[Federal Register Volume 62, Number 134 (Monday, July 14, 1997)]
[Rules and Regulations]
[Pages 37510-37514]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 97-18408]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[MA-7197a; FRL-5847-1]


Approval and Promulgation of Implementation Plans; Massachusetts

AGENCY: Environmental Protection Agency (EPA).

ACTION: Direct final rule.

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SUMMARY: The EPA today is approving State Implementation Plan (SIP) 
revisions submitted by the Commonwealth of Massachusetts. These 
revisions consist of 1990 base year ozone emission inventories, and 
establishment of a Photochemical Assessment Monitoring System (PAMS) 
network.
    The inventories were submitted by the Commonwealth to satisfy a 
Clean Air Act (CAA) requirement that States containing ozone 
nonattainment areas submit inventories of actual ozone precursor 
emissions in accordance with guidance from the EPA. The ozone emission 
inventories submitted by the Commonwealth are for the Springfield 
serious area, and the Massachusetts portion of the Boston-Lawrence-
Worcester serious area. The PAMS SIP revision was submitted to satisfy 
the requirements of the CAA and the PAMS regulations. The intended 
effect of this action is to approve as a revision to the Massachusetts 
SIP the state's 1990 base year ozone emission inventories, and to 
approve the PAMS network into the State's SIP.

DATES: This action will become effective on September 12, 1997 unless 
notice is received by August 13, 1997 that adverse or critical comments 
will be submitted. If the effective date is delayed, timely notice will 
be published in the Federal Register.

ADDRESSES: Written comments on this action should be addressed to Susan 
Studlien, Deputy Director, Office of Ecosystem Protection, 
Environmental Protection Agency, Region I, JFK Federal Building, 
Boston, Massachusetts, 02203. Copies of the documents relevant to this 
action are available for public inspection during normal business hours 
at the EPA Region I office, and at the Massachusetts Department of 
Environmental Protection, Division of Air Quality Control, One Winter 
Street, 7th Floor, Boston, Massachusetts, 02108-4746. Persons 
interested in examining these documents should make an appointment with 
the appropriate office at least 24 hours before the visiting day.

FOR FURTHER INFORMATION CONTACT: Robert F. McConnell, Air Quality 
Planning Group, EPA Region I, JFK Federal Building, Boston, 
Massachusetts, 02203; telephone (617) 565-9266.

SUPPLEMENTARY INFORMATION: Massachusetts submitted its 1990 base year 
emission inventories of ozone precursors to the EPA on November 13, 
1992. Revisions to the inventories were received on November 15, 1993, 
November 15, 1994, and March 31, 1997. The Commonwealth submitted a SIP 
revision establishing a PAMS network into the State's overall ambient 
air quality monitoring network on November 15, 1993. This document is 
divided into four parts:

I. Background Information
II. Analysis of State Submission
III. Final Action
IV. Administrative Requirements

I. Background Information

1. Emission Inventory:

    Under the CAA as amended in 1990, States have the responsibility to 
inventory emissions contributing to NAAQS nonattainment, to track these 
emissions over time, and to ensure that control strategies are being 
implemented that reduce emissions and move areas towards attainment. 
The CAA requires ozone nonattainment areas designated as moderate, 
serious, severe, and extreme to submit a plan within three years of 
1990 to reduce volatile organic compound (VOC) emissions by 15 percent 
within six years after 1990. The baseline level of emissions, from 
which the 15 percent reduction is calculated, is determined by 
adjusting the base year inventory to exclude biogenic emissions and to 
exclude certain emission reductions not creditable towards the 15 
percent. The 1990 base year emissions inventory is the primary 
inventory from which the periodic inventory, the Reasonable Further 
Progress (RFP) projection inventory, and the modeling inventory are 
derived. Further information on these inventories and their purpose can 
be found in the ``Emission Inventory Requirements for Ozone State 
Implementation Plans,'' U.S. Environmental Protection Agency, Office of 
Air Quality Planning and Standards, Research Triangle Park, North 
Carolina, March 1991. The base year inventory may also serve as part of 
statewide inventories for purposes of regional modeling in transport 
areas. The base year inventory plays an important role in modeling 
demonstrations for areas classified as moderate and above.
    The air quality planning requirements for marginal to extreme ozone 
nonattainment areas are set out in section 182(a)-(e) of title I of the 
CAA. The EPA has issued a General Preamble describing the EPA's 
preliminary views on how the agency intends to review SIP revisions 
submitted under title I of the Act, including requirements for the 
preparation of the 1990 base year inventory [see 57 FR 13502 (April 16, 
1992) and 57 FR 18070 (April 28, 1992)]. In this action EPA will rely 
on the General Preamble's interpretation of the CAA, and the reader 
should refer to the General Preamble for a more detailed discussion of 
the interpretations of title I advanced in today's rule and the 
supporting rationale.
    Those States containing ozone nonattainment areas classified as 
marginal to extreme are required under section 182(a)(1) of the CAA to 
submit a final, comprehensive, accurate, and current inventory of 
actual ozone season, weekday emissions from all sources within 2 years 
of enactment (November 15, 1992). This inventory is for calendar year 
1990 and is denoted as the base year inventory. It includes both 
anthropogenic and biogenic sources of volatile organic compound (VOC), 
nitrogen oxides (NOX), and carbon monoxide (CO). The 
inventory is to address actual VOC, NOX, and CO

[[Page 37511]]

emissions for the area during a peak ozone season, which is generally 
comprised of the summer months. All stationary point and area sources, 
as well as mobile sources within the nonattainment area, are to be 
included in the compilation. Available guidance for preparing emission 
inventories is provided in the General Preamble (57 FR 13498 (April 16, 
1992)).

2. PAMS Network

    On November 15, 1993, the Massachusetts Department of Environmental 
Protection (DEP) submitted to the EPA a SIP revision incorporating PAMS 
into the ambient air quality monitoring network of State or Local Air 
Monitoring Stations (SLAMS) and National Air Monitoring Stations 
(NAMS). The Commonwealth will establish and maintain PAMS as part of 
its overall ambient air quality monitoring network.
    Section 182(c)(1) of the CAA and the General Preamble (57 FR 13515) 
require that the EPA promulgate rules for enhanced monitoring of ozone, 
NOX, and VOCs no later than 18 months after the date of the 
enactment of the Act. These rules will provide a mechanism for 
obtaining more comprehensive and representative data on ozone air 
pollution in areas designated nonattainment and classified as serious, 
severe, or extreme.
    The final PAMS rule was promulgated by the EPA on February 12, 1993 
(58 FR 8452). Section 58.40(a) of the revised rule requires the State 
to submit a PAMS network description, including a schedule for 
implementation, to the Administrator within six months after 
promulgation or by August 12, 1993. Further, Sec. 58.20(f) requires the 
State to provide for the establishment and maintenance of a PAMS 
network within nine months after promulgation of the final rule or by 
November 12, 1993.
    On December 30, 1993, the Massachusetts DEP submitted a PAMS 
network description. The EPA sent the Commonwealth a letter on May 17, 
1994 finding the submittal administratively complete. This submittal 
was reviewed and approved on July 21, 1994 by the EPA and was judged to 
satisfy the requirements of section 58.40(a). Since network 
descriptions may change annually, they are not part of the SIP as 
recommended by the document, ``Guideline for the Implementation of the 
Ambient Air Monitoring Regulations, 40 CFR part 58'' (EPA-450/4-78-038, 
OAQPS, November 1979). However, the network description is negotiated 
and approved during the annual review as required by 40 CFR sections 
58.25 and 58.36, respectively, and any revision must be reviewed as 
provided at 40 CFR section 58.46.
    The Massachusetts PAMS SIP revision is intended to meet the 
requirements of section 182(c)(1) of the Act and to comply with the 
PAMS regulations, codified at 40 CFR part 58. The Massachusetts DEP 
held several public hearings on the PAMS SIP revision during October, 
1993.

II. Analysis of State Submission

1. Emission Inventory

A. Procedural Background
    The Act requires States to observe certain procedural requirements 
in developing emission inventory submissions to the EPA. Section 
110(a)(2) of the Act provides that each emission inventory submitted by 
a State must be adopted after reasonable notice and public 
hearing.1 Final approval of the inventory will not occur 
until the State revises the inventory to address public comments. 
Changes to the inventory that impact the 15 percent reduction 
calculation and require a revised control strategy will constitute a 
SIP revision. EPA created a ``de minimis'' exception to the public 
hearing requirement for minor changes. EPA defines ``de minimis'' for 
such purposes to be those in which the 15 percent reduction calculation 
and the associated control strategy or the maintenance plan showing, do 
not change. States will aggregate all such ``de minimis'' changes 
together when making the determination as to whether the change 
constitutes a SIP revision. The State will need to make the change 
through the formal SIP revision process, in conjunction with the change 
to the control measure or other SIP programs.2 Section 
110(a)(2) of the Act similarly provides that each revision to an 
implementation plan submitted by a State under the Act must be adopted 
by such State after reasonable notice and public hearing.
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    \1\ Also Section 172(c)(7) of the Act requires that plan 
provisions for nonattainment areas meet the applicable provisions of 
section 110(a)(2).
    \2\ Memorandum from John Calcagni, Director, Air Quality 
Management Division, and William G. Laxton, Director, Technical 
Support Division, to Regional Air Division Directors, Region I-X, 
``Public Hearing Requirements for 1990 Base-Year Emission 
Inventories for Ozone and Carbon Monoxide Nonattainment Areas,'' 
September 29, 1992.
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    On November 13, 1992, the Commonwealth of Massachusetts submitted 
to the EPA as a SIP revision the 1990 base year inventories for the two 
serious ozone nonattainment areas. Prior to the Commonwealth's 
submittal of final inventories to the EPA on November 13, 1992, the 
State had submitted draft inventories to EPA on May 1, 1992. EPA 
reviewed the draft inventories and sent comments to the state by letter 
dated September 1, 1992. The revised inventories submitted to EPA on 
November 13, 1992, addressed many of EPA's comments. EPA reviewed the 
November 13, 1992 submittal and provided comments to the State through 
the hearing process by letter dated August 5, 1993. These comments 
included comments developed by an EPA contractor's review of the 
Massachusetts inventories. The contractor's comments are summarized 
within reports dated April 12 and May 25, 1993. Massachusetts submitted 
revisions to its final 1990 base year emission inventories on November 
15, 1993, November 15, 1994, and March 31, 1997. The State held several 
public hearings on the emission inventories, the last of which occurred 
on February 13 and 14, 1997.
    The EPA Region I Office has compared the final Massachusetts 
inventories with the deficiencies noted in the various comment letters 
and concluded that Massachusetts has adequately addressed the issues 
presented in the comment letters.
B. Emission Inventory Review
    Section 110(k) of the CAA sets out provisions governing the EPA's 
review of base year emission inventory submittals in order to determine 
approval or disapproval under section 182(a)(1) (see 57 FR 13565-13566 
(April 16, 1992)). The EPA is approving the Massachusetts ozone base 
year emission inventories submitted to the EPA in final form on 
November 15, 1994, based on the Levels I, II, and III review findings. 
This section outlines the review procedures performed to determine if 
the base year emission inventories are acceptable or should be 
disapproved.
    The Levels I and II review process is used to determine that all 
components of the base year inventory are present. The review also 
evaluates the level of supporting documentation provided by the State 
and assesses whether the emissions were developed according to current 
EPA guidance.
    The Level III review process is outlined here and consists of 10 
points that the inventory must include. For a base year emission 
inventory to be acceptable it must pass all of the following acceptance 
criteria:
    1. An approved Inventory Preparation Plan (IPP) was provided and 
the QA program contained in the IPP was performed and its 
implementation documented.
    2. Adequate documentation was provided that enabled the reviewer to

[[Page 37512]]

determine the emission estimation procedures and the data sources used 
to develop the inventory.
    3. The point source inventory must be complete.
    4. Point source emissions must have been prepared or calculated 
according to the current EPA guidance.
    5. The area source inventory must be complete.
    6. The area source emissions must have been prepared or calculated 
according to the current EPA guidance.
    7. Biogenic emissions must have been prepared according to current 
EPA guidance or another approved technique.
    8. The method (e.g., Highway Performance Modeling System or a 
network transportation planning model) used to develop vehicle miles 
travelled (VMT) estimates must follow EPA guidance, which is detailed 
in the document, ``Procedures for Emission Inventory Preparation, 
Volume IV: Mobile Sources,'' U.S. Environmental Protection Agency, 
Office of Mobile Sources and Office of Air Quality Planning and 
Standards, Ann Arbor, Michigan, and Research Triangle Park, North 
Carolina, December 1992.
    9. The MOBILE model (or EMFAC model for California only) was 
correctly used to produce emission factors for each of the vehicle 
classes.
    10. Non-road mobile emissions were prepared according to current 
EPA guidance for all of the source categories.
    The base year emission inventory will be approved if it passes 
Levels I, II, and III of the review process. Detailed Level I and II 
review procedures can be found in ``Quality Review Guidelines for 1990 
Base Year Emission Inventories,'' U.S. Environmental Protection Agency, 
Office of Air Quality Planning and Standards, Research Triangle Park, 
NC, July 27, 1992. Level III review procedures are specified in EPA 
memoranda noted in the margin.3
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    \3\ Memorandum from J. David Mobley, Chief, Emissions Inventory 
Branch, to Air Branch Chiefs, Region I-X, ``Final Emission Inventory 
Level III Acceptance Criteria,'' October 7, 1992; and memorandum 
from John S. Seitz, Director, Office of Air Quality Planning and 
Standards, to Regional Air Division Directors, Region I-X, 
``Emission Inventory Issues,'' June 24, 1993.
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    The emission inventories prepared by Massachusetts for its two, 
serious ozone nonattainment areas meet each of Level III's ten 
criteria. Documentation of the EPA's evaluation, including details of 
the review procedure, is contained within the technical support 
document prepared for the Massachusetts 1990 base year inventory, which 
is available to the public as part of the docket supporting this 
action.

2. PAMS Network

    The Massachusetts PAMS SIP revision will provide the Commonwealth 
with the authority to establish and operate the PAMS sites, will secure 
State funds for PAMS, and will provide the EPA with the authority to 
enforce the implementation of PAMS, since its implementation is 
required by the Act.
    The criteria used to review the proposed SIP revision are derived 
from the PAMS regulations, codified at 40 CFR Part 58, and are included 
in ``Guideline for the Implementation of the Ambient Air Monitoring 
Regulations, 40 CFR part 58'' (EPA-450/4-78-038, Office of Air Quality 
Planning and Standards, November 1979), the September 2, 1993, 
memorandum from G. T. Helms entitled, ``Final Boilerplate Language for 
the PAMS SIP Submittal,'' the CAA, and the General Preamble.
    The September 2, 1993, Helms memorandum stipulates that the PAMS 
SIP, at a minimum, must:
    1. Provide for monitoring of criteria pollutants, such as ozone and 
nitrogen dioxide and non-criteria pollutants, such as nitrogen oxides, 
speciated VOCs, including carbonyls, as well as meteorological 
parameters;
    2. Provide a copy of the approved (or proposed) PAMS network 
description, including the phase-in schedule, for public inspection 
during the public notice and/or comment period provided for in the SIP 
revision or, alternatively, provide information to the public upon 
request concerning the State's plans for implementing the rules;
    3. Make reference to the fact that PAMS will become a part of the 
State or local air monitoring stations (SLAMS) network;
    4. Provide a statement that SLAMS will employ Federal reference 
methods (FRM) or equivalent methods while most PAMS sampling will be 
conducted using methods approved by the EPA.
    The Massachusetts PAMS SIP revision provides that the Commonwealth 
will implement PAMS as required in 40 CFR part 58, as amended February 
12, 1993. The State will amend its SLAMS and its NAMS monitoring 
systems to include the PAMS requirements. It will develop its PAMS 
network design and establish monitoring sites pursuant to 40 CFR part 
58 in accordance with an approved network description and as negotiated 
with the EPA through the 105 grant process on an annual basis. The 
Commonwealth has begun implementing its PAMS network as required in 40 
CFR part 58.
    The Massachusetts PAMS SIP revision also includes a provision to 
meet quality assurance requirements as contained in 40 CFR part 58, 
Appendix A. The Commonwealth's SIP revision also assures EPA that the 
State's PAMS monitors will meet monitoring methodology requirements 
contained in 40 CFR part 58, Appendix C. Lastly, the Commonwealth's SIP 
revision requires that the Massachusetts PAMS network will be phased in 
over a period of five years as required in 40 CFR section 58.44. The 
State's PAMS SIP submittal and the EPA's technical support document are 
available for viewing at the EPA Region I Office as outlined under the 
``Addresses'' section of this Federal Register document. The 
Commonwealth's PAMS SIP submittal is also available for viewing at the 
Massachusetts State Office as outlined under the ``Addresses'' section 
of this Federal Register document.

III. Final Action

1. Emission Inventory

    Massachusetts has submitted complete inventories containing point, 
area, biogenic, on-road mobile, and non-road mobile source data, and 
accompanying documentation. Emissions from these sources are presented 
in the following table:

                                                     VOC \4\                                                    
                                   [Ozone Seasonal Emissions in Tons Per Day]                                   
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                                                    Point       On-road      Non-road                           
                NAA                 Area source     source       mobile       mobile      Biogenic      Total   
                                     emissions    emissions    emissions    emissions                 emissions 
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Springfield.......................        52.64        13.71        62.24        29.59       277.22       435.40

[[Page 37513]]

                                                                                                                
Bos-Law-Wor.......................       313.42        50.57       286.54       177.46       374.02     1202.01 
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\4\ Note that these VOC inventory numbers include emissions of perchloroethylene and acetone. EPA has determined
  that these VOCs are photochemically non-reactive and do not significantly contribute to ozone production.     
  Therefore, these inventory numbers have been adjusted to remove emissions of these VOCs in the proposed       
  conditional interim approval of Massachusetts' 15 percent plan published elsewhere in today's Federal         
  Register.                                                                                                     


                                                       NOX                                                      
                                   [Ozone Seasonal Emissions in Tons Per Day]                                   
----------------------------------------------------------------------------------------------------------------
                                                    Point       On-road      Non-road                           
                NAA                 Area source     source       mobile       mobile      Biogenic      Total   
                                     emissions    emissions    emissions    emissions                 emissions 
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Springfield.......................         4.40        19.29        74.48        19.90           NA       118.07
Bos-Law-Wor.......................        28.09       298.77       332.30       156.28           NA       815.44
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                                                       CO                                                       
                                   [Ozone Seasonal Emissions in Tons Per Day]                                   
----------------------------------------------------------------------------------------------------------------
                                                    Point       On-road      Non-road                           
                NAA                 Area source     source       mobile       mobile      Biogenic      Total   
                                     emissions    emissions    emissions    emissions                 emissions 
----------------------------------------------------------------------------------------------------------------
Springfield.......................         7.93         6.70       484.31       178.22           NA       677.16
Bos-Law-Wor.......................        45.51        33.62      2064.06      1176.46           NA      3319.65
----------------------------------------------------------------------------------------------------------------

    Massachusetts has satisfied all of the EPA's requirements for 
providing a comprehensive, accurate, and current inventory of actual 
ozone precursor emissions in the Springfield and Boston-Lawrence-
Worcester serious ozone nonattainment areas. The inventories are 
complete and approvable according to the criteria set out in the 
November 12, 1992 memorandum from J. David Mobley, Chief Emission 
Inventory Branch, TSD to G. T. Helms, Chief Ozone/Carbon Monoxide 
Programs Branch, AQMD. In today's final action, the EPA is approving 
the SIP 1990 base year ozone emission inventories submitted by the 
Commonwealth for the Springfield area and the Massachusetts portion of 
the Boston-Lawrence-Worcester nonattainment area as meeting the 
requirements of section 182(a)(1) of the CAA.

2. PAMS Network

    In today's action, the EPA is fully approving the revision to the 
Massachusetts ozone SIP for PAMS.
    The EPA is publishing these actions without prior proposal because 
the Agency views them as noncontroversial amendments and anticipates no 
adverse comments. However, in a separate document in this Federal 
Register publication, the EPA is proposing to approve these SIP 
revisions and is soliciting public comment on them. This action will be 
effective September 12, 1997 unless, by August 13, 1997, adverse or 
critical comments are received.
    If the EPA receives such comments, this action will be withdrawn 
before the effective date by publishing a subsequent document that will 
withdraw the final actions. All public comments received will be 
addressed in a subsequent final rule based on this action serving as a 
proposed rule. The EPA will not institute a second comment period on 
this action. Any parties interested in commenting on this action should 
do so at this time. If no such comments are received, the public is 
advised that this action will be effective Septermber 12, 1997.
    Nothing in this action should be construed as permitting or 
allowing or establishing a precedent for any future request for 
revision to any SIP. Each request for revision to the SIP shall be 
considered separately in light of specific technical, economic, and 
environmental factors and in relation to relevant statutory and 
regulatory requirements.

IV. Administrative Requirements

A. Executive Order 12866

    This action has been classified as a Table 3 action for signature 
by the Regional Administrator under the procedures published in the 
Federal Register on January 19, 1989 (54 FR 2214-2225), as revised by a 
July 10, 1995 memorandum from Mary Nichols, Assistant Administrator for 
Air and Radiation. The Office of Management and Budget (OMB) has 
exempted this regulatory action from E.O. 12866 review.

B. Regulatory Flexibility Act

    Under the Regulatory Flexibility Act, 5 U.S.C. 600 et. seq., EPA 
must prepare a regulatory flexibility analysis assessing the impact of 
any proposed or final rule on small entities. 5 U.S.C. 603 and 604. 
Alternatively, EPA may certify that the rule will not have a 
significant impact on a substantial number of small entities. Small 
entities include small businesses, small not-for-profit enterprises, 
and government entities with jurisdiction over populations of less than 
50,000.
    SIP approvals under section 110 and subchapter I, part D of the 
Clean Air Act do not create any new requirements but simply approve 
requirements that the State is already imposing. Therefore, because the 
Federal SIP approval does not impose any new requirements, the 
Administrator certifies that it does not have a significant impact on 
any small entities affected. Moreover, due to the

[[Page 37514]]

nature of the Federal-State relationship under the CAA, preparation of 
a flexibility analysis would constitute Federal inquiry into the 
economic reasonableness of state action. The Clean Air Act forbids EPA 
to base its actions concerning SIPs on such grounds. Union Electric Co. 
v. U.S. EPA, 427 U.S. 246, 255-66 (1976); 42 U.S.C. 7410(a)(2).

C. Unfunded Mandates

    Under Sections 202 of the Unfunded Mandates Reform Act of 1995 
(``Unfunded Mandates Act''), signed into law on March 22, 1995, EPA 
must prepare a budgetary impact statement to accompany any proposed or 
final rule that includes a Federal mandate that may result in estimated 
costs to State, local, or tribal governments in the aggregate; or to 
the private sector, of $100 million or more. Under Section 205, EPA 
must select the most cost-effective and least burdensome alternative 
that achieves the objectives of the rule and is consistent with 
statutory requirements. Section 203 requires EPA to establish a plan 
for informing and advising any small governments that may be 
significantly or uniquely impacted by the rule.
    EPA has determined that the approval action promulgated does not 
include a Federal mandate that may result in estimated costs of $100 
million or more to either State, local, or tribal governments in the 
aggregate, or to the private sector. This Federal action approves pre-
existing requirements under State or local law, and imposes no new 
requirements. Accordingly, no additional costs to State, local, or 
tribal governments, or to the private sector, result from this action.

D. Submission to Congress and the General Accounting Office

    Under 5 U.S.C. 801(a)(1)(A) as added by the Small Business 
Regulatory Enforcement Fairness Act of 1996, EPA submitted a report 
containing this rule and other required information to the U.S. Senate, 
the U.S. House of Representatives and the Comptroller General of the 
General Accounting Office prior to publication of the rule in today's 
Federal Register. This rule is not a ``major rule'' as defined by 5 
U.S.C. 804(2).

E. Petitions for Judicial Review

    Under section 307(b)(1) of the Clean Air Act, petitions for 
judicial review of this action must be filed in the United States Court 
of Appeals for the appropriate circuit by September 12, 1997. Filing a 
petition for reconsideration by the Administrator of this final rule 
does not affect the finality of this rule for the purposes of judicial 
review nor does it extend the time within which a petition for judicial 
review may be filed, and shall not postpone the effectiveness of such 
rule or action. This action may not be challenged later in proceedings 
to enforce its requirements. (See section 307(b)(2).) EPA encourages 
interested parties to comment in response to the proposed rule rather 
than petition for judicial review, unless the objection arises after 
the comment period allowed for in the proposal.

List of Subjects in 40 CFR Part 52

    Environmental protection, Air pollution control, Carbon monoxide, 
Hydrocarbons, Incorporation by reference, Nitrogen dioxide, Ozone, 
Reporting and recordkeeping requirements.

    Note: Incorporation by reference of the State Implementation 
Plan for the State of Massachusetts was approved by the Director of 
the Federal Register on July 1, 1982.

    Dated: June 13, 1997.
John P. DeVillars,
Regional Administrator, Region I.
    40 CFR part 52 is amended as follows:

PART 52--[AMENDED]

    1. The authority citation for part 52 continues to read as follows:

    Authority: 42 U.S.C. 7401-7641q.

Subpart W--Massachusetts

    2. Section 52.1120 is amended by adding paragraph (c)(113) to read 
as follows:


Sec. 52.1120  Identification of plan.

* * * * *
    (c) * * *
    (113) A revision to the Massachusetts SIP regarding ozone 
monitoring. The Commonwealth of Massachusetts will modify its SLAMS and 
its NAMS monitoring systems to include a PAMS network design and 
establish monitoring sites. The Commonwealth's SIP revision satisfies 
40 CFR 58.20(f) PAMS requirements.
    (i) Incorporation by reference.
    (A) Massachusetts PAMS Network Plan, which incorporates PAMS into 
the ambient air quality monitoring network of State or Local Air 
Monitoring Stations (SLAMS) and National Air Monitoring Stations 
(NAMS).
    (ii) Additional material.
    (A) Letter from the Massachusetts Department of Environmental 
Protection dated December 30, 1993 submitting a revision to the 
Massachusetts State Implementation Plan.
    3. Section 52.1125 is added to read as follows:


Sec. 52.1125  Emission inventories.

    (a) The Governor's designee for the Commonwealth of Massachusetts 
submitted the 1990 base year emission inventories for the Springfield 
nonattainment area and the Massachusetts portion of the Boston-
Lawrence-Worcester ozone nonattainment area on November 13, 1992 as a 
revision to the State Implementation Plan (SIP). Revisions to the 
inventories were submitted on November 15, 1993, and November 15, 1994, 
and March 31, 1997. The 1990 base year emission inventory requirement 
of section 182(a)(1) of the Clean Air Act, as amended in 1990, has been 
satisfied for these areas.
    (b) The inventories are for the ozone precursors which are volatile 
organic compounds, nitrogen oxides, and carbon monoxide. The 
inventories covers point, area, non-road mobile, on-road mobile, and 
biogenic sources.
    (c) Taken together, the Springfield nonattainment area and the 
Massachusetts portion of the Boston-Lawrence-Worcester nonattainment 
area encompass the entire geographic area of the State. Both areas are 
classified as serious ozone nonattainment areas.

[FR Doc. 97-18408 Filed 7-11-97; 8:45 am]
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