Approval and Promulgation of State Implementation Plans; Call for Visibility SIP Revision for Colorado Class I Visibility Protection

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EPA hereby gives notice that in a September 22, 1999 letter it notified the Governor of Colorado that the Colorado State Implementation Plan (SIP) for Class I Visibility Protection (Visibility SIP) is substantially inadequate to make reasonable progress toward the National visibility goal, as specified in section 169A(a)(1) of the Clean Air Act. Specifically, Colorado's Visibility SIP is substantially inadequate to remedy existing and prevent future man-made visibility impairment in Mt. Zirkel Wilderness Area and must be revised.