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tion of the Navajo GeneraLing Station to wintenime visibil- ity degradation in several units of the National Parks in lhe Colorado Plale3u. Major monitoring sites were set up in Grand Canyon and Canyonlands National Parks. Research. ers injected a tracer into the stacks at thegenerating staLion. Emissions of the tracer were tracked and concentrations measured at siteS in the parks to establish lhe quanLitaLive contribution of the Navajo GeneraLing Station to air poilu. tion in the canyon and at oLher park lands. Initial measurements lhroughout Grand Canyon National Park identified Hopi Point as the site oflhe highest concenuations of tracer, the researchers then set up an imensive monitoring system there. After analyzing nearly 2S.OCXJ samples of emissions as well as wimenime meteor. ologic conditions and emission plume trajectories, the swdy made !.he following conclusions: E -= - -. - A draftofa final report issued by the National Park Service on April 7, 1989. identifies the Navajo Generating Sl.ation at Page. Arizona. as lhe source of up to 70% of lhe visible polluLion in Grand Canyon National Park in winter months (November . March). The visuaJ data from the swdy is dramatic, with lhe features and colors of !.he opposite rim almost completely obscured and muted by lhe sulfate. laden haze for approltimately flfteen days ofeachof these months, Good visibility is considered by many to be one of the park's critical values. As the park's superinten. dent, lack Davis. said recently. "Grand Canyon ishere to be seen and to be seen clearly." Ten years of inaction by lhe plant had precipitated the intensive and eltpensive National Park Service study. Now that the culpability for wintenime haze a1 the Grand Canyon has been assigned unequivocally LO the plant. the owners' response has ~ LO question the scientific meth. odology of me study and LO call for more studies. ~- - - EPA administrator William Reilly may be forced to confront the Interior Department and !.he White House: in enforc. ing EPA's visibililY program in the West. The internal connicts of the Interior Ocpartmc:rll. which contains me Bureau of Recla. mation and the NaLional Park Service. will force a tug of war, with the Grand Canyon and Cob- rndo Ptateau caught in the middle. This action will be a test of the Bush administration's commit. ment to the environment and to clean air. . Vi_ f'~ tll~ sa_ poilll (JJ tM SlJWW! I~ of dlJy. two dlJys ~(uliu n\lisibilityislLssthmlJOnti/uiiltMCail)'Ol'l. (I) The Navajo Generating Station is the single largest con. tributor LO visibility imp3.innent at the Grand Canyon on CX) percent of the episode days during the winter. (2) lhe Navajo Generating Station, on the average. eauses 40-50 percent of the visibility impairment during the winter. and (3) on days with the worst visibility during the winter, lhe Navajo Generating Station is highly likely to cause: 70 percent of the observed visibility degradation. The final Environmental Sla1.cment issued in 1987 for the plant stated that .'the panicipants have committed themselves to installing S~ removal systems on all three units at the NGS." As these agencies lock homs. 'The Grand Canyon Trust.along with the Environmental De. fense Fund. wiD be working this summer and fall to press the EPA. the Interior Department. and members of Congress to take strong action to implement pollution controls al the Navajo Generating Station and protect the Grand Canyon from further harm. TM Grand Canyon Trust nudJ your support to sustain this important effort. We urge )'0" to wrjte to William Reilly. EPA Administrator and express yo"' concern owr (M air pollwwnfrom 1M Navajo Genualing Station and its ~ffecrs on \lisibiliry in the Grand Canyon. TIlL address to write to is: William Reilly. Administrator. En....iro~ntal Protte. twn Agency, 401,\1 Strut, S,W.. Washington.D.C. 20460. .5.