Clean Air Act Approval and Promulgation of PMINF10/INF Implementation Plan for Colorado; Designation of Areas for Air Quality Planning Purposes; Steamboat Springs

ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 52 and 81

[CO-001-0006b & CO-001-0021b; FRL-5934-3]

Clean Air Act Approval and Promulgation of PM10

Implementation Plan for Colorado; Designation of Areas for Air Quality

Planning Purposes; Steamboat Springs

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 Colorado to achieve attainment and

maintenance 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), including among other things,

control measures, technical analyses, quantitative milestones and

contingency measures. The SIP was submitted by the Governor of Colorado

with a letter dated September 16, 1997 to satisfy certain Federal

requirements for an approvable SIP for the Steamboat Springs, Colorado

moderate PM10 nonattainment area, as designated effective

January 20, 1994. In addition, EPA proposes to approve the Steamboat

Springs emergency episode plan. EPA also proposes to amend the boundary

for the Steamboat Springs nonattainment area to clarify the original

description.

In the Final Rules Section of this Federal Register, EPA is

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

prior proposal because the Agency views this as a noncontroversial

revision 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be withdrawn and all public comments received will be addressed in a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 30, 1998.

ADDRESSES: Written comments on this action should be addressed to

Richard R. Long, 8P2-A, 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 Program, Environmental Protection Agency,

Region VIII, 999 18th Street, suite 500, Denver, Colorado 80202-2405;

and Colorado Department of Health, Air Pollution Control Division, 4300

Cherry Creek Drive South, Denver, Colorado 80222-1530.

FOR FURTHER INFORMATION CONTACT: Amy Platt, Air Program, EPA, Region

VIII, at (303) 312-6449.

SUPPLEMENTARY INFORMATION: See the information provided in the Direct

Final action which is located in the Rules Section of this Federal

Register.

Dated: November 4, 1997.

Jack W. McGraw,

Acting Regional Administrator.

[FR Doc. 97-33959 Filed 12-30-97; 8:45 am]

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