainment dates mandated in the Act.”

EPA Response: T he Clean Air Act sets the time line s for attainment of the NAAQS. EPA’s analyses of whether areas are likely to attain the 2008 NAAQS by the attainment date for the area’s classification is in the docket for that rulemaking (see docket number
EPA

- HQ

- OAR

- 2010

- 0885)

.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 13 of 103 Delaware Comment: Delaware commented that downwind nonattainment areas that have already controlled their emission sources are unfairly burden, compared to upwind areas. Delaware further commented that these nonattainment areas will have trouble attaining. Delaware also qu estioned how Delaware can use CAA sections 110(a)(2)(D), 126, and 184 to help its nonattainment areas attain the 2008 8

- hour ozone NAAQS within the time
frames set out in the CAA.

EPA Response: EPA expects continuing reductions of emissions that form ozo ne over broad regions due to federal measures already completed including rules controlling emissions from power plants such as the Cross

- State Air Pollution Rule (currently stayed by the court) and the Mercury and Air Toxics Rule; and reductions from both onroad cars and trucks and nonroad engines as older engines and vehicles are being replaced by

n ewer, cleaner engines. EPA will continue to consider the potential impacts of transported pollution to states' ability to attain the standard and we will work with states on challenges to attaining the standard where transported pollution may be an issue.

3.1. 3

. Meteorology

Comment: Several commenters state that

, although longer

- range transport can affect concentrations in downwind areas, the us e of wind roses to determine transport linkages
and contributions is inconsistent with current science.

EPA Response: Meteorological analyses address only one of several factors that must be considered in determining designation boundaries. The adequacy of a particula r meteorological analysis cannot be determined generically, but must be determined as one part of the multi

- factor process used for each individual region under consideration. However, EPA agrees that using wind roses as the sole indicator of atmospheric transport is not the preferable approach because using additional analyses may provide a more comprehensive assessment of regional wind flow patterns. Many of the meteorological analyses conducted as part of this portion of the boundary determination did use more sophisticated techniques (e.g., trajectory analyses) to better assess potential transport patterns. In those cases where timing constraints and the lack of additional information prevented a more detailed assessment, EPA believes that the default wind rose analyses, in conjunction with the remainder of the multi

- factor analysis, can provide an adequate assessment of appropriate boundaries.

Further, EPA agrees with the comment that regional and longer

- range ozone transport can affect concentration s in downwind areas. EPA has taken steps to reduce these contributions over the past decade (e.g., the NOx Budget Trading Program, the Cross

State Air Pollution Rule (currently stayed by the court) , various regulations on mobile source emissions, etc.) an d will continue to address regional ozone transport in the future as part of the overall effort to attain the NAAQS.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 14 of 103 Comment: Use of NOAA Single Particle Lagrangian Integrated Trajectory Model (HYSPLIT) was unsoundly applied for expanding the Houston and Dallas nonattainment areas. HYSPLIT does not calculate pollutant concentrations, the types of pollutants added along the transport path, dispersal rates along the transport path, or ozone formation rates that may result from different pollutant interacti ons. Further, HYSPLIT cannot provide evidence directly linking emissions from one area to ozone formation in
another area.

EPA Response: EPA agrees that the HYSPLIT wind trajectory model computes simple air parcel trajectories. EPA believes

, however, t hat simple trajectory analyses of local transport patterns on high ozone days, in conjunction with the remainder of the multi

factor analysis, can inform an adequate assessment of appropriate boundaries. EPA’s analysis supporting the boundaries for the Ho uston and Dallas areas, which was based on the full five factor analysis, is in the TSDs for those areas.

3.1.4

. Tribal C onsideration s

Comment: One commenter stated that EPA should give the jurisdictional boundaries factor (one of the five factors inclu ded in a multi

- factor analysis for the 2008 ozone standards) greater weight when considering tribal recommendations for separately designated areas of Indian country. The commenter cited EPA's new Policy for Establishing Separate Air Quality Designations f or Areas of Indian Country (December 20, 2011) and stressed the importance of following this policy for the ozone designations

process.

EPA Response: The jurisdictional boundaries factor is one of five factors that are being considered as part of the des ignations decision

- making process for ozone. EPA is carrying out its Policy for Establishing Separate Air Quality Designations for Areas of Indian Country to designate areas of Indian country for the 2008 ozone standards. The policy stresses the importanc e of recognizing tribal sovereignty and the jurisdictional status of Indian country in the decision

- making process. It also clearly articulates the circumstances under which the jurisdictional boundaries factor could bear more weight when evaluating a tri be's multi

- factor analysis.

3.1.5

. Other General Issues

Comment: Multiple commenters noted that the regulatory burden associated with EPA’s process of designating nonattainment areas will cause affected areas economic harm.

EPA Response: Under section 107(d) of the CAA, EPA is required to designate as nonattainment an area that is violating a new or revised national ambient air quality standard or that contributes to a nearby violation. EPA determines an ozone violation based on certified quality assu red monitoring data. Ozone is a regional pollutant and is readily transported both short and long distances. To determine whether a nearby area is contributing to a violation, EPA recommended that states conduct a technical analysisR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 15 of 103 based on a number of factors listed in the designation guidance for the 2008 ozone NAAQS, including air quality, emissions and emissions

- related data, meteorology, and geography/topography. In evaluating whether to modify a state’s designation recommendation, EPA also consider ed those factors. The justification for including [ ] in the [ ] nonattainment area is provided in EPA’s technical support document for the area. In determining whether an area should be designated nonattainment, EPA did not consider economic impacts bec ause that is not relevant for determining whether an included area is violating the NAAQS or is a nearby area that is contributing to a violation as provided under CAA section 107(d).

The implementation rulemaking for the 2008 ozone NAAQS will address the control obligations for areas designated nonattainment. As EPA considers the required elements of implementation for the 2008 ozone NAAQS, it is our goal to propose approaches that provide flexibility and opportunity for efficiency to the extent such app roaches are consistent with the CAA and will not jeopardize expeditious attainment of the public health and welfare goals of the CAA. In addition, we are exploring ways in which the EPA could provide assistance to the states. Finally, to the extent the CA A does not mandate specific control measures, states may consider economic concerns in development of their state implementation plans to address air quality.

Comment: A commenter contends that, if the EPA cannot support the creation of a

super

- regional nonattainment area, the EPA must at least not define the nonattainment areas too narrowly. A t minimum, the EPA should include all counties within any metropolitan statistical area, consolidated metropolitan statistical area, or combined
statistical area that includes any county that fails to attain the 2008 8

- hour ozone
standard.

EPA Response: S ection 107(d)(4)(A)(iv) and (v) address the use of statistical areas as the presumptive starting point for nonattainment area boundaries for serious, severe, and extreme areas. These provisions directly applied only for purposes of the initial designations for the 1

- hour standard at the time the CAA was amended in 1990. While these provisions do not directly apply to designations for a new or revised NAAQS und er section 107(d)(1), we have adopted the approach of using the OMB statistical area boundaries as a starting point for analyzing nonattainment areas for all areas designated nonattainment for both the 1997 NAAQS and now the 2008 ozone NAAQS. Although

we begin our analysis by looking at all counties within the relevant statistical area, in most cases the designated area is smaller because the five factor analysis that we perform (and that we encourage states to use for their recommendations) typically indi cates that there is not a strong basis to conclude that some of the counties or parts of counties within the statistical area contribute to violations of the NAAQS within the area. We believe that using the statistical areas as a starting point for our eva luation is a reasonable means to ensure that the “nearby” counties most likely to contribute to a violation of the NAAQS are evaluated and it also provides a consistent and certain starting point for evaluating areas across the country. Although we use the se statistical areas as the starting point, we believe it would be arbitrary and not consistent with the Congressional precedent we are relying on to mandate that all counties within such area must beR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 16 of 103 included as part of the nonattainment area. For purpos es of the 1

- hour standard in place at the time of the 1990 Amendments, Congress established the presumptive, but also provided an opportunity for the Governor of each state to provide technical information supporting the exclusion of areas within the stati stical area from the designated nonattainment area. Specifically, section 107(d)(4)(A)(v) provides that in the process of determining whether areas within the CSA should be excluded from the designated area,
the Governor and EPA “shall consider factors su ch as population density, traffic congestion, commercial development, industrial development, meteorological conditions, and pollution transport. These considerations are consistent with the 5

- factor analysis we apply.

Our 5

- factor analysis for each o f the counties in a given CSA is provided in the appropriate TSD.

3.2 Area

- Specific Issues

3.2.1. EPA Region I

Connecticut Comment : “EPA’s decision to maintain Connecticut’s current nonattainment boundaries, while procedurally practical, does nothing m ore than to safeguard the status quo. In responding to Connecticut’s super

- regional recommen dation,
EPA stated that it was ‘ using a common sense approach that improves air quality and
minimizes the burden on sta te and local governments.’ But the status quo maintained by EPA’s current approach does not address the existing and potentially worsening public health risks and economic burdens from transported pollution on downwind states like Connecticut. Further, as support for its decision, EPA stated that ‘ mo st of the states that Connecticut seeks to include as part of this large nonattainment area did not make a similar request. ’ It should come as no surprise to EPA that states unburdened by the requirements necessary to achieve and maintain ozone NAAQS compl iance are not themselves volunteering to be more stringently regulated. The CAA requirements with respect to the attainment of NAAQS are not predicated upon state consent. The science behind ozone transport speaks emphatically for the adoption of a regiona l approach, even when the states in Connecticut’s proposed region are silent. ”

EPA Response: As provided in our response in section 3.1.2, we believe other provisions of the Act more appropriately address the long

- range transport of pollution.

Comment: One commenter disagrees with EPA’s proposal and Massachusetts’ recommendation that EPA designate Dukes County, consisting of islands off the coast of
Massachusetts without sources of pollution , as an isolated nonattainment area. The
commenter asks that EP A reexamine the like l y source of the transported pollution that is impacting Dukes County and include the county in the appropriate larger nonattainment area, which “...appears to be the greater New York

- Newark

- Bridgeport, NY

- NJ

- CT

- PA
area.”R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 17 of 103 EPA Response: E PA’s five factor analysis for the Dukes County nonattainment area

, presented in more detail in the area TSD, supports EPA’s designation of the county alone as the nonattainment area. Although, transported ozone likely influences the air quality in
Dukes Co unty , as discussed in greater detail in section 3.1.2, other provisions of the Act address longer

- range ozone transport and the designation process requires only that “nearby” areas that contribute to violations of the NAAQS be included as part of the

nona ttainment area. In addition, if EPA where to include Dukes County in the New
York

- N. New Jersey

- Long Island, NY

- NJ

- CT nonattainment area, the “larger” area would be a discontinuous area, since it would not include any portion of Rhode Island,
which is in between New York and Dukes County. EPA strongly discourages
discontinuous nonattainment areas.

3.2.2. EPA Region II

Comment: One commente r asked that EPA designate all of the Allentown, PA CSA area as nonattainment, including Warren County, NJ . Wa rren County was previously part of
the CSA that includes New York City, but the latest OMB classification includes the county in the Allentown MSA.

EPA Response : New Jersey requested in their recommendation to EPA that EPA
continue to include Warren Cou nty, NJ in the New York

- N. New Jersey

- Long Island,
NY

- NJ

- CT (New York) nonattainment area. EPA agrees with New Jersey’s request and
refers the commenter to the New York TSD

. The commenter makes no argument supporting re

- aligning N ew Jersey ’s proposed non attainment boundaries.

Comment: Two commenter s contend that, if the EPA cannot support the creation of a

super

- regional nonattainment area, the EPA must at least not define the nonattainment areas too narrowly. A t minimum, the EPA should include all c ounties within any metropolitan statistical area, consolidated metropolitan statistical area, or combined statistical area that includes any county that fails to attain the 2008 8

- hour ozone
standard. Specifically, the commenters request that EPA include D utchess, Orange, Putnam and Ulster Counties in the New York City nonattainment area.

EPA Response: Dutchess, Orange, Putnam and Ulster Counties are part of the New York

- Northern New Jersey

- Long Island, NY

- NJ

- CT

- PA C SA

. As such, EPA included these
counti es in its five

- factor analysis for the New York nonattainment area , the details of which are presented in the area TSD. EPA’s five factor analysis for the New York
nonattainment area indicated that inclusion of the identified counties in the New York

area is not warranted.

3.2. 3

. EPA Region III

3.2.3.1. Baltimore, MD and Washington, DC

- MD

- VAR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 18 of 103 T

he District Comment : The District understand s that certain counties and cities in the
CSA

, but not within either the current Baltimore or Washington DC

- M D

- VA oz one nonattainment areas under the 1997 ozone standard

, are in the Ozone Transport Region (OTR)

. T he District qualified its statement by stating the District is not clear on whether Virginia and West Virginia counties and cities that are not in the Washing ton DC

- M D

VA nonattainment area are technically still part of the OTR. The District identified these counties and cities as: Queen Anne's and St. Mary's Counties in Maryland ; the Counties of Clark, Culpeper, Fauquier, Frederick, Spotsylvania, Stafford and Warren and the Cities of Fredericksburg and Winchester in Virginia; and, Jefferson and Hampshire Counties in West Virginia. Therefore the District assumed all of these may already comply with most nonattainment requirements of CAA §184, and these jurisdi ctions need to implement the major source Reasonably Available Control Technology ( RACT ) and
vehicle inspection and maintenance ( I/M ) programs

.

EPA Response : The EPA interpret s the scope of section 184(a) to include only those states specified by name : the District of Columbia and those portions of other States
which shared the same statistical area as the District as of November 15, 1990 . See for example, 40 CFR 51.120 (60 FR 4712, Jan. 24, 1995) which related to a SIP call on all
the OTR States.

There fore, with respect to Maryland , since all of Maryland is in the OTR, Queen Anne's and St. Mary's Counties are in the OTR established under CAA section 184(a).

With respect to Virginia, only the Counties of Arlington, Fairfax, Loudoun, Prince
William and Stafford and the Cities of Fairfax, Falls Church, Manassas, Manassas Park, and Alexandria are in the OTR established under CAA section 184(a).

No counties in West Virginia are in this OTR.

The District Comment : The District advocate d a “super

- regional” nonattainment area boundary that encompasses all contributing states because such an area would get at the heart of the nonattainment in the District and throughout the OTR due to transport. The
District asserted that EPA should “... consider revisiting its interpretation or use of the

term ‘ nearby ’ to delineate nonattainment boundaries for the ozone NAAQS (i.e., such as one county out from a violating monitor, as EPA has typically used as a basis for whether or not to include a county in a nonattainment are a)

. ” The District further stated, “ I t is widely acknowledged that precursor emissions of ozone travel distances much farther than previously believed. ”

Additionally, t he District noted that in its comment submitted February 3, 2012 4

, that the
District s hares the concerns regarding ozone transport that lead the states of Maryland

, Connecticut, and Delaware to seek establishment of large nonattainment areas as a way to

4 See document number EPA

- HQ

- OAR

- 2008

- 0476

- 0448 in the ozone designations docket (EPA

- HQ

OAR

- 2008

- 0476).R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 19 of 103 ensure that upwind states are held accountable for their contribution to the high ozone levels that are measured throughout the Northeast and Mid

- Atlantic States. The District asserted that most of the areas upwind of the District would be classified as a "marginal" or an "attainment" area, which means that no additional controls would be re quired and that without additional controls to reduce transported pollution, it is unlikely that the District will achieve the 2008 ozone standard by the 2015 attainment date.

The District identified two groups of other s tates for which the District sta ted EPA’s
Cross

- State Air Pollution Rule showed contributed at least 74 percent or 56.6 ppb of a 76.9 ppb base case average, to the highest reading ozone monitor in the District. The first group were those that the CSAPR modeling showed had an individual contribution of at least 0.7 parts per billion (ppb) or at least one percent of the NAAQS. This group was identified as Illinois, Indiana, Kentucky, Maryland , Michigan, New Jersey, New York, Ohio, Pennsylvania, Tennessee, Virginia and West Virginia. The District claimed that the CSPAR modeling showed that the effect on the highest reading ozone monitor in the District could be in the range of49 parts per billion (Ppb) to 52 ppb. The District identified a second group for which the CSAPR modeling showed h ad an individual contribution of less than 0.7 parts per billion (ppb). The District said adding the total contribution of the second group to that of the first group results in the 74 percent and 56.6 ppb contribution. The second group of s tates consist ed of Alabama, Arkansas, Connecticut, Delaware, Florida, Georgia, Iowa, Kansas, Louisiana, Maine, Massachusetts, Minnesota, Mississippi, Missouri, Nebraska, New Hampshire, North Carolina, North Dakota, Oklahoma, Rhode Island, South Carolina, South Dakota, Texas,
Vermont and Wisconsin.

EPA Response: While we agree with the comment that EPA’s modeling shows long

range transport from a number of states distant from Washington DC, as provided in our response in section 3.1.2 , we believe other provisions of t he Act are the appropriate provisions to address this concern.

EPA does not agree with the District’s comment that because most areas upwind of the Washington, DC

- MD

- VA nonattainment area may be “attainment/unclassifiable” areas or “marginal” nonattainmen t areas there will not be additional reductions in such areas. Numerous EPA regulations for new motor vehicles and other on

- road and non

- road mobile source engines will continue to produce reductions in ozone and ozone precursors
in all areas of the count ry before the District of Columbia’s attainment date. See , 77 FR 8197 at 8202, February 14, 2012. In addition, States are required under CAA section 110(a)(2)(D) to submit SIPs to address ozone transport to other states. EPA has issued
several rules unde r that provision requiring States to address ozone transport. 5

5 "Federal Implementation Plans: Interstate Transport of Fine Particulate Matter and Ozone And C orrection of SIP Approvals

, " August 8, 2011; 76 FR 48208

.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 20 of 103 The District Comment : The District asserted that extending the nonattainment area boundaries beyond the current boundaries of the Washington, DC

- MD

- VA intended
nonattainment area to include b oth the Baltimore , MD nonattainment area and other nearby areas would create “regulatory parity” by extending the regulatory requirements
associated with a “moderate” nonattainment area to additional jurisdictions

. 6 Specifically,
the District notes that al l areas would be subject to demonstrating conformity of transportation plans under section 176 and would be required to implement the following measures under CAA section 182(b):

• Major source Reasonably Avail able Control Technology (RACT)

• New Source Rev i ew (NSR)

• Vehicle In spection and Maintenance (I/M)

• S tage II gasoline vapor recovery

The additional regulation in areas contributing to poor air quality in Washington, DC

MD

- VA would aid the District in achieving its air quality improvement goals for the
2 008 ozone NAAQS.

EPA Response: We agree with the commenter that all counties included as part of a nonattainment area that includes Harford County would be classified as moderate and would be subject to moderate area requirements such as those listed by the commenter. Our analysis supporting the boundaries for the Washington DC and Baltimore nonattainment areas is provided in the TSDs for those areas. We note that we typically do not consider the possible classification of an area for purposes of determi ning appropriate
boundaries.

The District Comment: In support of its position seeking a larger ozone nonattainment boundary than the Washington, DC

- MD

- VA area , the District cites the analyses presented in EPA's preliminary TSD for the District

. 7 The Dist rict notes that EPA’s analyses appear to indicate that Prince George's and Frederick Count ies in Maryland
could be included in either the Washington DC

- MD

- VA or the Baltimore nonattainment

area . The District claimed that because these 2 counties are both i n the Washington

Baltimore

- Northern Virginia, DC

- MD

- VA

- WV CSA, the y should also be in the same
nonattainment area

.

6 Given that the District desired that a single nonattainment area boundary comprising at a minimum of Washington

- Baltimore

- Northern Virginia DC

- MD

- VA

- WV CSA, the d e sign value for such an area w ould be set by the monitors in Harford County, MD. The highest 2008 to 2010 design value for Harford County was 0.089 ppm. This comment appears to be premised that the resulting classification would be moderate in accordance with the proposed classificat ion rule, 77 FR 8197, February 14, 2012.

7 Refer to Preliminary Technical Support Document, December 2011, entitled, District of Columbia Area Designations for the 2008 Ozone National Ambient Air Quality Standards, prepared by the Region 3 USEPA Supportin g & Related Material, item number EPA

- HQ

- OAR

- 2008

- 0476

- 0231 in the docket for

this action.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 21 of 103 In addition to jurisdictional considerations supporting a larger ozone nonattainment area,

t he District further suggests that E PA should pla ce more emphasis on the influence of the entire region's mobile sector emissions. The District interpreted that in the TSD accompanying the December 9 , 2011 letter from EPA "traffic and commuting patterns" were rarely mentioned as factors that influenced EPA's preliminary boundary decisions. The District reiterated that the mobile sector (on

- road and off

- road) is a major contributor to emissions in urban areas such as the Washington and Baltimore metropolitan areas and controls on the mobile sector provide local air quality benefit.

Finally, the District noted that the Metropolitan Planning Organization's (MPO) travel demand modeling recognizes the undeniable influence of mobile emissions from jurisdictions surrounding the region's current nonattainment ar eas. The District included a map that delineated this MPO’s regionally

- determined "model area"

– that of the transportation analysis zone (TAZ) used in air quality conformity assessments for the National Capital Region's transportation planning. The mode l area includes the current Washington DC

- MD

- VA ozone nonattainment area, Carroll, Howard and Anne Arundel Counties in the current Baltimore ozone nonattainment area and the following additional political subdivisions: St. Mary’s County in Maryland ; Clark e, Fauquier, King George, Stafford and Spotsylvania (only a portion) Counties and Fredericksburg City in Virginia; and Jefferson County in West Virginia. The District s tates that vehicle miles traveled (VMT) and the emissions from these “exurban counties” contrib ute to the National Capital Region's air quality.

EPA Response: EPA analyzes and weigh s the five factors in determining the appropriate
boundaries for a nonattainment area. EPA acknowledges that the Washington

- Baltimore

Northern Virginia DC

- MD

- VA

- WV CSA combines several CBSAs 8 indicating that there is commuting interchange among these CBSAs. To respond to the District’s March 12, 2012 letter, Maryland ’s March 7, 2012 letter and various comments received during the public comment period, EPA re

- ev aluated the five factors as they relate to designations under the 2008 ozone standard and the Washington

- Baltimore

- Northern Virginia DC

MD

- VA

- WV CSA. Based on this ana l ysis, EPA has separately designated as nonattainment Baltimore, MD and Washington, DC

- MD

- VA. EPA’s analysis is provided in the TSD for this area.

The District Comment : The District disagreed with EPA’s apparent interpretation of Maryland 's recommendation. The District stated that in Maryland ’s March 10, 2009

, 9
letter to EPA, Maryland stat ed that the existing nonattainment areas were recommended

8 Namely the following: Baltimore

- Towson, MD Metropolitan Statistical Area; Culpe p er, VA Micropolitan Statistical Area; Lexington Park, MD Micropolitan Statistical Area; Washington

- Arlington

Alexandria, DC

- VA

- MD

- WV Metropolitan Statistical Area; and the Winchester, VA

- WV Metropolitan

Statistical Area.

9 See document number EPA

- HQ

- OAR

- 2008

- 0476

- 0584 in the ozone designations docket ( [ EPA

- HQ

OAR

- 2008

- 0476).R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 22 of 103 "if EPA is confident that strong national rules will be in place three years in advance of Maryland 's attainment date;" otherwise, the District said in the alternative, Maryland advocated for a larg e regional nonattainment area. The District particularly cited EPA's weight on Maryland 's recommendations for a couple of counties (Prince George's County and Frederick County) in light of EPA’s analyses in the preliminary TSD 10 which appear
to indicate th at these two counties could be included as part of at least two different
nonattainment areas.

EPA Response: EPA responded to Maryland ’s recommendation that was contingent upon the existence of “strong national rules” at some time after the designations are issued. As EPA explained in more detail on pages 3 and 4 of its p reliminary TSD 11 for our December 9, 2011 letter to Maryland 12 , EPA believes that designation of nonattainment area boundaries cannot be predicated upon the likelihood of future control

m easures

.

Normally EPA gives great weight to a s tates’ recommendation in situations where the
issue is which nonattainment area in which to include a county or city and where consideration of the pertinent multi

- factor analysis does not dictate modific ation of the State’s recommendation. “First, relying on the primary emphasis it gives to ‘the recommendations made by States for the areas within their borders,’ ...” “[EPA] points out that New Jersey supported transferring Ocean County to the Philadelphia
nonattainment area while Maryland opposed transferring Cecil County to Baltimore. As EPA observes, the CAA gives great deference to governors’ recommendations for areas within their states, providing only that EPA ‘ may ’ make any modifications it ‘deems

ne cessary.’ 42 U.S.C. § 7407(d)(1)(B)(ii).” See

, Commonwealth of Pennsylvania v. EPA (429 F.3d 1125 ) (DC Cir. 2005) (emphases in original). In considering Maryland ’s March 10, 2009, recommendations, EPA notified Maryland in its December 9, 2011,
letter that EPA intended to modify its recommendations: EPA stated it did not agree with
the recommendation for a large regional nonattainment area encompassing a significant portion of the U.S. East Coast and could not predicate its decision of the likelihood of
fut ure control measures. As the District noted, EPA’s analyses in the preliminary TSD 13

10 Refer t o Preliminary Technical Support Document, December 2011, entitled, District of Columbia Area Designations for the 2008 Ozone National Ambient Air Quality Standards, prepared by the Region 3 USEPA Supporting & Related Material, item number EPA

- HQ

- OAR

- 2008

- 0 476

- 0231 in the docket for

this action.

11 Preliminary Technical Support Document, December 2011, entitled, Maryland Area Designations for the 2008 Ozone National Ambient Air Quality Standards, prepared by the Region 3 USEPA Supporting &
Related Material, i tem number EPA

- HQ

- OAR

- 2008

- 0476

- 0235 in the docket for this action.

12 Item number EPA

- HQ

- OAR

- 2008

- 0476

- 0234 in the docket for this action.

13 Refer to Preliminary Technical Support Document, December 2011, entitled, District of Columbia Area Designations fo r the 2008 Ozone National Ambient Air Quality Standards, prepared by the Region 3 USEPA Supporting & Related Material, item number EPA

- HQ

- OAR

- 2008

- 0476

- 0231 in the docket for

this action.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 23 of 103 for several counties in Maryland which straddle the Baltimore and Washington ozone nonattainment areas for the 1997 ozone standard could well have placed each in one of
th e two areas proposed in our December 9, 2011 letter to Maryland . For those proposals, EPA gave weight to Maryland ’s March 2009 recommendations but also had to balance Maryland’s recommendation with that of Virginia, another State that would be affected by Maryland’s recommendation

. EPA’s basis for the boundaries it has drawn for the Washington DC and Baltimore nonattainment areas is provided in the TSDs for those

areas. 14

Maryland Comment: Maryland provided a 5

- factor analysis in support of its
recommendati on to designate a single nonattainment area comprising 17 States

.

EPA Response: For the reasons previously provided, we believe that the designation process is not the mechanism to address long

- range transport of ozone. We understand
the commenter’s conce rn about timely adoption and implementation of measures to address “significant contribution” and we are continuing to work with states to ensure that the interstate transport of ozone and ozone precursors is addressed as timely as possible.

EPA acknowl edges that a large part of the ozone problem for eastern states like the District of Columbia, Maryland, Delaware, and others is due to long range transport of ozone that comes from upwind states in the mid

- west and south. The Cross State Air
Pollution Ru le (currently stayed by the court) is a federal program that will reduce ozone and PM precursors regionally, and provide air quality benefits to downwind states. Other national rules that address SO2 and NOx will provide additional benefits. EPA recognize s that these states have aggressively pursued control measures for sources within their states. In the case of Baltimore, for example, while there are certainly local contributions to the ozone problem, EPA recognizes that a significant portion of the air quality problems come from outside the Baltimore, MD nonattainment area

.

M aryland Comment: M aryland disagrees with EPA’s view that a large multi

- state nonattainment area like the one suggested by Maryland , is “not in keeping with a plain reading of CAA § 107(d)” as it relates to contributions from “nearby areas.”

M aryland points to Commonwealth of Pennsylvania v. EPA (429 F.3d 1125 ) (DC Cir. 2005) and states that the court did not find that Delaware’s request for a large multi

- state nonattainment area ran ging from Virginia to Maine was prohibited by a plain reading of the Clean Air Act, but, rather, the court deferred to EPA's interpretation that the term “nearby” as it pertained to § 107 to require locally

- based nonattainment areas. M aryland
notes that in that same case, the court authorized EPA’s designation of a multi

- state nonattainment area consisting of portions of New Jersey, Pennsylvani a and Delaware.

14 Letter dated December 1, 2011 from Martin J. O'Malley, Governor o f Maryland, to Shawn M. Garvin, Regional Administrator USEPA Region 3, Recommending Revised area Designations for Maryland for the 2008 Ozone NAAQS, item number EPA

- HQ

- OAR

- 2008

- 0476

- 0492 in the docket for this action.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 24 of 103 For these reasons M aryland disagrees with EPA’s judgment in rejecting the designation of a large m ulti

- state nonattainment area comprised of states that significantly contribute
to nonattainment in Maryland and other East Coast states.

EPA Response: EPA has not suggested that the court’s decision in Commonwealth of Pennsylvania v. EPA would bar super

- r egional nonattainment areas. Rather, in that case, the court deferred to EPA’s interpretation of the Act. EPA interprets “nearby” in the
context of section 107 (d)(4)(A), which established the CMSA as the presumptive boundary for areas classified serious a nd above for the 1

- hour ozone NAAQS under the CAA as amended in 1990. As provided previously, Congress enacted specific provisions in the Act to address the problem of longer range transport from one state to another state
and we believe that the designat ion process is not the appropriate method for addressing long

- range transport

. We believe the situation noted by the commenter

– the designation of the Philadelphia
multi

- state area

– is not the same as the designation of a large multi

- state area

encomp assing a large swath of states from the Midsouth (Tennessee) and Midwest (as far west as Wisconsin) up through New England.

Maryland Comment: Maryland commented that recent policy decisions on air quality designations for Indian lands 15 undermines EPA ’s assertion that larger NAAs do not coincide with a plain reading of the CAA in regard to nearby areas. Maryland cited

“ Policy for Establishing Separate Air Quality Designations for Areas of Indian Country,” dated December 20, 2011. Maryland states that this policy memorandum refers to Indian tribal lands and adjacent state lands that are much larger than the state of Maryland . An example, the Navajo Nation is nearly the same size as the state of West Virginia

, 16 yet this policy memo uses the words “contr ibuting to non

- attainment in the adjacent area” when referring to tribal lands’ emissions.

EPA Response: EPA disagrees that the cited December 20, 2011 policy is inconsistent with EPA’s other views regarding use of section 107(d). The cited December 20, 2 011 policy guidance document covered designating areas of Indian country for all NAAQS including ozone. In that guidance EPA recognized tribal sovereignty in air quality matters affecting their Indian country. Nothing in that guidance precludes EPA from designating portions of one tribe’s contiguous Indian country differently just as nothing in the CAA section 107(d) precludes EPA from splitting up one political subdivision of a state into several areas of differing designations and in the case of ozone, different classifications. Such a split would be based upon a full multi

- factor analysis. For example, San Bernardino County, California is split between three areas under the 1997

15 20 Dec ember 2011 EPA Memorandum, Po licy for Establishing Separate Air Quality Designations for Areas of Indian Country

16 Maryland cited http://en.wikipedia.org/wiki/Navajo_Nation which gives an area of 71,0000 square kilometers (27, 425 sq mi). Last checked March 15, 2012. We s t Virginia’s land area is 24,038 sq mi. http://quickfacts.census.gov/qfd/states/54000.html , last checked March 15, 2012.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 25 of 103 ozone NAAQS: Part is in the “Los Angeles and San Bernardino Counties (W estern Mojave Desert), CA” moderate nonattainment area; part is in the “Los Angeles South Coast Air Basin, CA” extreme nonattainment area; and part is in the “Mojave Desert AQMD” attainment/unclassifiable area. San Bernardino County, CA covers a land area nearly as large as that of the State of West Virginia at 20,056 square miles. 17

Under this December 20, 2011 policy, EPA would consider a tribe’s formal recommendations and/or views during the consultation process for a separate area designation of their Indian country or for separate designations for portions thereof in the same manner EPA considers a state’s recommendations and views for separate area designations for portions of that state

– typically by county or county equivalent

– or for
division of a county

- equivalent among two or more separate areas with separate designations and classification. In short, because Indian country is no less divisible for designation purposes under section 107(d) than a state or than a county

- equivalent political sub division of a state, EPA disagrees that the cited December 20, 2011 policy is inconsistent with EPA’s other views regarding use of section 107(d).

Maryland Comment: Maryland notes that Sect ions 110(a)(2)(D), §126, and §176 and § 184 offer solutions to tra nsported pollution, “ if implemented in a timely manner ” but
states that these provisions have not eliminated the significant contribution to Maryland
nonattainment because “ these provisions are seldom implemented, or are not adequately implemented to elimi nate significant contribution in a timely manner. ” Maryland asserts
that EPA should exercise its responsibility under §110(a)(2)(D) to ensure that each upwind state has an approved State Implementation Plan (SIP) that promptly implements
full compliance wi th §110(a)(2)(D), or EPA should implement a Federal Implementation Plan (FIP) which satisfies that requirement. Maryland points out that s tate infrastructure
and interstate transport SIPs to achieve the new 75 ppb NAAQS for ozone were due by March 20, 2011 , and that “ not a single state has a fully approved §110(a)(2)(D) SIP ” but
that EPA’s September 22, 2011 guidance memo on designations for the 75 ppb standard
states that EPA does not intend to penalize states for late submittal of the SIPs. Maryland
belie ve s that EPA should move forward to fulfill all of its statutory obligations as quickly as reasonable and avoid further delay because EPA’s delayed implementation l eaves Maryland ’s recommendation for the large nonattainment area “ as the more immediate
and timely solution. ”

EPA Response: For the reasons provided above, we believe that the designation process is not the mechanism to address long

- range transport of ozone. We understand the commenter’s concern about timely adoption and implementation of measu res to address “significant contribution” and we are continuing to work with s tates to ensure that the interstate transport of ozone and ozone precursors is addressed as timely as possible.

17 See http://quickfacts.census.gov/qfd/states/06/06071.html , last checked April 6, 2012.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 26 of 103 Maryland Comment: If EPA continues to designate smaller nonatt ainment areas, the n Maryland believes that, at a minimum, EPA should designate the entire Washington

Baltimore Combined Statistical Area (CSA) as a single nonattainment area using its nine (or five) factor analysis. Maryland supplied a 5 factor analysis t o support this
recommendation.

EPA Response: EPA’s analysis supporting the designation of the Baltimore and Washington DC areas as two separate nonattainment areas is provided in the TSD for the
nonattainment areas within the Washington

- Baltimore

- Norther n Virginia, DC

- MD

- VA

WV CSA

. EPA considered much of the information and data supplied by Maryland. In an appendix to the TSD for this CSA, EPA provides a summary of Maryland’s 5 factor analysis and identifies the data which EPA could consider and that data which EPA could not consider and the reason(s) why not.

Maryland Comment: Maryland asserts that marginal nonattainment areas under the 2008 ozone NAAQS are unlikely to attain by 2015 due to a lack of needed reductions in ozone precursors. Maryl and states that modeling shows that large reductions will be needed to attain the 2008 ozone NAAQS and asserts that even EPA’s CSPAR modeling results support a conclusion that many marginal areas will not attain the 2008 ozone NAAQS in a timely manner. Ma ryland notes that marginal areas are not required to develop or submit an attainment demonstration and therefore have no incentive to adopt additional measures to ensure attainment by the marginal area attainment date. Maryland provided
its assessment of various national efforts to control NOx emissions for seven top source categories of NOx emissions and concluded that measures do little or nothing in time for nonattainment areas to achieve clean data starting in 2013 for “marginal” areas and 2015
for “mo derate” areas. Instead Maryland claims that designation of large, multi

- state nonattainment areas will ensure that upwind areas implement effective lower cost programs that have likely already been developed, tested, implemented, and refined, are
included in multi

- state efforts to attain air quality standards in downwind areas that are not able to reach attainment on their own, thereby focusing limited resources where they are most needed and that upwind and downwind areas implement the same controls,

crea ting equity for businesses in different locations and equity in their work.

EPA Response: To the extent that Maryland has concerns that any marginal nonattainment areas adjacent or those in close proximity to the Baltimore, MD
nonattainment area may not at tain on time, EPA disagrees that consolidating these into
one nonattainment area with the Baltimore , MD nonattainment area as the means to address interstate transport to such marginal nonattainment areas or the likelihood that current measures may not res ult in attainment. For the reasons previously provided, we believe that the designation process is not the mechanism to address long

- range transport of ozone. Rather , EPA believes the CAA prescribes a comprehensive scheme for attainment of a NAAQS which includes options for a voluntary reclassification and the remedy for failure to attain.

The likelihood that an area may or may not attain in a timely manner is not one of the factors EPA considers when designating nonattainment areas. The CAA specifies the remedial actions required for nonattainment areas that fail to attain by the statutorilyR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 27 of 103 required attainment especially in the case of ozone with the scheme found in section 181(b).

EPA has always cautioned s tates that for a marginal area that fail s t o attain on

- time could
leave the s tate with a very short timeframe to develop and implement the required plan elements for a moderate area. As early as 1992

, EPA stated with respect to the 1

- hour ozone NAAQS but the following is equally applicable today: “The EPA believes that marginal areas should carefully consider the consequences of not attaining by November 15, 1993 18 , and should take certain preliminary steps to minimize the potential of being subject to possibly unnecessary major control and planning actions. ” See, 57 FR 13498 at 13507, April 16, 1992 (footnote added for clarity) . And also, “EPA, therefore, encourages any area that believes that it will be unable to attain by its applicable deadline, to voluntarily bump

- up early enough to maximize th e available time for implementing the requirements of the next higher nonattainment level. Early bump

- up will help areas avoid sanctions and/or FIP implementation that could result from failure to meet SIP submittal or implementation requirements.” See, 57 FR 13498 at 13506, April 16, 1992.

EPA acknowledges that s tates have a difficult choice with regards to requesting a voluntary reclassification for an area for any classification. On the one hand, such a request may be viewed as a failure of the s tat e to ensure that the s tate has undertaken sufficient measures to ensure the ambient air meets federal standards in a timely manner. On the other hand, for the case of a marginal area, waiting until the attainment date to pass may leave the s tate insuffici ent time to ensure sufficient measures are implemented in time to attain by the new attainment date if the area must be reclassified for failure to attain. EPA would expect s tates to consider the results of the CSPAR (currently stayed by the court) modeli ng for 2014 when deciding to request a voluntary reclassification for a marginal area

. A marginal designation need not guarantee a marginal area will attain an ozone NAAQS by the applicable attainment date. In fact, the CAA contemplates that some will not and prescribes the remedial action of a reclassification under section 181(b)(2) to moderate or higher depending upon the area’s design value. Nor does EPA expect all marginal areas will attain by the applicable marginal area attainment date

– three y ears after designation. In the February 14, 2012 (77 FR 8197), notice of proposed rulemaking regarding classifications approach and attainment deadlines for the 2008 ozone NAAQS, EPA stated: “Marginal areas are expected to attain the 2008 NAAQS within 3 y ears of designation (e.g., in 2015) due to reductions of ozone precursors resulting from a number of federal and state emission reduction programs that have already been adopted. ... EPA estimates that in about half of the Marginal areas, these reductions in conjunction with other ongoing state and federal controls should be sufficient to bring about attainment. In other areas, additional control measures may be needed for timely attainment.” See

, 77 FR at 8202, February 14, 2012 and Docket EPA

– HQ

– OAR

– 2010

– 0885.

18 This is the applicable attainment date for marginal 1

- hour ozone nonattainment areas classified on
November 15, 19 90.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 28 of 103 If a s tate believes one of its marginal nonattainment areas will not attain with reductions from measures already promulgated, that s tate has the choice of at least two options

--- wait until the area fails to attain and accept the reclassification to a higher classification or request a voluntary reclassification prior to the attainment date.

Maryland Comment: Maryland stated that under then EPA’s current designation proposal, 19 the current Baltimore Nonattainment Area would be the lone moderate

n onattainment area on the East coast. Maryland claims that the results of EPA’s modeling performed for the CSAPR indicates that 10 or more ppb of an average ozone concentration in Maryland comes from states contiguous to Maryland. Surely a state that
is contiguous must satisfy a plain reading of the word nearby. The 10 ppb are not simply attributable to power plant emissions but to emissions from other sectors especially the mobile sector. A large nonattainment area including the contiguous States woul d require other States to adopt controls for other sectors and thus, decrease imported pollution from
other sectors.

EPA Response : EPA disagrees with the comment er

. EPA’s past practice has generally
define d the s tates’ portions of constituent parts of non attainment areas in terms of whole or partial counties, cities, townships, and other subdivisions of states. At times, a n entire

s tate may be designated nonattainment due to its small size, the distribution of violating
monitors across that s tate, the dis tribution of emissions

, and the s tate’s recommendation. However, this does not always result in an entire s tate being in only one nonattainment area. For instance, all of Connecticut was designated nonattainment under the 1

- hour and
the 1997 8

- hour NAAQS . See 40 CFR 81.307. However, given the sheer physical size of Pennsylvania, Virginia and West Virginia, EPA believes that designating the entirety
of these s tates as nonattainment given the scale of such a nonattainment area and such designation is to remedy an interstate transport problem.

Maryland Comment: M aryland stated that under EPA’s current designation proposal, the
current Baltimore Nonattainment Area would be the lone moderate nonattainment area on the East coast. Maryland claimed that a l arge nonattainment area such as a 17 State area will help Maryland in several ways.

EPA Response: EPA disagrees with the comment insofar as to designating a 17 State
nonattainment area

, although EPA does not disagree that transported ozone and

precursors thereto from other s tates affects ozone concentrations in Maryland. However, EPA notes that section 110(a)(2)(D) only prohibits emissions that “contribute significantly” to nonattainment in another State not any level of contribution to
nonattainment in another State, and, EPA believes that under section 107(d)(1)(A) the terms “contribute” to violations in a “nearby” violating a NAAQS does not mean any
level of “contribution” but rather a degree of contribution sufficient to deem or warrant designation a s nonattainment as stated elsewhere in this document. As discussed above,

19 Though no citation was provided, Maryland’s statement is consistent with proposed “Table 1” in the February 14, 2012 (77 FR 8197 at 8201) proposed rule.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 29 of 103 EPA believes that designations of nonattainment are not to be used to address interstate transport. EPA does not disagree that Maryland would benefit through the designation of
a 1 7 s tate ozone nonattainment area. However, those benefits come at the price to 16 other entire States which price is designation as nonattainment. 20

Maryland Comment: Maryland claimed that it alone would be required to implement more controls at genera lly more than 4 to 8 times the cost of controls EPA plans to impose on states under the CSAPR.

EPA Response: EPA acknowledges that nonattainment areas have to implement at times costly controls. To the extent that Maryland is commenting on the disparit y of the cost of
local controls and what should be required to reduce emissions to meet section 110(a)(2)(D)’s prohibition of emissions that “contribute significantly” to nonattainment in other States, EPA believes this is not the forum for such a comment but that rulemakings regarding section 110(a)(2)(D) might be. For the CSAPR (currently stayed by the court) , the comment period has closed

Maryland Comment: With regard to the use of the Five Factor Analysis Maryland
asserted:

EPA has not been able to promulgate a regulation to control long range transport so that controls are in place to provide improved air quality prior to attainment deadlines. EPA has the discretion to modify the evaluation criteria for designating area boundaries to
account for lo ng range transport. The designation process should include such a factor in designating nonattainment areas now and in the future as it is the responsibility of a state to control significant pollution contribution to other areas.

The EPA analysis for ozon e nonattainment area boundaries and CSAPR both have the goal of identifying “linkages” and “significant contributions” to an area’s ozone problem. For consistency, the EPA should use the same standard as laid out in CSAPR federal regulations, which have g one through the public comment process, should have priority over the interpretation of ozone nonattainment area boundary criteria, which only appear in EPA memoranda to the states. In addition, the CSAPR approach to identifying meteorology

- based linkages is consistent with the science of ozone formation and more importantly transport.

EPA Response: EPA disagrees with the comment er

. With respect to adapting the factors considered during the designation process to the nature of the pollutant, EPA believes that section 107(d) provides the Agency with discretion to determine how best to interpret the terms in the definition of a nonattainment area (e.g., “contributes to” and

20 The District of Columbia was one of the 17 Maryland identified for the 17 State area but w ill designated
nonattainment because among other things due to violating monitors within its boundaries.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 30 of 103 “nearby”) for a new or revised NAAQS, given considerations such as the nature of a

sp ecific pollutant, the types of sources that may contribute to violations, the form of the standards for the pollutant, and other relevant information. In particular, EPA believes that the statute does not require the Agency to establish bright line tests or thresholds for what constitutes contribution or nearby for purposes of designations. 21 Similarly, EPA believes that the statute permits EPA to evaluate the appropriate application of the term ‘‘area’’ to include geographic areas based upon full or par tial county boundaries, and contiguous or noncontiguous areas, as may be appropriate for a particular NAAQS. EPA has expressed this position in prior designation actions. For example, see , 74 FR 58688 at 58691, November 13, 2009.

Regarding use of an ap proach for identifying meteorology

- based linkages that has gone through notice and comment rulemaking, EPA disagrees. Firstly, section 107(d)(2) of the CAA exempts designations under section 107(d)(1) from notice and comment rulemaking but encourages such process and rulemaking for section 107(d)(1) designations; section 107(d)(1) designations are not one of the types of rule actions listed in section 307(d) of the CAA (setting forth an equivalent process for certain specified types of action). Secondly, EPA did open a comment period for this round of section 107(d)(1) designations “to solicit public comments from interested parties other than states and tribes on the EPA’s recent responses to the state and tribal designation recommendations
for the 2008 O zone NAAQS.” See , 76 FR 78874, December 20, 2011.

Regarding using the CSAPR (currently stayed by the court) approach to identifying meteorology

- based linkages is consistent with the science of ozone formation and more importantly transport, EPA does no t dispute that modeling might be used to identify
contributor

- receptor linkages. But the CSPAR (currently stayed by the court) modeling simply aggregated emissions and subsequent impacts on too coarse a basis

– state

- wide

-- for use in the current section 107(d)(1) designations process. The linkages found under
CSAPR (currently stayed by the court) are adequate for determining linkages between upwind States and downwind receptor monitors for the purpose of identifying significant
contribution under section 1001(a0(2)(D). However discussed above, EPA believes that designations of nonattainment are not to be used to address interstate transport.

3.2.3. 2

. Philadelphia

- Wilmington

- Atlantic City, PA

- NJ

- MD

- DE

Comment: One commenter asks the EPA to add Luzerne and Schuylkill Counties, in Pennsylvania, to the Philadelphia

- Wilmington

- Atlantic City , PA

- NJ

- MD

- DE nonattainment area (Philadelphia area). EPA’s analysis omitted any discussion of Luzerne or Schuylkill Counties, even though these counties have very high emissions of ozone precursors in the region, and the wind patterns into the Philadelphia area indicate that pollution from these counties blows into the currently proposed nonattainment counties for much of each year. The commenter alleges that modeling, monitoring, and

21 This view has been confirmed in Catawba County v. EPA , 571 F.3d 20 (D.C. Cir. 2009)R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 31 of 103 meteorological data all demonstrate that this pollution impacts the Philadelphia area, and support the inclusion of these counties in the ozone nonattainment area.

EPA Response: Luzerne and Schuylkill Counties are not in the same CSA as the Philadelphia area, nor are these counties adjacent to the nonattainment area. Therefore, EPA did not include these counties in EPA’s analysis for the Philadelphia , PA area. EPA did include an analysis of these counties’ potential contributions to non attainment in its analysis for the Allentown

- Bethlehem

- Easton , PA nonattainment area (Allentown area)

. T he five

- factor analysis for the Allentown nonattainment area indicated that the inclusion
of the counties in the Allentown area is not warranted. Schu ylkill County was also
included in the five

- factor analysis for the Reading area. Again, EPA’s five

- factor

a nalysis showed that Schuylkill County should not be included in the Reading
nonattainment

. The TSDs for these areas provide more detail.

Comment: Luzerne and Schuylkill Counties rank higher in NOx and VOC emissions than some of the counties within the MSA that have been designated nonattainment, or which EPA intends to designate nonattainment.

EPA Response: Luzerne and Schuylkill Counties rank lo wer in NOx and VOC emissions than all the counties in Pennsylvania that EPA has included in the Philadelphia
nonattainment area : Bucks, Chester, Delaware, Montgomery, and Philadelphia Counties. Luzerne and Schuylkill Counties also rank lower in NOx and VO C than Berks County, which EPA has included in the Reading nonattainment area. Even assuming that emissions are higher than one or more counties included as part of the nonattainment area, we note that emissions is only one of the factors considered in det ermining whether to include an area within the boundaries of a particular nonattainment area. EPA’s full
five

- factor analysis for each nonattainment area is provided in the TSD for that area.

Comment: Commenter alleges that the Hunlock power plant in Lu zerne County is a
coal

- fired power plant located approximately 20 miles northwest of the area proposed to be designated nonattainment. The commenter alleges that Hunlock does not have any equipment installed to control its NOx emissions and is emitting N Ox in close proximity to a proposed nonattainment area around a highly populated city. The commenter further alleges that wind patterns around Hunlock in Luzerne County support the inclusion of that county in the nonattainment designation of the Philadelph ia area. A wind rose showing the average wind direction over a five year period near Hunlock indicates that the wind is blowing in a direction that causes Hunlock’s emissions to travel into the proposed nonattainment counties, particularly Carbon County, o n about 40% of the windy days. The commenter further alleges that because Hunlock is an uncontrolled source of NOx in a county contiguous to proposed nonattainment counties, the “emissions data” factor weighs heavily towards including Luzerne County in th e Philadelphia area.

EPA Response: The EPA notes that the commenter asked EPA to include Luzerne County in the Philadelphia nonattainment area although Luzerne C ounty is locatedR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 32 of 103 adjacent and northwest of Carbon County, which is included in the Allentown area. As noted previously, EPA did not consider including Luzerne County as part of the Philadelphia nonattainment area because it is not part of the Philadelphia CSA and it is not adjacent to any counties that are part of that CSA. Thus, EPA does not co nsider it “nearby” for purposes of designation. Neither is Luzerne County part of the Allentown

Bethlehem

- Easton, PA

- NJ MSA. We provide the following details for informational purposes only.

EPA identified two Hunlock power plants in Luzerne County, Hunl ock Creek Energy
Center (facility ID 3176 ) and Hunlock Unit 4 (facility ID 56397 ). The table below summarizes publicly available emissions data from EPA’s Clean Air Markets Division (CA MD ) Data and Maps website, http://ampd.epa.gov/ampd/QueryToolie.html f or the
two Hunlock facilities.

Facility

Name Facility ID (ORISPL) Unit ID Year Operating

Time # of
Months Reported NO x Tons County Facility
Latitude Facility Longitude Operating

Status Fuel Type(s) (Primary) Fuel Type(s) (Secondary) NOx Control(s)

Hunlock
Creek Energy

Center 3176 6 2008 7,996 12 681.7 Luzerne 41.2033

- 76.0683 Operating Coal Residual Oil

Hunlock

Creek Energy

Center 3176 CT5 2011 226 3 17.0 Luzerne 41.2033

- 76.0683 Operating (Started 05/31/2011) Pipeline
Natural Gas Diesel Oil Water Injection
Selective Catalyt ic
Reduction

Hunlock

Unit 4 56397 4 2008 407 12 6.9 Luzerne 41.2033

- 76.0683 Operating Pipeline
Natural Gas -- Water Injection

Hunlock

Unit 4 56397 4 2011 172 12 2.9 Luzerne 41.2033

- 76.0683 Operating Pipeline
Natural Gas -- Water Injection

Caveat: Hu nlock (ORISPL 56397) Unit 4 in Pennsylvania was previously Hunlock Creek Energy Center (ORISPL 3176) Unit 4 in Pennsylvania, and started submitting emissions at the new location in the first quarter of 2006.

As can be seen from the emissions data provide d above, in 2008 Hunlock Creek Energy Center was a gas

- fired power plant with 681.7 tons of NOx emissions and no NOx controls. However, this facility converted to natural gas in 2011 and installed NOx control, water injection and selective catalytic reduc tion. These changes to the facility will result in lower NOx emissions. However, only three months of preliminary emissions data has been reported for 2011. Hunlock Unit 4 is a gas

- fired facility which had 6.9 tons of NOx emissions in 2008 and only 2.9 tons in 2011. Furthermore, the wind rose that the commenter provided (commenter Exhibit 4) shows that prevailing winds
from area in which the Hunlock facilities are located are from the southwest. This indicates potential impacts towards Lackawanna and W yoming Counties, and not theR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 33 of 103 Philadelphia or Allentown areas. The wind rose does show winds from the northwest towards Carbon County, but much less frequently than the prevailing southwesterly wind. Carbon County is to the south and east of Hunlock. The refore, winds that pass over Hunlock from the northwest would impact Carbon County. EPA does not have the raw data used to develop the commenter’s wind rose. However, it appears that, upon visual analysis of the wind rose, that winds from Hunlock carry a ir towards Carbon County on about 20% of windy days. Thus, considering the low emissions and infrequent winds towards Carbon County, the potential contribution of Hunlock to Carbon County does not
warrant inclusion of Luzerne County in the Allentown area.

Comment: Commenter alleges that the WPS Westwood power plant (Westwood) in Schuylkill County, approximately 15 miles northwest of the currently

- proposed nonattainment area, has no NOx controls. The commenter further alleges that wind patterns around the Westwood plant indicate that pollution from that plant is significantly impacting the ability of Lehigh and Berks counties to come into attainment or maintain the NAAQS once attained, because the wind patterns for Westwood indicate that wind on
35% of windy days will blow the plant’s pollution toward Berks or Lehigh counties. The wind pattern data show that winds are likely contributing to pollution levels in Lehigh and Berks Counties, and indicate that it would be improper to exclude Schuylkill County from the nonattainment designation for the Philadelphia area. The commenter further alleges that because Westwood is an uncontrolled source of NOx in a county contiguous to proposed nonattainment counties, the “emissions data” factor weighs heavily towards including Schuylkill County in the Philadelphia area.

EPA Response: The EPA notes that the commenter asked EPA to include Schuylkill County in the Philadelphia nonattainment area although Schuylkill County is located adjacent and northwest of Lehigh Co unty (in the Allentown area) and Berks County ( only

c ounty comprising the Reading, PA nonattainment area). As noted previously, EPA did not consider including Schuylkill County as part of the Philadelphia nonattainment area because it is not part of the P hiladelphia CSA and it is not adjacent to any counties that are part of that CSA. Thus, EPA does not consider it “nearby” for purposes of designation. Neither is Schuylkill County part of the Allentown

- Bethlehem

- Easton, PA

NJ MSA or the Reading, PA MSA

. We provide the following details for informational purposes only.

The commenter is correct that Westwood is a coal

- fired plant with no NOx controls. The table below summarizes publicly available emissions data from CA MD ’s Data and Maps website, http://am pd.epa.gov/ampd/QueryToolie.html for Westwood. The facility reported emissions of 254.5 tons in 2008 and 219.6 tons in 2011.

Facility

Name Facility ID (ORISPL) Unit

ID Year Operating

Time # of
Months Reported NO x Tons County Facility
Latitude Facility Longitude Operating

Status Fuel Type(s) (Primary) Fuel Type(s) (Secondary) NO x Control(s)

WPS
Westwood Generation, 50611 031 2008 7,314 12 254.5 Schuylkill 40.6191

- 76.4500 Operating CoalR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 34 of 103 Facility

Name Facility ID (ORISPL) Unit

ID Year Operating

Time # of
Months Reported NO x Tons County Facility
Latitude Facility Longitude Operating

Status Fuel Type(s) (Primary) Fuel Type(s) (Secondary) NO x Control(s)

LLC

WPS
Westwood

Generati on,
LLC 50611 031 2011 7,148 12 219.6 Schuylkill 40.6191

- 76.4500 Operating Coal Diesel Oil

The wind rose that the commenter provided (commenter Exhibit 5) shows prevailing winds from the northwest, with some winds from the south. Therefore, emissions f rom Westwood may have some potential impact on Lehigh and Berks Counties. However, EPA considered these impacts in the five

- factor analyses for the Allentown and Reading areas and determined that the potential impacts did not warrant inclusion of Schuylki ll County in either the Allentown or Reading nonattainment areas. The Allentown and Reading nonattainment areas are located between Schuylkill County and the Philadelphia area. Therefore, any impacts on the Philadelphia area from Westwood or otherwise fr om Schuylkill County would be even less than the impacts on the Allentown and Reading

areas.

Comment: Population density and degree of urbanization should be considered when undertaking area

- specific analyses to support nonattainment boundary recommend ations. Luzerne and Schuylkill counties are contiguous to a densely

- populated nonattainment
area. This adds to the case that Luzerne and Schuylkill Counties must be included in the nonattainment designation, since they are impacting a large population by c ontributing to the Philadelphia area’s ozone pollution.

EPA Response: As provided previously, Luzerne and Schuylkill Counties are adjacent to the Allentown and Reading nonattainment areas and ou r analysis of both of these counties for Allentown and Schuyl kill for Reading are provided in the TSDs for those areas. We did not consider these counties as part of our analysis for the Philadelphia area because we do not consider them “nearby.”

Comment: EPA need not limit itself to the “presumptive” boundaries for a nonattainment area in determining which counties to include. EPA has repeatedly stated that counties outside the presumptive boundary that do not themselves contain violating monitors can still be designated nonattainment areas if they contain emis sions sources with the potential to contribute to NAAQS violations in the existing nonattainment area. The commenter listed examples of areas where EPA has included counties outside the presumptive area boundaries in a nonattainment area. EPA’s discretio n to expand an area beyond the presumptive political, MSA, or CSA boundary has been upheld in the courts. The commenter also cited case law upholding this practice. The commenter concludes that, “with the strong evidence pointing to Luzerne and Schuylkill counties as culprits in the Philadelphia area’s ozone problem, it would be arbitrary for EPA not to include them,R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 35 of 103 or at a minimum, not to fully analyze the relevant arguments for doing so and the
available data.”

EPA Response: EPA agrees that the Agency is not limited to the presumptive area boundary for nonattainment area designations. However, we generally do not consider counties that are not adjacent to the MSA or CSA as we do not consider such areas as “nearby.” As provided previously, Luzerne and S chuylkill Counties are adjacent to the Allentown and Reading nonattainment areas and our analysis of both of these counties for Allentown and Schuylkill for Reading are provided in the TSDs for those areas.

3.2.3. 3

. Pittsburgh

- Beaver Valley, PA

Comment: One commenter asks EPA to include Preston, Marion, Monongalia, and Marshall Counties in West Virginia as part of the Pittsburgh

- Beaver Valley ozone nonattainment area. The commenter argues that these counties contribute to ozone

causing pollution in the nearby Pittsburgh area . The commenter further argues that these counties have some of the highest emissions of ozone precursors in the region, and the wind patterns into the Pittsburgh area indicate that pollution from these counties bordering the Pittsbu rgh area blows into the proposed nonattainment counties for much of each year. In particular, the commenter argues that Marshall County ranks much higher than many of the counties within the MSA that EPA has recommended for designation as
nonattainment. Further, the commenter argues that modeling, monitoring, and meteorological data for all of these counties demonstrate that their pollution impacts the Pittsburgh area.

EPA Response: Preston, Marion, Monongalia, and Marshall Counties in West Virginia

are n ot part of the census

- defined 2009 Pittsburgh

- New Castle Consolidated Statistical Area that EPA used as its presumptive analytical starting point for evaluating the geographic boundaries for nonattainment for the violating monitor in Allegheny County,
Penn sylvania. EPA followed the methods described in its December 4, 2008 memo entitled “Area Designations for the 2008 Revised National Ambient Air Quality Standards” in selecting the Pittsburgh

- New Castle CSA as its presumptive starting point for its designa tions analysis. Of the counties listed by the commenter, only Marshall was designated nonattainment in the pa st under the 1997 ozone NAAQS (a s part of the Wheeling, WV

- OH nonattainment area )

.

As shown in Figure 1of EPA’s technical analysis in the Pittsbur gh

- Beaver Valley (Pittsburgh) TSD, several ozone monitor ing stations lie in and between the identified counties and the violating monitor in Allegheny County. These include monitors attaining the 2008 ozone NAAQS in Ohio and Monongalia Counties in West Vi rginia, and Greene, Washington, Westmoreland, Beaver, and Allegheny Counties in Pennsylvania. Of the four West Virginia counties in question, only Monongalia has an ozone monitor, and that monitor shows attainment of the 2008 NAAQS based on the

most recen t three

- year period.

While the NOx emissions from Marshall County (26,812 tons per year) are high in comparison to some of the counties EPA analyzed for the Pittsburgh area, they are no t theR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 36 of 103 highest emissions in the area . Both Allegheny and Beaver Counti es both have lar ger NOx emissions (52,399 and 35,714 tons per year, respectively). Monongalia and Preston have relatively lower NOx emissions (13,365 and 3,384 tons per year, respectively). Monongalia County’s emissions are similar to those of Washington and Westmoreland
Counties in the Pittsburgh

- Beaver Valley nonattainment area

. Preston County ’s
emissions are the lowest of all count ies in the Pittsburgh

- Beaver Valley nonattainment area. VOC emissions for Monongalia (4,157 tons per year), Marshall (1,16 8 tons per year), and Preston (3,384 tons per year) are lower than almost every county in the Pittsburgh

- Beaver Valley nonattainment area.

The four West Virginia counties i dentified by the commenter do not contribute appreciable emissions from non

- EGU sou rces, have relatively low population density, and very low overall VMT. All but Monongalia have low or negative growth in population . W hile Monongalia County experienced double digit population growth, it continues to have low overall population. None o f these counties has appreciable commuter contribution to the Pittsburgh area. After considering this information , we found no compelling reason to include in our analysis of Pittsburgh these West Virginia counties that are outside of the Pittsburgh CSA.

The commenter focuses on these four WV counties because of the significant emissions
from coal

- fired electric generating units (i.e., the Kammer plant in Marshall County, Albright power station in Preston County, Grant Town and Rivesville power stations in Marion County, and Fort Martin and Morgantown Energy facilities in Monongalia County) and their potential downwind contribution to the violating monitor in Allegheny County. While not pertinent for determining current contribution from these areas, we

no te that several of these EGUs are now scheduled to shut down. Additionally several have recently installed emissions controls. American Electric Power has announced that
the Kammer facility will shut down by Dec. 31, 2014. First Energy/Monongahela Power Company announced that its Albright Power Station (Preston County) a nd Rivesville
Power Station (Marion County) will shut down by September 1, 2012. First Energy/Monongahela Power Company’s Fort Martin Power Station in Monongalia County has SNCR controls on both units as of 2004 and installed SO 2 scrubbers in 2009. The commenter notes that the Grant Town power station already has SCR in place.

Comment: One commenter asks EPA to include Indiana and Lawrence Counties in Pennsylvania as part of the Pi ttsburgh

- Beaver Valley nonattainment area. The commenter argues that these counties contribute significantly more ozone

- causing pollution in the nearby Pittsburgh area than some of the counties that EPA did recommend for inclusion in the Pittsburgh area. The commenter further alleges that modeling, monitoring, and meteorological data all demonstrate that this pollution impacts the Pittsburgh area, and therefore support inclusion of these counties into the Pittsburgh
nonattainment area. Another commenter recommended that EPA include Lawrence County in the Pittsburgh nonattainment area on the basis that it is part of the Pittsburgh
CSA.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 37 of 103 EPA Response: Under the 1997 ozone standard, Indiana County was a separate nonattainment area from Pittsburgh, as it was d etermined then not to be linked to Pittsburgh on the basis of a jurisdiction factor. Indiana County is not part of the census

defined 2009 Pittsburgh

- New Castle CSA that EPA used as its presumptive analytical starting point for evaluating the geographic n onattainment boundaries for the violating monitor in Allegheny County, Pennsylvania. EPA followed the methods described in its December 4, 2008 memo entitled “Area Designations for the 2008 Revised National Ambient Air Quality Standards” in selecting the Pittsburgh

- New Castle CSA as its presumptive starting point for its designations analysis.

Indiana County was formerly nonattainment under the 1997 ozone NAAQS as part of the Clearfield and Indiana, PA area , but is not violating either the 1997 or 2008 o zone NAAQS based upon the most recent three years of monitoring data. NOx emissions from Indiana County (at 40,012 tons per year) are higher than all the counties in the Pittsburgh CSA, except for Allegheny County; most of the NOx emissions are associated with three major coal

- fired electric generating facilities in Indiana County. However, Indiana County is not only outside the Pittsburgh

- New Castle CSA, but it is one county removed from the violating monitor. Prevailing winds in Indiana County blow mai nly from the east to west, and since Indiana County is located west of the violating monitor

, emissions from Indiana County are not likely to be contributing to the violation in Allegheny County. This is demonstrated by both the wind roses presented in E xhibit 5 of the commenter’s letter (for the largest of Indiana County’s EGUs, Homer City) and by the HYSPLIT modeling presented in EPA’s factor analysis for the Pittsburgh portion of the Pennsylvania TSD. The sulfur dioxide dispersion modeling presented i n Exhibit 6 of the commenter’s letter (for the Homer City Power Station in Indiana County) does not clearly make a case that SO 2 emissions from Homer City cause an impact as far away as the Allegheny County monitor, and it is not clear that this SO2 analys is would demonstrate an impact on ozone in any case since SO2 is not an ozone precursor. Therefore, although EPA did not include Indiana County in its geographic analysis of the Pittsburgh nonattainment area boundaries, for the reasons provided here, we d o not believe that emissions from Indiana County contribute to the violation at the Allegheny
monitor.

Lawrence County comprises the New Castle MSA, which is part of the Pittsburgh

- New Castle Consolidated Statistical Area that was the analytical starting p oint for EPA’s geographic analysis for evaluating the 2008 ozone designations for the violating monitor in Allegheny County. EPA’s analysis of Lawrence County and our rationale for
exclu ding this county from the Pittsburgh nonattainment area is presented in the TSD for
this action.

Lawrence County has a monitor that is not violating the 2008 ozone NAAQS based on the most recent three years of data. (Both the 2010 and 2011 design values are 66 ppb). Emissions from Lawrence County are 8,960 tons per year o f NOx and 3,814 tons per year of VOC, which are similar to those of Washington and Westmoreland Counties in the Pittsburgh nonattainment area, but much lower than the more urban counties of Allegheny and Beaver Counties. A large portion of the NOx emissio ns in this county come from the coal fired 354 megawatt coal

- fired New Castle Power Plant. GenOn Energy, the owner of this plant, has announced that it will shut down this facility by AprilR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 38 of 103 2015, which will result in greatly lower emissions totals for thi s county. Lawrence County has only moderate population and population density, relatively low vehicle miles of travel and very low commuter contribution to the county with the violating monitor (i.e., Allegheny County). As with most counties in the area of analysis, both VMT and population are in decline (minus 1% and 4%, respectively). EPA’s HYSPLIT analysis for the area shows that the wind passes over this county on its way to the violating monitor relatively infrequently, and the commenter’s Exhibit 7 to its comment letter shows that winds blow predominantly from the southwest to northeast direction, which would carry pollution away from the violating monitor in Allegheny County. Further, Lawrence County is defined by OMB as part of its own micropolit an statistical area, which is part of the larger Pittsburgh CSA. Pennsylvania points out in its response to
EPA’s 120

- day letter for 2008 ozone designations that this denotes a lower level of social and economic ties to the Pittsburgh area than the counti es that are part of the CSA. In the past, Lawrence County has not been included in the geographic boundaries for the Pittsburgh ozone nonattainment area under the prior ozone NAAQS. Finally, Lawrence County is part of a separate air basin from the remain der of the Pittsburgh area (i.e., the Upper Beaver Valley Air Basin), as defined by Pennsylvania in 25 Pa Code §121.1.

Therefore, on the basis of the factor analysis set forth in our TSD, EPA did not designate Lawrence County as part of the Pittsburgh

- Be aver Valley nonattainment area.

3.2.4. EPA Region IV

3.2.4.1. Atlanta, GA

Georgia Comment : The Clean Air Act gives EPA the authority to set the National Ambient Air Quality Standard s and to make nonattainment designations, and the Act gives states the re sponsibility to make recommendations on which areas are designated nonattainment and to develop and implement the State Implementation Plan that brings areas into compliance with the NAAQS. In addition, the states know their local emission
sources, meteoro logy and air quality situation better than EPA does. Therefore, EPA should grant deference to the states’ boundary recommendations as long as those
recommendations are consistent with the Act because states are better situated to know
what it takes to brin g an area into compliance with a NAAQS than EPA.

EPA Response: EPA agrees with the c ommenter in that it is the states’ responsibility to submit to the Administrator a list of all areas in the State, designating as nonattainment,
attainment or unclassifiab le. EPA also agrees with the c ommenter in that it is the states’ responsibility to develop and implement the State Implementation Plan that brings areas into compliance with the NAAQS. While EPA does grant some deference to s tate boundary recommendations, EPA is required to independently assess the recommendations and to notify the States where it disagrees with such recommendations. Under section 107(d), EPA ultimately has the authority and responsibility to promulgate the final designations. After receivi ng the list of areas from the state, EPA must exercise independent judgment before promulgating the designations, and the statute provides time to do so. Section 107(d)(B)(i) provides that EPA is to promulgate designationsR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 39 of 103 within one year after receiving t he state’s recommendations. Significantly, the statute also explicitly authorizes EPA to modify state recommendations and to notify the States
120

- days before it promulgates designations of any intended modifications . Section 107(d)(1)(B)(ii) provides that EPA “may make such modifications as the Administrator deems necessary,” to both the recommended designations and the boundaries of the recommended areas. EPA would not have this authority were it merely required to defer
to State recommendations in all in stances. Thereafter, the statute contemplates a period of 120 days within which states have the “opportunity to demonstrate why any proposed modification is inappropriate.” Were EPA required merely to defer to state recommendations in all instances, the Ac t would not be phrased to provide an “opportunity” for states to alter EPA’s judgment about proposed modifications nor would it provide a one year period that includes time for EPA analysis of State recommendations as well as the interactive process during the 120

- day period . Taken together, these provisions demonstrate that EPA is ultimately responsible to promulgate the designations that it believes are most consistent with the requirements of section 107(d), even if such designations deviate from the pre ferences of the state affected by the designation. At a minimum, EPA believes that modifications are “necessary” for nonattainment areas when they do not encompass both the areas that are violating, and
the nearby areas that are contributing to those viola tions, based upon the facts and
circumstances of each area.

Georgia Comment : The Clean Air Act limits EPA’s authority to revise a state’s recommended designation (including boundaries) to situations where it is “necessary” to
do so.

EPA Response: We ag ree that the statute provides for EPA to modify state recommendations “as necessary.” EPA recommends that States use the five

- factor analysis to determine the boundaries of appropriate nonattainment areas as EPA performs such an analysis to determine whet her it is necessary to include areas within the designated area. We note that the term necessary is not expressly defined by the statute, but it must be read in light of the definition of a nonattainment areas which is “any area that does not meet (or that contributes to ambient air quality in a nearby area that does not meet)” the NAAQS. The five

- factor analysis is for the purpose of determining which areas are necessary to include as part of a designated nonattainment area.

Georgia Comment: We do not believe that the inclusion of the additional counties that EPA intends to include in the nonattainment area are necessary or appropriate because it imposes significantly more regulatory burden and higher compliance costs without having a material impact on the nonattaining area’s ability to comply with the standard in a timely manner.

EPA Response: We do not believe that regulatory burden or compliance costs are pertinent considerations in determining whether an area is violating the NAAQS or contributing to a nearby violation of the NAAQS.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 40 of 103 Georgia Comment: EPA stated that they will be “mindful of the President’s and Administrator’s direction that in these challenging economic times EPA should reduce uncertainty and minimize the regulatory burdens on st ate and local governments”.

EPA Response : The EPA refers the commenter to section 3.1. 5 of this document for a response regarding “economic harm” associated with the ozone designations process

.

Georgia Comment: Georgia comments that it is reasonable to i nterpret “contributes to” in Clean Air Act section 107(d)(1)(A)(i) to mean that EPA can include an area/county as part of a nonattainment area if inclusion would affect the ability of the area to attain the
standard.

EPA Response: Nearby counties shoul d be included as part of the NAA if the five

factor analysis supports that they contribute . Inclusion of any single county materially
affect s the ability of entire a rea to comply

.

Georgia Comment: Including counties where the state has little or no abil ity to obtain further emission reductions may make it very difficult to meet the Clean Air Act Reasonable Further Progress (RFP) requirement.

EPA Response: As noted previously, we do not consider the adoption of future controls in our analysis of whether an area is currently contributing to a violation of the NAAQS in a nearby area. It is unclear what specific county or area the state may be referring to in this comment. In most cases, we anticipate that an area where there are no or few
reductions to be obtained would have very low emissions. The current emissions in the area are a factor that we consider in our analysis, though it is not the sole factor in our
five

- factor analysis. Unless other factors strongly support inclusion of a county, a county

t hat has few emissions generally would not be included as the nonattainment area in the absence of a violation of the standard in that county. To the extent a county with very low emissions is included as part of a nonattainment area, we note that those em issions would only be a small par t of the RFP baseline, which is based on emiss ions from throughout the area. Finally, we note that the only nonattainment area in Georgia

– the
Atlanta area

– is classified as marginal and we do not interpret the RFP requir ements in subpart 1 to require reductions beyond those needed for attainment for marginal areas. 22

22 Section 182(a) does not excuse marginal areas from the RFP re quirement in subpart 1. However, because of the short period marginal areas have to attain and because of the assumption that such areas should be able to attain based on controls already in place, we do not interpret the RFP requirement to require more t han the reductions already scheduled to occur.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 41 of 103 Georgia Comment: Georgia followed EPA’s weight

- of

- evidence approach documented in their preliminary TSD for the Atlanta area, but supplemented EPA’s approac h by assessing the distance from a county centroid to the violating monitor as evidence supporting a count y’s inclusion in the nonattainment area

. EPA Response: EPA agrees with the commenter that states can supplement factor analyses with additional info rmation. As presented in the TSD for the Atlanta area, EPA
chose to examine the following 5 factors:

1. Air quality data (including the design value calculated for each Federal Reference Method (FRM) or Federal Equivalent Method (FEM) monitors in the area); S ee 40 CFR part 58
2. Emissions and emissions

- related data (including location of sources and population, amount of emissions and emissions controls, and urban growth patterns);
3. Meteorology (weather/transport patterns);
4. Geography and topography (mountain range s or other basin boundaries);
5. Jurisdictional boundaries (e.g., counties, air districts, existing nonattainment areas, Indian country, metropolitan planning organizations (MPOs))

.

All data and information used by EPA in this evaluation are the latest avail able to EPA and/or provided to EPA by states or tribes. Congress required a similar approach in 1990
for areas classified as serious or above for the 1

- hour ozone standard and EPA used the same basic approach in the designation process for the 1997 ozone N AAQS. EPA generally agrees that the CSA or CBSA areas are a rational starting place for evaluating what areas violate and contribute to violations of the ozone NAAQS, but they are not
outcome determinative.

Georgia Comment: Georgia included data regard ing reduced NO X emissions from two
coal

- fired power plants as evidence that current (i.e., 2011) NOx emissions in Bartow and Coweta are less than what EPA presented in the preliminary TSD. Georgia provided the data to support excluding these counties.

EPA Response: EPA appreciates actions by these sources to reduce emissions. However, even after considering the noted emission reductions, we hav e concluded that Bartow and
Coweta Counties contribute to violations in nearby areas

. Therefore, EPA must include
the se counties within the boundaries of the Atlanta nonattainment area. During the process of developing the nonattainment area SIP, the state and EPA will closely examine

sources within Bartow and Coweta Counties to determine the necessary level of contro l to assure that these areas attain the ozone NAAQS as expeditiously as practicable. It may, in the end, be determined through the appropriate process that sources within these
counties are appropriately controlled for NO X emissions, so that no additional controls are required by section 172 or other applicable statutory or regulatory requirements.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 42 of 103 Comment: County Commissioners disagree that Barrow County , Newton County, Spalding County and Paulding County should be included in the proposed Atlanta

nonatt ainment area. They defer to the Georgia Environmental Protection Division’s (GA EPD) February 29, 2012, response to EPA’s preliminary designation to provide their
rationale.

EPA Response: EPA’s analys e s provided in the final TSD for the Atlanta area

con sider ed the new information submitted by GA EPD on February 29, 2012

.

3.2.4.2. Charlotte

- Rock Hill, NC

- SC

Catawba Indian Nation Comment: The Catawba Indian Nation commented that

c urrently, no air quality data or violating air quality monitor exists for areas within the geographic boundaries of the Catawba Indian Nation 23 Reservation. The y further note
that there are no point sources of air quality emissions within or directly adjacent to the
boundaries of the Catawba Indian Nation , and, therefore, areas o f Indian country should be designated as unclassifiable/ attainment

. EPA Response: EPA agrees with the documentation and conclusions provided by the
Catawba Indian Nation in their factor analyses . EPA’s assessment of the Catawba Indian
Nation ’s analyses is described in more detail in the TSD for the Charlotte

- Rock H ill, NC

SC area.

Catawba Indian Nation Comment: The Catawba Indian Nation does not feel that the York County monitor is “properly placed to accurately measure the air quality from
within the urbanized portion of York County or the Catawba Indian Nation.”

EPA Response: The South Carolina Department of Health and Environmental Control (SC DHEC) is responsible for determin ing the appropriate monitoring network to monitor air quality within the S tate of South Carolina. SC DHEC determines the State monitoring network in compliance with the minimum ambient air quality monitoring which is listed in the CFR specifically at 40 CFR part 58, Appendix D. Appendix D lists
the factors considered when dete rmining the minimum number of ozone monitors needed
in a n MSA. Those factors are: 1) MSA population and 2) h istorical ozone concentration monitoring results for the MSA. SC DHEC monitoring network plans are subject to a 30

- day public comment period throu gh the SC DHEC website. EPA approves the South Carolina monitoring network plan based upon the criteria listed in 40 CFR part 58, Appendix D. EPA has approved the most recent monitoring network plan for the State of South Carolina, which includes the Cat awba Indian Nation Reservation , as satisfying the minimum ambient air quality monitoring requirements described in 40 CFR part 58, Appendix D. EPA notes that the nonattainment portion of York County was included in

23 Catawba Indian Nation (aka Catawba Tribe of South Carolina)R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 43 of 103 the Charlotte

- Rock Hill, NC

- SC area due to its contribution to violating monitors in
North Carolina

.

North Carolina Comment: North Carolina has carefully examined the Charlotte

- Rock Hill, NC

- SC area and has determined that a number of townships with rural
characteristics with little to no emi ssion sources should be designated attainment. North Carolina presents this information in its response to EPA’s 120

- day letter.

EPA Response: EPA believes North Carolina has provided an adequate rationale for designating partial counties along township b oundary lines and refer ences the TSD for
the Charlotte

- Rock Hill, NC

- SC area for our rationale for final designations for the 2008
8

- hour ozone NAAQS.

South Carolina Comment: The State commented that the urbanized portion of York County, South Carolina sh ould not be included in the Charlotte

- Rock Hill

, NC

- SC
nonattainment area for the 2008 eight

- hour ozone standard because all air quality monitors in South Carolina are attaining the 2008 ozone standard. The State encouraged
EPA to consider additional evid ence presented to EPA by SC DHEC.

EPA Response: EPA considered the data presented by SC DHEC in its analyses provided in the final TSD for the Charlotte

- Rock Hill, NC

- SC area. Based on EPA’s five

factor analysis, EPA included part of York County, South Carolina in the Charlotte

- Rock
Hill nonattainment area.

South Carolina Comment: During the last 10 years, ozone design values at the York County monitor decreased 24 percent. “The 2011 ozone value in York County is well below the standard at 0.064 par ts per million (ppm).”

EPA Response: EPA acknowledges that the ozone monitor in York County is attaining
the 2008 8

- hour ozone NAAQS with 2009

- 2011 data at 0 .064 parts per million (ppm). The presence of an attaining monitor in York County does not establ ish whether emissions activity in York County is contributing to violations in nearby counties. EPA believes our technical evaluation of York County shows contribution to the air quality in
the Charlotte area. Please see our TSD for further details on our analyses.

South Carolina Comment : The Arrowood monitor ( site id 37

- 119

- 1005) in Mecklenberg County, NC “... better represents the southern Charlotte metropolitan area and does not represent York County. The ozone concentration gradient map indicates that

o zone concentrations decrease rapidly from the southern side of Charlotte to York County. ” The gradient map indicates ozone concentrations in York County are less than the 2008 ozone NAAQS . The gradient map adds weight to the argument that YorkR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 44 of 103 County, in its entirety, including the Catawba Indian Nation Reservation should be designated attainment.

EPA Response: EPA agrees that spatial analysis of air quality monitoring data can be a useful tool for evaluating ambient air impacts of pollutants. It is clear from an evaluation of the ambient air monitoring data, the highest ozone design values occur at the monitors located closest to the City of Charlotte. However, as indicated in EPA’s document titled

“ Developing Spatially Interpolated Surfaces and Estimatin g Uncertainty (EPA

- 454/R

04

- 004),” care must be exercised when interpreting the results of any spatial analysis developed using statistical modeling techniques, such as the kriging done by South Carolina to develop the “Ozone Concentration Gradient” map sh own in Figure A

- 5 of their Response to EPA. It is important to consider the uncertainty associated with interpolating (i.e., kriging) data collected at a limited number of air monitoring sites. South Carolina has not provided an uncertainty analysis for th e kriging methodology that was used. Quoting from section 8.3 of EPA

- 454/R

- 04

- 004, “A kriging spatial interpolation surface is expected to provide a reasonable spatial description of the pollution process in general, but to require it to be highly accurate at each specific location may be an unreasonable expectation.” Therefore, the location of specific contours on South Carolina’s map should be considered estimates and not necessarily highly accurate.

When viewing the Ozone Concentration Gradient map prov ided by South Carolina, it is also important to recognize concentrations shown on the map are 2009

- 2011 design values that represent different wind patterns and meteorology that occurred only on specific days over a three year timeframe that go into the de sign value calculations. Therefore, looking solely at the map to evaluate potential contribution from ozone precursor emissions from sources in York County is difficult. The map should be considered in conjunction with an analysis of meteorology as was don e in South Carolina’s response. It is important to realize that the map is different from a contoured map of concentrations generated from an air quality model which uses the spatial distribution of air emissions and simulates atmospheric chemistry and tra nsport to provide spatial estimates ozone concentrations.

South Carolina Com ment: The EPA’s ozone siting guidance states “...the most significant amount of transported ozone and ozone precursors will come from the area where the winds enter the city.” Back trajectories indicate that monitors around Charlotte are impacted by local emissions from the Charlotte metropolitan area. Back trajectory analysis of all monitors in the Charlotte metropolitan area shows that approximately 80 percent of all air masses on days exceeding the ozone standard passed through the Charlotte metropolitan area suggesting that at least a portion of the ozone measured at the sites was formed locally. Back trajectory analyses indicate that all of the Charlotte area monitors are being impacted by local plumes from Charlotte or are indicative of stagnation with recirculation.

EPA Response: South Carolina has provided a thorough back trajectory analysis developed with NOAA’s HYSPLIT model for each of the ozone monitors in theR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 45 of 103 Charlotte m etropolitan area during episodes when the monitors measured exceedances of the ozone standard (see Appendix A of South Carolina’s response). EPA agrees with South Carolina’s assertion that many of the back trajectories show air masses passing
over Charlott e on ozone exceedance days. However, some of the back trajectories pass over York County indicating the potential for York county emissions to contribute to ozone exceedances during these specific events (e.g., June 8, 2011). Recirculation of
emissions f rom other areas and elevated “aged ozone” from stagnation conditions may contribute to the ozone exceedances during these events, but nothing provided by South
Carolina conclusively excludes transport of emissions from York County. Therefore, York County cannot be ruled out as a potential contributor to ozone violations at the
Charlotte monitors. See EPA’s TSD for additional discussion of this issue.

South Carolina Comment: South Carolina claims that it would cause unnecessary
economic burdens for the EPA to designate a portion of York County, including the Catawba Indian Nation “nonattainment” simply because they are a part of a presumptive boundary (CSA/CBSA). The term “Core Based Statistical Area” (CBSA) is a collective term for both metropolitan and micropolitan statistical areas (metro and micro areas). Metro and micro areas are geographic entities defined by the U.S. Office of Management and Budget (OMB) for use by Federal agencies in collecting, tabulating, and publishing
federal statistics. For E PA to default to a presumptive boundary for “consistency” purposes stifles the creativity to improve air quality as expeditiously as possible.”

EPA Response : The EPA refers the commenter to the response in section 3.1. 5 of this
document for a discussion of EPA’s position on presumptive boundaries.

Comment: One commenter supports South Carolina’s boundary recommendation requesting that all of South Carolina be designated attainment. They do not support EPA’s proposal to include part of York County in the Charlotte

- Rock Hill, NC

- SC
nonattainment area for the 2008 ozone standards and believe EPA should defer to the
State’s recommendations. The c ommenter is located within the current 8

- hour ozone nonattainment area established for the 1997 standards (which i s the same as that proposed for the 2008 ozone standards) and states that they have gone through “extensive”
measures to meet the no nattainment NSR requirements, including undergoing Lowest Achievable Emission Rate (LAER) review, obtaining offsets, and ins talling NOx Continuous Emission Monitoring Systems. They have also stated that they have taken voluntary measures which combined with the required me asured reduced emissions. The

c ommenter notes that the offsets increased their capital cost of the projec t by 5 percent
with no financial return.

The c ommenter also notes that the portion of York County that EPA proposed for nonattainment for the 2008 ozone standards has already undergone Reasonable Available Control Technology (RACT) and nonattainment NSR analysis. They note that an Inspection and Maintenance (I&M) program is not feasible or required on mobile sources, and any new industry locating in this area would be subject to the applicableR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 46 of 103 regulations in place such as PSD, Maximum Achievable Control T echnology (MACT), New Source Performance Standards (NSPS), and the control of VOC prescribed in SC Regulation 61

- 62.5, Standards 5 and 5.1, all of which address ozone pr ecursors. The

c ommenter believes that, as a result, there is very little opportunity fo r emissio n reductions in this area. The c ommenter states that a nonattainment designation and the time spent fulfilling its regulatory obligations do not improve air quality, but instead “consumes significant local, state, and federal resources that would have been better utilized for air quality improvements.”

EPA Response: As provided in previous responses, EP A does not believe it is appropriate to consider regulatory controls that may a pply to an area in determining
whether that area is either violat ing the NAAQS or is a nearby area contributing to a violation of the NAAQS. We note that to the extent the area has already complied with the listed requirements, the y may be generally sufficient for purposes of the revise d ozone NAAQS.

EPA appreciates that many areas have implemented measures to reduce emissions and commends these efforts. Additionally, EPA notes that there are federal measures that have and will continue to aid areas in achieving attainment of the standards and maintaining these stan dards. EPA disagrees with the c ommenter’s assertion that nonattainment designation and the time spent fulfilling its regulatory obligations do not improve air quality. To the contrary, EPA believes that efforts to attain the NAAQS as required by the CAA have provided great benefit to the citizens of the areas with air quality that do not meet air quality standards. The process provides the states with the opportunity to evaluate the causes of ozone violations and to focus resources on the types
of sourc es that are contributing to ozone nonattainment . EPA notes that no new

requ irements beyond those that the c ommenter has and is currently implementing would be required based on the classification of the Charlotte

- Rock Hill, NC

- SC as marginal for
the 2008 ozone NAAQS ; there are no new RACT or I/M requirements that would apply. To the extent measures beyond those already in place are needed to bring the area into attainment by the marginal area attainment date, the States will have significant
discretion in determining how to achieve those reductions.

3.2.4. 3

. Knoxville, TN

Tennessee C omment: Cocke County should not be designated as nonattainment. Cocke County has no significant sources of VOC or NOx and no ozone monitors. It is not adjacent to any counti es with violating monitors, and should not be designated nonattainment simply because it contains a portion of the Great Smok y Mountains
National Park.

EPA Response: The EPA agrees that Cocke County does not have a monitor that is violating the 2008 ozone NAAQS. NOx and VOC emissions from sources in Cocke County are relatively low and Cocke County’s population and VMT data are low in comparison to other counties in the area (see the discussion of Factor 2 in EPA’s TSD).
Based on an evaluation of the five f actors provided in EPA’s TSD, EPA has not included Cocke County as part of the Knoxville , TN nonattainment a rea.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 47 of 103 Tennessee Comment: Anderson County in its entirety should be designated attainment
based on 2009

- 2011 data or in the alternative only a por tion of Anderson County should be designated nonattainment. Tennessee notes that the TVA Bull Run Fossil Plant is the largest source of VOC and NO X emissions in Anderson County, and that the facility is equipped with selective catalytic reduction for NO X c ontrol. Since Anderson County is north of Loudon County and northwest of Blount and Knox Counties, and the winds are climatologically from the southwest, west

- southwest, and south

- southwest, the State requests a partial nonattainment area for Anderson Coun ty limited to the census tracts around the TVA facility. The 2008

- 2010 and 2009

- 2011design values for the Anderson County monitor show attainment.

EPA Response: EPA agrees that the air quality data from the 2008

- 2010 and 2009

- 2011
timeframes for the Ander son County monitor do not violate the 2008 ozone standard. However, there is a nearby violation of the 2008 ozone standard in Blount County. Based on an assessment of the five factors provided in EPA’s TSD, EPA agrees with
Tennessee’s alternative recommen dation of nonattainment for a portion of Anderson County. Figure 1 (under development) shows the census tracts that surround the TVA Bull Run facility which EPA is including in the nonattainment boundary. See EPA’s TSD
for additional discussion.

Tennesse e Comment: Sevier County should be treated as a stand

- alone Mi cropolitan Statistical Area. Sevier County is considered a Micropolitan Statistical Area by itself, and readings from the 2009

- 2011 monitors are indicating attainment of the ozone NAAQS.
The Co unty has little industry with the majority of the VOC and NO X emissions originating from mobile sources. This is due in part because the area is a heavy tourist destination with many out

- of

- county vehicles contributing to the VMT in the county.

EPA Respon se: EPA used CSA boundaries as the starting point for evaluating ozone areas, and for the Knoxville area, it is the Knoxville

- Sevierville

- La Follette CSA (of which Sevier County is a part). Subsequently, each of the five factors is evaluated for the
CSA. The three

- year period of the design values utilized for designations will be the same throughout an entire area. Because Tennesse e indicated that it would early certify 20011 air quality data and because it submitted such data before February 29, 2012, all
we used the 200 9

- 201 1 design values as the basis for designati ng of the Knoxville , TN
nonattainment a rea. Sevier County does not have a violating monitor b ased on 200 9

- 2011 monitoring data . Based on our five factor analysis, as provided in the TSD, we fu rther determined that the county is not contributing to the violating monitor in Blount County. Therefore, EPA is not including Sevier County in the nonattainment area boundary for
the Knoxville , TN nonattainment a rea.

Tennessee Comment: Because the mo nitor in Blount County is the only violating
monitor in the Knoxville area based on 2009

- 2011 monitoring data, Tennessee recommends only that portion of Blount County that contains the Great SmokyR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 48 of 103 Mountains National Park be designated as nonattainment. Ten nessee further asserts that the Blount County monitor is predominately impacted by long range transport.

EPA Response: EPA appreciates the updated technical information that Tennessee provided and has updated our technical support document accordingly to reflect the use
of 2009

- 2011 monitoring data for the Knoxville area. However, EPA disagrees with Tennessee’s conclusion that long range transport is the predominate cause of the violation at the Blount County monitor, and believes the technical evaluation of the area shows contribution from nearby counties to the air quality at the Blount County monitor specifically and in the Knoxville area generally. Please see our TSD for further details on our analyses.

3.2.4.4

. Greensboro

- Winston

- Salem

- High Point, NC

Comment: One c ommenter acknowledged that ozone levels in Greensboro

- Winston

Salem

- High Point, NC (CSA) have improved and that 2011 preliminary data lead s to the consideration that that metropolitan area is in attainment. However, they asked that if
EP A’s review of the preliminary data indicated that the area remains in nonattainment, they wanted EPA to include the entire metropolitan statistical area in the nonattainment designation.

EPA Response: Because North Carolina indicated that it would early certify 2011 data and because it submitted the certified data by Febr u ary 29, 2012, EPA considered air quality data form 2009

- 2011 for purposes of the final designation of the Greensboro

Winston

- Salem

- High Point, NC area. Based on the certified monitorin g information,
EPA determined that all monitors in the area are attaining the 2008 8

- hour ozone
standards and we are designating the area as unclassifiable/attainment.

3.2.4. 5

. General Comments in South Carolina

Comment: One c ommenter supports SC DHEC ’s recommendation for attainment, specifically in Spartanburg, Greenville and Anderson counties in South Carolina.

EPA Response: EPA has determined that the Greenville

- Spartanburg

- Anderson, SC area (CSA), including Spartanburg, Greenville and Anderson co unties

, is attaining the 2008 8

- hour ozone standards based on certified, quality assured 2009

- 2011 data and is therefore, being designated unclassifiable/attainment.

Comment: A citizen action group expresses concerns about the lack of ozone monitoring in Horry County, SC. The group states that ozone, and its impacts on human health were not taken into consideration when an air monitoring module at the site of a hot mix asphalt plant and nearby concrete batch plant in Conway, SC were established. The gr oup cited ozone precursors, particulates, calm wind conditions for extended periods of time,R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 49 of 103 and sunlight and heat during the ozone season in the area. They stated that Horry County is prone to traffic, brush fires, calm periods and fogs. They also stated that the only ozone monitor in Horry County, the Green Sea monitor, which has generated data for one ozone season, is being moved to the Charlotte area. They expressed concern that because no ozone data is reported, citizens are unaware when they may be ex posed to ozone’s health impacts. They would like ozone alerts at a minimum but also stated that additional research and monitoring of agricultural ozone is required. They also expressed concern about local zoning.

EPA Response: This designation action is not the appropriate place to raise comments regarding the sufficiency of the monitoring network. SC DHEC has the initial responsibility to determine the appropriate monitoring network to monitor air quality within the state of South Carolina annually. SC DHEC determines the State monitoring network in compliance with the minimum ambient air quality monitoring which is listed in the Code of Federal Regulations (CFR) specifically at 40 CFR part 58, Appendix D. Appendix D lists the factors considered when determining the minimum number of ozone monitors needed in a metropolitan statistical area (MSA). Those factors are: 1) MSA population and 2) Historical ozone concentration monitoring results for the MSA. SC DHEC monitoring network plans are subject to a 3 0

- day public comment period through the SC DHEC website ( http://www.scdhec.gov/environment/baq/ http://www.scdhec.gov/environment/baq/docs/ambientair/2012/Final_2012_Monitoring_
Plan

- with_signatures.pd f )

. Once that process is complete, the EPA reviews the State’s monitoring plan to determine if it meets the regulatory criteria listed in 40 CFR part 58, Appendix D. On October 11, 2011, EPA approved the most recent monitoring network plan for South Carol ina. The ability for SC DHEC to conduct monitoring beyond what is required in 40 CFR part 58 will depend on the resources available to the State.

3.2.5. EPA Region V

3.2.5.1. Chicago

EPA will be designating the Illinois, Indiana, and Wisconsin counties a ssociated with the Chicago

- Naperville, IL

- IN

- WI area in a separate action , no later than May 31, 2012. For this reason, comments received during the initial public comment period will be addressed in a separate response to comments document for that final action

.

3.2.5.2. General Comments in Wisconsin

Comment: A commenter asserts that, although Wisconsin’s 2011 data have not yet been certified, these data are already quality assured, and show 2009

- 2011 ozone design values
above the 2008 8

- hour ozone stan dard (75 ppb) for Kenosha, Manitowoc, and Sheboygan Counties. In addition, EPA regulations require these data to be certified by May 1, 2012, which is likely to follow very closely behind EPA’s final ozone designations.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 50 of 103 EPA Response: Quality assurance (QA) measures are periodically performed at the monitor locations according to 40 CFR part 58 to ensure that monitors are operating properly. The QA process is different than data certification. Both QA and data certification must be completed to ensure valid data. The EPA refers the comme n ter to section 3.1. 1 of this document for a discussion of EPA’s handling of 2011 data for the 2008 ozone designations process

.

Comment: Two commenters contend that past trends in ozone air quality do not support
desi gnations of attainment for Door, Kenosha, and Manitowoc Counties, despite the low
2008

- 2010 ozone design values. The available ozone data suggest that the 2008

- 2010 period is an outlier, with unusually low ozone concentrations, influenced in particular by
low ozone levels in 2008. Because the 2009

- 2011 period appears to be a more accurate reflection of the State’s progress toward attainment of the 2008 8

- hour ozone standard, it should be considered in EPA’s designation of areas for this standard. To supp ort this comment, the commenters have summarized ozone design values 24 for ozone monitors in Door, Sheboygan, Manitowoc, and Kenosha Counties for running three

- year periods
from 2000

- 2002 through 2009

- 2011. The commenters also summarized the annual
fourth

- highest daily maximum 8

- hour ozone concentrations for these counties for 2004 through 2011

EPA Response: Section 107(d)(1)(A) of the Clean Air Act defines as nonattainment “any area that does not meet (or that contributes to ambient air quality in a near by area that does not meet) the national primary or secondary ambient air quality standard....” Procedures for using air quality data to determine whether a violation of the 2008 8

- hour ozone standard has occurred are given in 40 CFR Part 50 Appendix P, as revised on march 27, 2008 (73 FR 16511). The 2008 ozone NAAQS are met at a monitor when the
annual fourth

- highest daily maximum 8

- hour average concentration, averaged over 3 years is 0.075 ppm or less. Based on 2008

- 2010 data (the most recent certified a ir quality monitoring data available for Wisconsin), the monitor in Sheboygan County is the only monitor violating the 2008 8

- hour ozone standard.

Please see section 3.1. 1 of this document for additional discussion of EPA’s handling of
2011 data for the 2 008 ozone designations process

.

With respect to Kenosha County, EPA will address the appropriate ozone designation for this county in a separate action as part of the Chicago

- Naperville, Illinois

- Indiana

Wisconsin area.

3.2.5. 3

. General Comments in Mich igan

24 Three year averages of the annual fourth

- highest daily maximum 8

- hour ozone concentrations at individual ozone monitoring sites.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 51 of 103 Comment: A commenter representing the Little River Band of Ottawa Indians (LRBOI) notes that the Manistee, Michigan ozone monitoring site (AIRS: 26

- 101

- 0922) is not a
State

- operated site, but is operated by the LRBOI. The LRBOI requests to be conta cted for any future dealings with this monitoring site.

EPA Response: EPA has been in contact with the LRBOI along with other tribes throughout the designation process and has sent letters regarding EPA’s intended designations to both states and tribes. We will continue to contact LRBOI directly with respect to issues involving the referenced ozone monitor and its associated data and with respect to the ozone designation of tribal lands.

Comment: A commenter notes that, while all ozone monitoring sit es in Michigan have
shown attainment of the 2008 8

- hour ozone standard based on the 2008

- 2010 ozone monitoring data, three monitoring sites in Michigan have recorded violations of this
ozone standard based on 2009

- 2011 monitoring data. The violating monit oring sites are: Holland (Allegan County, AIRS: 26

- 005

- 0003, 2009

- 2011 ozone design value of 79 ppb); Warren (Macomb County, AIRS: 26

- 099

- 1003, 2009

- 2011 ozone design value of 78 ppb); and, East Seven Mile (Wayne County, AIRS: 26

- 163

- 0019, 2009

- 2011 ozone design value of 76 ppb). The commenter expects the EPA to designate these monitored counties as nonattainment after Michigan has certified the 2011 ozone data in early
summer of 2012.

EPA Response: The EPA refers the comme n ter to section 3.1. 1 of this d ocument for a discussion of EPA’s handling of 2011 data for the 2008 ozone designations process

. To the extent the commenter is suggesting that EPA redesignate these counties as nonattainment after the initial designations, EPA would need to evaluate a va riety of factors before moving forward with any such action. The issue of whether an area’s initial designation should be later revised (i.e., the area should be redesignated) that is an issue that would be addressed in a separate rulemaking process and no t in this action establishing initial designations.

3.2.6. EPA Region VI

3.2.6. 1

. Dallas

- Fort Worth, TX

The EPA received comments from more than 4 0 individuals and organizations pertaining
to the Dallas

- Fort Worth (DFW) area. These comments are availabl e for review in the docket for this rulemaking.

Texas Comment : Texas Governor Rick Perry submitted a letter, dated February 29

, 2012, expressing the State of Texas’ disagree ment with the EPA’s preliminary designation of nonattainment for Hood and Wise Co unties and requesting that EPA not designate these counties as nonattainment. Texas provide d an analysis performed by the Texas Commission on Environmental Quality (TCEQ) , which cited insufficient scientificR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 52 of 103 justification to support a nonattain ment designa tion for Hood and Wise counties. Specifically, Texas comments state d that these counties do not have monitors measuring
a violation of the 2008 standard and , as such, contends that the c ounties do not significantly contribute to violations in adjacent coun ties. T he T exas comments state d that the EPA has always designated these counties as attainment/unclassifiable for ozone.
The Texas comments also stated that significant reductions in emissions of NOx in Hood
and Wise counties have occurred in the past eig ht years . The Texas comments indicate d that State permitting and rule requirements, combined with improvements in industrial equipment, are anticipated to cause emissions of NOx to decrease further and, thus,
addition al rules and programs that would be im posed on citizens and businesses are

unnecessary

. Governor Perry contends that nonattainment designations for these counties would stifle economic growth while providing little environmental benefit. The analysis performed by the TCEQ included emissions an d emissions

- related data, including decreasing emissions from oil and gas development and current state rules and permit requirements; meteorological studies; and comprehensive air quality modeling.

EPA Response : We appreciate the comments submitted by T exas . The EPA acknowledges that the air quality monitor in Hood Count y is not indicating violations of the 2008 ozone standard during 2008

– 2010 for which air quality data was reviewed and that Wise County has no air quality monitor to measure ozone conce ntrations. However, CAA Section 107(d)(1) requires all areas to be designated nonattainment if they do not meet the standard or if they contribute to ambient air quality in a nearby area that does not meet the standard. Consistent with these CAA requiremen ts for designations, it is appropriate to designate Wise C ount y as nonattainment because emissions from th is

count y contribute to violations of the NAAQS in nearby counties in the DFW area.

Upon consideration of the comments we received from the State of Texas and others, we have determined that Hood County should not be included in the nonattainment area
because its contribution to nonattainment does not warrant inclusion. We refer the State
of Texas and others to our Technical Support Document (TSD) tha t provides our reasoning for t he inclusion of Wise C ount y and the exclusion of Hood . The EPA made decisions based on criteria set forth in the CAA and in guidance documents. The rationale for our decisions about particular areas is contained in the technic al support portion of the docket. The EPA's decisions concerning nonattainment designations for the DFW area

are based on technical facts pertaining to these specific counties

, inf ormation supplied by the TCEQ , and EPA’s independent evaluation as explained in the TSD

.

Regarding designations under previous ozone standards, t he 2008 ozone standard is more stringent than the 1997 (8

- hour) and 1979 (1

- hour) ozone standards. Thus, while the EPA designated Hood and Wise counties as attainment/unclassifiable unde r these prior, less stringent ozone standards, it is not reasonable to assume that these areas would not ever
contribute to violations of a lower ozone standard.

While we app reciate concerns about the imposition of measures resulting from a
nonattainment designation that may harm economic development in affected counties, the CAA requires the EPA to designate as nonattainment any areas which are violating the NAAQS or which contribute to a violation of the NAAQS. We are not able to considerR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 53 of 103 economic impact s in our decision to designate c ounties as nonattainment, as that is not a criterion for designations under section 107(d) of the CAA . Once the designations are made, the CAA outlines the requirements in the areas designated nonattainment. At this point, w e are not addressing what CAA requirements will apply. The EPA's final
de termination for the DFW area, and our supporting analyses, are included in the TSD. In addition, t he EPA refers the comme n ter to section 3.1. 5 of this document for additional
informat ion regarding “economic harm” associated with the ozone designations process

.

Comment: After missing the statutory deadline for ozone designations, EPA is now improperly rushing the process and committing fundamental errors as a result.

EPA Response: We do not agree that we are rushing the process or that we are making errors. It is important to move forward with these designations in order for areas to begin the planning necessary to meet these public health and welfare goals. EPA gave due
consideration to the time it would need to designate areas when it entered into a consent decree which requires the Agency to issue designations by May 31, 2012.

Comment: Several c ommenters stated that EPA’s decisions to recommend Hood and
Wise counties as nonattainme nt were made with information that was inaccurate and based on incorrect assumptions , and that the data we used is out

- of

- date . Some

c ommenters specified that the EPA’s analysis of emissions data should incorporate
revisions to the 2008 NEI data that the T CEQ submitted to the EPA in October 2011.

EPA Response: The EPA disagrees that o ur decisions rely on outdated or incorrect data. The commenters did not identify the data they believed to be inaccurate or outdated, nor did they identify the assumptions the y believed to be inaccurate.

At the time we sent the 120

- day letter to Texas, we relied on the most current information
before us at that time. O ur initial analysis of emissions data included version 1.5 of the NEI for the 2008 reporting year, as well as the TCEQ’s 2009 special inventory of oil and

gas

- related emissions for the Barnett Shale formation. Subsequent to the 120

- day letter,
Texas provided additional information on the emissions inventories and we have considered that information for purposes of making our final designation decisions . We agree with commenters who recommended review of the recent emissions data revisions supplied to the NEI by the TCEQ in October 2011, and we evaluated that data before making final decisions for Hood and Wise c oun ties.

We made no changes regarding the air quality data we evaluated. Our analysis of air quality data included ambient air monitoring data for the period from 2008

– 2010, which is the most current certified data submitted to the EPA by the TCEQ. By nece ssity, the air quality data evaluated must cover a three

- year period, since the 2008 ozone NAAQS is based on a running three

- year average of the 4th highest ozone concentrations measured each year.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 54 of 103 After considering the most recent data available to us, E PA has decided to include Wise County and exclude Hood County in the Dallas

- Fort Worth, TX nonattainment area.

Comment: One c ommenter suggested that data gathered over the last couple years is skewed by drought

- related events, such as wildfires.

EPA Re sponse: The commenter did not identify the particular data believed to be
skewed. The TCEQ has not identified any of the 2008

- 2010 air quality data as being influenced by exceptional events . Thus, we have no basis to determine that such air monitoring da ta are inaccurate or skewed. Additionally, we relied on emissions data for the years 2008 and 2009, which include emissions from anthropogenic or man

- made sources only; these data do not include biogenic or naturally

- occurring emissions and this
timeframe (2008, 2009) predates recent drought and wildfire events

. Therefore, we have
no basis to determine that such emissions data are inaccurate or skewed.

Comment: S everal comment er s o ppos ed the recommended nonattainment designation of Hood County, and, in su pport of their position, noted a lack of large industrial sources and low agricultural activity in the county.

EPA Response: As discussed in our TSD, we have determined that Hood County should
not be included in the nonattainment area.

Comment : One co mmenter states that EPA did not consider emissions from the natural gas and nuclear power plants in Hood and Wise c ounties.

EPA Response : The EPA is considering emissions of ozone precursors only (NOx and VOC), as estimated in version 1.5 of the NEI for t he 2008 reporting year, as well as the TCEQ’s 2009 special inventory of oil and gas

- related emissions for the Barnett Shale formation. We reviewed the NEI for electric generation units (EGUs) in Hood County and found that emissions had been reported for th e Luminant Decordova Steam Electric Station and the Wolf Hollow EGU; in Wise County we found that emissions had been reported for the Wise County Power Company, LLC Plant. These three EGUs reported
NOx and VOC emissions. The Luminant Comanche Peak nuclear power plant did not report emissions of NOx or VOC to the NEI.

Comment: A number of organizations and individuals submitted comments that Hood and/or Wise Counties should not be designated as nonattainment because there are no
recorded violations of the o zone standard in those counties for the 2008

– 2010 period

, which is the air quality bas is for these designations. Some of these c ommenters noted the

“ good ” air quality in these counties and one commenter also stated that recent regulations affecting fuel and automobile emissions have lowered pollutant levels

.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 55 of 103 EPA Response: The EPA acknowledges that the air quality monitor in Hood County is not indicating a violation of the 2008 ozone standard during the 2008

– 2010 period and that Wise County has no air qu ality monitor to measure ozone concentrations. However, CAA Section 107(d)(1) requires all areas to be designated nonattainment if they do not meet the standard or if they contribute to ambient air quality in a nearby area that does
not meet the standard. We agree that federal engine rules have reduced automobile emissions. However, a s detailed in the TSD and c onsistent with the CAA requirements for designations, it is appropriate to designate Wise Count y as nonattainment because
emissions from th is count y contribute to violations of the NAAQS in nearby counties in
the DFW area. Upon considering additional information supplied by the State of Texas and other commenters and after completing a factor analysis, detailed in the TSD for the
Dallas

- Fort Worth, TX area, we have decided to exclude Hood County from the
nonattainment area.

Comment: Several c ommenters identified concerns regarding the accuracy or reliability of the TCEQ’s 2009 Special Inventory of Oil & Gas Sector Pneumatic Emissions, which
was inclu ded in the EPA’s evaluation of emissions data for Hood and Wise Counties.
Some of these commenters note that in October 2011, the TCEQ reported revised VOC emissions related to the oil and gas sector to the 2008 NEI that are significantly lower
than the em issions initially reported, while others referred to general decreases in oil and gas drilling and production activity and resultant emissions since 2008/2009. One

c ommenter cautioned that the TCEQ’s 2009 Special Inventory of Oil & Gas Sector
emissions is inaccurate and unreliable, citing that the emissions were self

- reported, sometimes included potential emissions instead of actual emissions, and did not undergo thorough quality assurance reviews. One commenter noted that the VOC emissions resulting from o il & gas production activities are relatively nonreactive in the photochemical generation of ground

- level ozone and that additionally the DFW area is
NOx

- limited such that VOC emissions in general do not contribute as much as NOx emissions to the generatio n of ground

- level ozone.

EPA Response: The EPA thanks the c ommenters for identifying the updated 2009 oil and gas emissions that the TCEQ reported to the NEI in October 2011

. The EPA did not
consider these data in our preliminary designation recommendatio ns. The revisions to the 2008 NEI submitted by the TCEQ reduce VOC emissions in Hood County by 808 tpy, from 9,547 tpy to 8 ,7 39 tpy and reduce the VOC emissions in Wise County by 6,048 tpy, from 23,657 tpy to 17,609 tpy. 25 EPA has since reviewed the updated emissions data reported by the TCEQ and note s that the revised numbers do not affect the ranking of the
counties for VOC emissions. EPA’s analysis indicates that even with the reduced 2009 VOC emissions data, the emissions from Wise Count y still contribut e to measured

25 These VOC em ission values were reported by TCEQ in Oct ober 2011

, in the revised emissions inventory.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 56 of 103 violations of the 2008 ozone NAAQS at monitors in neighboring counties

. In making our final decision, we considered the reduced emissions and the reduction in drilling activity
since 2009. We determined that the smaller emissions in Hood Cou nty, when considered with the longer distance from the violating monitor shows that the area should not be included in the nonattainment area. Our full analysis supporting the inclusion of Wise
Count y and exclusion of Hood County as part of the DFW nonatta inment area is in the
TSD

.

Comment: One c ommenter cautioned against unnecessarily designating Wise County as nonattainment and suggested that observed violations of the ozone standard in neighboring monitors were due more to emissions from Tarrant County than to emissions from Wise County.

EPA Response: While we agree that emissions from Tarrant County are a significant contributor to the generation of ground

- level ozone in the area, our analysis of the emissions and meteorological data indicates that emi ssions from Wise County also contribute to measured violations of the NAAQS at monitors in the area being designated
as the DFW nonattainment area

.

Comment: Numerous commenters noted that Texas did not recommend the inclusion of
Hood and/or Wise Counties in the DFW ozone nonattainment area. Some of these commenters remarked that the EPA ignored, or did not demonstrate the necessity of disregarding Texas’ nonattainment area recommendations, while others urged the EPA to
reconsider the recommendations submit ted by Texas.

EPA Response: The EPA carefully considered information submitted by Texas and other

c ommenters , as well as the CAA requirements, guidance and other relevant information,
as described in our TSD. Before making our final nonattainment designati on decision for the DFW area, we also reviewed additional information submitted by the TCEQ during the public comment period and attached to the official Texas response letter submitted by
Governor Perry on February 29, 2012.

Comment: A resident of Hood County related his experience with a gas well that was installed in 2010 within a short distance of a residential neighborhood . The resident noticed emissions in the evenings, which stopped after TCEQ inspected the site. T he

c ommenter expresse d his regret that deteriorating air quality and potential nonattainment area status are the inevitable and logical consequences of a lack of adequate air quality regulation in the area.

EPA Response: The EPA recognizes the c ommenter’s concerns.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 57 of 103 Comment: Several comme nters stated that the population and VMT data utilized by the
EPA in its five

- factor weight

- of

- evidence analysis do not support inclusion of Hood
and/or Wise Counties in the DFW ozone nonattainment area. One c ommenter notes that the population and VMT data referenced in the TSD seem speculative. Several

c ommenters point out that, although the population and VMT numbers for Hood County have increased, Hood County still ranks comparatively lower for these metrics than other counties in the DFW area, including several counties that were not recommended for
inclusion in the new DFW ozo ne nonattainment area. Several c ommenters identified two typographical error s in the TSD, in which EPA referred to a population range between “60,000 and 15,000 people” that should have been “50,000 and 150,000 people.” Finally,

one c ommenter noted that the population and VMT growth experienced by Hood County are not necessarily indicative of an increase in u rbanization of the county; the c ommenter points out that more than half of the population influx is age 55 or greater and consists mostly of retirees who do not contribute significantly to daily VMT totals because they
do not commute to work.

EPA Response: Our population and VMT data are not speculative. The p opulation data

are f rom the 2010 Census and the VMT data are from the 2008 NEI. The commenter did not provide references or data to support the assertion regarding the population influx. However, the 2010 Census indicates that 21.3 percent of the population in Hood County
is aged 65 or older. Our 120

- day recommendation that emissions from Hood County contribute to violations of the NAAQS in nearby counties wa s based on a weight

- of

evidence evaluation of five factor s: quality

- assured air monitoring data, emissions data,

meteoro logy, geography and topography, and jurisdictional boundaries. As discussed in the final TSD, upon consideration of the information received, we have determined that Hood County need not be included in the nonattainment area.

Comment: Two commenters ask that the EPA halt all permits until Limestone and/or Freestone counties have an ozone monitor installed and three years of air quality data collected. The commenter also requests that when a permit is issued, emissions data from
the area and all sources in the area be considered in the air modeling. One commenter requests that permitted facilities using “antiquated” technologies install newer controls or have their permit renewal applications denied.

EPA Response: This final action only addresses the design ation of areas for the 2008 ozone NAAQS and not the extent or scope of the monitoring network or the permitting of specific facilities

. The TCEQ has the responsibility to determine the appropriate monitoring network to monitor air quality within Texas

. The TCEQ determines the State monitoring network in compliance with the minimum ambient air quality monitoring

, which is provided at 40 CFR part 58, Appendix D. Appendix D lists the factors considered when determining the minimum number of ozone monitors need ed in a MSA.
Those factors are the MSA population and the h istorical ozone concentration monitoring
results for the MSA. The TCEQ mo nitoring network plans are subject to a 30

- day public comment period. The EPA reviews the Texas monitoring network plan base d upon the criteria listed in 40 CFR part 58, Appendix D. On December 23, 2010, EPA approved the annual air monitoring network plan for the State of Texas. The c ommenter’s concernsR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 58 of 103 relating to air quality monitoring and permitting are outside the scope of this action and
thus are not addressed here.

Comment: Several commenter s state d that the EPA failed to consider the impact of the
EPA’s new and existing air regulations that are reducing ozone precursor emissions and will result in future reductions, such as: the federal engine standards under New Source Performance Standards (NSPS) requiring stringent reductions in engine emissions from oil and gas activities in both nonattainment and attainment areas; the NSPS for the Oil and Natural Gas Sector; the Nati onal Emission Standards for Hazardous Air Pollutants (NESHAP) for Industrial, Commercial, and Institutional Boilers and Process Heaters; and the NESHAP for Stationary Reciprocating Internal Combustion Engines (RICE).

EPA Response: We agree that we did not consider the impact of new air regulations. The implementation of new and existing regulations should result in lower ozone precursor emissions in the future; however

, for purposes of designating areas, we consider whether
such areas are “ currently contrib uting ” (i.e., current activities) to violations of the 2008

ozone NAAQS and do not assess or predict future source emissions

.

Comment: One c ommenter urged the EPA to work with Hood County to pursue proactive air quality improvements in partnership with lo cal, state and private industry, to secure meaningful emissions reductions in the near term with a goal of meeting or exceeding the NAAQS for Hood County in 2012 and beyond. The c ommenter stressed
that these are emissions reductions that can be achieved no w rather than waiting for completion of a SIP. Another commenter states that Hood County submitted a written request to participate in EPA’s Ozone Advance program and is taking measurable steps
toward emissions reductions.

EPA Response: We are always open to working with s tate and local areas at their request to help evaluate and/or develop methods to improve air quality. Hood County submitted a letter to the EPA, dated April 4, 2012, expressing their desire to participate in the Ozone Advance program. 26 W e support these efforts to ensure healthy air quality for the future. As discussed in the TSD, our analysis has concluded that based on the most current information regarding emissions, Hood County need not be included in the
nonattainment area. We look fo rward to working with Hood County as it develops and implements its Ozone Advance Program.

Comment: One commenter generally stated that the EPA’s decision to designate Wise and Hood counties as nonattainment for ozone is arbitrary and capricious. The

co mmenter stated EPA’s actions in its designations for Wise and Hood Counties are inconsistent, and therefore arbitrary and capricious, when compared to the standards and

26 This letter is in the docket for this rulemaking.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 59 of 103 methods of analysis that were applied in other States by other EPA Regional Offices. Th e commenter also stated that taking into account the totality of the relevant factors set out in the Meyers Memorandum, the EPA fails to provide adequate justification for its designations in the administrative record. The commenter also stated that EPA fa iled to provide adequate support in the record to support its nonattainment designations.

EPA Response: The EPA made its designation decisions based on the CAA, guidance documents, information pertaining to the particular areas, and information supplied b y the TCEQ. Our designation decisions, and rationale and underlying data on which they are based, are fully set forth in the TSD. We disagree with the commenter that our designation criteria have been inconsistently applied and that our decisions are arbit rary and capricious. The commenter fails to point to any specific concerns to support its claim.

Comment: In its assessment of the DFW nonattainment area, the EPA incorrectly and conclusively relied on HYSPLIT modeling, while EPA’s assessment of other a reas correctly disregarded HYSPLIT modeling and, instead, used general historical wind patterns as the basis for meteorological analyses.

EPA Response: We disagree that our evaluation of HYSPLIT modeling to inform our nonattainment area designation decis ions was incorrect. In terms of identifying potential local and regional source/receptor patterns, HYSPLIT wind trajectory or other modeling

based tools are excellent tools for determining the frequencies for which areas potentially contribute to high ozon e levels and are preferred over more basic assessments of w ind speed and direction at a given point location (e.g., wind roses, or pollution roses). These
basic assessments such as wind roses are potentially misleading in cases where wind speeds are light and variable, or vary substantially across the location of the meteorological observation and the monitored high ozone concentrations. While it is true that EPA was unable to use HYSPLIT modeling to inform our decisions for all areas, we
believe that it is a valuable tool and should not be disregarded where the information is available, even if the information is not available in all areas. We refer the comme n ter to section 3.1.3 of this document for additional information regarding the use of HYSPLIT
and other meteorological data.

Comment: The EPA acted in an arbitrary and capricious manner by subjecting individual days to a hyper

- intensive HYSPLIT analysis rather than using general historical wind
data

. EPA Response: The E PA disagree s with the c ommente r

. The EPA’s wind trajectory analysis focused on days with observed exceedances of the ozone NAAQS . This methodology is both appropriate and consistent with standard meteorology assessments of frequencies for which areas potentially contribute to elevated ozone concentrations.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 60 of 103 Comment: The EPA’s reliance on HYSPLIT modeling was arbitrary and capricious and an abuse of discretion as HYSPLIT modeling is not capable of reliably tracking ozone or its precursors from one area to another.

EPA Response: The c omm enter’s statements on the applicability of back trajectories for determining potential upwind contributors to measured elevated ozone concentrations reflect a fundamentally incorrect view of the HYSPLIT model and its application. In fact,
the HYSPLIT model and other back trajectory tools are frequently used in exercises of this sort to assess possible upwind areas. The commenter provides no support for its statement that HYSPLIT is incapable of reliably tracking ozone or its precursors. In fact,
HYSPLIT is specifically designed to give an estimate of the probable path a parcel of air travels in reaching a given location at a given time. By applying HYSPLIT to show the tracks that air parcels traveled to monitors during exc e edances of the standard, HYSPIT
do es give a reliable indication of the areas that could be contributing to an exceedance. There is nothing about the meteorology and transport in the DFW area that would preclude the use of HYSPLIT in EPA’s nonattainment area designation analysis.

Comment: The EPA i ncorrectly based nonattainment designations on wind patterns even though Wise and Hood C ounties are downwind of violating monitors over 95 percent of the time, while other Regions designated counties as attainment/unclassifiable even though they were upwind of violating monitors over 20 percent of the time.

EPA Response: As an initial matter, we note that there is no bright line test for any of the five factors EPA evaluates in making designation decisions , with the exception of the presence of a violating monitor . Rather, the factors must be weighed based on the unique circumstances of each potential nonattainment area in light of the wide diversity of areas across the country. The c ommenter’s statement comparing the designation determinations
in Texas to those in other parts of the country reflects a fundamental lack of understanding of nonattainment area designation evaluations, as it focuses on the metric
of wind direction in isolation and fails to take into account that the nonattainment design ations are based on a weight

- of

- evidence analysis of multiple factors that can contribute to violations of the NAAQS.

With regard to meteorology for these counties, we note that we not only looked at wind patterns but also the more sophisticated wind traje ctory models based on days on which
elevated ozone concentrations were measured in the area ; such days are more representative of meteorological and atmospheric conditions that are conducive to the generation of ground

- level ozone and exceedances of the oz one NAAQS in the DFW

area.

Comment: The EPA incorrectly concluded that an alleged de minimis contribution by
Wise and Hood C ounties to monitor violations in nearby counties was a sufficient basis to designate those counties nonattainment . O ther counties with similar levels of contribution are designated as unclassifiable /attainment

.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 61 of 103 EPA Response: As stated above, there is no bright line for any of the factors that EPA considers in making a designation decision; rather the five factors are weighed
conside ring the unique circumstances of each nonattainment area. The commenter fails to point to any specific circumstances that it believes results in an inconsistency and therefore EPA cannot more specifically address the commenter’s concerns. The TSD provides the basis for our decision for the counties referred to by the commenter.

Comment: The EPA erred in using the OMB statistical area boundaries in its designations process. These statistical area boundaries were weighed in favor of nonattainment designati ons because the OMB boundaries have nothing to do with
assessment of real

- world local environmental conditions.

EPA Response: The commenter misrepresents how EPA considered the statistical area boundaries in its analysis. Consistent with section 107(d)(4 )( A )(iv), which applied for
areas classified as serious and above for the designations that occurred for the 1

- hour standard following enactment of the 1990 Amendments , we relied on the OMB statistical area boundaries as the presumptive starting point for our evaluation. It was not one of the five factors we weighed in determining the ultimate boundaries for a designated nonattainment area. We believe it is appropriate to identify the CSA as the starting point
for our evaluation because it is consistent wi th Congressional intent and because ground

level ozone and ozone precursor emissions are pervasive and readily transported

. Moreover, in defining statistical areas, such as CSAs, OMB looks at many criteria that are important and relevant for purposes of m aking designation decisions

. For example,

e ach CSA consists of counties containing at least one urban core plus adjacent counties that have a high degree of social and economic integration with the urban core(s) as measured by commuting ties. Thus, we be lieve these areas are an appropriate starting point for s tates and EPA to rely on for evaluating the five factors.

Comment: Numerous commenters expressed concern regarding the potential adverse economic impacts resulting from a designation of nonattainme nt for Hood and/or Wise

c ounties.

EPA Response: Please see our response to the first comment in section 3.2.6.1 of this Response to Comments document, addressing DFW. In addition, t he EPA refers the

comme n ter to section 3.1. 5 of this document for addition al information regarding questions of “economic harm” associated with the ozone designations process

.

Comment: One commenter noted that the EPA selectively chose and evaluated air quality
monito rs and data. The c ommenter specifies that it would be logica l that, if the EPA wanted to clearly demonstrate that Wise and Hood counties were truly contributing to ozone nonattainment, data from all of the adjacent monitors and not just the three
described in the TSD would have been analyzed. The c ommenter further asserts that dataR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 62 of 103 from Denton and Pilot Point monitors should have been analyzed due to prevailing winds and that the EPA does not indicate what other monitors were analyzed.

EPA Response: EPA disagrees with the c ommenter’s assertion that the choice of mo nitor sites used in the evaluation of meteorological data was designed to support a specific conclusion regarding the inclusion of Hood and Wise c ounties as part of the DFW
nonattainment area

. T he selection of monitor sites used in the analysis of the

mete orological data was based on the monitors that were measuring exceedances or violations of the NAAQS. The CAA requires that EPA designate as nonattainment any areas that are in violation of the NAAQS or that contribute to a violation of the NAAQS in nearby areas. Therefore, EPA’s evaluation of wind back trajectories to identify sources of emissions impacting ozone concentrations at monitors indicating exceedances or violations of the NAAQS was appropriate and consistent with the CAA. As discussed in
our TSD , based on comments received from the State and others, we have determined that Hood County’s contribution to violations in nearby counties is not sufficient to
warrant inclusion in the nonattainment area.

Comment: We received several comments requesting information on testing sites and testing data to show that Hood County is monitoring a violation of the NAAQS.

EPA Response: The air quality monitor for Hood County indicates that Hood County is currently in compliance with the 2008 ozone NAAQS with a 2008

- 2010 design value of 0.075 ppm. O ur proposed nonattainment designation for Hood County was not based on a violation of the NAAQS at the Hood County monitor, but rather that emissions from Hood County potentially contribute to violations of the NAAQS at mo nitors in nearby
counties. As discussed in our TSD, based on comments received from the state and others, we have determined that Hood County’s contribution to violations in nearby
counties is not sufficient to warrant inclusion in the nonattainment area.

Comments Concerning Nonattainment Designation of Counties Outside of the DFW
CSA :

Comment: S everal comment er s urg ed EPA to include the counties of Freestone, Limestone, McClennan, Navarro, and Robertson within the nonattainment boundaries of
the DFW nona ttainment area . The commenters provided data on air quality, emissions and meteorology, and information on control technologies for coal

- fired power plants, and stated that emissions of NOx from power plants in these counties contribute significantly to th e ozone levels in the DFW nonattainment area.

EPA Response: The EPA disagrees with the c ommenters that it is necessary to designate these counties as part of the DFW nonattainment area. The nonattainment designation determinations are based on a weight

- of

- evidence analysis that takes into consideration the five factors of air quality, emissions, meteorology, geography and topography, and jurisdictional boundaries. These counties are outside the DFW CSA , but we did include them in our analysis. We have not included these five counties in the DFW nonattainmentR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 63 of 103 area because the counties do not have violating monitors and because they are not nearby a county with a violating monitor. Please see our TSD for our detailed evaluation of these
counties.

Comments S upporting the Nonattainment Designations of Hood and Wise Counties:

Comment: A few commenters expressed support for including Hood and Wise c ounties
in the DFW nonattainment a r ea.

EPA Response: The EPA appreciates the comment er s ’ support. However, we hav e determined that only Wise County should be added to the nonattainment area.

3.2.6. 2

. Houston

- Galveston

- Brazoria , TX

Texas Comment: The EPA received a letter from Texas’ Governor Perry (the Texas comments), dated February 12, 2012, in which the State provided comments and additional information regarding EPA’s including Matagorda County, Texas, in the
Houston

- Galveston

- Brazoria (HGB) nonattainment area. In the letter, the State disagree s with EPA’s preliminary designation of nonattainment for Matagord a County, requests that EPA not designate the county as nonattainment and states that there is insufficient scientific justification for the EPA’s recommendation as nonattainment for the county

. The Texas comments s tate that Matagorda C ounty does not have a monitor that is measuring a violation of the 2008 standard and contends that such county does not significantly contribute to violations in adjacent counties; that significant reductions in emissions of nitrogen oxides (NOx) in Matagorda County have occu rred in the past eight years; and that State permitting and rule requirements, combined with improvements in industrial equipment, are anticipated to cause emissions of NOx to decrease further and thus, additional rules and programs that would be imposed on citizens and businesses are

unnecessary.

The Texas comments also provided an analysis performed by the Texas Commission on Environmental Quality (TCEQ) , which include d e missions and emissions

- related data; an evaluation of m ete o rolog y; and a ir quality modeling assessing the impact of county emissions (source apportionment modeling)

.

EPA Response: The EPA has reviewed all information submitted by the State of Texas and commenters during the review process and, as provided in more detail in the TSD,
has determined that Matagorda County should be excluded from the HGB nonattainment area. The EPA has, therefore, designated Matagorda County as unclassifiable/attainment.

Comment: Numerous commenters expressed concern regarding EPA’s in cluding Matagorda Coun ty, Texas in the Houston

- Galveston

- Brazoria (HGB) nonattainment areaR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 64 of 103 and oppos e a nonattainment designation for the county. C omment ers included the following information to support an unclassifiable/attainment position for Matagorda :

• Matagorda is rural wi th a population of 36,702

• Matagorda is the only county in the larger 12

- county Houston region where

pop ulation declined from 2000

- 2010

• Matagorda has the 2nd lowest VMT in the 12 county region and is the only county where VMT declined between 2002

- 2008

• Emis sions in Matagorda have declined

• EPA’s TSD fails to show that emissions from the county contribute to ozone
formation in HGB a rea for the 2008

- 2010 timeframe

EPA Response: The EPA has reviewed all information submitted by the State of Texas
and commenters during the review process and , as provided in more detail in the TSD,
has determined that Matagorda County should be excluded from the HGB nonattainment area. EPA has, therefore, designated Matagorda County as unclassifiable/attainment

.

Comment: A few c omment ers expressed support for a nonattainment designation for Matagorda County, Texas.

EPA Response: As a result of reviewing data submitted by the State of Texas and commenters during the review process, EPA has designated Matagorda County as
unclas sifiable/attainment. Please see our TSD for a detailed discussion that supports our
decision.

Comment: Comment ers identified “ flaws ” in EPA’s meteorological analysis for Texas
and stated that we inappropriately used the HYSPLIT to support designation of Hood, Wise and Matagorda counties as nonattainment. Comment ers further noted that their
review of back trajectories from 2006 to 2010 for days measuring ozone greater than 76 ppb at the Manvel Croix, Texas City and Wallisville monitors showed at most o nly 1.8% of the trajectory endpoints actually traverse Matagorda County and that on the days when Matagorda County was upwind of a violating monitor the back trajectories routinely crossed counties with far greater emissions.

EPA Response: As provided in response to comments for the DFW area (see section
3.2.6.1 of this document )

, w e disagree that the meteorological analysis was flawed and that HYSPLIT was used inappropriately. The EPA refers the comme n ter to section 3.1.3
of this document for additional information regarding the use of HYSPLIT and other meteorological data.

In these final designations, EPA has excluded Hood County as part of the DFW nonattainment area and excluded Matagorda County from the HGB nonattainment area. EPA’s full analysis is provided in the TSD.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 65 of 103 Comment: Several commenters voiced concern regarding EPA’s use of air quality and monitoring data . Some c ommenters stated that air quality data does not support a nonattainment designation for Matagorda County, Texas . One c ommenter stated that the closest two ozone monitors, in Lake Jackson and Danciger, show some of the lowest ozone levels in the region. Commenters also encouraged EPA to monitor in the county due to the presence of industrial plants in the area.

EPA Response: We agree that air quality data does not support designating Matagord a County as nonattainment because there is not a violating monitor in the County. The
basis for our decision to designate Matagorda County as unclassifiable/attainment is provided in our TSD.

As provided in EPA’s response to a comment raised by the Catawba Indian Nation in section 3.2.4.2 of this document, a separate process applies for purposes of determining the monitoring network in the State and that process includes an opportunity for p ublic
comment. I ssues regarding the scope of the air quality monitoring network are not addresse d in this designation action.

Comment: Commenters noted that the e missions i nventory for Matagorda County, Texas used by EPA is outdated, inaccurate, or indi cates that the emissions are insignificant.
C omment ers further noted that the 2008 emissions inventory for Matagorda County should be 4,079 tons/year for NOx and 18,973 tons/year for VOC.

EPA Response: Based on information provided by Texas after EPA sen t the 120

- day
letter in December 2011 , we revised the 2008 emissions inventory for Matagorda County for the analysis we relied on for our final designation decisions . The revised 2008 NOx emissions inventory is 4,079 tons/year, down from the 7,007 tons pe r year reported in the National Emissions Inventory (NEI) version1.5. The revised 2008 VOC emissions inventory is 18,973 tons/year, down from the 19,362 reported in the National Emissions Inventory (NEI) version1.5. Texas noted that in May 2010 the state submitted locally
obtained non

- road emissions data from commercial marine vessels and locomotives to the National Emissions Inventory. Th ese data were not reflected in the NEI version 1.5
that EPA used in developing our proposal for Matagorda County.

Comment: Commenters opposing the nonattainment designation for Matagorda County, Texas, stated that EPA did not consider the impact of new air regulations.

EPA Response: We agree that we did not consider the impact of new air regulations. The implement ation of new and existing regulations should result in lower ozone precursor emissions in the future; however , for purposes of designating areas, we consider whether such areas are currently contributing (i.e., current activities) to violations of the 2008

ozone NAAQS and do not assess or predict future source emissions

.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 66 of 103 Comment: Comment ers reviewing EPA’ s nonattainment proposal for Matagorda County, Texas, request ed that EPA consult with TCEQ and reconsider the intended nonattainment designation for th i s county. The c ommenter s also requested that EPA designate the county separately from the HGB nonattainment area if we decide to designate it
nonattainment

, and consider moderate regulatory measures to encourage more extensive implementation of vapor reco very technology on oil and condensate storage tanks.

EPA Response: As a result of reviewing data provided by the State of Texas and commenters during the review process, and after consideration of the most recent data available to us, we have determined t hat Matagorda County should be designated as
unclassifiable/attainment. Please see our TSD for a detailed discussi on that supports our
decision.

Separate from this rulemaking EPA has proposed regulations to reduce emissions from the oil and natural gas in dustry. More information on these proposals is available on the
EPA Oil and Natural Gas Air Pollution Standards website (www.epa.gov/airquality/oilandgas).

Comment: A c ommenter stated that NOx is the most effective component in causing ground

- level oz one in the HGB area and that other counties lie along the same Southwesterly route as Matagorda County, such as Calhoun County which has an industrial site at Point Comfort, Texas.

EPA Response: Ozone control strategies for the HGB area have focused on re ducing NOx and highly reactive VOC emissions in addition to controlling other VOCs. Calhoun County is southwest and adjacent to Matagorda County. EPA’s nonattainment designation determinations are based on a weight

- of

- evidence analysis that takes into

con sideration the five factors of air quality, emissions, meteorology, geography and topography, and jurisdictional boundaries. Calhoun County is outside the Houston CSA
and was not included as part of our initial analysis for the area, which relies on the CS A as the starting point.

Comment: Some commenters asked that EPA de lay a designation decision for Matagorda County until EPA address es uncertainty and errors associated with the data used in the designation process ; and collection of additional informati on, including sensitivity studies or other projections that demonstrate that the proposed measures to be implemented i n Matagorda County would have a significant effect on the greater Houston air quality.
Another c ommenter stated that it is unnecessary and unjustified to designate Matagorda County as nonattainment before we review the ozone standard again in 2013.

EPA Response: EPA cannot delay a designation decision for any c ounty or choose not to issue a designation at all . Under the CAA , EPA is required to designat e areas within 2 years from the date of promulgation of the revised NAAQS (CAA section 107(d)). A third year is allowed if we have insufficient information to finalize the designations. T heR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 67 of 103 8

- hour ozone NAAQS was promulgated in 2008 and EPA inv oked the 1

- year extension. Thus, area designations for the NAAQS should have been completed no later than 2011. We were sued for failing to meet that deadline and entered into a consent decree that obligated EPA to finalize designations no later than May 3 1, 2012. We note, however, the following points in response to the comments. First, as provided in previous responses, Texas provided updated data that we used for purposes of making this final designation decision. Second, we do not use modeling projectio ns, which can be time

- consuming and costly, for purposes of determining designations. However, the factors we evaluate help the Agency determine which areas have emissions that are contributing to violations at violating monitors and whether further contro ls of these emissions would provide reductions in ambient ozone levels. We note, however, that other than a few control programs mandated by the Act, the State has the choice of which sources to regulate.

As discussed in our TSD, based on comments receive d from the State and others, we have determined that Matagorda County’s contribution to violations in nearby counties is
not sufficient to warrant inclusion in the nonattainment area.

Comment: A comment was received concerning the designation for Matag orda County, Texas, asking why an economic study is not required.

EPA Response: Please s ee the response in section 3.1.5 of this document (Other General Issues) concerning the consideration of economic factors in the designation process.

Comment: Comme nt ers supporting the inclusion of Matagorda County in the HGB nonattainment area specifically identified the proposed White Stallion coal

- fired power plant in Matagorda County, Texas as a significant future source of emissions in the county . One c ommenter stated that the case for including Matagorda County in the nonattainment area is even stronger if EPA considers permitted, as well as existing sources of air pollution. The c ommenter requested that EPA deny issu ing the air permit for the proposed White S tallion Energy Center

.

EPA Response: Consistent with the CAA requirements for designations, EPA considered existing emissions but not potential future emissions in assessing whether an area is contributing to violations of the NAAQS. While EPA has expre ssed concerns about the environmental impact and permitting record of the proposed White Stallion facility, those concerns are not a factor in our designation decision for the county.

Comment: We received comments concerning Matagorda County being inclu ded in the
Houston

- Baytown

- Huntsville CSA. One c ommenter stated that “... the use of the CSA for the jurisdictional tie for Matagorda County was used incorrectly, and with disregard
of the intended direction from the OMB.”R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 68 of 103 EPA Response: The decision to incl ude Matagorda County in the Houston

- Baytown

Huntsville C SA was made by OMB. The CSA or Core

- Based Statistical Area ( CBSA ) categories are rational starting place s for evaluating what areas violate and contribute to violations of the ozone NAAQS, but they ar e not outcome determinative. We started our
evaluation for the HGB area with the counties in the Houston

- Baytown

- Huntsville CSA.
The Houston

- Baytown

- Huntsville C SA is defined by OMB using Census data and
consists of the Houston

- Sugar Land

- Baytown Metropol itan Statistical Area, the Huntsville Micropolitan Statistical Area (Walker County), and the Bay City Micropolitan Statistical Area (Matagorda County). We evaluated each county in the CSA individually and ultimately determined that 8 out of 12 counties in the CSA should be included, in whole or in part, in the Houston nonattainment area

.

Comment: Some commenters noted that the inclusion of Matagorda County, Texas in the HGB nonattainment area would be “arbitrary and capricious” and inconsistent with
EP A’s treatment of Austin, San Jacinto, and Walker Counties . The commenter further
noted that the TSD does not support a distinction between these counties and Matagorda.

EPA Response: EPA disagree s with the comment er and believes that the TSD

accompany ing the 120

- letter distinguishe d between Matagorda, Austin, San Jacinto, and
Walker Counties. However, based on updated information provided during the comment and review period, EPA has designated Matagorda County as unclassifiable/attainment.
Please see ou r TSD for our detailed evaluation

.

3.2.7. EPA Region VII

The EPA received no comments from either the public or states and tribes pertaining to the areas in Region V II.

3.2.8. EPA Region VIII

Comment: One comment l etter specifies counties in each of the Region 8 states that
should be designated as nonattainment

.

Colorado: Commenter recommends including all counties in the Denver

- Aurora

Boulder, CO Combined Statistical Area in the Denver

- Boulder

- Greeley

- Ft. Collins

Loveland, CO nonattainment area. Co mmenter further believes that to assess contribution, the EPA should include all the counties within the largest defined metropolitan statistical area, consolidated metropolitan statistical area, or combined statistical area that includes the county with t he nonattainment designation.

Utah: Commenter states that t he EPA has, so far, determined that Duchesne County and Uintah County are “unclassifiable,” because the monitors that are showing ozone atR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 69 of 103 levels above the standard are non

- regulatory monitors. Co mmenter support s EPA’s decision to apply the narrower classification “unclassifiable” in this case and is pleased that regulatory monitoring has begun in Uintah County. Given the monitored violation of the standard in very similar circumstances in Sublette County, Wyoming, it seems likely that similar unhealthy levels currently exist in these Utah counties. Commenter hope s that steps will be taken to reduce emissions of ozone precursors in these counties, so that the
monitored ozone levels will be well unde r the standard. Commenter further urge s EPA to review the data for this site to determine by 2013 whe ther these counties should be designated as nonattainment in 2013 if the data continue to show that a problem exists.

Wyoming: Commenter supports the des ignation of the identified counties in Wyoming as nonattainment areas, but recommends that the full county be included in every case, especially because of the potential growth of the oil and natural gas sources that are recognized as contributing to the c urrent violation in the Upper Green River Basis area.

EPA Response to Colorado

- related Comment : For purposes of performing our evaluation of the boundaries of a nonattainment area, we analyzed all of the counties within the Denver CSA. However, we disag ree with the commenter who appears to suggest that all of the counties within the CSA should be included as part of the designated nonattainment area. Our TSD provides a full analysis as to each county in the CSA was included or excluded as part of the De nver nonattainment area.

EPA Response to Utah

- related Comment : We note the support as well as the concerns raised by the commenter. With regard to any future modification of the unclassifiable designation for Duchesne and Uintah Counties, EPA notes we n eed to consider three full years of monitoring data from the regulatory monitor

.

EPA Response to Wyoming

- related Comment : EPA is designating all of Sublette County and parts of Lincoln and Sweetwater Counties as nonattainment as provided in
the 120

- d a y le tter . This is consistent with Wyoming’s recommendation for the nonattainment area boundary based on the technical information the state submitted along
with its recommendation letter and also consistent with the five

- factor analysis EPA provided in the TSD that accompanied its 120

- day letter

. The final TSD reflects that same analysis.

To the extent the commenter is suggesting that we include additional areas in the designated nonattainment area based on anticipated future emissions, we note that our
desi gnation decisions are based on whether an area “is contributing” to a violation of the NAAQS and not whether future actions may contribute.

Comment: Commenter specifically o bject s to EPA’s failure to address ozone monitoring
data from 2011 for a number o f areas. The EPA must ensure that the most recent air quality monitoring data is reviewed to ensure accurate area designations under the Clean
Air Act.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 70 of 103 EPA Response: The EPA refers the commenter to section 3.1.1 of this document for a
discussion of EPA’s handling of 2011 data for the 2008 ozone designations process.

C

omment: The State of Colorado’s recommended ozone boundaries for the Denver

Boulder

- Greeley

- Ft Collins

- Loveland, CO (Denver Metropolit an/North Front Range ) nonattainment area, including the counties of Douglas, Arapahoe, Jefferson, Denver, Adams, Boulder, Broomfield, Larimer, and Weld, do not include all areas that cause or contribute to violations of the 2008 ozone NAAQS, in particular portions of northern Larimer and Weld Counties and neigh boring Morgan County, yet the EPA agreed with
Colorado’s recommendation. The commenter submitted source apportionment monitoring to support the inclusion of Larimer, Weld and Morgan Counties as part of t h e nonattainment area. Commenter states that EPA “ov erlooks the degree to which nearby areas contribute to violations of the NAAQS in the Denver Metro/North Front Range region” and that “the task of the State, as well as the EPA, was not simply to identify areas in violation of the ozone NAAQS, but to also identify nearby areas that are contributing to a violation of the NAAQS.” The commenter also contends that the Rawhide Power Plant is the largest EGU source of NOx in Larimer and Weld Counties
and contributes to ozone violations at the Fort Collins West mo nitor.

EPA Response: The commenter believes that the nonattainment area boundary recommended by the state and provided in EPA’s 120

- day letter does not include all the areas that cause or contribute to violations of the 2008 ozone NAAQS and instead only
i nclude the areas violating the 2008 ozone NAAQS

. As provided in more detail in the final TSD, EPA included as part of the designated nonattainment area all areas violating the 2008 ozone standard as well as all nearby areas contributing to a violating of the 2008 ozone NAAQS at those monitors. We proposed that nine counties be in the NAA while only two , Jefferson and Douglas, of those nine counties had violating monitors

. 27 The
other seven counties were nearby areas which were considered contributors to th e violations. In particular, the commenter believes that EPA should include all of Larimer, Weld and Morgan Counties in the nonattainment area.

As to source apportionment modeling submitted by the commenter, we note that while the modeling does show limi ted contributions from emission sources in these counties on certain days, it only informs one factor. EPA’s decisions regarding designations are
based on a full analysis of the five factors , such as what the State provided in its
recommendation or that E PA provided in the TSD

.

For Larimer and Weld Counties, the state uses source apportionment (i.e., back trajectory) modeling in their TSD to show that the emission sources contributing to ozone exceedances on high ozone days are located in the southern p ortions of these counties.

27 It is worth noting that the commenter uses 2011 data that is not certified in AQS to show a violation at

the For t Collins West monitor located in Larimer County. Fort Collins West is not a violating monitor in

the 2008

- 2010 data that were used to determine the nonattainment area per EPA guidance of Sept. 22, 2011 (Implementation of the Ozone National Ambient Air Qua lity Standards).R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 71 of 103 Th is technique does not provide detail of the exact location of the emissions that are contributing to violations

, but instead attributes emission s to the southern part of the county. There are limited exceptions to this for Lari mer County where the commenter points out that modeling does, on certain days, show the largest contribution from Larimer and Weld counties coming from electric generating units (EGU) sources most of which are located in the southern portion of the countie s that EPA is designating
nonattainment . The commenter goes on to state that while the modeling grouped all EGUs in Larimer and Weld counties together, the Rawhide Power Plant (which is just outside the nonattainment area boundary) is the largest EGU sourc e of NOx in these
counties and therefore must be the main contributor.

We agree with the commenter that the source apportionment modeling indicates
contributions from EGUs on certain days where ozone levels are elevated. However, the

sam e modeling also shows that there are several high ozone days on which the majority
of contributions from Larimer and Weld counties do not come from EGUs. Rather than using source apportionment modeling alone, which can be inconclusive, to show contribution, EPA examine d contributions over a larger time period with a larger sample of high ozone days over multiple summer ozone seasons. The state’s analysis evaluated the 12 highest ozone days over a three year period. This method more closely reflects how the ozone design v alues are calculated for comparison to the health

- based NAAQS

. The trajectory analysis also demonstrates with greater specificity the areas that contribute to exceedances at the Chatfield, Rocky Flats North and Fort Collins West monitors on high ozone days . (see state of Colorado, “Technical Support Document for
Recommended 8

- hour Ozone Designations” at 29). The back trajectory analysis shows the greatest concentration of trajectories on high ozone days at the Fort Collins West monitor originating from sour ces in southwest Weld County and southeast Larimer County. Both of these areas are well within the nonattainment boundary. The contributions to exceedances at both Rocky Flats North and Chatfield are primarily from
the Denver Metro area which is also well within the boundary of the nonattainment area. This is indicated by the very low number of trajectories originating in the grid cells over Morgan County and northern portions of Larimer and Weld Counties . These analyses, as
well as trajectory modeling

, ar e discussed in greater detail in EPA’s TSD for the Denver

area.

Further, Colorado’s TSD and subsequent Supplemental Analysis for Recommended 8

- Hour Ozone Designations explain that the northern portions of Larimer and Weld Counties are rural and sparsely populated with most areas having a population density fewer than five people per square mile (state of Colorado Supplemental Analysis at 11). Similarly, Morgan County is a rural area with a population density 22.2 people per square
mile.

We agree with th e commenter that oil and gas sources in Weld County contribute to ozone violations. We believe, however, that the majority of those sources are located in the area included as part of the designated nonattainment area

. We refer the commenter to
the TSD for additional detail.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 72 of 103 Comment: The EPA’s proposed “unclassified” designation for the Uinta Basin of northeastern Utah, including the counties of Uintah and Duchesne, ignores valid air quality monitoring data that shows the region is in violation of the 2 008 ozone NAAQS

. Commenter contends that the term “non

- regulatory” does not appear in either the Clean Air Act or in regulations “governing what data can and should be utilized to determine whether an area is in violation of the NAAQS.” Commenter states t hat the term “non

regulatory” “seems to be a creative effort by the EPA to avoid making a nonattainment designation.” The commenter summarized the data from two monitors in Uintah County, Utah with data in AQS and suggests that these data must be used bec ause it meets 40 CFR part 50, Appendix P requirements.

EPA Response: There are several reasons that the EPA considers the data from the Uinta
Basin to be non

- regulatory. Two key reasons are that no Quality Assurance Project Plan (QAPP) meeting all EPA gui dance has been approved by the EPA, and that the monitoring operation is not subject to direct quality assurance oversight by any government agency. In addition to the non

- regulatory status of the monitors, the data
from the monitors for 2010 and 2011 cann ot be considered quality assured data, which is a requirement for data used by the EPA for regulatory decisions.

Commenter suggests the data in AQS must be used because it meets 40 CFR p art 50, Appendix P requirements; however, 40 CFR Part 58 requirements also must be met before data can be considered regulatory. Appendix A of that Part states that “This appendix specifies the minimum quality system requirements applicable to SLAMS [State and Local Air Monitoring Stations] air monitoring data and PSD [Prev ention of Significant Deterioration] data.” Meeting both sets of requirements (40 CFR p art 50, Appendix P and 40 CFR p art 58) ensures that the EPA makes regulatory decisions based
on valid and defensible ambient air data.

The commenter suggests that EPA created the term non

- regulatory out of convenience to allow the EPA to ignore the data in the Uinta Basin. In truth, many categories of non

regulatory data exist in AQS, including data collected using unapproved methods, monitors which do not meet siting criteria, and monitors lacking quality assurance data. For this reason, “non

- regulatory” is an established monitoring type in AQS intended to indicate those monitors which should not be used for comparison to the NAAQS in making attainment decisions. For t he Uinta Basin Unclassifiable Area in eastern Utah, the ozone data currently in AQS are non

- regulatory because of the nature of the monitoring operation and its independence from direct governmental quality assurance oversight. As a result, the monitors a re designated as non

- regulatory in AQS.

The two monitors in the Uinta Basin cited by the commenter were operated under contracts from a series of industrial entities, with 26 months of data currently shown in AQS (August 2009 through September 2011). The se operations resulted from a series of enforcement cases brought by the EPA, where the industrial entities agreed to conduct monitoring under enforcement settlement consent decrees. The original and subsequent agreements required that the air monitoring s tations “meet the siting, methodology and operational requirements of 40 CFR Part 58,” and that the monitoring data “be collected in a manner reasonably calculated to meet the EPA’s quality assurance/quality controlR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 73 of 103 (“QA/QC”) requirements of 40 CFR Part 58 , App endix . A.” The use of the term “reasonably calculated” was necessary because 40 CFR Part 58 deals with monitoring conducted as part of governmental regulatory programs, but does not deal with private endeavors such as monitoring by respondents to con sent decrees. Inherent in the regulatory structure is a system of oversight by governmental agencies (for example, oversight by the EPA of state monitoring operations conducted under grants from the EPA). The consent decrees requiring these entities to mon itor the ambient air in the Uinta Basin have not given EPA authority for oversight comparable to that authorized by the EPA through grant funding of state and local monitoring operations. Therefore, while the
ozone data from these monitors meets the requir ements of the consent decrees, the data does not meet all EPA requirements to be considered regulatory data.

Among the requirements in 40 CFR Part 58, Appendix A for an air monitoring program to collect regulatory data is a QAPP that meets the EPA Require ments for QAPPs, QA/R

5 28 , and that is approved by the EPA (or approved by an EPA grantee having an approved Quality Management Plan). The collection of data in a manner “reasonably calculated” to meet the QA/QC requirements of Part 58, Appendix A does not inherently entail writing a QAPP. A Monitoring and Quality Assurance Plan for the project, including measures “reasonably calculated” to meet the requirements of 40 CFR Part 58, Appendix A, was developed as a deliverable to the original respondent by that respondent’s contractor. However, the plan does not meet all the QA/R

- 5 requirements for a QAPP. One key area not covered by the Monitoring and Quality Assurance Plan is a mechanism for an independent quality assurance function, authorizing regulatory agen cies to direct corrective actions should quality assurance issues be identified in the monitoring program. The Monitoring and Quality Assurance Plan was reviewed, but not approved, by the EPA and the state of Utah.

As a result of the high ozone values ob served by these non

- regulatory monitors, the EPA is responding to the data by making the area an unclassifiable area for the 8

- hour ozone standard. The EPA has efforts underway to collect regulatory data in the same area in response to the non

- regulatory d ata collected, allowing future resolution of this
unclassifiable status.

In addition to the above discussion on the non

- regulatory nature of the data from the Uinta Basin, guidance provided by the EPA on September 12, 2011 (Implementation of
the Ozone Nat ional Ambient Air Quality Standard, Gina McCarthy, EPA Assistant Administrator for Air and Radiation to EPA Air Division Directors in Regions 1

- 10), stated that designations would be based on available quality assured ozone data, which in
most cases would be 2008

- 2010 data. In the case of the Uinta Basin data, raw data between August 2009 and September 2011 is currently in AQS, but quality assurance

28 EPA Requirements for Quality Assurance Project Plans, EPA QA/R

- 5, EPA/240/B

- 01/003, March 2001. http://www.epa.gov/QUALITY/qs

- docs/r5

- final.pdf

. Reissued May 31, 2006. http://www.epa.gov/QUALITY/qs

- docs/reissue.pdf

.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 74 of 103 data are only currently available for August 2009 through January 2010. The data for
most of 2010 and all of 2011 cannot be considered quality assured, so insufficient quality assured data are currently available to show a violation under 40 CFR Part 50, Appendix
P.

Comment: One commenter stated that it support s th e planned designations and urge s the EPA to mo ve forward with these designations expeditiously. However, the
commenter also suggest ed and propose d that the nonattainment boundary should

encompass the entirety of the Moxa Arch oil and gas field, which is largely or entirely
located in Lincoln County. This massive field is proposed for significant expansion,
and the Bureau of Land Management will likely release an environmental impact

statement (EIS) approving the drilling of an additional 1,861 wells later this year. The
EPA at Region 8 is closely invo lved in the development of this EIS. As was documented in the State's technical support document recommending nonattainment
status, the primary cause of the ozone problem in this area is the oil and gas industry.
The Moxa Arch field is essentially contiguo us with the large gas fields in Sublette County, such as the Pinedale Anticline and Jonah fields. Moreover, the basin topography and wind patterns make it inevitable that emitted pollutants from Moxa
Arch will intermix with pollutants generated in Sublette County, to the detriment of air quality. Thus, the Moxa Arch field should be included in the nonattainment boundaries
and the failure to fully include it currently is a significant oversight. The likelihood of
this field contributing significantly to the nonattainment status of this area is too strong

to overlook given the documented impact the oil and gas industry is having on high

ozone levels in this area. ”

EPA R esponse: As provided previously, for purposes of designations, EPA evaluates
what area “is contributing” to a violation and does not consider possible future emissions. However, a s stated above, EPA agrees with Wyoming’s technical analysis and refers the
commenter to both the EPA TSD for this area and to Wyoming’s technical analysis provided in its response to 120

- day letters for additional information as to why EPA did not include the area of the Moxa Arch field as part of the designated nonattainment area

.

Comment: “PAW agrees with the Wyoming recommended boundary and the EPA 120 day notice that the recommended nonattainment area boundary will provide the best opportunity for WY to focus resources and resolve the ozone problem in the Upper Green River Basin. Both agencies have done a sound nine

- factor analysis evaluating the most likely ozon e precursor sources, recognizing the relevant meteorology during ozone episodes, considering potential transport, and reflecting natural geographic boundaries (high mountains). The analyses consistently showed that emissions from large point
sources south of the state recommended nonattainment area boundary were not transported into the area impacted by winter ozone. The boundary was therefore defined to include those point and area emissions sources consistently constrained and transported within the ozone impacted area by local winds, and to exclude more remote sources which were never seen to transport into the ozone impacted area.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 75 of 103 Additionally, weather patterns such as prevailing winds suggest that transport of precursors from outside these boundaries d oes not contribute to ozone exceedences in Sublette County.”

EPA R esponse: Comment noted.

Wyoming Comment: In response to public comments suggesting that whole counties, rather than partial counties in Wyoming be used to define the nonattainment bounda ry, Wyoming provided a summary of the technical analysis they had provided for their initial boundary recommendation.

EPA Response : EPA notes Wyoming’s summary of prior analys e s relevant to this partial county issue and refers readers to both the EPA TS D for this area and to Wyoming’s technical analysis provided in its response to 120

- day letters for additional information.

Wyoming Comment: In response to a public comment that the Moxa Arch Oil and gas
field be included in the UGRB non

- attainment area , Wyoming summarized the prior analyses done relevant to the location of the nonattainment area border in Lincoln County. In addition Wyoming provided additional details on the trajectory analysis end points for the Wyoming TSD, new monitoring data from a n ozone monitor just east of the
Moxa Arch field, and wind roses for ozone exceedance days in the winter of 2011.

EPA Response : EPA notes the comments by Wyoming, and has incorporated the new data provided into the EPA TSD.

Wyoming Comment: The Wyo ming DEQ, Air Quality Division (DAQ), identified the longest elevated ozone event to have occurred on February 19

- 23, 2008. EPA has identified the same event to have occurred on February 19

- 24, 2008. The DEQ/AQ D requests that EPA correct these dates in t he TSD, particularly on page 10, paragraph 5, where the DEQ/AQ D is meant to be directly quoted.

EPA R esponse: Data in AQS show the following:

Date Jonah 8

- hr O3 Boulder 8

- hr O3 Daniel South OCI #3

Feb. 19, 2008 0.080 0.079 0.073 0.051

Feb. 20, 2008 0.0 75 0.079 0.075 0.072

Feb. 21, 2008 0.084 0.122 0.061 0.094

Feb. 22, 2008 0.102 0.101 0.075 0.079

Feb. 23, 2008 0.076 0.104 0.074 0.066R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 76 of 103 Feb. 24, 2008 0.065 0.078 0.070 0.053

With ozone exceedances recorded at the Boulder station on all days between Fe b ruary 19

- 24 , EPA considered the ozone episode to extend into Feb ruary 24 . EPA restored the quoted text, and noted EPA’s differing conclusion within the TSD.

Wyoming Comment: “The DEQ/AQD requests clarification of the total vehicle miles presented on pag e 9, Table 7. The EPA presented the miles in millions. However, the DEQ/DAQ calculated a significantly lower number, as can be seen on page 21, Table
5.4

- 1 of Wyoming’s recommendation document. The DEQ/AQD would appreciate a more thorough explanation of how commuting patterns were calculated so the discrepancy in numbers can be better understood.

EPA R esponse: The data in the Wyoming TSD in Table S.4

- 1 are labeled as “DVMT” or daily vehicle miles traveled. While not labeled as such in the EPA TSD, the d ata provided by EPA are from U.S. Census Bureau estimates for 2000 County

- to

- County Worker Flow ( http://www.census.gov/hhes/commuting/data/commuting.html ) and are in annual VMT. Multip lying the Wyoming values by 365 yields comparable values in the

t wo tables. The values are not identical, however, reflecting differing inputs and
calculation details.

County WY DEQ DVMT 2007 (miles) Annualize WY DEQ 2007 VMT (million miles) EPA 2008 Ann ual VMT (million miles)

Lincoln 615,113 224.5 321

Sublette 447,953 163.5 198

Sweetwater 2,667,117 973.5 787

Wyoming Comment: On the second paragraph of page 14 in EPA’s TSD, there is a portion that is intended to be a direct qote from DEQ/AQD’s recomm endation document:

An extensive series of CalDESK forward trajectory analyses were conducted for high ozone days throughout the winter days of 2008. The analyses consistently showed that emissions from large point sources south of fht state recommended

no nattainment area boundayr did not enter the aarea impacted by winter ozone. The boundary was therefore defined to include those point and area emissions sources consistently constrained and transported within the ozone impacted area by local winds, and to exclude more remote sources which were never seen to transport into the ozone impacted area.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 77 of 103 This language was not included in DEQ/AQD’s TSD, and therefore the DEQ/AQD is requesting that EPA remove the italics that indicate State’s language.

EPA R esponse : The italics have been removed in the TSD.

3.2.9. EPA Region IX

California Comment: ARB recommends Amador County be designated as a separate attainment area for ozone, based on the following information:

• Amador County and Calaveras County fall under the jurisdiction of two separate air pollution control agencies. For planning purposes, it is most efficient to have the nonattainment boundary coincide wi th the jurisdictional boundary.

• A ir quality data show a consistent decrease in 8 hour ozone concentr ations in Amador County since 2000. The apparent increase during 2008 through 2010 reflects the impact of 2008 wildfire emissions, rather than deteriorating air quality; the 2011 design value for Amador County is 0.071 ppm, which meets the
federal standar d. Given the historic trend, the design value is expected to continue decreasing, and Amador County will continue to attain the federal
standard.

• Ozone precursor emissions in Amador County are projected to continue decreasing over the next decade

. The le vel of ozone precursor emissions generated in Amador County is dwarfed by the level of emissions in the adjacent upwind counties (Sacramento, San Joa quin, and Stanislaus counties).

• High ozone concentrations in both Amador and Calaveras counties are
overwh elmed by ozone and ozone precursor emissions transported from the Sacramento, San Joaquin, and San Francisco Bay Area regions. The contribution of local emissions is insignificant on such days

.

• The primary attainment strategy for rural areas such as Amado r and Calaveras counties relies on statewide controls and control measures implemented by upwind districts. However, the local APCDs will continue to adopt and enforce
rules to reduce emissions from so urces under their jurisdiction.

In summary, t he Califo rnia Air Resources Board (ARB) commented that based on 2011 design values showing attainment with the 2008 ozone NAAQS, Amador County should be designated a separate attainment area from the existing 1997 ozone Central Mountain
C ounties nonattainment area

.

EPA Response: EPA agrees with the commenter that it is appropriate to designate only Calaveras County, where the violating monitor is located as nonattainment. The State of
California’s Air Resources Board submitted certified 2011 ozone monitoring data for Amador County prior to the February 29, 2012 deadline that EPA imposed forR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 78 of 103 considering air quality data from 2009

- 2011 for purposes of these designations . Based on these three years, the design value in Amador County is 0.071 ppm, which attains the
2 008 ozone NAAQS (0.075 ppm). The relatively low ozone precursor emissions from both counties compared to the counties in the San Joaquin Valley nonattainment area, along with region's meteorology and geography is most suggestive that the violations in
Cal averas are attributable primarily to contributions from the broader valley area. Therefore, EPA is concluding that it is appropriate to designate only Calaveras County, where the violating monitor is located, as nonattainment. For further discussion of EP A's review of the state's analysis, please see the technical analysis for Calaveras County in
the TSD for California

California Comment: ARB recommends Tuolumne County be designated as a separate attainment area for ozone, based on the following informa tion:

• Tuolumne County and Mariposa County fall under the jurisdiction of two separate air pollution control agencies. For planning purposes, it is most efficient to have the nonattainment boundary coincide wi th the jurisdictional boundary.

• Air quality data show a consistent decrease in 8 hour ozone concentrations in Tuolumne County since the early 2000s. The apparent increase during 2008 through 2010 reflects the impact of 2008 wildfire emissions, rather than deteriorating air quality.

• The 2011 design value for Tuolumne County is 0.074 ppm, which meets the federal standard. Given the historic trend, the design value is expected to continue decreasing, and Tuolumne County will continue to attain the federal
standard.

• Ozone precursor emissions in Tuolu mne County are projected to decrease over the next decade and the level of ozone precursor emissions generated in Tuolumne County is dwarfed by the level of emissions in the upwind counties
loc ated in the San Joaquin Valley.

• High ozone concentrations in b oth Tuolumne and Mariposa counties are overwhelmed by ozone and ozone precursors transported from the San Joaquin Valley. The contribution of local emissions is insignificant on such days

.

• The primary attainment strategy for rural areas such as Tuolumn e and Mariposa counties relies on statewide controls and control measures implemented by upwind districts. However, the local APCDs will continue to adopt and enforce
rules to reduce emissions from so urces under their jurisdiction.

In su mmary , ARB commen ted that based on 2011 design values showing attainment with the 2008 ozone NAAQS, Tuolumne County should be designated a separate attainment area from the existing 1997 ozone Southern Mountain Counties nonattainment area.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 79 of 103 EPA Response: EPA agrees with t he commenter that it is appropriate to designate only Mariposa County, where the violating monitor is located, as nonattainment. The State of
California’s Air Resources Board submitted certified 2011 ozone monitoring data for Tuolumne County prior to the February 29, 2012 deadline that EPA imposed for considering air quality data from 2009

- 2011 for purposes of these designations . Based on these three years, the design value in Tuolumne County is 0.074 ppm, which attains the 2008 ozone NAAQS (0.075 ppm). Our analysis of the Meteorology and Geography factors suggest s that occasional transport of ozone and/or ozone precursors between Mariposa and Tuolumne counties is possible. However, EPA cannot conclusively determine that Tuolumne County contributes to non attainment in Mariposa County. The relatively low ozone precursor emissions from both counties compared to the counties in the San Joaquin Valley nonattainment area, along with region's meteorology and geography is most suggestive that the violations in Ma riposa are attributable primarily to contributions from the broader valley area. Therefore, EPA is concluding that it is appropriate to designate only Mariposa County, where the violating monitor is located, as
nonattainment. For further discussion of EPA 's review of the state's analysis, please see
the technical analysis for Mariposa County in the TSD for California.

Campo Band of Mission Indians Comment: “The Campo Band is committed to protecting air quality on the Campo Reservation and recommends tha t the area within the external boundaries of the Reservation remain designated ‘ Attainment ’ for the 8

- hour ozone NAAQS. The Campo Reservation has been designated Attainment for the 8

- hour ozone NAAQS since 2004, and no factors have changed affecting ozone formation, or

ozone pre

- cursor formation on the Reservation or in areas near the Reservation. ” T he Campo Band prepared and submitted a factor analysis that considered air quality data and emissions, traffic and commuting patterns, population density and de gree of urbanization, meteorology, geography/topography, and jurisdictional boundaries to support its
recommendation that Indian country of the Campo Band be designated attainment for the 2008 ozone NAAQS. Campo cites (1) the lack of an air quality monito r on the Campo Reservation and a nearby monitor showing attainment with the 2008 ozone standard; (2) no emission sources on the Campo Reservation, low population and traffic; (3) meteorology that keeps the Campo Reservation free of ozone precursors; (4) hi gh elevation of the Campo Reservation compared to the air quality monitor showing nonattainment in Alpine; and (5) existing jurisdiction of the Campo Environmental Protection Agency to protect air quality on the Campo Reservation, to support its
recommenda tion attainment designation

.

EPA Response: EPA disagrees with the commenter that the five factors support designation of Campo Band of Diegueno Mission Indians of the Campo Indian
Reservation ’s (Campo) Indian country as attainment for the 2008 ozone NAAQS

. For
further discussion of Campo’s factor analysis and EPA's review of Campo’s analysis, please see the Technical Analysis for San Diego County in the Technical Support
Document for California

.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 80 of 103 Pala Band of Mission Indians Comment: T he Pala Band of Miss ion Indians (Pala, or Pala Band) recommends that the lands within the exterior boundaries of the reservation be designated as an unclassifiable/attainment area for the revised 2008 ozone NAAQS. Pala prepared and submitted a factor analysis that considere d air quality data and emissions, traffic and commuting patterns, population growth rates and patterns, meteorology, geography, and jurisdictional boundaries to support its recommendation
that Indian country of the Pala Band be designated unclassifiable/ at tainment for the 2008 ozone NAAQS. P ala cites (1) its air quality monitor that shows attainment with the 2008 ozone standard; (2) no significant emission sources on the Pala Reservation, low population, limited traffic, and limited growth; (3) winds from the south

- southwest direction; (4) location in a valley surrounded by steep mountains; and (5) jurisdiction as a Reservation with lands held in trust for the tribe by the Bureau of Indian Affairs.

EPA Response: EPA disagrees with the commenter that Indian country of the Pala Band
of Luiseno Indians of the Pala Reservation should be designated attainment/unclassifiable for the 2008 ozone NAAQS. Due to available representative data from surrounding monitors, similarities in meteorology and transport patters to the surrounding areas, the high levels of ozone in the area, and the lack of geographical or topographical barriers that would prevent transport from the San Diego County, CA nonattainment area, EPA is designating Pala’s Indian country nonattainment as part of the San Diego County nonattainment area for the 2008 ozone NAAQS. For further discussion of Pala’s factor analysis and EPA's review of Pala’s analysis, please see the Technical Analysis for San Diego County in the Technical Support Document for Ca lifornia

.

Pechanga Indian Reservation, Temecula Band of Luiseño Mission Indians Comment: “EPA recently published guidance specifically addressing its policy for designations for Tribal lands. This guidance addresses Pechanga's precise situation, where E PA has received a tribal request for separate designation. The same five factors

... are used to determine whether it is appropriate to use tribal boundaries to establish a separate nonattainment area. The principal distinction between the tribal process and t he non

- tribal process is the increased weight given to the tribal boundaries out of recognition of and respect for tribal sovereignty. If the jurisdictional boundary criterion is given its proper weight, however, and the sovereignty of the tribal governmen t is given due deference,
EPA's multi

- factor analysis, and EPA's policy for implementing the 8

- hour ozone standard in Tribal areas, supports Pechanga's preferred approach: designation of Pechanga’s tribal territory as a separate nonattainment or attainmen t area.”

EPA Response: The EPA agrees that the jurisdictional boundaries factor should bear more weight when considering whether to designate Indian country of the Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation (Pechanga) as a sepa rate nonattainment area. Therefore, EPA is designating Pechanga’s Indian country as a separate nonattainment area for the 2008 ozone NAAQS. For more information on EPA’s analysis, see the Technical Analysis for Pechanga Band of Luiseno Mission Indians of

t he Pechanga Reservation in the Technical Support Document for California.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 81 of 103 Pechanga ’s Indian country is located along the border of the South Coast Air Basin and the San Diego Air Basin in California. For air planning purposes, the Pechanga area was design ated part of the South Coast Air Basin for the one

- hour ozone standard.

The NSR “major source” permit applicability threshold for Pech anga lands is 10 tpy of
NO
x or VOCs annually, which applies in the South Coast Air Basin based on its
“extreme” classif ication. For Pechanga, this means that more sources and modifications would be subject to the highest control technology requirement (i.e., LAER) and the offsets requirement. However, this condition was to have been indirectly remedied by EPA in 2004, by c lassifying the South Coast Air Basin as “severe

- 17” for the 1997 8

- hour ozone standard and by linking the applicable NSR requirement to the new 8

- hour
ozone classification.

However, in 2006, the D.C. Circuit ruled against portions of EPA’s 2004 8

- hour Ozo ne Implementation Rule and, in effect, restored NSR applicability thresholds and emissions offsets pursuant to classifications previously in effect for the 1

- hour ozone standard. For Pechanga, the court’s decision restored the 10 tpy NSR threshold and offs et requirements (in EPA’s discussions with the Pechanga, we have referred to this as the 1

- hour relic).

More recently, in comments objecting to EPA’s August 2009 proposed “bump

- up” of the Pechanga lands, along with the rest of the South Coast Air Basin, to “extreme” for the 8

- hour ozone standard, the Pechanga expressed the concern that the reclassification will subject them once again to a 10 tpy NSR threshold. However, the effect of the D.C. Circuit’s decision means that 10 tpy is already the applicable NSR threshold and that reclassification to “extreme” will not change that fact.

On April 15, 2010, EPA finalized the final “bump

- up” notice and we deferred reclassification of the Pechanga tribal lands.

As a practical matter, whether the Pechanga Reser vation is designated as a separate nonattainment area, or as part of a larger nonattainment area, for the 2008 ozone standard, certain requirements, such as NSR, that had applied based on the inclusion of
the reservation within the South Coast Air Basin fo r the revoked 1

- hour ozone standard, will continue to apply for anti

- backsliding purposes until the area is redesignated to
"attainment" for the 2008 8

- hour ozone standard (or other ozone standard in effect at the time of redesignation). Specifically, this means that the NSR major source threshold of 10 tons per year for VOC or NOx, that applied by virtue of the "extreme" classification of
the South Coast Air Basin for the 1

- hour ozone standard, would continue to apply to new major sources and major modific ations proposed within the reservation until the area is redesignated for the current ozone standard. Once redesignated to attainment, such new major sources and modifications would be subject to PSD requirements (see 40 CFR 52.21) rather than NSR, and the applicable major source thresholds and related requirements would change accordingly.

Pechanga Indian Reservation, Temecula Band of Luiseño Mission Indians Comment: “EPA's analysis failed to substantively evaluate, much less give proper weight to, theR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 82 of 103 fifth factor in the five

- factor analy sis: Jurisdictional Boundaries. We specifically request that the analysis in the TSD be expanded to compare the case for a separate nonattainment area with the case for including Pechanga in the San Diego Nonattainment Area. We are especially interested in understanding EPA's assessment of the degree that each factor supports one case over the other, and the relative weight that EPA assigns to
each factor in this situation.”

In s ummary , P echanga requests that EPA provi de additional information clarifying the relative weight assigned to each factor in assessing whether to designate Pechanga as a separate nonattainment area or to designate Pechanga as part of the San Diego
nonattainment area.

EPA Response: EPA provides a more detailed discussion of the relative weight of each
factor in the Technical Analysis for Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation in the Technical Support Document for California

.

Table Mountain Rancheria Comment: T he Ta ble Mountain Rancheria (Table Mountain) recommended that its areas of Indian country be designated a separate unclassifiable area from the adjacent San Joaquin Valley nonattainment area. Table Mountain cited (1) lack of air quality monitors within the boun daries of Table Mountain Rancheria and nearby monitors that are not representative of air quality at Table Mountain, (2) relatively few sources of ozone precursor emissions, (3) lack of meteorological information in Table Mountain to assess fate and transp ort of emissions on or near the Tribe’s trust land, (4) geography that appears to create a natural barrier to ozone transport resulting in foothill ozone concentrations much lower than those at the San Joaquin Valley floor, and (5) separate jurisdiction an d the EPA policy that provides for areas of Indian country to be designated as unclassifiable if the area of Indian country lacks a regulatory monitor, is located within a multi

- jurisdictional area with a violating regulatory monitor that is not representa tive of Indian country.

EPA Response: EPA disagrees with the commenter that Table Mountain ’s Indian country should be designated a separate unclassifiable area from the adjacent San Joaquin Valley nonattainment area. Due to representative data from surro unding monitors, similarities in meteorology and transport patters to the surrounding area, the high levels of ozone in the area, and the lack of geographical or topographical barriers that would prevent transport from the San Joaquin Valley, EPA is design ating Table Mountain’s Indian country as nonattainment for the 2008 ozone NAAQS, as part of the San Joaquin Valley nonattainment area. For further discussion of Table Mountain’s factor analysis
and EPA's review of Table Mountain’s analysis, please see the Technical Analysis for San Joaquin Valley in the Technical Support Document for California

.

Ewiia apaayp Band of Kumeyaay Indians Comment: “The Ewiiaapaayp Band
recommends that the area within the external boundaries of the Reservation remain designated " Attainment" for the 8

- hour ozone National Ambient Air Quality Standards (NAAQS). To our knowledge, the Ewiiaapaayp Reservation has always been designatedR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 83 of 103 Attainment for the 8

- hour ozone NAAQS, and no factors have changed affecting ozone formation, or ozone precursor formation on the Reservation or in areas near the
Reservation.

The Ewiiaapaayp Indian Reservation was recognized by the EPA as excluded from the San Diego nonattainment during the 2004 designations of the 1997 standard ozone standard through Ma rch 30, 2012 according to U.S. EPA's website: "8

- Hour Ozone Nonattainment Areas, Detailed Description of Certain Area Boundaries for Partial Counties As of August 30, 2011."

The EPA preliminary conclusion to designate the Indian Country of the Ewiiaapaayp Band as nonattainment for the revised 2008 NAAQS because the [San Diego County] area violates the 2008 ozone NAAQS is in error and should be withdrawn. The Ewiiaapaayp Indian Reservation should either remain excluded from the San Diego
nonattainment area or be designated as not a nonattainment area within the exterior
boundaries of the Reservation.

The Clean Air Act requires EPA to designate any area as nonattainment if it violates a NAAQS or if it contributes to a violation in a nearby area. No air quali ty data (Factor 1) for the Reservation show a violation or contribute to a violation in a nearby area. The available conclusion is inescapable that if air quality monitors were on the Reservation the data would support the Tribes conclusion.

Emissions and emission

- related data (Factor 2) for stationary sources and population centers and traffic patterns are not available because there are no stationary sources and a population of but 10 residing seasonally on the Reservation, making designation for a

nonat tainment area unavailable.

Meteorology and weather or transport patterns (Factor 3), influenced by geography and topography (Factor 4), do not show the formation of ozone from local sources or transport. The weather on the Reservation is characterized by high wind speeds defined as a class 7 (average wind speeds in excess of 8 to 15 meters per second varying by season and time of day), which are accelerated by steep ridgelines and narrow valleys. The 10 tribal citizen home sites are seasonally occupied, an d average daily trips of
vehicle traffic are less than a handful per day.

The jurisdictional boundaries (Factor 5) associated with the County and the State are
i nappropriate for the Reservation and its tribal government. The EPA has not consulted
with the Tribe concerning jurisdiction boundary alternatives appropriate for the Tribe.

Absent new data to the contrary, the Ewiiaapaayp Indian Reservation should remain designated Attainment for the 8

- hour Ozone standard as any change from Attainment designation must be accompanied by new data indicating that the area designated is not in compliance with the NAAQS. The Ewiiaapaayp Band is confident any data collected on the Reservation will prove the tribal lands should be designated for attainment.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 84 of 103 The Ewiiaapa ayp Band also considered the following factors in making this recommendation for air quality designation for the Ewiiaapaayp Indian Reservation:

Air Quality Data . The Ewiiaapaayp Indian Reservation currently does not have an air quality monitor for ozone. The nearest air quality monitor for ozone is on the nearby La Posta Indian Reservation that shows the area is attaining air quality
standards for the new 2008 8

- hour ozone standard. This monitor is the nearest air quality monitor in the area with technica l information available. That technical information indicates compliance with the 2008 ozone standard. The nearest monitor in the area that meets EPA regulatory monitoring criteria is in Alpine, California, approximately 19 miles away, and approximately 3, 000 to 4,000 feet lower elevation at 2,000 feet above sea level. Data from this source is not representative of air quality on the Ewiiaapaayp Indian Reservation and cannot be used to assess regulatory levels on the Reservation and is not representative of air quality on the Ewiiaapaayp Indian Reservation.

Emissions related data . There are little or no emissions data on the Reservation. The nearby Campo Band of Mission Indians performed an Emissions Inventory in 2006 and found no major emissions sources wi thin 65 miles of the Campo Indian Reservation, which is less than 5 miles from the Ewiiaapaayp Indian Reservation, and no minor sources within 25 miles. The Campo Indian Reservation is more
than 35 miles from the nearest measurable emissions sources in the area.

Traffic and commuting patterns . There is no major arterial road through the Ewiiaapaayp Indian Reservation. Traffic volume is solely tribal citizen vehicle trips from the 5 tribal citizens and other family (10 total). Vehicle traffic is low
and est imated at approximately 2 vehicles per day. There is no commuter traffic, no local traffic to stores and restaurants, of which there are none in the area.

Population Density and degree of urbanization . The area is extremely rural,
with no urbanization. Po pulation density is estimated at 1 person per square mile (urban fringe is recognized as a density over 1,000 times this density). No industrial and no commercial development occur on or near the Reservation, with
no local Title V emissions sources.

Meteo rology . The prevailing winds on the Reservation are 35 to 50 mph from the west, southwest 60 % of the time, which keep the area clear of ozone pre

- cursors.

Geography/Topography . The nearest sources of ozone pre

- cursors is Alpine, approximately 19 miles aw ay, and approximately 3,000 to 4,000 feet lower elevation at 2,000 feet above sea level, and is not representative of air quality on the Ewiiaapaayp Indian Reservation. Alpine is on a ridge line 30 miles east of San Diego and is presumed to be in a zone wh ere ozone pre

- cursors and an ozone mixing zone creates significant ozone levels. Alpine is considered by environmental professionals and agencies in San Diego County to have the highest ozone levels in Eastern San Diego County. Due to the terrain and

geogr aphy in the area, technical experts presume that ozone levels peak at AlpineR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 85 of 103 and then drop off dramatically east of Alpine. Absent monitoring data to indicate otherwise, ozone levels in rural eastern San Diego County are presumed to be meeting the 2008 ozo ne standards.

The existing jurisdictional boundaries . The external boundaries of the Ewiiaapaayp Indian Reservation separates Indian Reservation land from private, state and federal lands in San Diego County. The Ewiiaapaayp Tribal Government has jurisdic tion over air quality on the Ewiiaapaayp Indian Reservation, while the State of California has jurisdiction over state and private lands outside of the Reservation, while federal agencies have jurisdiction over federal public lands outside of the Ewiiaapaa yp Indian Reservation. There is no metropolitan planning area that has jurisdiction over the Ewiiaapaayp Indian Reservation.”

In summary, the Ewiiaapaayp Band of Kumeyaay Indians (Ewiiaayaap) submitted a factor analysis to support its recommendation that the Ewiiaapaayp Reservation be designated attainment for the 2008 ozone NAAQS. Ewiiaapyaap cites (1) the lack of an air quality monitor on the Ewiiaapaayp Reservation and a nearby monitor showing attainment with the 2008 ozone standard; (2) no emission so urces on the Ewiiaapaayp Reservation, extremely low population and traffic; (3) meteorology that keeps the Ewiiaayaap Reservation free of ozone precursors; (4) high elevation of the Ewiiaapaayp Reservation compared to the air quality monitor showing nonatt ainment in Alpine; and (5) existing jurisdiction of the Ewiiaapaayp to protect air quality on the reservation, to support its recommendation that the Ewiiaapaayp be designated attainment. Ewiiaapaayp also states that no factors have changed affecting ozone formation, or ozone pre

- cursor formation on the Reservation or in areas near the Reservation since the 2004 designations.

EPA Response : EPA disagrees with the commenter that the five factors support designating the Ewiiaapaayp Reservation attainment for the 2008 ozone NAAQS, and disagrees with the commenter that the situation has not changed since 2004. This comment was received by EPA Region IX on April 4, 2012, past the deadline for tribal and state comments on the designation process. Consideration of late comments and information from tribes and states is discretionary. EPA has considered the late letter and factor analysis from Ewiiaapaayp in our response to their comment , but in the future may not consider late letters during other designation pr ocesses.

The closest ozone monitoring site to Ewiiaapaayp is operated by the La Posta Band of Mission Indians (La Posta). However, the data from this monitoring site does not meet regulatory requirements. EPA has identified issues with the La Posta dat a, including extended periods of instrument malfunctions, anomalously low ozone values that are significantly lower than expected background concentrations, and very poor completeness levels during ozone season. In 2008, the data completeness for the year was 46%; data completeness in 2009 was 32%; and data completeness in 2010 was 60%. Data are deemed complete if daily maximum 8

- hour average concentrations are available for at least 90% of the days within the ozone monitoring season, on average, for a th ree year period, with a minimum data completeness requirement in any one year of at least 75% (40 CFR part 50, Appendix P, Section 2.3.) EPA is therefore unable to use the LaR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 86 of 103 Posta data for regulatory decision

- making at this time. The San Diego Air Pollu tion Control District (APCD) operates the next closest monitoring site. It is in Alpine, California, which is located approximately 19 miles to the west

- northwest of the Ewiiaapaayp Reservation at 2,000 feet of elevation. Currently, the Alpine monitoring site is the design value site for the San Diego nonattainment area with a 2009

- 2011 design value of 0.082 parts per million (ppm). EPA believes that the Alpine monitoring site is representative of the eastern portions of San Diego County, including areas s urrounding the Ewiiaapaayp Reservation. Several studies have shown ozone transport from the South Coast air basin and the western portions of San Diego County can reach the eastern portions of San Diego County, specifically the locations surrounding the Ew iiaapaayp Reservation. The San Diego APCD also operated an ozone monitor in Descanso during a field study in the late 1980s and early 1990s. The Descanso monitoring site was located approximately nine miles to the west of the Ewiiaapaayp Reservation at 3,6 00 feet of elevation, and measured high ozone levels that were to comparable to those measured at Alpine. This further supports that there is a potential for high levels of ozone in the elevated portions of eastern San Diego County.

EPA acknowledges that Ewiiaapaayp is located in a rural area with few sources of ozone precursors and that the Ewiiaapaayp Reservation has an extremely low population density compared to other areas of San Diego County. While there are no large sources of
emissions near the Ewi iaapaayp Reservation, emissions from western San Diego County and the South Coast air basin can influence high ozone levels in the eastern portions of San Diego County.

EPA's assessment of meteorology is consistent with Ewiiaapaayp’s claim that winds are predominantly from the west and southwest, but such patterns are conducive to high levels of ozone transport to the higher

- elevation portions of eastern San Diego County and do not typically reduce ozone concentrations.

As previously discussed, the topo graphy of the area has also been considered. The Alpine monitoring site is located at 2,000 feet of elevation and the previously operated Descanso monitoring site located at 3,600 feet measured comparable values. Elevations of the Ewiiaapaayp reservation range from 4,800 feet to 6,300 feet which are similar to the elevation of the Descanso monitoring site, and therefore, it is reasonable to assume that high ozone levels can occur in these elevated portions of eastern San Diego County.
EPA also reviewed oth er sources of information that reaffirm that high levels of ozone can occur in eastern San Diego County as a result of transport from the San Diego metropolitan area and the South Coast air basin. Furthermore, there are no significant topographic barriers that separate Ewiiaapaayp from the surrounding area and no differences in meteorology or transport patterns that would suggest significant differences in air quality on tribal lands.

The jurisdictional boundaries factor is one of five factors that are co nsidered as part of the designations decision

- making process for ozone. EPA is carrying out its “Policy for Establishing Separate Air Quality Designations for Areas of Indian Country” to designate areas of Indian country for the 2008 ozone standards. The policy stresses the importance of recognizing tribal sovereignty and the jurisdictional status of Indian country in theR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 87 of 103 decision

- making process. It also articulates the circumstances under which the jurisdictional boundaries factor could carry more weight when evaluating a tribe's multi

factor analysis. In particular, it indicates that relying heavily on the jurisdiction factor to designate an area of Indian country as a separate attainment area adjacent to a nonattainment area may be justified when a regul atory monitor in Indian country demonstrates the NAAQS is met and no other emissions sources in Indian country contribute to violations in the adjacent nonattainment area based on analysis of the five factors. Ewiiaapaayp does not meet the first criterion of the policy, as it does not have a regulatory monitor or a nearby proximate regulatory monitor demonstrating the NAAQS
is met.

Due to quality assurance issues and data anomalies with La Posta’s data, EPA cannot rely on that monitor for designation pur poses. Quality

- assured data from the Alpine monitor and the Descanso monitor, as well as modeling studies of ozone in San Diego County show that the area likely experiences air quality similar to Alpine. An attainment designation is therefore not appropri ate for Ewiiaapaayp, and Ewiiaapaayp will be designated as part of the San Diego County nonattainment area.

Since 2004, EPA has lowered the 8

- hour ozone NAAQS from 0.080 ppm to 0.075 ppm.
This lower standard results in areas that may have been previousl y attainment for the old standard now being nonattainment under the new more protective standard. EPA also considered additional studies and information specific to San Diego, which provided further information regarding ozone transport and formation in t he eastern parts of the County. EPA considered this, together with the information presented above in designating Ewiiaapaayp with the San Diego County nonattainment area for the 2008 ozone NAAQS.

Ewiia apaayp Band of Kumeyaay Indians Comment: “The EPA letter to the Tribe dated December 9, 2011 that required an expression of interest by the Tribe for tribal consultation by December 23, 2011, a mere 14 days not including the delivery time for the letter, resulted in receipt and consideration of the le tter and its notice after the deadline. This is not tribal consultation as defined in the EPA Policy on Consultation and Coordination with Indian Tribes dated May 4, 2011.

The EPA policy states tribal “consultation is a process of meaningful communicatio n and coordination between EPA and tribal officials prior to EPA taking actions or implementing decisions that may affect tribes.” [EPA Policy, Article I; 1] This process is required by Executive Order 13175 that requires the EPA “have an accountable proce ss to ensure meaningful and timely input by tribal officials in the development of regulatory policies that have tribal implications.” [EPA Policy, Article II; 2] The EPA policy says “consultation should occur early enough to allow tribes the opportunity t o provide meaningful input that can be considered prior to EPA deciding whether, how, or when to act on the matter under consideration.” [EPA Policy, Article V.C.; 7] The EPA process for the nonattainment designation fails to satisfy any one of the EPA Tri bal Consultation Policy criteria.”R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 88 of 103 In summary, the Ewiiaayaap do not believe that EPA has met its obligations under the “EPA Policy for Consultation and Coordination with Indian Tribes” (Tribal Consultation Policy) or Executive Order (EO) 13175 and reques ts consultation on the 2008 ozone designation process.

EPA Response : EPA disagrees with the commenter that we did not carry out proper consultation under the Tribal Consultation Policy or EO 13175.

In October 2011, EPA Region IX sent letters offering consultation to Tribes potentially impacted by this designation process (Letter to Robert Pinto, Sr., Tribal Chairman, Ewiiaapaayp Band of Kumeyaay Indians, from Jared Blumenfeld, Regional Administrator, U.S. EPA Region IX, October 28, 2011). EPA also of fered consultation to potentially impacted tribes in the 120

- day letters sent in December (Letter to Robert Pinto, Sr., Tribal Chairman, Ewiiaapaayp Band of Kumeyaay Indians, from Jared Blumenfeld, Regional Administrator, U.S. EPA Region IX, December 9, 20 11). While the deadline in that letter for requesting consultation was only 14 days (December 23, 2011), EPA felt the deadline was the maximum amount of time possible to allow enough time to consult with tribes in a meaningful way during the 120

- day perio d.

In January and February 2012, EPA conducted consultation with nine other California tribes that requested consultation. Some of these requests were received after the December 23, 2011 deadline, but were honored by EPA. On January 12, 2012, EPA hel d consultation by conference call with representatives from the La Jolla Band of Luiseño Indians, Pala Band of Luiseño Indians of the Pala Reservation, Iiplay Nation Santa Ysabel, and Viejas (Baron Long) Group of Capitan Grande Band of Mission Indians of

t he Viejas Reservation. EPA consulted with representatives of the Pechanga Band of Luiseño Mission Indians of the Pechanga Reservation on January 12, 2012 in San Francisco, California. On January 20, 2012, EPA held consultation by conference call
with the Picayune Rancheria of Chuckchansi Indians of California and the Table Mountain Rancheria of California. On February 1, 2012, EPA consulted with the Campo Band of Diegueño Mission Indians of the Campo Reservation at the Campo Reservation. On February 27, 2012, EPA held consultation by conference call with the Soboba Band
of Luiseño Indians.

The comment and consultation request from Ewiiaapaayp were received by EPA Region IX on April 4, 2012, past the deadline (communicated in the aforementioned December 9, 2011 letter) for tribal and state comments, and tribal consultation, on the designation process. Consideration of late comments and information from tribes and states, and conducting late consultation with tribes is discretionary.

EPA has considered the late letter from Ewiiaapaayp and conducted consultation with the Tribe on April 5, 2012, but in the future, may not consider late letters or consultation requests for other designation processes.

EPA believes that our consultation process was appropr iate and consistent with the Tribal Consultation Policy and EO 13175.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 89 of 103 Morongo Band of Mission Indians Comment : Morongo Band of Mission Indians (Morongo) commented that EPA’s preliminary decision to designate the Tribe along with
the South Coast Air Basi n nonattainment area, but at a lower classification, did not adequately consider the jurisdictional factor or EPA’s Tribal Designation Policy.

EPA Response : EPA agrees with the commenter and is designating Indian country of the Morongo Band of Mission Ind ians (Morongo) as a separate nonattainment area . For further information on EPA’s analysis, see the Technical Analysis for Morongo Band of Mission Indians in the Technical Support Document for California.

Morongo’s Indian country is located in the South Coast Air Basin in California. For air planning purposes, the Morongo area was designated as part of the South Coast Air Basin
for the one

- hour ozone standard.

The NSR “major source” permit applicability threshold for Morongo lands is 10 tpy of
NOx or V OCs annually, which applies in the South Coast Air Basin based on its “extreme” classification. For Morongo, this means that more sources and modifications would be subject to the highest control technology requirement (i.e., LAER) and the offsets requirem ent. However, this condition was to have been indirectly remedied by EPA in 2004, by classifying the South Coast Air Basin as “severe

- 17” for the 1997 8

- hour ozone standard and by linking the applicable NSR requirement to the new 8

- hour
ozone classificatio n.

However, in 2006, the D.C. Circuit ruled against portions of EPA’s 2004 8

- hour Ozone Implementation Rule and, in effect, restored NSR applicability thresholds and emissions offsets pursuant to classifications previously in effect for the 1

- hour ozone s tandard. For Morongo, the court’s decision restored the 10 tpy NSR threshold and offset requirements (in EPA’s discussions with the Morongo, we have referred to this as the 1

- hour relic).

More recently, in comments objecting to EPA’s August 2009 proposed “bump

- up” of the Morongo lands, along with the rest of the South Coast Air Basin, to “extreme” for the 8

- hour ozone standard, the Morongo expressed the concern that the reclassification will subject them once again to a 10 tpy NSR threshold. However, the effect of the D.C. Circuit’s decision means that 10 tpy is already the applicable NSR threshold and that reclassification to “extreme” will not change that fact.

On April 15, 2010, EPA finalized the final “bump

- up” notice and we deferred
reclassification of the Morongo tribal lands.

As a practical matter, whether Morongo ’s Indian country is designated as a separate nonattainment area, or as part of a larger nonattainment area, for the 2008 ozone standard, certain requirements, such as NSR, that had appl ied based on the inclusion of
the reservation within the South Coast Air Basin for the revoked 1

- hour ozone standard, will continue to apply for anti

- backsliding purposes until the area is redesignated to
"attainment" for the 2008 8

- hour ozone standard (or other ozone standard in effect at the time of redesignation). Specifically, this means that the NSR major source threshold ofR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 90 of 103 10 tons per year for VOC or NOx, that applied by virtue of the "extreme" classification of
the South Coast Air Basin for the 1

- ho ur ozone standard, would continue to apply to new major sources and major modifications proposed within the reservation until the area is redesignated for the current ozone standard. Once redesignated to attainment, such new major sources and modifications would be subject to PSD requirements (see 40 CFR 52.21) rather than NSR, and the applicable major source thresholds and related requirements would change accordingly.

EPA notes that this comment was received by EPA Region IX via email on April 9, 2012,

p ast the deadline for tribal and state comments on the designation process. Consideration of late comments and information from tribes and states is discretionary. EPA has considered the late letter from Morongo, but in the future may not consider late le tters during other designation processes.

Comment: Commenter urge s EPA to group counties that are recognized parts of contiguous air districts in unified nonattainment areas and identifies Tuscan Buttes as an

area that should not be an isolated nonattai nment area above 1,800 feet, but part of a broader Sacramento Valley Air Basin nonattainment area (as California already recognizes it). Commenter states that the later approach is fully in keeping with the Clean
Air Act and represents the only way those a reas are going to reach attainment.

EPA Response: California air basins are established by the state and are used by the state to improve air quality with respect to the California Ambient Air quality Standards (CAAQS). The CAAQS cover a number of pollut ants that could be considered long

range as well as short

- range pollutants. As such, the air basins are multi

- functional and are therefore informative but not determinative with respect to EPA’s designations, which EPA undertakes on a pollutant

- by

- polluta nt basis. EPA believes that the boundary of a
nonattainment area for a short

- range pollutant such as coarse particulates (PM

- 10) or carbon monoxide (CO) would not necessarily be appropriate for a regional scale pollutant such as ozone or fine particulates (PM2.5).

EPA believes it is appropriate to designate Tuscan Buttes as a nonattainment area. As discussed in the Technical Analysis for Tehama County (Tuscan Buttes) section of the California Technical Support Document, the violating monitor is atop a m ountain at 1,877 feet. EPA expects that the mountaintop area is predominantly affected by long

range transport from the Sacramento Metro area, rather than emissions from within Tehama County or adjacent counties. Tehama County and the Sacramento Metro

non attainment area are governed by different air districts. Together, these factors support separate nonattainment areas, as was requested by the state. EPA is designating Sacramento Metro and Tehama County (Tuscan Buttes) as separate nonattainment areas.

H ow Tuscan Buttes will reach attainment of the 2008 ozone NAAQS is an implementation issue and is outside the scope of our designations process. Separately, EPA is preparing a proposed rulemaking, the “SIP Requirements” rule, that when finalized will gover n implementation of the 2008 ozone NAAQS. We note here that urban areas which may be contributing to poor air quality on the Tuscan Buttes (e.g., Butte County, Sacramento Metro nonattainment area, San Francisco Bay Area), will beR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 91 of 103 designated nonattainment for the 2008 ozone NAAQS and will be required to attain by mandatory attainment dates. Therefore, we do not agree that Tuscan Buttes, as a separate nonattainment area, would impact the area’s ability to attain the 2008 ozone NAAQS, as the commenter sugges ts.

Comment: One Commenter notes that EPA has recognized some of the broader metropolitan areas in its recommendations, but has omitted many. Clearly, the economic and transportation integration that defines a metropolitan area makes it essential that th e entire metropolitan area be included in the nonattainment area if the area is to reduce ozone levels successfully. Only by including all these sources will the states succeed in meeting the standard. To that end, the commenter recommends modifications t o the California nonattainment areas, using the geographic boundaries of the air basins as California has defined them already and the Consolidated Statistical Areas as defined by OMB, which represent the broadest economic and transportation network in eac h area.

EPA Response: The EPA refers the commenter to the response in section 3.1. 5 of this
document for a discussion of EPA’s position on presumptive boundaries. EPA also refers the commenter to the Technical Analysis for the area(s) in question in the T echnical Support Document for California.

Comment: Commenter support s EPA’s nonattainment recommendation for Amador County, Calaveras County, Mariposa County, San Luis Obispo County (eastern portion), Tuolumne County , but recommends that these areas be c onsolidated into the San Joaquin Valley Nonattainment Area. As noted in the Technical Support Document, these counties below likely have ozone levels influenced by transported ozone from the San Joaquin Valley Airshed. Commenter states that t he explanation in the Technical Support Document does not provide a sufficient justification for splitting them in to separate
nonattainment areas and i solating these nonattainment areas from such a major source of their ozone hamstrings the ability of these areas to me et the standard.

EPA Response: EPA acknowledges the commenter’s support for our nonattainment designations, but we disagree with their suggestion that mountain counties and eastern San Luis Obispo County should be added to the eight

- county San Joaquin Va lley
nonattainment area. EPA note s that the mountain counties (i.e., Amador, Calaveras, Mariposa, and Tuolumne) are neither part of the state’s San Joaquin Valley Air Basin, nor are they part of any of the OMB defined urban areas in the San Joaquin Valley . EPA disagrees that we must justify “splitting them into separate areas” and notes that the Clean Air Act does not require that areas that are both “nearby” and “contributing” to a violating area must be part of the same nonattainment area. The Act requ ires nearby, contributing areas to be designated nonattainment. Although there may be transport from the San Joaquin Valley into both San Luis Obispo County to the west and into the mountain counties to the east, we believe it is consistent with the Clean Air Act and the
five

- factor analysis prepared for each nonattainment area to designate these areas with the boundaries proposed. The EPA refers the commenter to the response in section 3.1. 5 of
this document for a discussion of EPA’s position on presumpt ive boundaries and toR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 92 of 103 Technical Analysis for the area(s) in question in the Technical Support Document for
California.

Commen t : Commenter recommends including all counties in the Sacramento

-- Arden

Arcade

-- Yuba City, CA

- NV Consolidated Metropolitan A rea and full counties in the Sacramento Valley Air Basin (i.e., Butte County, El Dorado County, Nevada County (all), Placer County (all), Sacramento County, Sutter County, Tehama County (all), Yuba County, Yolo County, Douglas County, NV ) with violating mo nitors in a broader Sacramento Valley nonattainment area. Commenter states that a bsent such a broader approach, it is hard to see how, for example, Tehama County, will reduce emissions enough to meet the standard, since the violating monitor reflects emiss ions that come from the Valley.

EPA Response: The EPA refers the commenter to the response in section 3.1. 5 of this
document for a discussion of EPA’s position on presumptive boundaries. EPA also refers the commenter to the Technical Analysis for the are a(s) in question in the Technical Support Document for California.

Comment: Commenter recommends including all counties in the San Francisco

- San
Jose

- Oakland, CA Consolidated Metropolitan Area (i.e., Alameda County, Contra Costa County, Marin County, Nap a County, San Benito County, San Francisco County, San Mateo County, Santa Clara County, Santa Cruz County, Solano County, and Sonoma County ) in the San Francisco Bay Area nonattainment area because of the interconnected economic and transportation network that exists there, as recognized in the Consolidated Metropolitan Area boundaries.

EPA Response: EPA disagrees with the commenter’s characterization that EPA is including “several counties” that are part of the OMB urban area definition in our designati on for the San Francisco Bay Area nonattainment area. OMB includes ten
counties in the San Francisco

- San Jose

- Oakland urban area and EPA includes all or portions of nine of these counties in the nonattainment area. The entireties of seven
counties

— Marin , Napa, Contra Costa, Alameda, Santa Clara, San Mateo and San
Francisco

— are included in EPA’s nonattainment boundary. Solano County, which is part of the OMB

- defined urban area, is split between two nonattainment areas. Therefore, the entirety of the cou nty is nonattainment, but the northeast part, which is under the jurisdiction of the Yolo

- Solano air district, is part of the Sacramento Metro nonattainment area. The southwestern portion of Solano County is part of the Bay Area Air Quality Management Dis trict and is included in EPA’s designation of the San Francisco Bay Area nonattainment area. Although the commenter includes Solano County in the list of counties that should be part of the San Francisco Bay Area nonattainment area, EPA believes after con sidering “nearby” and “contributing” areas, and applying the five

- factor analysis, that Yolo and Solano counties are correctly
included in the Sacramento Metro nonattainment area. We also note that the commenter has not provided additional information to support a different conclusion.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 93 of 103 Perhaps more to the commenter’s point, EPA has excluded the entirety of one county, San Benito County, and portions of other counties from the nonattainment area. To the north, EPA has split Sonoma County, with the souther n, relatively populated area being included and the northern, fairly rural area excluded. EPA believes we have justified this split in our Technical Support Document, applying our five

- factor analysis to the county. The commenter has not provided additio nal information to support a different conclusion.

In contrast, EPA has not included any portion of San Benito County in the nonattainment area. We note that San Benito County appeared on the OMB’s list of counties in the
urban area is a recent occurren ce. EPA has not seen the county listed as part of the urban area in past designations. Although EPA is confident that OMB applied its own criteria properly for its own purposes, we do not believe that at this point in time, San Benito County is a nearby, contributing area to the violations of the 2008 ozone NAAQS that primarily occur in counties to the north and east of the county. For the reasons set forth
in our five

- factor analysis of the area, EPA does not believe that San Benito County
contributes t o the violating monitors in the Bay Area. There is an ozone monitor in the county in Pinnacles National Monument, which is currently attaining the 2008 ozone
standard.

The boundary we are designating as nonattainment for the San Francisco area is the sa me boundary that was used for designations for the 1997 and the 1979 ozone NAAQS. The area is marginal nonattainment for the 2008 ozone standard, based on the area’s 2008

- 2010 monitored air quality data. EPA is designating the area based upon that data. The NAAQS is 0.075 ppm and the 2008

- 2010 three

- year average “design value” is 0.080 ppm. However, preliminary data for 2009

- 2011 shows a design value of 0.076 ppm, at the lower legal limit of what EPA must designate as nonattainment. EPA therefore reject s the commenter’s argument that adding the partial counties that EPA has excluded or San Benito County will hinder the area’s chances of attaining the 2008 ozone NAAQS.
We believe that the full five

- factor analysis supports the boundary we have establishe d
for the nonattainment area.

Comment : Commenter support s the identification of Phoenix

- Mesa

- Glendale, AZ (MSA), including Maricopa County and Pinal County as the nonattainment area ; welcome s the inclusion of the power plants in the nonattainment bounda ry recommendations ; and strongly recommend s including the entire of both identified

count ies.

EPA Response: EPA thanks the commenter for their support and agrees that the inclusion of power plants in the state’s recommended nonattainment area is a reasona ble addition to the boundary of the nonattainment area promulgated by EPA in 2004 for the 1997 ozone national ambient air quality standards (NAAQS). However, EPA disagrees with the commenter’s recommendation to include the entirety of the two affected

cou nties. These two counties, Maricopa County to the west and Pinal County to the east, are very large when compared to other counties in the United States. EPA does not believe that designating the entirety of these two large counties is warranted for ozon e in this case, since we do not believe that the scant emissions from so far away meet the Act’s requirement that a contributing nearby area be included in a nonattainment area

.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 94 of 103 Neither is the larger area recommended by the commenter consistent with EPA’s five

factor analysis presented in the TSD for the Phoenix area.

3.2.10. EPA Region X

The EPA received no comments from either the public or states and tribes pertaining to the areas in Region II.

3.2.11. Multi

- Region Areas

3.2.11.1. Memphis, TN

- MS

- A R

Arkansas Comment : A rkansas Governor Mike Beebe provided comments on February 23, 2012. Enclosed with the comment letter was Arkansas Department of Environmental Quality ’s analysis of EPA’s December 20 11, TSD

. In the letter and enclosure, Arkansas disagr ee d with the EPA’s intended designation of Crittenden County as nonattainment.

The Arkansas submittal listed numerous concerns: Regarding air quality data, the certified air monitoring data for 2008

- 2010 has a design value of 0.074 ppm, which does

not exce ed the 2008 ozone NAAQS. Regarding contribution to the violating monitor: Crittenden County does not significantly contribute to violations recorded at the Frayser
moni tor in Shelby County, Tennessee; meteorological conditions on episode days for
2008

- 2010 show that emissions from Crittenden County are unlikely to significantly
influence ozone concen trations at the Frayser monitor and t he potential for contribution from Crittenden County to the violating air monitor is “very small (with a frequency equivale nt to much less than one exceedance day per year) .” In addition, t he EPA’s TSD failed to establish significant pollutant distribution from Crittenden County that could be viewed as contributing to the exceedance of the ozone NAAQS at the Frayser monitor ; C rittenden County has a marginal and infrequent influence on ozone concentrations at the Frayser monitor ; and a probability analysis of the wind direction frequency and emissions data estimates that emissions from Crittenden County are unlikely to significa ntly influence ozone concentrations at the Frayser monitor. Regarding jurisdictional
boundaries: t here is no regulatory justification for recommending the inclusion of a county in a nonattainment area based on its classification under a previous NAAQS ; and

a s a Targeted Economic Development Zone (TEDZ) and because it conducted its own transportation conformity demonstrations, Crittenden County should be treated as a separate jurisdiction

.
In addition, the EPA has not provided a scientifically defensible bas is to determine that Crittenden County should be designated as nonattainment and thus, Crittenden County should be designated as attainment ; the rationale used to exclude from the nonattainment designation five counties in the Memphis area is also true for Crittenden County ( this includes relatively low population and urbanization, and precursor emission contribution and transport suggesting negligible contribution to the violating county ); p ursuant toR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 95 of 103 guidance on area designations for the 2008 revised ozon e standard, the EPA was to consider nine factors in determining nonattainment area boundaries, but only considered
five ; Table 5 in the EPA’s TSD for Arkansas is titled, “Traffic and Commuting Patterns,” but the TSD did not provide in formation on commuting patterns; and i t is likely that the entire Memphis TN

- MS

- AR area will be attaining the oz one standard in the near future.

EPA Response : We appreciate the comments submitted by Governor Beebe. In September 2011, the EPA invited states and tribes to update the recommendations they submitted to us in 2009 concerning the 2008 ozone standard. Prior to issuing our 120

- day letters on December 9, 2011, we did not receive communication from Arkansas indicating that a revised recommendation was desired. Thus we unde rstood at that time that the State agreed with its 2009 recommendations. Governor Beebe submitted technical information with his letter of February 13, 2012, which included, among other things, a revised recommendation that Crittenden County be designated as attainment under the 2008 ozone standard. We disagree with this recommendation for reasons
detailed below and in our TSD.

The EPA acknowledges that the air quality monitor in Crittenden County is not violating the 2008 ozone standard during 2008

– 2010 for which air quality data was reviewed. However, section 107(d)(1) of the Clean Air Act (CAA) requires all areas to be designated nonattainment if they do not meet the standard or if they contribute to ambient air quality in a nearby area that does not me et the standard. Consistent with the CAA requirements for designations, it is appropriate to designate Crittenden County as nonattainment within the Memphis TN

- MS

- AR nonattainment area because emissions from Crittenden County contribute to violations of th e NAAQS at the Frayse r monitor in Shelby County. The EPA's decisions concerning nonattainment designations for the Memphis TN

- MS

- AR area are based on criteria set forth in the CAA and in guidance
documents , and on technical facts pertaining to Crittenden C ounty. The EPA has examined the information which Governor Beebe submitted and has provided additional information developed by the EP A. Please see our TSD, which includes an evaluation of emissions and meteorological data.

We disagree that Crittenden Coun ty should be treated as a separate jurisdiction. B ecause ground

- level ozone and ozone precursor emissions are pervasive and readily transported, it is important to examine ozone

- contributing emissions across a relatively broad geographic area. Thus, f or th e Memphis TN

- MS

- AR area we considered existing jurisdictional boundaries for the purposes of providing a clearly defined legal boundary and to help identify the areas appropriate for carrying out the air quality planning and
enforcement functions for the n onattainment area. We started our evaluation for the Memphis TN

- MS

- AR area with the counties in the Memphis Metropolitan Statistical Area (MSA). In defining statistical areas

, OMB looks at many criteria that are important and relevant for purposes of makin g designation decisions. For example, each MSA consists of counties containing at least one urban core plus adjacent counties that have a high degree of social and economic integration with the urban core(s) as measured by commuting ties. The Memphis MSA i s defined by the OMB using Census data and consists of the following counties: Crittenden County (AR); Desoto, Tunica, Tate and Marshall Counties (MS); and Tipton, Shelby and Fayette Counties (TN). We evaluated each county individually , but did not recomme nd all the counties in the MSA beR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 96 of 103 included. Our use of the Memphis MSA to evaluate the boundary for the Memphis TN

MS

- AR nonattainment area is appropriate

. The guidance memo addressing area designations for the 2008 revised ozone standards
lists nine facto rs to consider when determining nonattainment area boundaries: air quality data; emissions data; population density and degree of urbanization; traffic and commuting patterns; growth rates and patterns; meteorology; geography/topography; jurisdictional bou ndaries; and level of control of emissions sources. The EPA consolidated that list into five factors, including all of the emissions related criteria under one heading. In our TSD that accompanied the 120

- day letter for this action we evaluated
all nine of the criteria, with the exception of commuting patterns and we failed to notice the incorrect heading in that section (the header has been corrected in our final TSD) . The most current data available to evaluate commuting patterns is from the 2000 census, which we felt was not recent enough to provide an accurate assessment for the area.

We disagree with the comment that the Memphis TN

- MS

- AR area will be attaining the 2008 ozone standard in the near future, because preliminary data for 2009

- 2011 shows
that the monitor in Crittenden County violates the 2008 ozone standard.

Mississippi Comment: Pursuant to section 107(d)(1)(B)(ii), EPA is required to use MSAs as the presumptive boundary only if the area will be classified as a Serious, Severe, or Extreme Are a. Based upon EPA’s proposed implementation rule, the Memphis , TN

- MS

- AR n onattainment a rea will likely be classified as Marginal. Therefore, EPA has discretion on the Memphis , TN

- MS

- AR n onattainment a rea boundary determinations.

EPA Response: The provisio ns in section 107 that addresses the use of statistical areas as the presumptive starting point for nonattainment area boundaries for serious, severe and extreme areas are (d)(4)(A)(iv) and (v). These provisions directly applied only for purposes of the initial designations for the 1

- hour standard at the time the CAA was amended in 1990. While these provisions do not directly apply to designations for a new or revised NAAQS under section 107(d)(1), we have adopted the approach of using the
OMB statistical area boundaries as a starting point for analyzing nonattainment areas for all areas designated nonattainment for both the 1997 NAAQS and now the 2008 ozone NAAQS. Although we begin our analysis by looking at all counties within the relevant
statistical a rea, in most cases the designated area is smaller because the five factor analysis that we perform (and that we encourage states to use for their recommendations) typically indicates that there is not a strong basis to conclude that some of the counties or parts of counties within the statistical area contribute to violations of the NAAQS within the area. We believe that using the statistical areas as a starting point for our evaluation is a reasonable means to ensure that the “nearby” counties most likely to contribute to a violation of the NAAQS are evaluated and it also provides a consistent and certain starting point for evaluating areas across the country.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 97 of 103 Mississippi Comment: DeSoto County was excluded from the nonattainment boundary for the Memph is , TN

- MS

- AR n onattainment a rea in 2004, as EPA determined that DeSoto County did not significantly contribute to ozone levels in the Memphis Area. Since that time, ozone concentrations have dropped significantly for all the monitors in the area, and both Crittenden and Shelby Counties have subsequently attained the 1997 ozone standard. Therefore, this exclusion did not affect the ozone concentrations. Since ozone values have declined and DeSoto County is attaining the standard, there is no

reason to rever se the previous determination.

EPA Response: The commenter is correct that Desoto County was not included within
the boundary of the for the Memphis , TN

- MS

- AR n onattainment a rea for the 1997 ozone NAAQS . However, EPA must analyze the situation anew for p urposes of the new, more stringent NAAQS promulgated in 2008, based on the most recent information now
available. There has been growth throughout the entire Memphis area since EPA last designated ozone areas and the technical information we are relying o n now, in 2012, is different than the information we relied on in 2004 for the 1997 ozone NAAQS. EPA is establishing a new designation for the 2008 ozone NAAQS; a new and separate designation in 2012 for the 2008 NAAQS is not a reversal of the earlier des ignation in 2004 for the less stringent 1997 ozone NAAQS.

Mississippi Comment: Mississippi evaluated the 9 factors in EPA’s guidance using the latest data. The analysis overwhelmingly reveals that DeSoto County does not contribute
to violation of the ozo ne standard in Crittenden and Shelby Counties.

EPA Response: EPA appreciates the updated technical information that Mississippi provided and has updated our technical support document accordingly. However, EPA disagrees with Mississippi’s conclusion, and believes the technical evaluation of DeSoto County shows contribution to the air quality in the Memphis area. Please see our TSD for further details on our analyses.

Mississippi Comment: Mississippi is committed to protecting the public health and
welfa re, and will continue to take an aggressive approach to better the air quality. Mississippi believes they can do this more effectively through extensive outreach, public education, and voluntary measures without the burden of a nonattainment designation.
A dditionally, Mississippi believes they have demonstrated their commitment in this regard through their proven track record over the last few years. With EPA having another opportunity to review the standard in 2013, Mississippi strongly believes that
EPA s hould not designate DeSoto County as nonattainment.

EPA Response: EPA appreciates and shares Mississippi’s commitment to protecting the public health and welfare. The Agency also supports Mississippi’s continued efforts regarding outreach, public educati on, and voluntary measures. However, based on the Act and EPA’s evaluation of all of the technical information available at this time, the Agency concludes that the portion of DeSoto County that is being included in theR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 98 of 103 nonattainment area boundary is a nea rby area that contribut es to the poor air quality in the Memphis , TN

- MS

- AR n onattainment a rea

.

Tennessee Comment: Tennessee believes Shelby County should be designated as attainment. Both monitors in Shelby County are attaining the 2008 ozone standard w ith
2009

- 2011 data. Using 2009

- 2011 data, t he only violating monitor in the Memphis , TN

MS

- AR n onattainment a rea is in Crittenden County, Arkansas, which is west of Shelby County. Tennessee further states that winds in this region are primarily from the south, southwest, and south

- southwest directions, and that industries in Shelby County only infrequently impact the violating monitor.

EPA Response: EPA acknowledges that Tennessee has provided certified, quality
assured air quality data for 2009

- 2011

. A rkansas, however, has not requested early
certification of their 2009

- 2011 data, and, therefore, data are preliminary and cannot be used for designations purposes. Because EPA has not received certified data from all monitors in the area, we are using 200 8

- 2010 air quality data for our analysis of the Memphis , TN

- MS

- AR area. EPA disagrees with Tennessee’s ultimate conclusion regarding the status of Shelby County. The EPA’s technical evaluation of Shelby County
shows contribution to violations of the NAAQS in the Memphis , TN

- MS

- AR area. Please see our TSD for further details on our analyses.

Tennessee Co mment: Tennessee also notes that the western boundary of Shelby County is also the western boundary of the NOx SIP Call, and that Tennessee has faithfull y implemented these requirements and will implement whatever is required by the successor to the currently stayed Cross

- State Air Pollution Rule. Tennessee further states that there are large sources in Arkansas to the west of the Memphis area which are n ot subject to the NOx SIP Call, and have done little to help the area attain. Tennessee also cites EPA modeling that shows contribution from Arkansas on Tennessee ozone.

EPA Response: EPA commends Tennessee in their efforts to implement the NOx SIP Call, and appreciates the commitment to implement future trading programs to address transport of pollutants which affects ozone levels. T here are sources outside all areas which may contribute some pollution to air quality within such areas ; not all of the

cont ribution to violations of the NAAQS is in nearby areas and not all contributions are significant enough t o include a specific area within the designated nonattainment area. Other programs in the Act, such as those required to address longer range transpor t from one State to another, are aimed at achieving reductions from sources outside the nonattainment area. The commenter did not identify any particular sources of concern. However, we note that our full evaluation, which may be found in the TSD, evalu ated contribution from all counties within the CSA; the TSD provides the basis for our
decision on which areas to include within the boundaries of the nonattainment area.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 99 of 103 Tennessee Comment: Tennessee requests that if Shelby County is included in the

non attainment area, that only the census tracts containing the City of Memphis be included in the boundary, and not the whole county. Tennessee states that 70 percent of the Shelby County population resides within city limits, and the majority of point sourc e emissions are generated within the city limits. Tennessee also states that they provided more detail on their position in the attached nine factor analysis.

EPA Response: EPA appreciates the updated technical information that Tennessee provided and we h ave updated our TSD to address the new information . However, EPA disagrees with Tennessee’s conclusion, and believes the technical evaluation of Shelby County in its entirety shows contribution to violations of the NAAQS in the Memphis
area. Please see ou r TSD for further details on our analyses.

Comment: One c ommenter asserts that EPA’s action to designate DeSoto County, Mississippi nonattainment will have significant detrimental impact on DeSoto County’s future economic development, job creation and tr ansportation activities.

EPA Response : The EPA refers the commenter to section 3.1. 5 of this document for a response regarding “economic harm” associated with the ozone designations process

.

Comment: One c ommenter claims that EPA ’s conclusion is contr ary to data submitted to EPA by Mississippi Department of Environmental Quality ( MD EQ). The c ommenter states that data submitted to EPA by MD EQ demonstrates that the DeSoto partial county
has a 6

- year average of 73 ppb for ozone which is below the 75 ppb 2008 ozone NAAQS. They state that EPA should reconsider its prelimin ary conclusion that the DeSoto p ortion should be included as part of the Memphis, TN

- MS

- AR nonattainment area, and
reevaluate the relevant data from the DeSoto p ortion on a “case

- by

- case basis” and “area

specific analyses” as indicated in EPA’s Principal Deputy Assistant Administrator Robert Meyers’ memorandum to Regional Administrators, dated December 4, 2008 ( “Meyers Memo”). The c ommenter states the 9

- factor analysis considered by EPA i s not evidenced in the portion of the DeSoto County portion and that DeSoto County does not “contribute meaningfully” to the Memphis, TN

- MS

- AR Area.

EPA Response: EPA has evaluated the information submitted by MDEQ as part of
EPA’s technical evaluation in the TSD. We agree that there are no monitors in DeSoto County indicating a violation of the 2008 ozone NAAQS. However, in addition to including in the nonattainment area those areas that are violating the NAAQS, EPA must designate as nonattainment any n earby area that is contributing to a violation.

Comment: A c ommenter supports EPA's proposal to include DeSoto County, MS as a part of the Memphis TN ozone nonattainment area. The commenter stated that it was apparent that DeSoto County was a part of th e regional air quality “picture” in the Memphis area. The c ommenter stated that many people who work in Memphis have moved to DeSoto County. They cite growth and increased number of lanes on I

- 55 due toR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 100 of 103 traffic. They also expressed concern about Memphians and Crittenden County, Arkansas citizens incurring additional medical costs due to ozone.

EPA Response: EPA acknowledges this comment and, consistent with our proposed recommendation, has made the final determination that the Memphis Metropolitan
Planni ng Organization portion of DeSoto County, Mississippi (or urbanized portion) should be included in the nonattainment boundary for the Memphis, TN

- MS

- AR area for
2008 8

- hour Ozone standard designations based on EPA’s analysis that the county is contributing to the ozone violation in the area. EPA’s Final TSD for the Memphis Area provides our full analysis

.

Comment: One commenter suggested that EPA consider a heav y duty diesel truck highway density map and a map of air quality stations for the Memphis Area for the final designation decisions regarding ozone desig nations for DeSoto County, MS.

EPA Response: EPA appreciates this additional information and consider ed this information for the determination of the final designations for the Memphis, TN

- MS

- AR

a rea , as provided in the TSD

.

3.2.11. 2

. St. Louis

- St. Charles

- Farmington, MO

- IL

Comment: A commenter asserts that EPA and the Illinois Environmental Protection Agency (IEPA) have not provided sufficient justification for including Monroe County,
Illinois in the proposed nonattainment area. The rationale for this assertion is based on the following points raised by the commenter:

● Neither EPA nor the IEPA have demonstrated, in keeping with section 107(d) of the CAA, that Monroe County is either violating the 2008 8

- hour ozone standard or contributing to a violation of this standard in a nearby area.

● EPA, in its technical suppor t document, concludes that Monroe County does not have especially high emissions or Vehicle Miles Travelled (VMT) (high traffic levels), but concludes that Monroe County should be included in the ozone
nonattainment area because it is located between St. C lair County, Illinois and Jefferson County, Missouri, both of which have comparatively high emissions and high VMT levels. The commenter believes that this is not an adequate reason for the inclusion of Monroe County in the nonattainment area, and that Mo nroe County should not be included in the nonattainment area if there is not a clear technical or programmatic basis for doing so.

● The commenter notes that, in its technical analysis, the IEPA concludes that Monroe County should be included in the nonat tainment area for the 2008 8

- hour ozone standard because Monroe County was included in the nonattainment areas
for the 1

- hour ozone standard and for the 1997 8

- hour ozone standard. The commenter asserts that IEPA does not describe how Monroe County’s stat us inR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 101 of 103 regard to the older ozone standards impacts the designation of Monroe County for
the 2008 8

- hour ozone standard. In addition, the commenter notes that EPA has proposed to redesignate Monroe County to attainment for the 1997 8

- hour ozone
standard.

T he commenter asserts that the designation of Monroe County should be based solely on the significance of its contribution to a violation of the 2008 8

- hour ozone standard within Monroe County or within a nearby area. On that basis, the evidence compiled b y the IEPA and the EPA seems to clearly indicate that there is no technical, regulatory, or programmatic basis for including Monroe County in the ozone nonattainment area.

EPA Response: We acknowledge that there is no monitored violation of the 2008 8

- ho ur ozone standard in Monroe County, however, we also note that there is no ozone monitor located in Monroe County. We also acknowledge that 2008 VOC and NO X emissions in this county were relatively low at 2,410 tons per year (tpy) of NO X and 1,551 tpy of VOC, as compared to those in other counties included in EPA’s intended St. Louis

- St.
Charles

- Farmington, MO

- IL nonattainment area. However, as indicated in EPA’s December 4, 2008 policy entitled “Area Designations for the 2008 Revised Ozone
National Ambie nt Air Quality Standards,” (designation policy) we weigh all of the
factors to establish appropriate nonattainment area boundaries. In addition to the factors noted by the commenter, we also considered emissions

- related growth rates and patterns, populati on and population growth rates, meteorology and transport patterns related to elevated ozone levels and jurisdictional boundaries.

Finally, the state of Illinois has recommended that Monroe County be included in the St.
Louis

- St. Charles

- Farmington, MO

- IL ozone nonattainment area for the 2008 8

- hour ozone standard. It is EPA’s policy to give deference to state area recommendations unless there is compelling justification for revising those recommendations. We see no compelling reason to exclude Monroe Co unty from the nonattainment area. Given all of the above, we intend to include Monroe County in the St. Louis

- St. Charles

- Farmington,
MO

- IL ozone nonattainment area for the 2008 8

- hour ozone standard.

Comment: A commenter notes that both local sourc es and transported ozone and ozone precursors contribute to ground

- level ozone formation in the St. Louis area and in the States of Missouri and Illinois. Unless all of these sources (local and regional upwind sources) are made subject to planning and cle anup requirements, Missouri and Illinois will struggle to protect public health.

In addition, the commenter notes that technical analyses used to support the Cross

- State
Air Pollution Rule recognized that states in Regions 5 and 7 contribute to ozone ai r quality problems in other parts of the United States. The commenter asserts that an updated analysis of transported ozone and ozone precursor contributions to violations of
the 2008 8

- hour ozone standard would likely show evidence of much greater, wides pread contributions to ozone air quality problems in the United States.R esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 102 of 103 The commenter supports the call of several states for the creation of a super

- regional ozone nonattainment area. The commenter urges the EPA to revisit its decision to oppose the est ablishment of such an ozone nonattainment area for the 2008 8

- hour ozone
standard.

EPA Response: While we agree with the comment er that EPA’s technical analyses used to support other rulemaking efforts shows long

- range transport from states in Regions 5 and 7 contribute to ozone air quality in areas distant from the St. Louis area, as provided in our response in section 3.1.2, we believe other provisions of the Act are the appropriate provisions to address this concern.

3.2. 11 .3. Cincinnati, OH

- KY

- IN

Kentucky C omment: There are no violating monitors in Boone, Kenton, or Campbell County. Moreover, t he emissions contribution of Boone, Campbell, and Kenton Counties to the larger Cincinnati area is negligible in comparison with the emissions for the entir e proposed nonattainment area. The combination of all emissions from the Kentucky counties is significantly below those of Ohio emissions. The population of the Kentucky counties is each less than ten percent of the population in the proposed nonattainment area, as is the associated vehicle miles traveled with impacts the mobile emissions
contribution.

Furthermore, EPA did not view each county’s contribution in relation to the entire proposed nonattainment area. EPA should also give additional consideration to the location of Kings Island Amusement Park and the traffic associated with visitors to the
local attraction.

Kentucky does not agree that using previously established nonattainment boundaries is the most effective approach.

Kentucky believes the sou th

- southwest wind direction would exonerate Campbell and Kenton counties since they are south

- southwest of two monitors in Ohio that attain the
standard.

Kentucky states the Commonwealth does not have the authority to address vehicle
emissions as it is re served for the federal government.

EPA Response: We agree that there are no violating monitors in these three counties. In fact, there are no ozone monitors in the three counties. However, we must designate as nonattainment not only those areas violating the NAAQS, but also those areas contributing to a nearby violation of the NAAQS. We have considered all of the technical information provided by the Commonwealth of Kentucky in our TSD and the TSD provides our full analysis supporting the inclusion of Bo one, Campbell and Kenton Counties as part of the designated nonattainment area. We note that while we do consider the nonattainment boundaries of an areas that was designated nonattainment forR esponses to Significant Comments 2008 Ozone N AAQS April 30, 2012

Page 103 of 103 the 1

- hour or 1997 8

- hour ozone NAAQS, that is one item that w e weigh under one of the five factors and is not controlling of our decision. To the extent Kentucky is suggesting that one factor alone supports excluding one or more of these counties from the designated nonattainment area, we disagree. In applying the 5

- factor analysis, we use a weight of evidence approach in which we balance the various factors to reach a decision. There are rare circumstances where one factor would weigh so heavily as to be the sole or primary basis for a decision. One example of suc h a case would be where a geographic feature (e.g., a mountain) prevents the transport of air pollution from an area to the violating monitor. Finally, to the extent that the Commonwealth is suggesting that we should not include the counties as part of th e nonattainment area because it does not have authority to regulate “vehicle emissions,” we disagree. The issue of who can regulate such emissions is not relevant to determining whether emissions from sources in an area contribute to a nearby violation of the NAAQS. Moreover, the Commonwealth does have authority to regulate vehicle emissions through programs such as inspection and maintenance and the clean fuel fleet program.