Approval and Promulgation of Air Quality Implementation Plans; Washington; Revision to the State Implementation Plan Puget Sound (Seattle-Tacoma Area) Carbon Monoxide Attainment Demonstration

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In this action, EPA is approving the attainment demonstration portion of the Central Puget Sound (also referred to as the Seattle-Tacoma Area) carbon monoxide (CO) State Implementation Plan (SIP) revision submitted to EPA on January 28, 1993, and supplemented on September 30, 1994, by the State of Washington Department of Ecology (Washington) for the purpose of documenting attainment of the national ambient air quality standards (NAAQS) for CO. The SIP revision was submitted by Washington to satisfy certain federal requirements for an approvable nonattainment area CO SIP for the Puget Sound nonattainment area in the State of Washington. The rationale for the approval of the attainment demonstration portion of this SIP revision is set forth in this notice. Additional information is available at the addresses indicated below.