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<br />",-",~,_L-.. _ ., <br /> <br />- <br /> <br />":" <br />.... <br />~ <br /> <br />...' <br /> <br />,- <br />~ <br /> <br />S01.ITHERN NEVADA WATERA1.ITHORITY - TREATMENT AND TRANSMISSION FACIUTY <br /> <br />Future expansion of the Proposed Project beyond the 2025 phase would depend on water <br />demands of Valley and the availability of resources. Therefore, phasing of future expansions <br />beyond 2025 cannot be determined at this time. <br /> <br />POTENTIAL ENVIRONMENTAL IMPACTS OF FUTURE TTF PHASES <br /> <br />As a result of the uncertainty of construction phasing beyond 2025, potential impacts for <br />future expansion cannot be quantified at this time. Additional NEPA documentation may be <br />required to support this future expansion as it occurs. The potential future Federal actions <br />which may require additional NEPA documentation would be the same as those described for <br />the Proposed Project. <br /> <br />Future expansion of the WTF, pumping stations, and water transmission lines could result in <br />potential environmental impacts. This future expansion would involve additional construction <br />and expanded operation of the WTF, pumping stations, and water transmission lines. The <br />water transmission system may require expansion of water treatment facilities, and possibly <br />. a third River Mountains tunnel or other type of conveyance. Potential future impacts as a <br />result of construction and operation to buildout capacity of the proposed Out-Valley project <br />components are listed by environmental discipline in Table S-3. Information in Table S-3 <br />assumes that the Preferred Alternative (SI-' C) described in this EIS has been implemented. <br /> <br />THE SELECTION OF THE PREFERRED ALTERNATIVE <br /> <br />Based on the results of the analyses presented in the EIS, Alternative SI-' C (Saddle Island <br />Intake to River Mountains WTF, using the existing River Mountains Tunnel) was selected as <br />the Out-Valley portion of the Preferred Alternative. Alternative SI-' C was selected as the <br />preferred Out-Valley alternative after an independent environmental evaluation of each of the <br />five candidate Out-Valley alternatives. Alternative SI-' C, coupled with the In-Valley system, <br />forms the complete preferred water delivery system alternative. This alternative achieves the <br />objectives and meets the purpose and need of the project in an environmentally-sensitive <br />manner. <br /> <br />A Preferred Alternative consists of four components: an intake site, a WTF site, a transmission <br />route to connect the intake and WTF site, and an In-Valley system to deliver water to specified <br />locations. Three of these components required choices to be made among a number of <br />possibilities; the fourth (the In-Valley system) is the most favorable In-Valley route identified <br />in a separate analysis, These possibilities are shown on Figure S-2. The best combination of <br />these three components would be combined with the In-Valley Transmission System to <br />produce the Preferred Alternative. <br /> <br />A matrix evaluation process revealed the Preferred Alternative to consist of: <br /> <br />. the Saddle Island intake site, <br /> <br />. the River Mountains Water Treatment Facility site, <br /> <br />. the SI-' C transmission route to connect the intake and WTF site, and <br /> <br />. the In-Valley Transmission System. <br /> <br />S-12 SUMMARY <br />