76336 Federal Register / Vol. 75, No. 235 / Wednesday, December 8, 2010 / Proposed Rules 

that a waiver is appropriate for purposes 

of that different ozone NAAQS. 

VI. EPA’s Proposed Action 

EPA is proposing approval of Illinois’ 

request to exempt the State’s 8-hour 

ozone nonattainment areas from the 

section 182(f) NOX RACT requirement. 

This proposed approval is based on 

EPA’s review of the evidence that the 

requirements of section 182(f)(1)(A), as 

elaborated upon in EPA’s guidance for 

section 182(f) exemptions, have been 

met for Chicago-Gary-Lake County, ILIN and St. Louis, MO-IL ozone 

nonattainment areas. In the future, if 

EPA determines that a violation of the 

1997 8-hour ozone NAAQS has 

occurred in the Chicago-Gary-Lake 

County, IL-IN area (or at the Chiwaukee 

Prairie monitoring site in Kenosha 

County, Wisconsin) or in the St. Louis, 

MO-IL area while the Illinois portions of 

these ozone nonattainment areas are 

designated as nonattainment for the 

1997 8-hour ozone NAAQS, EPA will 

take action to revoke the exemption. 

Final approval of Illinois’ NOX RACT 

exemption request would suspend a 

requirement for a NOX RACT FIP 

stemming from EPA’s March 24, 2008, 

finding of Illinois’ failure to submit the 

NOX RACT rules. The suspension 

would remain in place contingent upon 

continued attainment of the 1997 8-hour 

ozone NAAQS in the Chicago-Gary-Lake 

County, IL-IN and St. Louis, MO-IL 

areas. If EPA approves a redesignation 

request for either of these areas for the 

1997 8-hour ozone NAAQS, the NOX

RACT FIP clock will permanently stop 

at that time. If EPA determines that 

there is a violation of the 1997 8-hour 

ozone NAAQS while either of these 

areas remain designated as 

nonattainment for the 1997 8-hour 

ozone NAAQS, the NOX RACT waiver 

will no longer be applicable as of the 

effective date of any such determination 

for the violating area by EPA. At that 

time, the NOX RACT FIP requirement 

will no longer be suspended and the 

NOX RACT FIP clock will restart at the 

point at which it stopped. EPA will 

provide notice in the Federal Register of 

any such waiver revocation and of the 

restarting of the NOX RACT FIP clock. 

VII. Statutory and Executive Order 

Reviews 

Under the CAA, the Administrator is 

required to approve a SIP submission 

that complies with the provisions of the 

CAA and applicable Federal regulations. 

42 U.S.C. 7410(k); 40 CFR 52.02(a). 

Thus, in reviewing SIP submissions, 

EPA’s role is to approve State choices, 

provided that they meet the criteria of 

the CAA. Accordingly, this action 

merely approves State law as meeting 

Federal requirements and does not 

impose additional requirements beyond 

those imposed by State law. For that 

reason, this action: 

• Is not a ‘‘significant regulatory 

action’’ subject to review by the Office 

of Management and Budget under 

Executive Order 12866 (58 FR 51735, 

October 4, 1993); 

• Does not impose an information 

collection burden under the provisions 

of the Paperwork Reduction Act (44 

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

• Is certified as not having a 

significant economic impact on a 

substantial number of small entities 

under the Regulatory Flexibility Act (5 

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

• Does not contain any unfunded 

mandate or significantly or uniquely 

affect small governments, as described 

in the Unfunded Mandates Reform Act 

of 1995 (Pub. L. 104–4); 

• Does not have Federalism 

implications as specified in Executive 

Order 13132 (64 FR 43255, August 10, 

1999); 

• Is not an economically significant 

regulatory action based on health or 

safety risks subject to Executive Order 

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

• Is not a significant regulatory action 

subject to Executive Order 13211 (66 FR 

28355, May 22, 2001); 

• Is not subject to requirements of 

Section 12(d) of the National 

Technology Transfer and Advancement 

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

application of those requirements would 

be inconsistent with the CAA; and 

• Does not provide EPA with the 

discretionary authority to address, as 

appropriate, disproportionate human 

health or environmental effects, using 

practicable and legally permissible 

methods, under Executive Order 12898 

(59 FR 7629, February 16, 1994). 

In addition, this rule does not have 

Tribal implications as specified by 

Executive Order 13175 (65 FR 67249, 

November 9, 2000), because the SIP is 

not approved to apply in Indian country 

located in the State, and EPA notes that 

it will not impose substantial direct 

costs on Tribal governments or preempt 

Tribal law. 

List of Subjects in 40 CFR Part 52 

Environmental protection, Air 

pollution control, Intergovernmental 

relations, Nitrogen dioxide, Ozone, 

Volatile organic compounds. 

Dated: November 23, 2010. 

Susan Hedman, 

Regional Administrator, Region 5. 

[FR Doc. 2010–30840 Filed 12–7–10; 8:45 am] 

BILLING CODE 6560–50–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 58 

[EPA–HQ–OAR–2006–0735; FRL–9236–4] 

Notice of Data Availability Regarding 

Two Studies of Ambient Lead 

Concentrations Near a General 

Aviation Airport 

AGENCY: Environmental Protection 

Agency (EPA). 

ACTION: Notice of Data Availability 

(NODA). 

SUMMARY: The EPA issued a final rule 

on November 12, 2008, (effective date 

January 12, 2009) that revised the 

primary and secondary National 

Ambient Air Quality Standards 

(NAAQS) for lead and associated 

monitoring requirements. On December 

30, 2009, EPA proposed revisions to the 

lead monitoring requirements. As part 

of the proposed revisions, EPA 

proposed requiring monitoring near 

general aviation airports estimated to 

have lead emissions of 0.50 tons per 

year or greater. After the proposal was 

published, EPA completed a study of 

ambient lead concentrations near a 

general aviation airport which may be 

referenced by the EPA in preparing the 

final lead monitoring requirements. In 

addition, a final report on one of the 

studies relied on in the proposed rule 

has become available. This action 

announces the availability of these two 

studies in the Revision to Lead Ambient 

Air Monitoring Requirements docket 

(EPA–HQ–OAR–2006–0735). 

FOR FURTHER INFORMATION CONTACT: For 

questions regarding the additional data, 

contact Kevin Cavender, Air Quality 

Assessment Division, C304–06, 

Environmental Protection Agency, U.S. 

EPA (C304–06), AQAD/AAMG, 

Research Triangle Park, NC 27711; 

telephone number: 919–541–2364; fax 

number: 919–541–1903; e-mail address: 

cavender.kevin@epa.gov. 

SUPPLEMENTARY INFORMATION: 

I. What is today’s action? 

This action announces the availability 

of two studies that contain information 

on ambient lead concentrations near an 

airport that has lead emissions from the 

combustion of leaded aviation fuel. The 

first is a local-scale airport modeling 

and monitoring study conducted by the 

EPA to investigate near-source ambient 

lead concentrations attributable to lead 

from the combustion of leaded aviation 

gasoline (EPA, 2010). The second is a 

final report documenting the study 

relied on in the proposed rule which 

was used to identify airports as having 


jlentini on DSKJ8SOYB1PROD with PROPOSALS
Federal Register / Vol. 75, No. 235 / Wednesday, December 8, 2010 / Proposed Rules 76337 

the potential to exceed the lead NAAQS 

(South Coast Air Quality Management 

District, 2010). Both studies are located 

in Docket ID No. EPA–HQ–OAR–2006– 

0735. 

II. How does this information relate to 

the Proposed Rule—revisions to lead 

ambient air monitoring requirements? 

These two studies provide 

information on the potential for lead 

emissions from the combustion of 

leaded aviation fuel at airports to exceed 

the lead NAAQS as well as other 

information (locations of maximum 

emissions and lead concentration 

gradients) that may be referenced in the 

final rule. 

The first study developed and 

evaluated an air quality modeling 

approach that could be used to evaluate 

local-scale concentrations of lead in the 

vicinity of an airport where pistonengine aircraft are operated. The study 

also included an assessment of the 

maximum 3-month average lead 

concentration and model sensitivity 

tests. The maximum 3-month average 

lead concentration was evaluated in 

order to compare the model output with 

the NAAQS for lead, 0.15 μg/m3, 

reported as the maximum 3-month 

average concentration. 

Air monitoring was conducted to 

evaluate the performance of the air 

modeling approach, to assist in the 

quantification of the contribution of 

lead from general aviation emissions to 

local air quality, and to provide 

information about the change in lead 

concentrations with distance from the 

airport. Air quality modeling was 

conducted using EPA’s American 

Meteorological Society/Environmental 

Protection Agency Regulatory Model or 

AERMOD. Inputs to the model included 

a comprehensive lead emission 

inventory incorporating on-site, time-inmode and sub-daily activity data for 

piston engine aircraft. Model inputs also 

included considerations of aircraftinduced wake turbulence, plume rise of 

the aircraft exhaust, and allocation of 

approach and climb-out emissions to 50 

meter increments in altitude. 

To evaluate the modeling approach 

used here, ambient lead concentrations 

were measured upwind and downwind 

of the Santa Monica Airport and 

compared to modeled air 

concentrations. Modeling results paired 

in both time and space with monitoring 

data showed excellent overall 

agreement. Modeling results show 

aircraft engine run-up is the most 

important source contribution to the 

maximum lead concentration. 

Sensitivity analysis shows that engine 

run-up time, lead concentration in 

aviation gasoline, and the fraction of 

piston engine aircraft that are twin 

engine are the most important 

parameters in determining near-field 

lead concentrations. Year-long air 

quality modeling for 2008 and 

sensitivity analysis for the maximum 

3-month average concentration period 

suggest the potential for 3-month 

average lead concentrations that exceed 

the current NAAQS for lead (0.15 μg/ 

m3) and help inform the process for 

identifying locations of maximum 

concentration. 

The second study is the final report 

on one of the airport studies referenced 

in the proposed rule. This report 

provides additional information on the 

approach, methods, and results of the 

study. 

III. How can I get a copy of these 

documents and other related 

information? 

1. Docket. EPA has established a 

docket for this action under Docket ID 

No. EPA–HQ–OAR–2006–0735. All 

documents in the docket are listed on 

the http://www.regulations.gov Web 

site. Although listed in the index, some 

information is not publicly available, 

e.g., Confidential Business Information 

(CBI) or other information whose 

disclosure is restricted by statute. 

Certain other material, such as 

copyrighted material, is not placed on 

the Internet and will be publicly 

available only in hard copy form. 

Publicly available docket materials are 

available either electronically through 

http://www.regulations.gov or in hard 

copy at the Revisions to Lead Ambient 

Air Monitoring Requirements docket, 

Docket ID No. EPA–OAR–2006–0735, 

EPA Docket Center, EPA/DC, EPA West, 

Room 3334, 1301 Constitution Ave., 

NW., Washington, DC. This Docket 

Facility is open from 8:30 a.m. to 4:30 

p.m. Monday through Friday excluding 

legal holidays. The docket telephone 

number is (202) 566–1742. The Public 

Reading Room is open from 8:30 a.m. to 

4:30 p.m., Monday through Friday, 

excluding legal holidays. The telephone 

number for the Public Reading Room is 

(202) 566–1744. 

2. Electronic Access. You may access 

this Federal Register document 

electronically through the EPA Internet 

under the ‘‘Federal Register’’ listings at 

http://www.epa.gov/fedrgstr/. 

IV. References 

U.S. EPA (2010) Development and evaluation 

of an air quality modeling approach for 

lead emissions from piston-engine 

aircraft operating on leaded aviation 

gasoline. EPA–420–R–10–007. Available 

at http://www.epa.gov/otaq/ 

aviation.htm. 

South Coast Air Quality Management 

District (2010) General Aviation Airport Air 

Monitoring Study Final Report. Final Report. 

List of Subjects in 40 CFR Part 58 

Ambient air monitoring, Air pollution 

control, Environmental protection, 

Intergovernmental relations, Reporting 

and recordkeeping requirements. 

Dated: December 2, 2010. 

Mary E. Henigin, 

Acting Director, Office of Air Quality Planning 

and Standards. 

[FR Doc. 2010–30849 Filed 12–7–10; 8:45 am] 

BILLING CODE 6560–50–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Parts 85, 86, and 600 

DEPARTMENT OF TRANSPORTATION 

National Highway Traffic Safety 

Administration 

49 CFR Parts 531 and 533 

[EPA–HQ–OAR–2010–0799; FRL–9235–8; 

NHTSA–2010–0131] 

RIN 2060–AQ54; RIN 2127–AK79 

2017 and Later Model Year Light-Duty 

Vehicle GHG Emissions and CAFE 

Standards: Supplemental Notice of 

Intent 

AGENCIES: Environmental Protection 

Agency (EPA) and the National 

Highway Traffic Safety Administration 

(NHTSA), Department of Transportation 

(DOT). 

ACTION: Supplemental Notice of Intent 

to conduct a joint rulemaking. 

SUMMARY: On May 21, 2010, President 

Obama issued a Presidential 

Memorandum requesting that the 

Environmental Protection Agency (EPA) 

and the National Highway Traffic Safety 

Administration (NHTSA), on behalf of 

the Department of Transportation, 

develop, through notice and comment 

rulemaking, a coordinated National 

Program under the Clean Air Act (CAA) 

and the Energy Policy and Conservation 

Act (EPCA), as amended by the Energy 

Independence and Security Act (EISA), 

to improve fuel economy and to reduce 

greenhouse gas emissions of light-duty 

vehicles for model years 2017–2025. 

President Obama requested that the 

agencies issue a Notice of Intent (NOI) 

to issue a proposed rulemaking that 

announces plans for setting stringent 

fuel economy and greenhouse gas 

emissions standards for light-duty 


jlentini on DSKJ8SOYB1PROD with PROPOSALS