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City of Rifle Water Conservation Plan <br />7.2 <br />Final Report -July 2008 <br />mgd. Thus, water production capacity expansion beyond 10 mgd would be deferred by <br />about 7 years as compared to the "no conservation" condition. <br />Modified Potable System Improvements Forecast <br />Re-forecasted water demands allow for the timing and capacity of water system <br />infrastructure projects to be modified. Table 7-2 below presents a summary of re- <br />forecasted water system improvement project costs. Appendix A contains a detailed <br />listing of individual projects. The main effects of conservation are: <br />• Immediate BCWTP (or other) production capacity improvements would be able to be <br />delayed one to two years (bumped from 2010 to 2011/12) <br />• The major expense for a new WTP to replace the GMWTP could be delayed by about <br />three to four years (2014 to 2017/18). <br />• A final production capacity expansion within the study period could be delayed six to <br />seven years (2025 to 2031/32). <br />• Storage/distribution improvements could be deferred about 2 years, on average. <br />• Within a 20-year planning timeframe peak day production needs could be reduced by <br />almost 1.9 mgd, which might be expected to translate into about $2.8 million in water <br />treatment capacity savings. In Table 7-2, this is accounted for by a reduction in the <br />cost of the final plant expansion, which is shown as deferred unti12031. The cost <br />savings, alternatively, could be achieved by constructing a lower-capacity <br />replacement plant for the GMWTP in 2017. <br />[Note: During development of this plan, the infrastructure plan for the "no conservation" <br />case was continuing to evolve due to changing water demand projections and in response <br />to the findings of various studies. The "no conservation" water system capital <br />improvements plan has changed since the completion of this conservation plan, and thus <br />the ability of conservation to defer certain projects will change; however, the changes are <br />not anticipated to affect the major findings of this plan -that is, the projected value of <br />conservation in reducing peak demand and long-term infrastructure capacity needs and <br />associated costs.] <br />SGM # 99055A-388 38 Integrated Resources and <br />Modified Forecasts <br />