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co! .... ~ ... . " -, SOUTHERN NEVADA WATER AUTHORITY - TREATMENT AND TRANSMISSION FAClUIT reasonably anticipated actions should the Proposed Project not occur. Analysis of the No Action Alternative provides a benchmark for comparing the effects of the alternatives evaluated in this EIS. Under the No Action Alternative, only the upgraded SNWS project would be used to pump, treat, and deliver Colorado River water to the Valley, The upgraded SNWS (480 mgd) would need to be operated at its maximum production rate of approximately 570 million gallons per day (mgd). To operate the SNWS at its maximum production rate. the following activities would need to occur: . Additional In-Valley pipelines, pumping stations, and reservoirs would be needed to convey the water into the Valley, since the current In-Valley distribution system cannot accommodate more than 480 mgd, assuming completion of current improvements to the SNWS facilities in the Valley, Approximately 230,000 feet of additional pipeline would need to be constructed, compared to 361,000 feet under the Proposed Project. An additional four pumping stations and four reservoirs would also be needed. These facilities would enable the upgraded SNWS to deliver its maximum production rate of 570 mgd. . The power supply infrastructure to the upgraded SNWS facilities would need to be improved. This new infrastructure would include a smaller substation on the eastern side of the River Mountains, new and upgraded 230 kV power lines, and new 69 kV power line to the existing intake pumping station at Saddle Island as described for Alternative 51-1 B. . Additional power supply infrastructure would also be needed to operate the pumping stations and reservoir on the western side of the River Mountains. This infrastructure would include a new substation on the western side of the River Mountains and 69 kV powerline to the Foothill site as described for Alternative SI-1 B. These activities are considered reasonable and foreseeable future responses under the No Action Alternative. Improvements to the power supply infrastructure to the upgraded SNWS were previously described as a related project under the EA for the SNWS Improvements (Reclamation, 1994d: 14-1), but at that time were anticipated to be completed by Nevada Power Company. Federal Actions related to these activities would be the same as for the Proposed Project. Major assumptions related to the evaluation of the No Action alternative include water conservation measures in the Valley, the construction and operation of wastewater reclamation/reuse facilities, groundwater recharge, and use of the Valley's shallow aquifer. PHASING OF THE SNWA-TTF PROJECT The ultimate design capacity of the proposed SNWA-TTF facilities is approximately 600 mgd, under normal operating conditions; however, facilities would be constructed in phases to match water demands and satisfy reliability needs, Design capacity of the various components of the SNWA-TTF Out-Valley system for projected demands through the year 2025 (facilities analyzed in this document) and at ultimate buildout are shown in Table S-2. Additional 5-10 SUMMARY