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<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 />I <br />I <br />I <br />I <br />I <br />I <br /> <br />o Severely deteriorated outlet works conduit and gate seat. <br /> <br />o Potential instability of the oversteepened downstream slope. <br /> <br />o Uncontrolled embankment and foundation seepage. <br /> <br />o Inadequate spillway capacity to route the PMF. <br /> <br />o Absence of outlet structure. <br /> <br />Considering the project deficiencies listed above, three alternative <br />rehabilitation designs were developed for Twin Lakes Dam to establish a \~ide <br />range of possible solutions in terms of construction cost, long-term operation <br />and maintenance, and technical confidence. Appraisal-level cost estimates, <br />i ncl udi ng a 25 percent conti ngency, were prepared for each al ternati ve; The <br />principal features of each rehabil itation and their respective costs are <br />summarized as follows: <br /> <br />vi <br />