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<br />I <br />I <br />J <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />j <br />I <br />I <br /> <br />Table 3. Social and environmental impacts of each viable Plan Element were <br />identified and assessed by the City Council and Yater Board. <br /> <br />Evaluations of Plan Elements performed in the Phase II study resulted, in <br /> <br /> <br />some cases, in different conclusions than the preliminary Phase I <br /> <br /> <br />evaluations. These differences were due to the revised operational factors <br /> <br /> <br />described above and the resultant impact on the performance of individual <br /> <br /> <br />Plan Elements. <br /> <br />Evaluation of Yater Treatment Issues - The capacity of the City's water <br /> <br /> <br />treatment plant at Chasteen Grove is currently 30 million gallons per day <br /> <br /> <br />(mgd). Based on water use projections under the moderate population growth <br /> <br /> <br />scenario, an analysis of the City's treatment capacity was made to <br /> <br /> <br />determine if, and when, future expansions would be required. The results <br /> <br /> <br />of this analysis are presented in Figure 1. Various alternatives for <br /> <br /> <br />increasing treatment capacity were developed and construction and <br /> <br />operational costs were estimated. The least cost treatment alternative <br /> <br /> <br />would include expansion of the City's existing plant to 46 mgd. <br /> <br />Evaluation of Alternatives - Based on the evaluation of the individual Plan <br /> <br /> <br />Elements, three additional alternatives were formulated for consideration. <br /> <br />The alternatives were formulated utilizing the following strategies: (1) <br /> <br /> <br />minimize cost, (2) improved management of the City's water supply through <br /> <br /> <br />diversification of raw water sources and increased storage of Transfer <br /> <br /> <br />Decree water, and (3) provide adequate emergency raw water storage supply. <br /> <br /> <br />Two alternatives were selected under these strategies: <br /> <br />1. Acquisition of additional CBT units and additional No.1 priority <br />direct-flow rights on the Big Thompson River (least-cost <br />alternative). <br /> <br />2. Acquisition of additional CBT units and increase the City's storage <br />capacity to provide an adequate emergency storage supply and <br />improve management of the City's Transfer Decree water. <br /> <br />-6- <br />