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Table 8.12: Alternative 7 cost analysis summary <br /> Estimated Cost <br /> Preliminary Engineering $270,000 <br /> Design & Construction $32,373,000 <br /> New Operating Costs $358,500 Per Year <br /> Avoided Operating Costs $112,200 Per Year <br /> Life-Cycle Cost (NPV) $31,781,000 <br /> Life-Cycle Cost (NPV) $9,190 Per MG/Year <br /> Life-Cycle Cost (NPV) $2,994 Per AFY <br /> Notes: NPV for 50 year period, 3%real discount rate <br /> Preliminary Studies Before implementation, it is recommended that preliminary studies <br /> be conducted to evaluate several important aspects of the potential water supply project. The <br /> recommended studies include preliminary legal and environmental due diligence,review of mine <br /> operation and design records or a bathymetry study to determine the storage capacity of the <br /> mine,and a recharge and water quality study to evaluate the potential of the supply for blending. <br /> These recommendations are discussed in Section 11. <br /> 8.11 Water Efficiency <br /> In contrast to the water supply alternatives described above, water efficiency is a demand-side <br /> strategy. Existing water efficiency efforts should continue, and others should be considered in <br /> concert with selected water supply alternatives. Improved water efficiency has an amplifying <br /> effect on the benefits received from investments in other water supply improvements. The City's <br /> ongoing program of leak detection and repair will continue to mitigate water losses in the distri- <br /> bution system. General trends in household water efficiency will continue to gradually reduce <br /> per capita consumption as older fixtures are replaced with newer, more efficient ones. Major <br /> industrial customers ADM, Tate& Lyle, and others may pursue water efficiency improvements <br /> in their operations, reducing their demand for water. In 2017, a 10% reduction in summer <br /> outdoor water use for irrigation would have resulted in a savings of approximately 129 MG in <br /> water consumption. Based on 2017 water use by major industrial customers ADM and Tate & <br /> Lyle, a 5% improvement in water efficiency would have resulted in a reduction of approximately <br /> 436 MG in total withdrawals from Lake Decatur. Increased water efficiency effectively reduces <br /> the supply gap by the volume of water saved. To the extent that improved water efficiency <br /> stretches the benefits of investments in water supply improvements and allows for the deferral <br /> of future investments, it can be highly cost-effective. <br /> 119 <br />