Approval and Promulgation of Air Quality Implementation Plans Maine; Redesignation to Attainment and PMINF10 Contingency Measures for Presque Isle

ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 52 and 81

[ME-19-1-6668a; A-1-FRL-5273-5]

Approval and Promulgation of Air Quality Implementation Plans--

Maine; Redesignation to Attainment and PM10 Contingency Measures

for Presque Isle

AGENCY: Environmental Protection Agency (EPA).

ACTION: Direct final rule.

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SUMMARY: EPA is fully approving Maine's request to redesignate the

Presque Isle area to attainment for particulate matter with an

aerodynamic diameter less than or equal to a nominal 10 micrometers

(PM10), along a maintenance demonstration and contingency plans

which outline Maine's control strategy for maintenance of the PM10

national ambient air quality standards (NAAQS). EPA is also approving a

State Implementation Plan (SIP) revision submitted by the State of

Maine to satisfy federal requirements for contingency measures for the

Presque Isle initial nonattainment area. This action is being taken

under the Clean Air Act.

DATES: This final rule is effective October 30, 1995, unless notice is

received by September 29, 1995 that adverse or critical comments will

be submitted. If the effective date is delayed, timely notice will be

published in the Federal Register.

ADDRESSES: Comments may be mailed to Susan Studlien, Acting Director,

Air, Pesticides and Toxics Management Division, EPA-New England, JFK

Federal Building (AAA), Boston, MA 02203-2211. Copies of the documents

relevant to this action are available for public inspection by

appointment during normal business hours at the Air, Pesticides and

Toxics Management Division, EPA-New England, One Congress Street, 10th

floor, Boston, MA; Air and Radiation Docket and Information Center, US

Environmental Protection Agency, 401 M Street, SW (LE-131), Washington,

DC 20460; and the Bureau of Air Quality Control, Department of

Environmental Protection, 71 Hospital Street, Augusta, ME 04333.

FOR FURTHER INFORMATION CONTACT: Matthew B. Cairns, (617) 565-4982.

SUPPLEMENTARY INFORMATION:

Background

Part D, Subparts 1 and 4 of Title I of the Clean Air Act Amendments

of 1990 (hereafter referred to as ``the Act'') set out air quality

planning requirements for moderate PM10 nonattainment areas. The

EPA has issued a ``General Preamble'' describing EPA's preliminary

views on how EPA intends to review SIPs and SIP revisions submitted

under Title I of the Act, including those State submittals containing

moderate PM10 nonattainment area SIP requirements. [See,

generally, 57 FR 13498 (April 16, 1992) and 57 FR 18070 (April 28,

1992).] Because EPA is describing its interpretations here only in

broad terms, the reader should refer to the General Preamble for a more

detailed discussion of the interpretations of Title I advanced in this

approval and the supporting rationale.

By November 15, 1991, States containing initial moderate PM10

nonattainment areas were required to submit most elements of their

PM10 SIP. [See Secs. 172(c), 188, and 189 of the Act.] Some

provisions were due at a later date. For example, such States also must

submit contingency measures by November 15, 1993, which become

effective without further action by the State or EPA upon a

determination by EPA that the area has failed to achieve RFP or to

attain the PM10 NAAQS by the applicable statutory deadline. [See

Sec. 172(c)(9) and 57 FR 13543-44.]

In order for an area to be redesignated as attainment, the State

must meet the following conditions listed in Sec. 107(d)(3)(E) of the

Act:

(i) The EPA has determined that the NAAQS have been attained.

(ii) The applicable implementation plan has been fully approved

by EPA under Sec. 110(k).

(iii) The EPA has determined that the improvement in air quality

is due to permanent and enforceable reductions in emissions.

(iv) The State has met all applicable requirements for the area

under Sec. 110(k) and Part D.

(v) The EPA has fully approved a maintenance plan, including a

contingency plan, for the area under Sec. 175A.

EPA guidance titled ``Procedures for Processing Requests to

Redesignate Areas to Attainment'' (September 4, 1992 memorandum from

AQMD Director John Calcagni) outlines how to assess the adequacy of

redesignation requests against the conditions listed above.

Summary of Maine's SIP Revision and Redesignation Request for

Presque Isle

On January 12, 1995, EPA approved Maine's PM10 Attainment Plan

(60 FR 2885) for Presque Isle. However, on January 26, 1994, EPA had

notified Maine of ``a finding of failure to submit'' contingency

measures for PM10, which were due by November 15, 1993. According

to EPA guidance titled ``Contingency Measure Due Date for Initial

PM10 Moderate Nonattainment Areas'' (February 25, 1992 memo from

Calcagni), states were not obligated to submit contingency measures

until EPA established a due date for their submittal. On April 16, 1992

EPA gave States until November 15, 1993 to submit required contingency

measures. (See General Preamble at 57 FR 13543 footnote 26.) Although

the due date for contingency measures had passed by the

[[Page 45057]]

time EPA proposed approval of Maine's PM10 Attainment Plan, EPA

fully approved of this SIP revision because it meets all requirements

applicable as of the time of its adoption by Maine and submittal to

EPA. Furthermore, full approval did not relieve Maine from the

obligation to submit a separate SIP revision to meet contingency

measure requirements. (See 59 FR 24096 (May 10, 1994).)

On June 1, 1994, the Maine Department of Environmental Protection

(Maine DEP) submitted a SIP revision for Chapter 114 ``Classification

of Air Quality Control Regions'' and a request to redesignate the

Presque Isle area to attainment for PM10, accompanied by

contingency and maintenance plans. On July 22, 1994, EPA-New England

determined this submittal was complete and acceptable for processing.

The completeness determination stopped the associated sanctions clock

for failure to submit contingency measures. EPA also noted that Maine's

contingency plan could satisfy both the contingency measure requirement

for initial moderate PM10 nonattainment areas under Sec. 172(c)(9)

and the contingency provisions required for redesignation under

Sec. 175A(d).

Section 110(k) of the Act sets out provisions governing EPA's

review of SIP submittals. (See 57 FR 13565-66.) Specific requirements

and the rationale for EPA's approval action are detailed in the

Technical Support Document (TSD), dated May 18, 1995, and are

summarized, but not restated, here in the following paragraphs.

Interested parties should consult the TSD or Maine's submittal for

details.

Procedural Background

The Act requires States to observe certain procedural requirements

in developing implementation plans and plan revisions for submission to

EPA. Section 110(a)(2) of the Act provides that each implementation

plan submitted by a State must be adopted after reasonable notice and

public hearing. Section 110(l) 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. Section 172(c) of the Act also requires that plan provisions

for nonattainment areas meet the applicable provisions of

Sec. 110(a)(2).

EPA must also determine whether a submittal is complete and

therefore warrants further EPA review and action. [See Sec. 110(k)(1)

and 57 FR 13565.] EPA's completeness criteria for SIP submittals are

set out at 40 CFR Part 51, Appendix V (1991), as amended by 57 FR 42216

(August 26, 1991).1 EPA attempts to make completeness

determinations within 60 days of receiving a submittal. However, a

submittal is deemed complete by operation of law if EPA does not make a

completeness determination by 6 months after receipt of the submittal.

\1\ Since redesignations are subject to Sec. 107(d)(3)(D) rather

than Sec. 110(k), EPA is not required to promulgate completeness

criteria or make completeness determinations on redesignations.

However, under its general rulemaking authority of Sec. 301(a) of

the Act as necessary to implement the requirements of

Sec. 107(d)(3)(D), EPA has determined it is appropriate to apply the

completeness criteria applicable to Sec. 110(k) actions to

redesignations. (See 56 FR 42216-7, August 26, 1991.)

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The State of Maine held a public hearing on March 24, 1994 to

entertain public comment on the redesignation request and contingency

measures for Presque Isle. EPA reviewed Maine's submittal to determine

completeness in accordance with criteria outlined in 40 CFR Part 51

Appendix V and as amended by 57 FR 42216 (August 26, 1991). As noted

above, EPA-New England informed the Director of Maine DEP's Bureau of

Air Quality (the Maine Governor's designee) that the submittal was

complete and explained how the review process would proceed.

Redesignation to Attainment

In the TSD prepared for approval of Maine's PM10 Attainment

Plan (January 2, 1994 memorandum from Brian Hennessy), EPA noted that

the NAAQS have been attained and that the improvement in air quality is

due to permanent and enforceable reductions in emissions [requirements

(i) and (iii) above] had already been met for purposes of redesignating

Presque Isle to attainment. With the following explanations, Maine's

redesignation request has satisfied the remainder of EPA's guidance

concerning redesignation to attainment.

Maintenance Plan and Contingency Provisions Under Section175A

Section 175A defines the general frame work of a maintenance plan.

The maintenance plan will constitute a SIP revision and must provide

for maintenance of the relevant NAAQS in the area for at least 10 years

after redesignation. In addition, the maintenance plan shall contain

contingency provisions necessary to ensure prompt correction of any

violation of the NAAQS. [See Secs. 175A(b) and (d).] EPA's guidance on

redesignations outlines 5 core provisions that are necessary to ensure

maintenance of the relevant NAAQS in an area seeking redesignation from

nonattainment to attainment. The following paragraphs describe how

Maine has fulfilled each provision.

Attainment Inventory. A PM10 emission inventory for Presque

Isle was necessary in order to analyze the impact of current and

projected emissions on the ambient PM10 air quality, to quantify

emission reductions from the MOU,2 and to determine whether

Maine's control strategy will maintain the PM10 NAAQS. Maine DEP

has inventoried residential, commercial, and industrial combustion and

process sources in Presque Isle. As detailed in the approval of Maine's

PM10 Attainment Plan, the control strategy does not require

emission reductions from these source categories. As Maine DEP's

receptor modeling showed, emissions from paved roads dominate the

PM10 inventory in Presque Isle. EPA is satisfied that Maine's

inventory is sufficiently accurate and comprehensive for purposes of

redesignating Presque Isle consistent with the requirements in

Sec. 107(d)(3)(E) and Sec. 175A. Therefore, EPA is approving Maine's

emissions inventory for Presque Isle, the details of which are embodied

in the TSD.

\2\ Maine DEP has entered a joint memorandum of understanding

(MOU) with the City of Presque Isle, which includes several measures

to abate dust re-entrainment from paved roads and open areas in the

downtown area. As part of Attainment Plan for Presque Isle, Maine

DEP has demonstrated that the control measures in Part B of the MOU

have attained and will maintain the PM10 NAAQS. (See 60 FR

2885, January 12, 1995.)

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Maintenance Demonstration. A State may generally demonstrate

maintenance of the PM10 NAAQS by either showing that future

emissions of PM10 or its precursors will not exceed the level of

the attainment inventory or by modeling to show that the future mix of

sources and emission rates will not cause a violation of the NAAQS.

Whether a dispersion or receptor model has been used to relate base

case emissions to air quality, a proportional, or rollback, calculation

may be used to show that planned emission reductions will achieve and

maintain NAAQS. For the 24-hour NAAQS these conditions are met when air

quality improvements projected from enforceable emission reductions,

including consideration of growth, result in 24-hour design values

below 150 g/m3. Emissions from both road dust and diesel

exhaust categories are expected to grow at the same rate (that is, the

rate of growth in VMT, disregarding any improvements to diesel vehicle

emissions, as determined by the Maine Department of Transportation) of

2.09%.

Maine DEP used the rollback technique or model to demonstrate that

the planned strategies result in required

[[Page 45058]]

reduction in observed PM10 concentrations so that the Presque Isle

area will maintain the NAAQS. These calculations account for growth

during the period between sample collection date and the year 2005.

Rollback was performed on the four highest observed PM10

concentrations monitored during the three year period 1987-1989, the

year in which Presque Isle attained the PM10 NAAQS. This approach

is consistent with EPA's ``PM10 SIP Development Guideline'' (EPA-

450/2-86-001: June, 1987). In summary, Maine DEP has demonstrated that

both emissions projections and proportional modeling from

implementation of the MOU will maintain the PM10 NAAQS for at

least 10 years beyond redesignation.

Monitoring Network. Once an area has been redesignated, the State

should continue to operate an appropriate air quality monitoring

network, in accordance with 40 CFR Part 58, to verify the attainment

status of the area. The redesignation of Presque Isle to attainment

will not change the monitoring network which Maine has in place. On the

contrary, the contingency plan (as described below) is based on

continued monitoring of PM10 in the Presque Isle area.

Verification of Continued Attainment. Each State should ensure that

it has the legal authority to implement and enforce all measures to

attain and to maintain the NAAQS. Sections 110(a)(2)(B) and (F) of the

Clean Air Act and regulations promulgated at 40 CFR 51.110(k), suggest

that one such measure is the acquisition of ambient and source emission

data to demonstrate attainment and maintenance.

In this redesignation request, Maine has committed to performing a

periodic inventory of emission sources in the Presque Isle area at 3

year intervals. An emission summary will be prepared and submitted in

December of the year following the year of the inventory. The detail of

the inventory will be consistent with that employed in the PM10

Attainment Demonstration SIP for Presque Isle. The first year of the

inventory will be 1996, with the subsequent summary report completed in

December, 1997.

Contingency Provisions. Section 175A(d) of the Clean Air Act

requires that a maintenance plan also include contingency provisions,

as necessary, to promptly correct any violation of the NAAQS that

occurs after redesignation of the area. The contingency plan is

considered an enforceable part of the SIP and should ensure that

contingency measures are adopted expediently once they are triggered.

The plan should clearly identify the measures to be adopted, a schedule

and procedure for adoption and implementation, and a specific time

limit for action by the State. As a necessary part of the plan, the

State should also identify specific indicators, or triggers, which will

be used to determine when the contingency measures need to be

implemented.

By virtue of incorporation into Maine's SIP, Part B of Maine DEP's

revised MOU with the City of Presque Isle will supplement the existing

control plan for Presque Isle with two contingency levels. Maine has

developed this MOU to meet the requirements of Secs. 175A(d) and

172(c)(9).

The City of Presque Isle will use salt and liquid calcium chloride

as the main source of winter antiskid control within a \1/2\ mile

radius of the Northeastland Hotel. As climatic conditions develop where

the use of salt and liquid calcium chloride is ineffective, the City

will use the harder, low percent fines material, since liquid calcium

chloride becomes ineffective at about -20 deg.F. The contingency plan

will be implemented as soon as Maine DEP notifies the City that 24-hour

PM10 concentrations of 130 g/m\3\ have been measured at

the maximum impact site. Maine DEP will know within 7 days of the

occurrence of the concentration and will notify the City immediately.

The City of Presque Isle will expand the use of salt and liquid

calcium chloride to an additional \1/4\ mile radius on roads which are

considered major arteries to the City as soon as Maine DEP notifies the

City that 24-hour PM10 concentrations of 140 g/m3

have been measured at the maximum impact site.

Maine has proposed these contingency measures that Presque Isle has

implemented voluntarily and which have resulted in a reduction of

measured PM10 concentrations. Substitution of the liquid calcium

chloride for a sand/salt mix has achieved lower silt loadings than the

current MOU requires. Voluntary implementation of this contingency plan

does not preclude its use in a contingency plan.

Control efforts in Presque Isle have focused on emissions from road

sanding. The City of Presque Isle has demonstrated its commitment to

solving the re-entrained dust problem by using durable sand containing

a low percentage of fines. More recently, the City of Presque Isle

reduced PM10 levels by using liquid calcium chloride as a de-icer

whenever temperatures permit.

As provided in Sec. 172(c)(9) of the Act, all moderate

nonattainment area SIPs that demonstrate attainment must include

contingency measures. (See generally 57 FR 13543-44.) These measures

were required to be submitted by November 15, 1993 for the initial

moderate nonattainment areas. These measures must take effect without

further action by the State or EPA, upon a determination by EPA that

the area has failed to make RFP or attain the PM10 NAAQS by the

applicable statutory deadline.

EPA is accepting Maine's contingency plan as adequate to fulfill

both Sec. 175A(d) contingency provision and Sec. 172(c)(9) contingency

measure requirements.

Applicable Requirements Under Section 110 and Part D

The requirements under Sec. 107(d)(3)(E) (ii) and (iv) listed above

are addressed in the January 2, 1994 TSD. Specifically, EPA's January

12, 1995 approval of Maine's PM10 Attainment Plan noted the only

outstanding PM10 SIP element was the Sec. 172(c)(9) contingency

measures. In approving Maine's PM10 Attainment Plan, EPA-New

England stated that the ``contingency plan'' developed to meet the

Sec. 175A(d) contingency provisions requirement for redesignation also

could satisfy those contingency measures required for initial moderate

nonattainment areas under Sec. 172(c)(9). Consequently, with the

redesignation of Presque Isle to attainment, Maine has satisfied all

Sec. 110 and Part D requirements applicable to Presque Isle for

PM10.

Final Action

EPA is approving the PM10 redesignation request, maintenance

plan, and contingency measures Maine submitted to the EPA on June 1,

1994. EPA is also approving a revision to Chapter 114 of Maine's

Department of Environmental Protection Regulations, ``Classification of

Air Quality Control Regions,'' which removes Presque Isle as a

nonattainment area for PM10. Chapter 114 was adopted by the Board

of Environmental Protection on April 27, 1994 and accepted by the

Secretary of State with an effective date of May 9, 1994.

EPA is publishing this action without prior proposal because the

Agency views this as a noncontroversial amendment and anticipates no

adverse comments. However, in a separate document in this Federal

Register publication, EPA is proposing to approve the SIP revision

should adverse or critical comments be filed. This action will be

effective October 30, 1995

[[Page 45059]]

unless adverse or critical comments are received by September 29, 1995.

If the EPA receives such comments, this action will be withdrawn

before the effective date by simultaneously publishing a subsequent

notice that will withdraw the final action. All public comments

received will then 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 on October 30, 1995.

Under the Regulatory Flexibility Act, 5 U.S.C. Sec. 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. Secs. 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.

Under Secs. 202, 203, and 205 of the Unfunded Mandates Reform Act

of 1995 (``Unfunded Mandates Act''), signed into law on March 22, 1995,

EPA must undertake various actions in association with proposed or

final rules that include a Federal mandate that may result in estimated

costs of $100 million or more to the private sector, or to State,

local, or tribal governments in the aggregate.

Through submission of this state implementation plan revision, the

State and any affected local or tribal governments have elected to

adopt the program provided for under Sec. 110 of the Clean Air Act.

These rules may bind State, local and tribal governments to perform

certain actions and also require the private sector to perform certain

duties. To the extent that the rules being approved by this action will

impose no new requirements; such sources are already subject to these

regulations under State law. Accordingly, no additional costs to State,

local, or tribal governments, or to the private sector, result from

this action. EPA has also determined that this action does not include

a mandate that may result in estimated costs of $100 million or more to

State, local, or tribal governments in the aggregate or to the private

sector.

SIP approvals under Sec. 110 and subchapter I, Part D of the CAA 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, I certify that it does

not have a significant impact on any small entities affected. Moreover,

due to the nature of the federal-state relationship under the CAA,

preparation of a regulatory flexibility analysis would constitute

federal inquiry into the economic reasonableness of state action. The

CAA forbids EPA to base its actions concerning SIPs on such grounds.

Union Electric Co. v. USEPA, 427 US 246, 256-66 (S.Ct. 1976); 42 U.S.C.

7410 (a)(2).

This action has been classified as a Table 3 action by the Regional

Administrator under the procedures published in the Federal Register on

January 19, 1989 (54 FR 2214-2225), as revised by an October 4, 1993,

memorandum from Michael H. Shapiro, Acting Assistant Administrator for

Air and Radiation. A future notice will inform the general public of

these tables. The Office of Management and Budget (OMB) has exempted

this action from review under Executive Order 12866.

Nothing in this action should be construed as permitting or

allowing or establishing a precedent for any future request for

revision to any state implementation plan. Each request for revision to

the state implementation plan shall be considered separately in light

of specific technical, economic, and environmental factors and in

relation to relevant statutory and regulatory requirements.

Under Sec. 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 October 30, 1995. 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 Sec. 307(b)(2).]

List of Subjects

40 CFR Part 52

Environmental protection, Air pollution control, Incorporation by

reference, Particulate matter, Reporting and recordkeeping

requirements.

40 CFR Part 81

Air pollution control, National parks, Wilderness areas.

Note: Incorporation by reference of the State Implementation

Plan for the State of Maine was approved by the Director of the

Federal Register on July 1, 1982.

Dated July 20, 1995.

John P. DeVillars,

Regional Administrator, EPA-New England.

Chapter I, title 40 of the Code of Federal Regulations is amended

as follows:

PART 52--[AMENDED]

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

Authority: 42 U.S.C. 7401-7671q.

Subpart U--Maine

2. Section 52.1020 is amended by adding paragraph (c)(40) to read

as follows:

Sec. 52.1020 Identification of plan.

* * * * *

(c) * * *

(40) Revisions to the State Implementation Plan submitted by the

Maine Department of Environmental Protection on June 1, 1994.

(i) Incorporation by reference.

(A) Letter from the Maine Department of Environmental Protection

dated June 1, 1994 submitting revisions to the Maine State

Implementation Plan.

(B) Revisions to Chapter 114 of the Maine Department of

Environmental Protection Regulations, ``Classification of Air Quality

Control Regions,'' adopted by the Board of Environmental Protection on

April 27, 1994 and accepted by the Secretary of State with an effective

date of May 9, 1994.

(C) Revisions to Part B of the Memorandum of Understanding which

the Maine Department of Environmental Protection (DEP) entered into

(and effective) on May 25, 1994, with the City of Presque Isle, and the

Maine Department of Transportation.

(ii) Additional materials.

(A) A maintenance demonstration and contingency plan which outline

Maine's control strategy for maintenance of the PM10 NAAQS and

contingency measures and provision for Presque Isle.

(B) Nonregulatory portions of the submittal.

3. In Sec. 52.1031 the table is amended by adding a new citation to

entry ``114'' to read as follows:

Sec. 52.1031 EPA-approved Maine regulations.

* * * * *

[[Page 45060]]

Table 52.1031.--EPA-Approved Rules and Regulations

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Date

State citation Title/subject adopted Date approved by EPA Federal Register citation 52.1020 Comments

by State

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* * * * * * *

114............... Classification of Air 4/27/94 Aug. 30, 1995........ [Insert FR citation from (c)(40) Revision to remove

Quality Control Regions. published date]. Presque Isle as

nonattainment for PM10.

* * * * * * *

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PART 81--[AMENDED]

1. The authority citation for part 81 continues to read as follows:

Authority: 42 U.S.C. 7401-7671q.

2. Section 81.320 is amended by revising the table for ``Maine--

PM10 Nonattainment Areas'' to read as follows:

Sec. 81.320 Maine.

* * * * *

Maine--PM10 Nonattainment Areas

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Designation Classification

Designated area ----------------------------------------------------------------------------------------

Date Type Date Type

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Aroostook County:

City of Presque Aug. 30, 1995........... Attainment

Isle (part)\1\.

That area

bounded by

Allen Street

from its

intersection

with Main

Street east to

Dudley Street,

Dudley Street

south to Cedar

Street, Cedar

Street west to

Main Street,

Main Street

south to

Kennedy Brook,

Kennedy Brook

northwest

crossing

Presque Isle

Stream to

Coburn Street,

Coburn Street

northwest to

Mechanic

Street,

Mechanic

Street west to

Judd Street,

Judd Street

northeast to

State Street,

State Street

northwest to

School Street,

School Street

northeast to

Park Street,

Park Street

east to Main

Street

Rest of State...... 11/15/90................ Unclassifiable

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\1\ This definition of the nonattainment area redefines its borders from the entire City of Presque Isle to this

area of 0.6 square miles which circumscribe the area of high emission densities and ambient PM10 levels. (60

FR 2885, January 12, 1995)

[FR Doc. 95-21464 Filed 8-29-95; 8:45 am]

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