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<br />_",'_"_'_':~ ?____,..~ ~. "'::..~,..~ ,~."'>.'<Mof~ ~-.'~'" <br /> <br />Table of Contents <br />( continned) <br /> <br />8.5 Summary of Alternatives Evaluation and Selection of Alternatives for Further <br />Refinement and Study ..........................,....., _ . , . . . . . . . . . , . . _ S-25 <br />8.5.1 Environmental Impact Summary ........ _. _. . , . , . . . . . . . .... _. ... .. S-25 <br />8.5.2 Purpose and Need Summary .................. _ , . . . . _ . . . . . _ . . . . . . S-28 <br />8.5.3 Technical and Economic Summary ..........,.,.................,. S-28 <br />8.6 Selection of Alternatives for Further Study. . . . . _ . . . . . . . . . . . _ _ . . _ . . . . . _ . . . . . S-28 <br /> <br />9.0 DESCRIPTION OF ALTERNATIVES SELECTED FOR FURTHER REFINEMENT. . . . . S-35 <br />9.1 Refined Alternative 4 . . . . - . . . . . . . . . . . . . . . . . . . _ . . . . . . . , . _ . . . . . _ . . . . , . . . . S-35 <br />9.1.1 Structural Components of Refined Alternative 4 ... . .. . . ... '" .. .. .. .. S-36 <br />9.1.2 Non-Structural Component of Refined Alternative 4 .., _ . . . . . . . . . . . . . . S-42 <br />9.2 Refined Alternative 6 . . . . . . . . . . . . _ . . . . . _ . . . . . . . . . . . . . . . . . , , . _ . . . . . . . . _ . S-42 <br />9.2.1 Component of Refined Alternative 6 Commensurate with Refmed <br />Alternative 4 for Developing up to 57,100 af'y of Depletions to Serve <br />Municipal and Industrial Needs ........... _ . . . . . . . . . . . . . . . . . _ . . . . . S-43 <br />9.2.1.1 Purchase of Land and Water Rights to Yield 17,432 af'yof <br />Depletions. . . . . . . . . . . . . . . . . . . . . . . . . . . _ . . . . . _ . . . . . . _ . . . . . S-43 <br />9.2,1.2 Coordinated Operation of Existing Storage Reservoirs with <br />Streamflows for Increased Availability of Water under Refined <br />Alternative 6 .. - . . . . . . . . . . . . . . . . . . . . . . . . . _ . . . . . . . . . _ . . . . S-44 <br />9.2. I.3 Purchase of Storage Space in Red Mesa Reservoir. . . . . . . . . . . . . . S-44 <br />9.2.1.4 Enlarging Lemon Reservoir. . . . . . . . . . . . . . . . . . . . . . . . _ . . . . . . . S-44 <br />9.2.2 Component of Refined Alternative 6 (Commensurate With the <br />Non-structural Component of Refined Alternative 4) ..,............, _ . S-46 <br />9.2.2.1 Purchase of Land and Water Rights in Animas and Florida River <br /> <br />Basins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _ . . . . . . _ . . . . . . . . S-46 <br />9.2.2.2 Purchase of Land and Water Rights in McElmo Creek (Montezuma <br /> <br />County) ...,........................... _ . . . . . . . . . . . . . . . S-46 <br />9.2.3 Other Elements ofRefineci Alternative 6 . . . . . . . _ . . . . . . . . . . . . . . . . . . . . S-46 <br />9.2.3.1 Navajo Nation Municipal Pipeline _.' _ . . . . . _ . . . . . . . . . . . . . . . . S-46 <br />9.2.3.2 Design for Avoidance of Wetland Impacts. . " . . ...... .., ... .. S-46 <br />9.3 COMPARISON OF REFINED ALTERNATIVE 4 AND REFINED <br />ALTERNATIVE 6 ...... __ .' --. -... .... .. .... ..... . .. .. .. _... ...... .. S-46 <br /> <br />10.0 PURPOSE AND NEED, RECOMMENDATIONS, AND ENVIRONMENTAL <br /> <br />COMMITMENTS. . . . . . . . . . . . . . . . . . . . . _ . . . . . . . , . . . . . . . . . . . . . . _ . . . . . . . . . . . _ . . S-57 <br />10.1 INTRODUCTION. . .. . . . . . .. . .. .. . . .. .. . . . . .. .. . . . . . . .. .. . . _ . .. .. _ . . . S-57 <br />10.2 EXPLANATION OF PURPOSE AND NEED .................... _. _. S-57 <br />10.2.1 Purpose and Need Factors .............. _ . . . . . . . . . . . . . . . . . . . . . . . . S-58 <br />10.2.1.1 Yield -............ _. ... .. ... . _.. . . . . ... . . .. . . .. .. _, S-59 <br />10.2.1.2 Practicability. . . . . . . . . . . . . _ . . . . . . . . . . . . . . . , . . . . . . . . . . S-60 <br />10.2.1.2.1 Socioeconomic Issues .................... _.. _. S-60 <br />10.2.1.2.2 Changes in Water Use ........................, S-61 <br />10.2.1.2.3 Timing. . . . . . . . . . . . . . . _ . , _ . . . . . . . . . . . . . . . . . . S-62 <br />10.2.1.2.4 Indian Trust Assets .. _.. . ..... . ... ... . ...... . S-62 <br />10.2.2 Conclusion ..... _ . . . . . . . . . . . . . . . . . . . . _ . . _ . . . . . . . . . , . . . . . _ . . . . . S-63 <br /> <br />S-ii <br />