Approval and Promulgation of State Implementation Plans; California State Implementation Plan Revision, North Coast Unified Air Quality Management District and Northern Sonoma County Air Pollution Control District

Environmental Protection Agency (EPA).

Proposed rule.

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EPA is proposing to approve revisions to the California State Implementation Plan (SIP). This action is an administrative change which revises definitions in North Coast Unified Air Quality Management District (NCUAQMD) and Northern Sonoma County Air Pollution Control District (NSAPCD) Rule 130, Definitions. The intended effect of proposing approval of these rule is to incorporate changes to the definitions for clarity and consistency with revised federal and state definitions. EPA is proposing approval of these rules to be incorporated into the California SIP for the attainment and maintenance of the national ambient air quality standards (NAAQS) under title I of the Clean Air Act, as amended in 1990 (CAA or the Act). In the Final Rules Section of this Federal Register, the EPA is approving these rules as a direct final rule without prior proposal because the Agency views this as noncontroversial amendment and anticipates no adverse comments. A detailed rationale for this approval is set forth in the direct final rule. If no relevant adverse comments are received in response to this action, no further activity is contemplated in relation to this proposed rule. If EPA receives relevant adverse comments, the direct final rule will not take effect 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.

Comments must be received in writing by March 11, 1999.

Written comments on this action should be addressed to: Andrew Steckel, Rulemaking Office (AIR-4), Air Division, U.S. Environmental Protection Agency, Region 9, 75 Hawthorne Street, San Francisco, CA 94105-3901. Copies of the rule revisions and EPA's approval of each rule are available for public inspection at EPA's Region 9 office during normal business hours. Copies of the submitted rule revisions are also available for inspection at the following locations: Environmental Protection Agency, Air Docket (6102), 401 ``M'' Street, S.W., Washington, D.C. 20460. California Air Resources Board, Stationary Source Division, Rule Evaluation Section, 2020 ``L'' Street, Sacramento, CA 95812. North Coast Unified Air Quality Management District, 2300 Myrtle Avenue, Eureka, CA 95501. Northern Sonoma County Air Pollution Control District, 150 Matheson, Healdsburg, CA 95448.

Cynthia G. Allen, Rulemaking Office (AIR-4), Air Division, U.S. Environmental Protection Agency, Region IX, 75 Hawthorne Street, San Francisco, CA 94105-3901, Telephone: (415) 744-1189.