95-7005. Clean Air Act Approval and Promulgation of State Implementation Plan for Montana; Butte; PMINF10 Contingency Measures and Revisions to the Attainment and Maintenance Demonstrations

[Federal Register Volume 60, Number 55 (Wednesday, March 22, 1995)]
[Proposed Rules]
[Page 15104]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-7005]



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ENVIRONMENTAL PROTECTION AGENCY
40 CFR Part 52

[MT26-1-6692b; FRL-5163-9]


Clean Air Act Approval and Promulgation of State Implementation 
Plan for Montana; Butte; PM10 Contingency Measures and Revisions 
to the Attainment and Maintenance Demonstrations

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 August 
26, 1994. This submittal addresses, for the Butte moderate PM10 
nonattainment area, the Federal Clean Air Act requirement to submit 
contingency measures for particulate matter with an aerodynamic 
diameter less than or equal to a nominal 10 micrometers (PM10) for 
areas designated as nonattainment for the PM10 National Ambient 
Air Quality Standards (NAAQS). This submittal also includes revisions 
to the attainment and maintenance demonstrations for the moderate 
PM10 nonattainment area SIP for Butte due to the inclusion of new 
emission limits in a revised air quality permit for Montana Resources, 
Inc. Since the SIP adequately addresses the requirement for contingency 
measures and, with the new emission limits for Montana Resources, Inc., 
still adequately demonstrates attainment and maintenance of the 
PM10 NAAQS in Butte, EPA proposes to approve these revisions.
    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be withdrawn and all public comments received will be addressed in a 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 
April 21, 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 [phone].

SUPPLEMENTARY INFORMATION: See the information provided in the Direct 
Final action which is located in the Rules Section of this Federal 
Register.

    Dated: February 17, 1995.
Jack McGraw,
Acting Regional Administrator.
[FR Doc. 95-7005 Filed 3-21-95; 8:45 am]
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