[Federal Register Volume 73, Number 94 (Wednesday, May 14, 2008)]
[Proposed Rules]
[Pages 27786-27788]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E8-10813]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[EPA-R03-OAR-2008-0181; FRL-8565-6]


Approval and Promulgation of Air Quality Implementation Plans; 
Pennsylvania; Section 110(a)(1) 8-Hour Ozone Maintenance Plan and 2002 
Base-Year Inventory for the Somerset County Area

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

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SUMMARY: EPA is proposing to approve a State Implementation Plan (SIP) 
revision submitted by the Commonwealth of Pennsylvania. The 
Pennsylvania Department of Environmental Protection (PADEP) submitted a 
SIP revision consisting of a maintenance plan that provides for 
continued attainment of the 8-hour ozone national ambient air quality 
standard (NAAQS) for at least 10 years after the April 30, 2004 
designations, as well as a 2002 base-year inventory for the Somerset 
County Area. EPA is proposing approval of the maintenance plan and the 
2002 base-year inventory in accordance with the requirements of the 
Clean Air Act (CAA).

DATES: Written comments must be received on or before June 13, 2008.

ADDRESSES: Submit your comments, identified by Docket ID Number EPA-
R03-OAR-2008-0181 by one of the following methods:
    A. http://www.regulations.gov. Follow the on-line instructions for 
submitting comments.
    B. E-mail: [email protected].
    C. Mail: EPA-R03-OAR-2008-0181, Cristina Fernandez, Chief, Air 
Quality Planning Branch, Mailcode 3AP21, U.S. Environmental Protection 
Agency, Region III, 1650 Arch Street, Philadelphia, Pennsylvania 19103.
    D. Hand Delivery: At the previously-listed EPA Region III address. 
Such deliveries are only accepted during the Docket's normal hours of 
operation, and special arrangements should be made for deliveries of 
boxed information.
    Instructions: Direct your comments to Docket ID No. EPA-R03-OAR-
2008-0181. EPA's policy is that all comments received will be included 
in the public docket without change, and may be made available online 
at http://www.regulations.gov, including any personal information 
provided, unless the comment includes information claimed to be 
Confidential Business Information (CBI) or other information whose 
disclosure is restricted by statute. Do not submit information that you 
consider to be CBI or otherwise protected through http://www.regulations.gov or e-mail. The http://www.regulations.gov Web site 
is an ``anonymous access'' system, which means EPA will not know your 
identity or contact information unless you provide it in the body of 
your comment. If you send an e-mail comment directly to EPA without 
going through http://www.regulations.gov, your e-mail address will be 
automatically captured and included as part of the comment that is 
placed in the public docket and made available on the Internet. If you 
submit an electronic comment, EPA recommends that you include your name 
and other contact information in the body of your comment and with any 
disk or CD-ROM you submit. If EPA cannot read your comment due to 
technical difficulties and cannot contact you for clarification, EPA 
may not be able to consider your comment. Electronic files should avoid 
the use of special characters, any form of encryption, and be free of 
any defects or viruses.
    Docket: All documents in the electronic docket are listed in the 
http://www.regulations.gov index. Although listed in the index, some 
information is not publicly available, i.e., 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 in http://www.regulations.gov or in hard copy during normal business hours at the 
Air Protection Division, U.S. Environmental Protection Agency, Region 
III, 1650 Arch Street, Philadelphia, Pennsylvania 19103. Copies of the 
State submittal are available at Pennsylvania Department of 
Environmental Protection, Bureau of Air Quality Control, P.O. Box 8468, 
400 Market Street, Harrisburg, Pennsylvania 17105.

FOR FURTHER INFORMATION CONTACT: Gregory Becoat, (215) 814-2036, or by 
e-mail at [email protected].

SUPPLEMENTARY INFORMATION: On December 17, 2007, PADEP formally

[[Page 27787]]

submitted for approval, under section 110(a)(1) of the CAA, a SIP 
revision for the 8-hour ozone maintenance plan and the 2002 base-year 
inventory for the Somerset County Area.

I. Background

    Section 110(a)(1) of the CAA requires that states submit to EPA 
plans to maintain the NAAQS promulgated by EPA. EPA interprets this 
provision to require that areas that were maintenance areas for the 1-
hour ozone NAAQS, but attainment for the 8-hour ozone NAAQS, submit a 
plan to demonstrate the continued maintenance of the 8-hour ozone 
NAAQS.
    On May 20, 2005, EPA issued guidance that applies to areas that are 
designated unclassifiable/attainment for the 8-hour ozone standard. The 
purpose of this guidance is to address the maintenance requirements in 
section 110(a)(1) of the CAA, and to assist the states in the 
development of a SIP. The components from EPA's guidance include: (1) 
An attainment emissions inventory, which is based on actual ``typical 
summer day'' emissions of volatile organic compounds (VOCs) and 
nitrogen oxides (NOX) for a 10-year maintenance period, from 
a base-year chosen by the state; (2) a maintenance demonstration, which 
demonstrates how the area will remain in compliance with the 8-hour 
ozone standard for a period of 10 years following the effective date of 
designation unclassifiable/attainment (June 15, 2004); (3) an ambient 
air monitoring network, which will be in continuous operation in 
accordance with 40 CFR Part 58 to verify maintenance of the 8-hour 
ozone standard; (4) a contingency plan, that will ensure that in the 
event of a violation of the 8-hour ozone NAAQS, measures will be 
implemented as promptly as possible; (5) a verification of continued 
attainment, indicating how the state intends on tracking the progress 
of the maintenance plan.

II. Summary of SIP Revision

    The Commonwealth of Pennsylvania has requested approval of its 8-
hour ozone maintenance plan and 2002 base-year inventory for the 
Somerset County Area. The PADEP 8-hour ozone maintenance plan addresses 
the five components of EPA's May 20, 2005 guidance, which pertains to 
the maintenance requirements in section 110(a)(1) of the CAA.
    Attainment Emission Inventory: An attainment emissions inventory 
includes emissions during the time period associated with the 
monitoring data showing attainment. PADEP has provided an emissions 
inventory for VOCs and NOX, using 2002 as the base-year from 
which to project emissions. The 2002 inventory is consistent with EPA 
guidance, is based on actual ``typical summer day'' emissions of VOCs 
and NOX, and consists of a list of sources and their 
associated emissions. PADEP prepared comprehensive VOCs and 
NOX emissions inventories for the Somerset County Area. In 
the maintenance plan, PADEP included information on the man-made 
sources of ozone precursors, VOCs and NOX (e.g., 
``stationary sources,'' ``stationary area sources,'' ``highway 
vehicles,'' and ``nonroad sources'').
    Pennsylvania projected emissions for beyond 10 years from the 
effective date of the April 30, 2004 designations for the 8-hour ozone 
standard. PADEP has developed an emissions inventory for ozone 
precursors for the year 2002, 2009, and 2018. Tables 1 and 2 show the 
VOCs and NOX emissions reduction summary for 2002, 2009, and 
2018.

          Table 1.--VOC Emissions Summary: 2002, 2009 and 2018
                          [Tons per summer day]
------------------------------------------------------------------------
      Major source category            2002         2009         2018
------------------------------------------------------------------------
Stationary Point Sources.........         0.21         0.18         0.24
Stationary Area Sources..........         5.63         5.09         5.24
Highway Vehicles.................         6.10         3.11         1.81
Nonroad Sources..................         3.05         3.04         2.29
                                  --------------------------------------
    Total........................        14.99        11.42         9.58
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          Table 2.--NOX Emissions Summary: 2002, 2009 and 2018
                          [Tons per summer day]
------------------------------------------------------------------------
      Major source category            2002         2009         2018
------------------------------------------------------------------------
Stationary Point Sources.........         0.62         0.66         0.74
Stationary Area Sources..........         0.54         0.57         0.57
Highway Vehicles.................        15.44         8.15         3.14
Nonroad Sources..................         5.39         4.22         3.25
                                  --------------------------------------
    Total........................        21.99        13.60         7.70
------------------------------------------------------------------------

    EPA believes Pennsylvania has demonstrated that the VOCs and 
NOX emissions in the Somerset County Area will improve due 
to permanent and enforceable reductions in emissions resulting from 
implementation of the SIP, federal measures, and other state-adopted 
measures.
    Maintenance demonstration: As Table 1 and 2 indicate, the Somerset 
County Attainment Area plan shows maintenance of the 8-hour ozone NAAQS 
by demonstrating that future emissions of VOCs and NOX 
remain at or below the 2002 base-year emissions levels through the year 
2018.
    Based upon the comparison of the projected emissions and the 2002 
base-year inventory emissions, along federal and state measures, EPA 
concludes that PADEP successfully demonstrates that the 8-hour ozone 
standard will be maintained in the Somerset County Area. Further 
details of Somerset County Attainment Area's 8-hour ozone maintenance 
demonstration can be found in a Technical Support Document (TSD) 
prepared for this rulemaking.
    Ambient Air Quality Monitoring: With regard to the ambient air 
monitoring component of the maintenance plan, Pennsylvania commits to 
continue operating its current air quality

[[Page 27788]]

monitoring stations in accordance with 40 CFR part 58, to verify the 
attainment status of the area, with no reductions in the number of 
sites from those in the existing network unless pre-approved by EPA.
    Contingency Plan: Section 110(a)(1) of the CAA requires that the 
state develop a contingency plan which will ensure that any violation 
of a NAAQS is promptly corrected. The purpose of the contingency plan 
is to adopt measures, outlined in the maintenance plan, in order to 
assure continued attainment in the event of a violation of the 8-hour 
ozone NAAQS. The maintenance plan should identify the events that would 
``trigger'' the adoption and implementation of a contingency 
measure(s), the contingency measure(s) that would be adopted and 
implemented, and the schedule indicating the time frame by which the 
state would adopt and implement the measure(s).
    Since the Somerset County Area does not have a monitor, contingency 
measures will be considered if for two consecutive years the fourth 
highest 8-hour ozone concentrations at the design monitor for the 
Cambria County Area are above 84 parts per billion (ppb). If this 
trigger point occurs, PADEP will evaluate whether additional local 
emission control measures should be implemented in Somerset County in 
order to prevent a violation of the air quality standard. PADEP will 
analyze the conditions leading to the excessive ozone levels and 
evaluate what measures might be most effective in correcting the 
excessive ozone levels. PADEP will also analyze the potential emissions 
effect of federal, state, and local measures that have been adopted but 
not yet implemented at the time the excessive ozone levels occurred. 
PADEP will then begin the process of implementing the contingency 
measures outlined in their maintenance plan.
    Verification of continued attainment: PADEP will track the 
attainment status of the 8-hour ozone NAAQS for Somerset County by 
reviewing air quality at the design monitor for the Cambria County Area 
and emissions data during the maintenance period. An annual evaluation 
of vehicle miles traveled and emissions reported from stationary 
sources will be performed and compared to the assumptions about the 
factors used in the maintenance plan. PADEP will also evaluate the 
periodic (every three years) emission inventories prepared under EPA's 
Consolidated Emission Reporting Regulation (40 CFR part 51, subpart A) 
for any unanticipated increases. Based on these evaluations, PADEP will 
consider whether any further emission control measures should be 
implemented.

III. Proposed Action

    EPA is proposing to approve the maintenance plan and the 2002 base-
year inventory for the Somerset County Area, submitted on December 17, 
2007, as revisions to the Pennsylvania SIP. EPA is proposing to approve 
the maintenance plan and 2002 base-year inventory for the Somerset 
County Area because it meets the requirements of section 110(a)(1) of 
the CAA. EPA is soliciting public comments on the issues discussed in 
this document. These comments will be considered before taking final 
action.

IV. Statutory and Executive Order Reviews

    Under the CAA, the Administrator is required to approve a SIP 
submission that complies with the provisions of the Act and applicable 
Federal regulations. 42 U.S.C. 7410(k); 40 CFR 52.02(a). Thus, in 
reviewing SIP submissions, EPA's role is to approve state choices, 
provided that they meet the criteria of the CAA. Accordingly, this 
action merely proposes to approve state law as meeting Federal 
requirements and does not impose additional requirements beyond those 
imposed by state law. For that reason, this proposed action:
     Is not a ``significant regulatory action'' subject to 
review by the Office of Management and Budget under Executive Order 
12866 (58 FR 51735, October 4, 1993);
     Does not impose an information collection 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 proposed rule to approve the maintenance plan and 
the 2002 base-year inventory for the Somerset County Area in the 
Commonwealth of Pennsylvania 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, Nitrogen dioxide, 
Ozone, Reporting and recordkeeping requirements, Volatile organic 
compounds.

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

    Dated: May 1, 2008.
Donald S. Welsh,
Regional Administrator, Region III. 2 3 11
[FR Doc. E8-10813 Filed 5-13-08; 8:45 am]
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