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Operation and maintenance cost of the recommended off-farm distribution system would be $50,000 annually. Total cost for the recommended plan, including $2,435,000 for technical assistance, $595,000 for monitoring activities and $420,000 for information and education activities is $10,350,000. Total annual program cost of the onfarm and off-farm systems, including operation and maintenance costs of $70,000 is $964,800. Downstream annual benefits are $1,037,800 based on a reduction of 1.9 milligrams per liter in salt concentration in the Colorado River at Imperial Dam near Yuma, Arizona. Surface flow to Lake Mead would be increased by 5,500 acre-feet annually and groundwater flow reduced by 4,700 acre-feet annually. The value of the 800 acre-feet of water not consumed is $44,000. Annual onfarm benefits accruing from implementing Alternative 5 are $121,700. This includes annual labor savings of $17,700. Total program benefits are $1,293,500 annually for a 50-year period. Based on 18,700 tons of salt reduction per year, and federal annual cost of $715,800, the cost effectiveness is about $38 per ton of salt removed. There will be no impact to the 1,189 acres of natural wetlands in the study area. About 43 acres of the 2,868 acres of irrigation- induced wetland habitat will be lost or will convert to upland wildlife habitat by installation of the pipelines. Another 215 acres of irrigation-induced wetlands may be impacted by the installation of onfarm practices. Together, this represents about 6 percent of the total wetlands. Replacement of habitat values lost by installation of the project will be encouraged through a voluntary program. Better quantity and quality water delivered to the Overton Wildlife Management Area near Lake Mead will allow,enhanced management and development of additional wetland and upland habitat. 003132 I I I I I I I I I I I Physical land treatment of rangeland in Moapa Valley can not be justified and is not considered in this plan. There is no forest land. Unique cultural, historical, archaeological, or natural resources will not be significantly impacted by the installation of proposed measures. Implementation of the Recommended Plan would require a 70 percent or greater federal cost-share assistance to assure adequate participation, Land users, Clark County, and the state of Nevada would furnish the remaining 30 percent or less, plus annual operation, maintenance, and replacement costs. Proper irrigation water management of the improved systems will be essential to achieve the salinity control objectives. Monitoring of irrigation water management and related resources affected by the improvements will be continued and expanded to assess impacts of proposed salinity control measures. Monitoring will continue for two years after implementation of all practices. Hi l'-" ,_ . _..,.~...... . . -".,- --i:~,_.--+-,.