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Implementation of the Landowner Preferred-Modified Alternative (Alternative 12) would result in a reduction of 113,370 tons of salt per year in the Big Sandy River, a decrease in salinity in the Green River at the town of Green River, Wyoming, of 60.92 milligrams per liter, and a decrease of 14.30 milligrams per liter at Imperial Dam, on the lower Colorado River. The land remaining under irrigation would also have a benefit of increased crop yield. No range or forest land would be treated under this alternative. Mitigation would be provided to offset the significant wildlife, wetland, and upland game habitat that would be impacted. No known unique cultural, historical, archeological, or natural resource would be disturbed by the implementation of this alternative. Prior to implementation, a cultural resource inventory will be made and regulations concerning historic and cultural properties will be complied with. The total estimated cost of implementing Alternative 12 would be about $35.9 million. This includes approximately $28.8 million for irrigation retirement on 13,700 acres, $5.5 million for structural improvements of the irrigation systems on the remaining 2,000 acres, and $1.6 million for measures to offset the adverse effects to wetlands and associated wildlife habitat. This study surfaced many issues in regard to the various alternatives evaluated and presented. Some of the issues which need to be considered are: 1) Special legislation for authority and funds to retire all or a substantial portion of present irrigated farmland. 2) Changes of political philosophy and/or institutional arrangements concerning water rights and alternative uses of water. 3) Implementing agencies and authorities. 4) Landowners' inability to financially pay for operation, maintenance, and replacement of on-farm irrigation system improvements. . ., Uj~~~U S-5