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CHAPTER III ALTERNATIVES i Recommended Plan (Alternative B) Plan concepts and estimated accomplishments The recommended plan for Stage Two provides for membrane lining three reaches of the Government Highline Canal and replacing existing open earth laterals with pipe as shown on the Features Map on the fol- lowing page. Measures are included to compensate for wildlife habitat losses that would result from plan development. Environmental commit- ments for the recommended plan are summarized in Attachment 2. Imple- mentation of the plan would reduce salt loading to the Colorado River by about 143,500 tons annually at an estimated overall cost effectiveness of about $89 per ton. Costs and salinity reduction values have been estimated, and environmental impacts have been analyzed for all 15 incre- ments of the recommended plan. However, as preconstruction design data are collected, the development of some of the increments may be deferred until other more cost-effective increments of other salinity control units are constructed. The estimated accomplishments of the recommended plan are shown in Table 5. Table 5 Estimated accomplishments (Alternative B)1/ ------- ------------------- --------- ------- ----- -------- --------- Incre- mental Overall Total to cost cost • be lined eff.ec- effec- or piped Effect ttveness tiveness Lateral and canal systems (miles) (tons/year) ($/ton) ($/ton) Price Ditch laterals 30 19,500 24 7.4 Stub Ditch laterals 3 1,600 29 24 Grand Valley Canal laterals?/ 34 13,000 44 32 Kiefer Extension laterals 10 3,400 55 34 West end portion, Government Highline Canal laterals 36 20,000 55 41 East end portion, Government Highline Canal laterals 22 6,400 55 43 West end portion, Government Highline Canal 7 8,500 58 45 Grand Valley Highline Canal laterals 22 4,800 82 47 East end portion, Government Highline Canal 11 23,300 94 58 Middle portion, Government Highline Canal laterals 73 19,800 98 64 Grand Valley Mainline Canal laterals 33 4,700 121 67 Independent Ranchmen's Ditch laterals 8 900 153 67 Orchard Mesa Canal No. 2 laterals 10 1,000 158 68 Orchard Mesa Canal No. 1 laterals 27 3,400 162 70 Middle portion, Government Highline Canal 20 13,200 268 89. Total (rounded) _____ 346 ____ __ 143,500 1/ Based on January 1984 appraisal-level data. 2/ Includes the Mesa County Ditch laterals. Unit development is scheduled over a 20-year period with construc- tion to begin in fiscal year 1986. Although cost effectiveness is being used as a basic criteria for determining the order of construction for the increments of the recommended plan, other important factors are being considered in the construction sequencing. These factors include the status of lateral organization efforts, preferences of local water user groups, and the need for a logical construction sequence. The west end portion of the Government Highline Canal is scheduled first, followed by the Government Highline Canal laterals in the west end. These increments were scheduled before others because they are federally owned and because 18