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Alternative 4 was chosen for further evaluation because it was determined to meet both the project purpose and need and endangered fish requirements in a manner not resulting in significant environmental water quality concerns. Despite concerns about its ability to meet project purpose and need, Alternative 6 also was selected for a more in-depth evaluation. The analysis showed that Alternative 6 would have difficulty in developing a water supply with a firm yield; that the priority date associated with water obtained under Alternative 6 would most likely not be considered a senior right with regards to other users; that the amount of time involved in securing water through Alternative 6 raised issues as to whether the Colorado Ute Tribes would ever receive all the water contemplated under the original settlement; and that the Colorado Ute Tribes would not support , Altemative 6 as a settlement of their water rights claims. Alternatives 4 & 6 were renamed as "refined alternatives" to reflect additions and changes made to the alternatives based on suggested changes received during public scoping, including the addition of the Navajo Nation Municipal Pipeline. Other modifications were made to the two alternatives to reduce projected impacts. The Navajo Nation requested that a water conveyance pipeline be included as a structural component of the ALP Project, to upgrade the service now being provided for seven Navajo Nation chapters in the Farmington-Shiprock area, and to replace a deteriorating 30-year old pipeline now in place. Three alternatives were evaluated to fulfill this request: (I) replace the existing pipeline with a new, larger pipeline; (2) make improvements to the existing pipeline, but di vide into two separate sections with the western section bdng supplied water from the San Juan River at Shiprock and treated through an upgraded water treatment facility there; and (3) make use of the existing Navajo Indian LITigation Project system and construct a new surface water reservoir, new pipelines, and ancillary facilities to serve the seven Navajo Nation chapters. D. Clean Water Act Compliance The Bureau of Reclamation (Reclamation) is complying with the Clean Water Act (CWA) under the provisions of section 404(r) of the Act. Under this section, Reclamation prepared an analysis of wetlands impacts under the guidance of Section 404(b)(I) of the cWA and has forwarded the FSEIS, including the requisite analysis under the guidelines, to Congress. The 404(b)(1) analysis ensures substantial compliance with standard permitting requirements. RA4 and RA6 were both evaluated under the 404(b)(I) guidelines. The analysis showed that RA 6 presented potentially significant environmental impacts to wetlands and endangered species habitat. This included both the non-structural components involving leaving water on the land but implementing water conservation measures, and the non-structural component of taking the water off the land for M&I use elsewhere. Both would result in the loss of a significant quantity of wetlands. The Fish and Wildlife Service, in its Planning Aid Memorandum of 8