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installation of pollution controls at Navajo Generating Station, a 

 2,250 megawatt coal-fired power plant in Page Arizona, to achieve 

 a 90 percent reduction in sulfur dioxide emissions. The final 

 rule, consistent with an agreement reached by the principal 

 parties, provides greater visibility protection for the Grand 

 Canyon and the many nearby Class I areas, and at a lower cost, than 

 EPA's initial proposal. The U.S. Court of Appeals for the Ninth 

 Circuit upheld EPA's final rule in a 1993 decision. 



To address other sources of visibility impairment in the Grand 

 Canyon region, the Clean Air Act Amendments of 1990 required EPA to 

 establish the Grand Canyon Visibility Transport Commission. The 

 Commission's charge is to assess visibility impairment affecting 

 the Grand Canyon and 15 other parks and wilderness areas on the 

 Colorado Plateau, and make recommendations to EPA by November 1995, 

 as to what measures, if any, are needed to remedy existing and 

 prevent future impairment of visibility in these specially 

 protected Class I areas. The National Park Service has a non- 

 voting seat on the Commission, and actively participates on the 

 various committees. 



While we support the Commission's goals and efforts, we also 

 recognize the challenges before it. The Commission has produced an 

 ambitious work plan, and will soon publish a prodigious request for 

 proposal to perform an assessment of visibility management options. 

 As with SAMI and New Source Review Reform, the abilities of various 



