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Executive Summary <br />FEIS - Navajo Reservoir Operations <br />Table S-5-Summary comparison of alternatives retained for further analysis (continued) <br />Resource No Action Alternative 250/5000 Alternative 500/5000 Alternative <br />Operation, maintenance, Operations would be Operations would be Operations would be <br />and safety of dams within designed within designed within designed <br /> capability of Navajo capability of Navajo capability of Navajo <br /> Dam. Dam. Increased Dam. Increased <br /> monitoring of gaging monitoring of gaging <br /> stations and more stations and more <br /> frequent release frequent release <br /> changes required. changes required. <br />Hazardous materials No impacts. No impacts. No Impacts. <br />Geology and soils No impacts. No impacts. No impacts. <br />Air quality and noise No impacts. Increased dust due to increased dust due to <br /> lower reservoir levels lower reservoir levels <br /> exposing more land. exposing more land. <br />' The table presents long-term impacts. Until further water development occurs in the Basin, additional water would be <br />available to reduce impacts to various resources including irrigation, trout fishery, and recreation; this interim water would <br />diminish as development occurs. <br />z Flows have been rounded to the nearest 5 cfs. <br />3 Measured as a weekly average. <br />a Model analysis does not allow releases from Navajo Dam when water surface elevations drop below 5990 feet, so <br />15 months of the 65 years of analysis are predicted as zero. Actual operation would implement shortage-sharing for <br />Navajo Reservoir contractors and some flows less than 500 cfs would occur. <br />EIS Conclusions and Recommendations <br />After conclusion of a detailed analysis, Reclamation selected the 250/5000 Alternative <br />as the Preferred Alternative. This alternative best meets the purpose of and need for the <br />Federal action. <br />Environmental Commitments <br />Potential environmental commitments associated with modifying the operations of Navajo <br />Dam and Reservoir are described below. Mitigation measures that have been developed or <br />discussed in consultation with cooperating agencies are also discussed.