Approval and Promulgation of Air Quality Implementation Plans; Colorado; Designation of Areas for Air Quality Planning Purposes, Steamboat Springs

摘要

EPA is taking final rule action to approve a State Implementation Plan (SIP) revision submitted by the State of Colorado on July 31, 2002, for the purpose of redesignating the Steamboat Springs, Colorado area from nonattainment to attainment for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM 10 ) under the 1987 standards. The Governor's submittal, among other things, documents that the Steamboat Springs area has attained the PM 10 national ambient air quality standards (NAAQS), requests redesignation to attainment and includes a maintenance plan for the area demonstrating maintenance of the PM 10 NAAQS for ten years. On August 5, 2004, EPA proposed to approve (69 FR 47399) in parallel with a direct final rule (69 FR 47366) Colorado's Steamboat Springs submittal in conjunction with Colorado's submittal to redesignate Lamar, Colorado. However, adverse comments pertaining to the Lamar PM 10 redesignation were received during the public comment period, therefore, EPA withdrew the approval of Lamar and Steamboat Springs. Since no comments were received during the public comment period on the approval of redesignating Steamboat Springs,