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3) Positive. The costs incurred by the City will likely be less than the <br />costs for increasing the capacity of the reservoir (Alternative 4). <br />4) Positive. The raw water storage capacity will provide a more <br />reliable source of water for the City of Idaho Springs and its service area, and will provide the <br />City with additional revenue from water sales. <br />5) Negative. Future costs for increasing the storage capacity of the <br />Idaho Springs Reservoir, if desired by the City, will likely increase. <br />This alternative is feasible, and is considered the preferred alternative. <br />d. Alternative 4: Construct a more extensive dam at the existing site <br />1) Negative. The City will incur additional expenses for construction <br />of a more extensive dam at the existing site. <br />2) Positive. The safety of the Idaho Springs Reservoir Dam will meet <br />the requirements of the Office of the State Engineer, Dam Safety Branch. <br />3) Negative. The costs of the City's share for construction of a more <br />extensive dam will be beyond the capability of the City to finance with its own resources at this <br />time. <br />4) Positive. The raw water storage capacity will provide a more <br />reliable source of water for the City of Idaho Springs and its service area, and will provide the <br />City with additional revenue from water sales. <br />5) Positive. The City will not incur future costs for increasing the <br />storage capacity of the Idaho Springs Reservoir. <br />This alternative is not financially feasible at this time, but may continue as <br />a viable option for the future. <br />D. Description of the Selected Project <br />1. Alternative 3: Rehabilitate to restore the original storage capacity was the <br />preferred alternative. The project consists of scope elements to improve the safety of the dam <br />and to restore the storage capacity of the reservoir. This alternative has been developed with <br />preliminary engineering concepts to provide a representative basis for the estimated costs of the <br />necessary rehabilitation project. Other engineering concepts may be considered during execution <br />of the project, to result in equivalent rehabilitation. <br />5 <br />