Clean Air Act Approval and Promulgation of State Implementation Plan for Montana; Missoula; PMINF10 and CO Contingency Measures and Local Regulations; Disapproval of Missoula Variance Provision

ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[MT22-1-6399b, MT9-3-6561b, & MT13-2-6560b; FRL-5118-4]

Clean Air Act Approval and Promulgation of State Implementation

Plan for Montana; Missoula; PM10 and CO Contingency Measures and

Local Regulations; Disapproval of Missoula Variance Provision

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

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

revisions submitted by the State of Montana with a letter dated March

2, 1994. This submittal addresses the Federal Clean Air Act requirement

to submit contingency measures for both particulate matter with an

aerodynamic diameter less than or equal to a nominal 10 micrometers

(PM10) and for carbon monoxide (CO) for the areas in Missoula

designated as nonattainment for the PM10 and CO National Ambient

Air Quality Standards (NAAQS). Further, this submittal satisfies

several commitments made by the State in a previous PM10 SIP

submittal. Due to the completion of those commitments, EPA is proposing

to approve the related rules of the Missoula City-County Air Pollution

Control Program, as adopted by the Montana Board of Health and

Environmental Sciences on June 28, 1991 and amended on March 20, 1992

and November 19, 1993, and submitted by the Governor in letters dated

August 20, 1991, June 4, 1992, and March 2, 1994. These rules include

regulations regarding inspections, emergency procedures, minor source

construction permits, open burning, and wood waste burners. EPA also

proposes to approve minor revisions to previously approved Missoula

City-County Air Pollution Control Program Chapters VII and VIII, as

included in the March 2, 1994 submittal. Further, EPA declines to take

action on Missoula's minor source operating permit regulations.

Finally, EPA proposes to disapprove Missoula City-County Air Pollution

Control Program's Chapter X, Variances.

In the final rules section of this Federal Register, EPA is acting

on the State's SIP revisions 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

EPA's actions 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 and the direct final rule will become

effective. 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 document should do so at this time.

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

January 12, 1995.

ADDRESSES: Written comments on this action should be addressed to Amy

Platt, 8ART-AP, at the EPA Regional Office listed below. Copies of the

State's submittal and documents relevant to this proposed rule are

available for inspection during normal business hours at the following

locations: Air Programs Branch, Environmental Protection Agency, Region

VIII, 999 18th Street, Suite 500, Denver, Colorado 80202-2405; and

Montana Department of Health and Environmental Sciences, Air Quality

Bureau, Cogswell Building, Helena, Montana 59620-0901.

FOR FURTHER INFORMATION CONTACT: Amy Platt at (303) 293-1769.

SUPPLEMENTARY INFORMATION: See the information provided in the direct

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

Register.

Dated: November 29, 1994.

William P. Yellowtail,

Regional Administrator.

[FR Doc. 94-30513 Filed 12-12-94; 8:45 am]

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