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<br />[3 Executive Summary <br />S-24 <br />DEIS - Navajo Reservoir Operations <br /> <br />Table S-5-Summary comparison of alternatives retained for turther analysis (continued) <br /> <br /> 250/5000 (Flow 500/5000 Alternative <br /> Recommendations) <br />Resource No Action Alternative Altemative <br />Reservoir vegetation and Less impact to existing Minimal additional Moderate additional <br />wildlife wetland and riparian impacts to wetland and impacts to wetland and <br /> vegetation and riparian vegetation and riparian vegetation and <br /> associated wildlife associated wildlife related wildlife habitat <br /> habitat as compared to habitat associated with associated with greater <br /> action alternatives. greater reservoir reservoir fluctuations. <br /> fluctuations. <br />Land use Current land uses not 56,130 acres of Possible reduction of full <br /> aHected by reservoir additional irrigation land NIIP development. <br /> operations. Possibly no developed under NIIP. <br /> future development of <br /> NIIP lands. <br />Cultural resources Reservoir fluctuations Reservoir fluctuations Reservoir fluctuations <br /> continue to impact impact cultural impact culturai <br /> cultural resources in resources; impact less resources; impact <br /> reservoir basin. than No Action but between that of <br /> greater than 500/5000 No Action and 250/5000 <br /> Alternative. Alternatives. <br />Flood control and Flood control operations Flood control operations Flood control operations <br />erosion of Navajo Dam met; of Navajo Dam met; of Navajo Dam met; <br /> maximum releases maximum releases maximum releases <br /> limited to 5,000 cis. limited to 5,000 cfs; limited to 5,000 cfs; <br /> increased frequency of increased frequency of <br /> releases of 5,000 cfs releases of 5,000 cis <br /> would cause bank would cause bank <br /> erosion until river erosion until river <br /> stabilized itself or banks stabilized itselt or banks <br /> stabilized. stabilized. <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 impacfs. 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 /> <br />I 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 />