Approval and Promulgation of Implementation Plans; Massachusetts

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]

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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....................... 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]

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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....................... 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

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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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