Approval and Promulgation of Air Quality Implementation Plans; Montana; State Implementation Plan for Libby PMINF10 Nonattainment Area

ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[MT6-1-5485b and MT20-1-6355b; FRL-5053-8]

Approval and Promulgation of Air Quality Implementation Plans;

Montana; State Implementation Plan for Libby PM10 Nonattainment

Area

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

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SUMMARY: EPA proposes to approve the State implementation plan (SIP)

submitted by the State of Montana to achieve attainment of the National

Ambient Air Quality Standards (NAAQS) for particulate matter with an

aerodynamic diameter less than or equal to a nominal 10 micrometers

(PM10). The SIP was submitted by Montana to satisfy certain

federal requirements for an approvable nonattainment area PM10 SIP

for Libby. In the final rules section of this Federal Register, EPA is

approving the State's SIP revision, as a direct final rule without

prior proposal because the Agency views this as a noncontroversial

revision amendment and anticipates no adverse comments. A detailed

rationale for the approval is set forth in the direct final rule. If no

adverse comments are received in response to this proposed rule, no

further activity is contemplated in relation to this rule. If EPA

receives adverse comments, the direct final rule will be withdrawn and

all public comments received will be addressed in a subsequent final

rule based on this proposed rule. 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.

DATES: Comments on this proposed rule must be received in writing by

September 29, 1994.

ADDRESSES: Written comments should be addressed to Meredith A. Bond at

the EPA Regional Office listed below. Copies of the documents relevant

to this proposed rule are available for public inspection during normal

business hours at the following locations. The interested persons

wanting to examine these documents should make an appointment with the

appropriate office at least 24 hours before the visiting day.

U.S. Environmental Protection Agency, Region VIII, Air Programs Branch

(8ART-AP), 999 18th Street, suite 500, Denver, Colorado 80202-2405

Montana Department of Health and Environmental Sciences, Air Quality

Bureau, 836 Front Street, P.O. Box 200901, Helena, Montana 59620-0901

FOR FURTHER INFORMATION CONTACT: Meredith Bond at (303) 293-1764.

SUPPLEMENTARY INFORMATION: See the information provided in the direct

final rule which is located in the rules section of this Federal

Register.

List of Subjects in 40 CFR Part 52

Environmental protection, Air pollution control, Incorporation by

reference, Intergovernmental relations, Particulate matter, Reporting

and recordkeeping requirements.

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

Dated: August 3, 1994.

Jack McGraw,

Acting Regional Administrator.

[FR Doc. 94-21311 Filed 8-29-94; 8:45 am]

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